3299 results about "Silicon based" patented technology

The invention discloses a method for improving the heat dissipation performance of an AlGaInP red light Micro LED chip. The method comprises the following steps: S1, preparing an epitaxial structure: processing a substrate and a buffer layer, growing an etching barrier layer and an ohmic contact layer, and carrying out stacking epitaxy on a functional layer; s2, patterning the silicon-based substrate: preparing a dielectric layer and a metal structure; s3, diamond ohmic contact layer integration: processing a p-type conductive diamond film layer, and carrying out metal reflection and bonding; s4, removing the substrate and forming an n-type structure: stripping the substrate to be in n-type contact; s5, back-end process integration: preparing an electrode and an optical structure; according to the invention, the heat dissipation performance of the chip is significantly improved; the series resistance is reduced by 30%-50%; the resistivity of the p / n type diamond ohmic contact layer is reduced by 1-2 orders of magnitude compared with ITO; gaAs material light absorption and metal shading are avoided, and the red light transmittance is improved from 75% to more than 90% by combining with the micro lens array; the method is compatible with existing MOCVD, CVD and photoetching processes, large-scale production of wafers of 2-12 inches can be achieved, and the manufacturing cost is reduced.

The invention discloses a light spot shaping device based on wave plate polarization conversion and a use method, and relates to the technical field of laser processing, the device divides random polarized light into S / P light through a first polarization beam splitter (PBS), converts the S light into P light through a first 1 / 2 wave plate, modulates the S light through a conventional silicon-based liquid crystal spatial light modulator (LCoS SLM), and converts the P light into the S light through a second 1 / 2 wave plate. And the beams are combined by the second PBS. The method comprises the steps of light splitting, polarization conversion, phase modulation, beam combining, beam expanding and focusing and the like. The double 1 / 2 wave plates are combined with the conventional PBS, the laser energy utilization rate is higher than 85%, commercial SLM equipment is adapted, the machining efficiency of the shaped annular light spots is remarkably improved compared with that of Gaussian beams, the method is suitable for laser welding and metal 3D printing, and the problems of energy waste and high cost are solved.

The invention belongs to the technical field of semiconductor devices, and particularly relates to an optical waveguide device based on a glass substrate, which comprises the glass substrate and a transition layer, an X silicon-based waveguide layer is arranged on the first surface of the transition layer, a heterogeneous material chip layer is integrated on the X silicon-based waveguide layer, the first surface of the X silicon-based waveguide layer is coated with a protective layer, and the protective layer is arranged on the first surface of the transition layer. The protective layer covers the glass substrate, the X silicon-based waveguide layer and the heterogeneous material chip layer at the same time; wherein the transition layer comprises an X element which is the same as that of the X silicon-based waveguide layer, through the above structure, the optical waveguide device with multiple layers of transition function areas is provided, the problems that the surface roughness of a large glass substrate is high, and the warping possibility is higher due to size effect amplification can be solved, and the optical waveguide device is suitable for large glass substrates. On the premise of fully utilizing the advantages of low cost and high performance of the glass substrate, the design of a large-size optical waveguide device for inhibiting packaging warping is realized.

The invention discloses a negative electrode interface modification material, a negative electrode plate, a positive electrode interface functional layer, a positive electrode plate, a solid-state battery and a power utilization device, and relates to the technical field of batteries, the negative electrode interface modification material comprises a first polymer matrix, a reinforcing filler, a conductive agent and a lithium salt, the modulus of the reinforcing filler is greater than 50 GPa. The tensile strength of the negative electrode interface modification material can be improved through the first polymer matrix, breakage of a negative electrode interface modification layer is reduced, interface impedance is reduced, meanwhile, the first polymer matrix can be matched with the expansion coefficient of a silicon-based material, and bulging of a negative electrode plate is reduced. The modulus of the reinforcing filler is greater than 50GPa, so that the modulus of the negative electrode interface modification layer can be improved, the expansion of the silicon-based active material is further inhibited, the conductive agent can relieve the problem that the flexible substrate interface of the copper foil and the negative electrode interface modification layer possibly causes unsmooth electron transmission, and the lithium salt can improve the ion conduction capability and reduce the interface impedance.

