3995 results about "Silicon based" patented technology

A lithium secondary battery includes a positive electrode, a negative electrode, a separator, and an electrolyte, wherein the positive electrode includes a positive electrode active material layer having a positive electrode active material containing an overlithiated manganese-based oxide represented by Formula 1 below, and the negative electrode includes a negative electrode active material layer having a silicon-based negative electrode active materialLiaNibCocMndMeO2  [Formula 1]wherein, M is at least one selected from the group consisting of Al, B, Co, W, Mg, V, Ti, Zn, Ga, In, Ru, Nb, Sn, Sr, and Zr, and 1≤a, 0≤b≤0.5, 0≤c≤0.1, 0.5≤d<1.0, and 0≤e≤0.2, and. Preferably, in the Formula 1, 1.1≤a≤1.5, 0.1≤b≤0.4, 0≤c≤0.05, 0.5≤d≤0.80, and 0≤e≤0.1.

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.

A lithium-ion battery having excellent high-temperature storage and high-temperature cycling performance. The lithium-ion battery comprises a positive electrode, a negative electrode, and a non-aqueous electrolyte solution. The negative electrode comprises a negative electrode material layer containing a silicon-based material. The non-aqueous electrolyte solution comprises a lithium salt, an organic solvent, and an additive, the organic solvent comprising fluoroethylene carbonate, and the additive comprising a silane compound containing at least one carbon-carbon double bond. The lithium-ion battery satisfies the following conditions: 5≤(S*R) / (F*T)≤35, 5≤f≤15, 1.4≤R≤1.68, 9≤S≤18, and 0.01≤T≤0.5. According to the lithium-ion battery, the mass percentage content of the organic solvent and the additive in the non-aqueous electrolyte solution are controlled, and the mass percentage content of elemental silicon in the negative electrode material layer is controlled and the compaction density of the negative electrode material layer is controlled to be within a certain range, such that the lithium-ion battery has excellent high-temperature storage performance and an excellent high-temperature cycle life, while also taking into account high energy density.

The invention provides a negative plate and a battery. The negative plate comprises a negative current collector and a coating, and the coating is divided into an inner layer and an outer layer; the inner layer is close to the surface of the negative current collector and the outer layer is away from the surface of the negative current collector; the first negative electrode active substance of the inner layer comprises a silicon-based negative electrode material, and the silicon-based negative electrode material comprises at least one of silicon oxide, silicon carbide, nano silicon and silicon alloy. The second negative electrode active material of the outer layer comprises a carbon negative electrode material, and the carbon negative electrode material comprises at least one of natural graphite, artificial graphite, hard carbon, soft carbon, mesocarbon microbeads and graphene. By adopting the specific double-layer active material layer structure, the performance of the negative electrode is effectively improved, and the energy density and the fast charging performance of the battery are improved. Meanwhile, due to the special multi-layer structural design, the volume expansion effect of the silicon-based negative electrode material can be effectively relieved, the structural stability of the negative electrode is optimized, the structural stability of the negative electrode can be kept for a long time in the charge-discharge cycle, and then the battery performance is optimized.

The invention relates to the technical field of lithium batteries, in particular to a composite binder aqueous solution, a silicon-based negative pole piece and a preparation method and application of the silicon-based negative pole piece. The preparation method of the composite binder aqueous solution comprises the following steps: dissolving a water-based polymer binder and a micromolecular physical crosslinking agent in water, adding pyrrole, stirring, adding an initiator, and mixing to obtain the composite binder aqueous solution. A small molecule physical cross-linking agent is introduced into the water-based polymer binder, and a large number of hydrogen bond binding sites are increased, so that the mechanical property of the binder is remarkably enhanced, and the machinability of the pole piece is further improved. Meanwhile, polypyrrole can be generated in the binder through in-situ polymerization, and the polypyrrole can be tightly coated on the surfaces of the silicon particles through strong interaction between the binder and the silicon particles to form a stable conductive network, so that the charge transfer capability of the electrode is remarkably improved. In addition, the composite binder is also beneficial to formation of a solid electrolyte layer rich in Li-N and participates in formation of a solid electrolyte interface layer, so that the lithium ion transmission capability of the composite binder is further improved.

The invention relates to the technical field of batteries, in particular to silicon carbon particles, a negative plate and a battery. The invention provides a silicon-carbon particle. The surface of the silicon-carbon particle is provided with a concave part; the number N of the concave parts on the surfaces of the silicon carbon particles is greater than or equal to 1; the diameter of the concave part is 0.05 [mu] m-5 [mu] m; the depth of the recessed part is 10 nm to 5 [mu] m. The sunken parts are arranged on the surfaces of the silicon-carbon particles, so that the cycle stability and the expansion performance of the silicon-based negative electrode material are improved.

The invention relates to a silicon-carbon composite material and a preparation method thereof, a negative pole piece, a secondary battery and a device, the silicon-carbon composite material comprises a carbon matrix with a pore structure and a silicon-based material distributed in the pore structure of the carbon matrix, and the silicon-carbon composite material contains phosphorus element. The silicon-based material in the silicon-carbon composite material improves the capacity of the carbon matrix, and the carbon matrix with the pore structure can be used as a buffer medium for volume expansion of the silicon-based material in the charging and discharging process while improving the conductivity of the silicon-based material, so that the problem that the volume of the secondary battery is increased due to silicon expansion is effectively relieved; and the phosphorus element doped in the skeleton of the carbon matrix is beneficial to improving the electronic conductivity of the material, so that the cycle performance of the battery is improved.

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 discloses a preparation method of a silicon-based quantum dot tracer. The silicon-based quantum dot tracer agent disclosed by the invention is prepared by taking 3-aminopropyltrimethoxysilane, sodium citrate, urea and deionized water as raw materials and adopting a hydrothermal synthesis method. The silicon-based quantum dot tracer agent is synthesized by using 3-aminopropyltrimethoxysilane as a silicon source and using the synergistic effect of double reducing agents of sodium citrate and urea, the synthesized silicon-based quantum dot tracer agent can overcome the influence of temperature and environment on the silicon-based quantum dot tracer agent, the fluorescence lifetime is prolonged, and the silicon-based quantum dot tracer agent has a relatively small particle size and can be used for preparing the quantum dot tracer agent. And inter-well tracer testing and single-well chemical testing technology research of an on-site oil field are facilitated.

The invention relates to the technical field of monolithic integration, in particular to a monolithic three-dimensional integration implementation method and device for a hybrid precision in-memory computing architecture, and the method comprises the steps: obtaining a silicon-based CMOS technology and a subsequent integration technology in a monolithic three-dimensional integration technology; manufacturing a control logic circuit on the computing architecture in the mixed precision memory by adopting a silicon-based CMOS (Complementary Metal Oxide Semiconductor) process; a plurality of functional layers are vertically stacked on a logic circuit by adopting a back-end integration process, communication among the functional layers is realized