The embodiment of the invention relates to the field of energy storage, and provides a secondary battery and a preparation method thereof, an energy storage system and electric equipment. The negative electrode active material comprises a silicon-based material, honeycomb porous graphite and a polypyrrole layer, the surface of the honeycomb porous graphite is coated with the polypyrrole layer, the silicon-based material is embedded in pores of the honeycomb porous graphite, and the silicon-based material comprises silicon particles, a poly N-isopropylacrylamide layer and a disulfide bond-containing polyaniline layer. The poly (N-isopropylacrylamide) layer and the disulfide bond-containing polyaniline layer are coated on the surfaces of the silicon particles, the poly (N-isopropylacrylamide) layer is positioned between the silicon particles and the disulfide bond-containing polyaniline layer, and the honeycomb porous graphite comprises a graphite flake and a carbon layer which is positioned on the surface of the graphite flake and is of a honeycomb pore structure. The secondary battery formed by assembling the negative electrode active material disclosed by the invention has relatively high cycling stability, high temperature resistance, rate capability, gram volume and safety.

The invention provides an optical cross system based on silicon-based liquid crystal and a control method, and relates to the field of optical elements, and the optical cross system comprises an optical fiber array, a micro lens array, a collimating lens, a polarization conversion module, a dispersion element, a focus lens group and a liquid crystal spatial light modulator. Optical signals are coupled through the micro-lens array, a divergence angle is compressed, and parallel light beams are formed through the double-agglutination collimating lens; the polarization conversion module separates the light beam into P / S polarized light and unifies the polarization state; the dispersion element separates light beams according to wavelength space, and the focus lens group forms an elliptical Gaussian light spot on the liquid crystal spatial light modulator; the liquid crystal spatial light modulator divides a light spot into a plurality of independent control areas in the long-axis direction, and single-wavelength multi-port output, power proportion regulation and control and monitoring signal extraction are achieved by dynamically modulating the reflection phase of each area. The control method comprises the steps of optical path processing, regionalized phase modulation and real-time monitoring feedback. According to the invention, flexible routing, power balance and lossless monitoring of wavelength channels can be realized.

The invention belongs to the technical field of battery material preparation, and particularly relates to a coated negative electrode material as well as a preparation method and application thereof. The coated negative electrode material comprises a porous carbon skeleton and a carbon coating layer coating the porous carbon skeleton, the porous carbon skeleton is provided with a plurality of holes; a silicon layer and a functional layer are attached to the surfaces of part of the holes; the silicon layer comprises silicon, the functional layer comprises a functional material, and the functional material comprises lithium aluminum fluoride. The coated negative electrode material provided by the invention has the properties of low expansion, high lithium ion conduction, few byproducts and the like, and is suitable for a solid battery; the battery energy density is ensured, and the problems that an effective lithium ion path cannot be formed due to contact failure of an active substance caused by high volume expansion of a silicon-based material in the circulation process and contact failure of the active material and a solid electrolyte in a solid-state battery, and performance degradation is caused by negative electrode side polarization increase in the circulation process are solved.

The embodiment of the invention provides a battery. The battery comprises a winding type electrode body, the winding type electrode body comprises a negative plate, a diaphragm and a positive plate which are stacked and wound, and the tail end face of the diaphragm is flush with the tail end face of the negative plate. The negative plate comprises a negative current collector and a negative active material layer, and the negative active material layer at the tail part of the negative plate is flush with the tail part of the negative current collector along the first direction Z; the negative active material layer comprises a silicon-based material, the content of silicon in the negative active material layer is x, and x is larger than or equal to 1.5 wt% and smaller than or equal to 60 wt%. And the peel strength F1 of the diaphragm and the negative plate meets the condition that F1 is greater than or equal to 1N / m < 2 > and less than or equal to 30N / m < 2 >. The value of x and the value of F1 meet the condition that x / F1 is larger than or equal to 0.0005 and smaller than or equal to According to the winding type electrode body, the peeling strength of the diaphragm and the negative plate is controlled within a certain range and is matched with the content of the silicon-based material, namely the content of the silicon element, so that high-temperature shrinkage of the diaphragm can be limited, the contact short circuit of the negative plate and the positive plate is avoided, and the safety of the battery is improved.

The invention discloses a silicon / graphite / carbon-aluminum oxide composite negative electrode material and a green preparation method thereof, and belongs to the technical field of lithium ion batteries. Aiming at the problems of high volume expansion rate and poor cycling stability of a silicon-based negative electrode and high cost of a traditional process, the invention innovatively provides the following scheme: 1) waste photovoltaic silicon wafer ball-milling liquid and waste graphite are taken as core raw materials, and resource recycling is realized; (2) phenolic resin and chitosan are adopted as double carbon sources, a nitrogen-doped carbon layer (the nitrogen content is 3-5 wt.%) is formed through pH-induced self-assembly, and the conductivity and the Li < + > diffusion rate are synchronously improved; and 3) aluminum nitrate is introduced for pyrolysis to generate 2-5nm aluminum oxide for doping, so that the side reaction of the electrolyte is inhibited, and the volume expansion of silicon is relieved (the expansion rate is less than or equal to 120%). The preparation process comprises the steps of silicon / graphite dispersion, double-carbon-source compounding, ammonia water regulation and control precipitation and gradient calcination. Experiments show that the specific capacity of the optimized material under the current of 0.5 A / g reaches more than 800mAh / g, the 100-time cycle capacity retention ratio is more than 98%, the 1000-time cycle capacity retention ratio is more than 80%, the reversible specific capacity under the multiplying power of 3A / g is more than 550mAh / g, and the raw material cost is reduced by 40%. The invention has the advantages of high capacity, long service life, environmental protection and economy, and provides an innovative solution for the fields of power batteries and energy storage.

The invention relates to a uniformity detection method and device for a silicon-based material and a computer readable storage medium. Comprising the following steps: obtaining test luminescence brightness values corresponding to a plurality of test areas of a to-be-detected silicon-based material in a photoluminescence test process, wherein the plurality of test areas cover the whole surface area of the to-be-detected silicon-based material; according to a first standard curve of the silicon-based material to be detected, each test luminance value is converted into a test doping concentration, and the first standard curve represents a corresponding relation between the doping concentration and the luminance value; according to a membership relationship between the plurality of test doping concentrations and a preset doping concentration range, counting the total number of test qualified areas with qualified doping concentrations in the plurality of test areas; and detecting the doping concentration of the to-be-detected silicon-based material according to the total number of the test qualified areas and the total number of the test areas corresponding to the plurality of test areas. By adopting the method, the detection effect of detecting the uniformity of the silicon-based material is improved.

The invention provides a preparation method of a silicon monoxide negative electrode material and an external-pressure-free silicon-based solid-state battery, low-volume-expansion silicon monoxide is used as a negative electrode, a polymer solid-state electrolyte with high ionic conductivity is used as an electrolyte, and a positive electrode is combined to finally assemble a soft package battery or a cylindrical battery. And the silicon monoxide negative electrode has a relatively low volume expansion effect and excellent electrode structure stability, so that the cycle life and the stability of the battery are favorably improved. The polymer solid electrolyte shows excellent stress buffering capability in a solid electrolyte system due to low Young modulus and excellent flexibility, and can effectively adapt to volume change of a silicon-based negative electrode in an electrochemical cycle process. The technology can help the silicon-based solid-state battery get rid of dependence on external pressure, and the technology is relatively simple, high in applicability and wide in application value.

The invention discloses a multi-hydrogen bond enhanced fluorine-containing core-shell water-based binder as well as a preparation method and application thereof, and relates to the technical field of lithium ion silicon-based negative electrode binders. The preparation method comprises the following steps: dissolving methyl methacrylate, acrylonitrile and an emulsifier in water, carrying out a polymerization reaction to obtain a rigid core emulsion, adding acrylic acid long-chain ester, a fluorine-containing monomer and acrylamide, carrying out a mixing reaction to obtain a core-shell structure emulsion, mixing the core-shell structure emulsion with a sodium alginate solution, adding nano SiO2, and carrying out a polymerization reaction to obtain the high-temperature-resistant water-based acrylic emulsion. And after the reaction is finished, obtaining the multi-hydrogen bond enhanced fluorine-containing core-shell water-based adhesive. Through core-shell structure design and introduction of a multiple hydrogen bond network, the problem of bonding caused by volume expansion of the silicon negative electrode material in the charging and discharging process is successfully solved, the cycle life and stability of the battery are remarkably prolonged, meanwhile, the environment-friendly characteristic and the process simplicity are considered, and the preparation method is simple and convenient. And an efficient and sustainable development solution is provided for the field of lithium ion batteries.

The invention provides a large-view-field laser open-loop pointing method and device based on a liquid crystal on silicon (LCOS) array, and the method comprises the steps: constructing the LCOS array, and enabling the total executable light beam deflection range of the LCOS array to at least cover a target observation range; dividing the target observation range into a plurality of areas according to the executable light beam deflection range of the single LCOS; determining an initial angle of emergent light of each LCOS in the LCOS array; observing to obtain a space coordinate of the moving target, and determining a corresponding LCOS of the moving target in the LCOS array according to the space coordinate as a target LCOS; angle information of the moving target relative to the target LCOS is determined according to the space coordinates of the moving target, an initial angle of emergent light of the target LCOS is determined, and two-dimensional pointing angle information of the pointing light beam is determined; and modulating the target LCOS according to the two-dimensional pointing angle information, so that the pointing light beam points to the moving target after passing through the target LCOS.

The invention provides a secondary battery and a power utilization device, the secondary battery comprises a positive pole piece and a negative pole piece, a negative active layer of the negative pole piece comprises a silicon-based material, and a positive active layer of the positive pole piece comprises a lithium transition metal oxide and lithium-containing phosphate of an olivine structure, the lithium-containing phosphate comprises secondary particles I formed by primary particles I, pores exist among the primary particles I in the secondary particles I, and the secondary particles I are of a porous structure; and in the cross section of the secondary particles I, the area of the area filled with the primary particles I accounts for 60%-85%. The secondary battery prepared by the invention has both low-temperature performance and energy density.

The invention provides a silicon-based material and a preparation method thereof, a negative pole piece and a solid-state battery. The silicon-based material comprises an inner core and a surface coating layer, the inner core comprises a silicon-based negative electrode material, the surface coating layer is a carbon fluoride layer, the carbon fluoride layer internally comprises Li-M, LiF and LiX, M represents a metal element and is selected from at least one of Ag, Mg, Zn and Al, and X represents a non-metal element and is selected from at least one of N, S and P. The silicon-based negative electrode material is used as a core, the surface of the silicon-based negative electrode material is coated with the carbon fluoride layer, and the Li-M alloy / LiF / LiX composite lithium compound is introduced into the carbon fluoride layer, so that triple effects of ion-electron double-conduction network construction, interface chemical stabilization and mechanical buffer enhancement are achieved; and the chemical stability of an interface between the silicon negative electrode and sulfide solid electrolyte is improved while the rate capability of the negative electrode is improved and the expansion and shrinkage of the silicon negative electrode are relieved, and the cycling stability is improved.

The invention belongs to the technical field of treatment of special gas packaging gas cylinders, and particularly relates to a treatment method and application of a mixed gas packaging gas cylinder, and the treatment method comprises the following steps: S1, filling a packaging gas cylinder with monosilane mixed gas, maintaining the pressure, and then carrying out vacuum-pumping treatment; s2, filling the dry compressed air, maintaining the pressure, then vacuumizing, and repeatedly filling the dry compressed air, maintaining the pressure and vacuumizing for 2-3 times; and S3, nitrogen is refilled, then vacuumizing treatment is carried out, and nitrogen filling and vacuumizing are repeatedly carried out 5-8 times. S4, target mixed gas with the pressure of 50 psig-150 psig and the concentration of 50-100 times is filled and stored for 24-168 h, then the target mixed gas in a mixed gas packaging gas cylinder is analyzed, if the target mixed gas is smaller than or equal to three times of the index before filling, it is judged that treatment is qualified, and otherwise the steps S1-S3 are repeated. The interior of the gas cylinder is pretreated, a silicon-based isolation layer is formed on the inner wall of the gas cylinder, and the corrosion resistance of the interior of the gas cylinder is improved.

A lithium secondary battery according to an embodiment includes an electrode assembly 1 in which a first electrode group 2 including at least one first unit cell 10; and a second electrode group 4 including at least one second unit cell 30 are alternately assembled. The first unit cell 10 includes a first-first anode mixture layer 111a on the first anode current collector 110; and a first-second anode mixture layer 111b on the first-first anode mixture layer. The second unit cell 30 includes a second-first anode mixture layer 311a on the second anode current collector 310; and a second-second anode mixture layer 311b on the second-first anode mixture layer. The first-first anode mixture layer 111a includes a carbon-based active material, and each of the first-second anode mixture layer 111b, the second-first anode mixture layer 311a and the second-second anode mixture layer 311b includes a silicon-based active material.

The invention relates to the technical field of microelectronics, semiconductors and communication, and discloses a radio frequency switch chip, and the circuit structure of the radio frequency switch chip comprises a transformer type differential inductor T-L1, a transformer type differential inductor T-L2, a capacitor C1, an NMOS transistor M1, an NMOS transistor M2, a gate resistor RG1, and a gate resistor RG2. The radio frequency switch chip provided by the invention adopts a differential structure, so that the parasitic inductance effect of a grounding key and a wire during packaging and testing can be eliminated, and the insertion loss and the isolation performance are improved; compared with a single-end port, the lower impedance of the differential port is more beneficial to improving the power capacity of the switch; the differential structure allows the transformer type differential inductor to use differential signal characteristics, the equivalent quality factor of the inductor is improved, and the circuit performance is improved; the differential structure can improve the linearity of the circuit, especially the second-order intermodulation effect; the differential structure can be compatible with a modern silicon-based CMOS radio frequency system, and an additional balun is not needed for signal conversion.

The invention belongs to the technical field of secondary batteries, and discloses a polyurethane acrylate emulsion and a secondary battery. The polyurethane acrylate emulsion comprises water and a polymer dispersed in the water; the polymer comprises a core and a shell, the shell covers the core, the core comprises water, and the shell comprises urethane acrylate; the polyurethane acrylate comprises a polyurethane unit and a polyacrylate unit, and the polyacrylate unit comprises an organic silicon chain segment; on the basis of the mass of the polyurethane acrylate, the mass content of the organic silicon chain segment is 0.1%-10%. The polyurethane acrylate emulsion provided by the invention has the characteristics of high bonding strength, electrolyte corrosion resistance and good dispersity to a conductive agent, and when the polyurethane acrylate emulsion is used as a silicon-based negative electrode binder, the polyurethane acrylate emulsion can effectively cope with large volume change of a silicon-based material, the problem of interface failure of a silicon-based negative electrode is solved, and the cycle performance and the dynamic performance of a battery are improved.

The invention relates to the technical field of lithium batteries, in particular to a preparation method of a high-temperature-resistant lithium battery cell. The invention discloses a preparation method of a high-temperature-resistant lithium battery cell, which is characterized in that through full-chain synergy of modification of positive and negative electrode materials, electrolyte optimization and structural design, a positive electrode adopts nickel cobalt lithium aluminate with a core-shell structure, and a metal organic framework coordination layer, polyaniline-polyacrylic acid multilayer coating and foam aluminum foil 3D printing coating are combined. The negative electrode takes silicon-carbon core-shell particles as a substrate, and breaks through the expansion bottleneck of a silicon-based negative electrode through metal organic framework confinement coating, polyaniline-polyacrylic acid cross-linked network modification and foam copper foil functionalization. The electrolyte adopts a film-forming additive and lithium difluorophosphate to form a stable SEI film, and internal resistance increase at high temperature is inhibited. The aramid fiber coating diaphragm and the aluminum alloy shell are matched, so that the thermal stability of the battery cell is remarkably improved, the battery cell can stably work in a wide temperature range environment, high energy density and long cycle life are comprehensively realized, and key support is provided for a long-endurance and high-safety battery.

The invention discloses a composite solid electrolyte layer, a preparation method and application, the composite solid electrolyte layer comprises a porous membrane laminated on a negative pole piece, and pores in the porous membrane and gaps between the porous membrane and the negative pole piece are filled with in-situ generated polymers. Inorganic solid electrolyte is also dispersed in the porous membrane, and lithium salt is dispersed in the polymer and the porous membrane. The composite solid electrolyte layer is obtained through in-situ polymerization of a polymer in pores in the porous membrane and gaps between the porous membrane and the negative electrode plate, and a novel interface structure with the electrode-electrolyte integration characteristic is constructed. By adopting a collaborative optimization strategy of a polymer matrix and inorganic filler double-crosslinking network system and an interface stable layer, the volume effect problem of a silicon-based negative electrode, the electrolyte interface impedance problem and the battery safety problem can be solved at the same time, so that the cycling stability and the rate capability of the lithium ion battery are remarkably improved.

The utility model discloses an electric igniter for continuously purifying raw gas of a test furnace, which is characterized in that an electric heating wire is pre-embedded in a silicon-based ceramic heating body of the electric igniter and is formed by hot pressing and sintering, a power supply module provides a working power supply for the electric heating wire, a temperature control chip detects the temperature of the silicon-based ceramic heating body in real time, and the output power of the electric heating wire is controlled through a power regulator. Setting a heating curve in the test furnace according to a production process, communicating the temperature control chip with a PLC (Programmable Logic Controller) of the test furnace, and reading the set heating curve of the test furnace; and controlling the silicon-based ceramic heating body to output different powers through a power regulator according to each stage of the heating curve, so as to ensure that the raw gas generated in each stage is ignited and purified. According to the electric igniter and the control method, the defects of traditional raw gas combustion treatment are overcome, external combustible gas does not need to be introduced, reliable combustion of the raw gas is ensured, the electric igniter can work in a high-temperature and high-corrosion smoke environment for a long time, the service life is prolonged, and the purpose of safely discharging the raw gas is achieved.

The invention relates to the technical field of lithium ion batteries, and discloses a preparation method of silicon-carbon negative electrode slurry, the silicon-carbon negative electrode slurry and a lithium ion battery. The silicon-carbon negative electrode slurry comprises the following components: a silicon-based material, a graphite material, a carbon black conductive agent, a single-walled carbon nanotube conductive slurry, a sodium carboxymethyl cellulose binder, a polyacrylic acid binder, a styrene butadiene rubber binder, N-methyl pyrrolidone and deionized water. The silicon-carbon negative electrode slurry is prepared by adopting a dry process and a method of adding the binder step by step, so that the uniformity of the silicon-carbon negative electrode slurry is ensured, the expansion of the silicon-carbon negative electrode material is inhibited, and the cycle performance of the prepared lithium ion battery is finally improved. The silicon-based negative electrode paste has the following beneficial effects that the prepared silicon-based negative electrode paste is good in stability, and the single-walled carbon nanotube conductive paste, the sodium carboxymethyl cellulose binder, the polyacrylic acid binder and the styrene butadiene rubber binder form a multi-stage synergistic effect through complementary conductive, binding, dispersing and mechanical properties.

The invention discloses a silicon-based composite material, a negative pole piece and a secondary battery, and belongs to the technical field of batteries. According to the product, a core-shell structure is constructed by taking nano-sized silicon-carbon composite particles as an inner core and taking a derivative carbon nanosheet of an MOF material ZIF-90 with a nanosheet-shaped zinc imidazole skeleton as a shell, so that a good silicon element volume effect limiting effect can be realized, and the size stability of the product serving as a negative pole piece active material is guaranteed; meanwhile, the conductivity is high, the structural strength is good, high compaction density can be achieved, and a further prepared secondary battery can also have high rate performance while achieving high capacity and excellent cycle performance.

The application belongs to the technical field of batteries, and particularly relates to a silicon-carbon negative electrode material and a preparation method and application thereof. The method comprises the following steps: preparing a porous carbon fiber membrane loaded with a metal catalyst; preparing a dispersion solution of a nano-silicon-based material, and distributing the nano-silicon-based material into the porous carbon fiber membrane to obtain a composite porous carbon fiber membrane; and performing thermal chemical vapor deposition on the composite porous carbon fiber membrane in an inert atmosphere containing a carbon source, growing carbon nanofibers and vertical graphene on the surface of the composite porous carbon fiber membrane, and obtaining a silicon-carbon negative electrode material. Through a synthesis route of thermal chemical vapor deposition (T-CVD), the synthesis process is optimized, and a multi-level three-dimensional network structure of carbon nanofibers and vertical graphene is constructed to enhance the electrical conductivity of the silicon-carbon negative electrode material, accelerate carrier transmission, improve the interface contact performance between the silicon-based material and the carbon material, improve the loading capacity of the nano-silicon-based material, inhibit the volume expansion of the nano-silicon-based material, and improve the structure and cycle stability of the nano-silicon-based material.

The invention provides a control system for locking a bias working point of a silicon-based chip of an MZM structure, which comprises the silicon-based chip, two sampling circuits, an MCU control unit, a multi-channel operational amplifier and an upper computer, and is characterized in that the silicon-based chip comprises an MZM modulator, the MZM modulator comprises a modulation arm A, a modulation arm B, a heater, an A-arm photodiode and a B-arm photodiode, a sampling circuit collects voltage and current signals on a driving arm on the MZM modulator for feedback, the voltage and current signals are transmitted to a peripheral MCU control unit and uploaded to an upper computer, and the MCU control unit regulates and controls the voltage or current of a modulation arm A through a multi-channel operational amplifier. The invention further provides a control method of the control system for locking the bias working point of the silicon-based chip of the MZM structure. The occupied space in the high-speed optical module is small, so that the layout of other electric chips is facilitated, and higher circuit reliability is realized; a brand-new and accurate control method is designed.

The present application relates to the field of materials, and more specifically, to a silicon negative electrode material, a battery negative electrode sheet, and a lithium-ion battery. The silicon negative electrode material comprises a nano-sheet silicon-based material and a carbon coating layer, with a metal layer or metal particles between the carbon coating layer and the silicon-based material. The surface of the silicon negative electrode material of the present application has a carbon coating layer, which can effectively prevent the direct contact between the nano-sheet silicon-based material and the electrolyte, and the SEI film formed on the coating layer is thin and stable. In addition, there is a metal layer or metal particles between the nano-sheet silicon-based material and the carbon coating layer, and the good electrical conductivity of the metal can compensate for the poor electrical conductivity of silicon.

A method and an apparatus for conformal boron doping of a three-dimensional structure. The method comprises: removing an oxide layer from a surface of a silicon-based three-dimensional (3D) substrate; forming, after removing the oxide layer, a first group of stacked films on a surface of the silicon-based three-dimensional substrate; forming a second group of stacked films on a surface of the first group of stacked films away from the silicon-based 3D substrate; depositing an aluminum oxide passivation layer on a surface of the second group of stacked films away from the first group of stacked films; and boron-doping the silicon-based 3D substrate through laser annealing or rapid thermal annealing, where the laser annealing or the rapid thermal annealing drives boron dopants, which comprises boron oxide, into the silicon-based 3D substrate via an auxiliary layer.

The invention discloses an adhesive composition-performance coupling prediction method based on a graph neural network. The method comprises the following steps: S1, collecting an adhesive sample and an adhesive performance sample for a silicon-based negative electrode of a lithium ion battery; s2, converting the preprocessed binder composition sample into a graph data structure; s3, constructing a graph neural network model based on the graph data structure, and outputting a performance prediction result corresponding to the binder performance sample; s4, performing global parameter optimization on the graph neural network model by using a grey wolf optimization algorithm, wherein the grey wolf optimization algorithm serves as a target loss function according to an error between a prediction result output by the graph neural network model and an actual binder performance sample in an iteration process; and S5, applying the optimized graph neural network model to new binder composition graph data, and generating a corresponding performance prediction result. According to the method, the perception capability of the model on the binder performance change trend can be remarkably improved, so that the model not only learns the individual influence of each component, but also can understand the combination relationship and the coupling effect of the components.

The application discloses a dynamic roller pressing forming device for a gradient-pore diaphragm for a silicon-based negative electrode, comprising a modular coating unit, a multi-shaft roller pressing machine group and a partitioned annealing cavity arranged in sequence, the modular coating unit comprises a slit coating mechanism, a spray coating mechanism and a micro-gravure coating mechanism arranged in sequence, the multi-shaft roller pressing machine group comprises a main pressing roller and a supporting roller matched with the main pressing roller, and a dynamic pressure feedback system is arranged on the main pressing roller; and the application further discloses a method for preparing a gradient-pore high-molecular diaphragm by using the forming device. The device is provided with the main pressing roller of the multi-shaft roller pressing machine group and the partitioned annealing cavity, and the dynamic pressure feedback system is arranged on the main pressing roller, so that the accurate matching between the pore structure and the expansion behavior of the silicon-based negative electrode is realized, the stress buffering capacity and the ion transmission efficiency of the diaphragm are improved, and the device is suitable for the technical field of lithium ion battery materials.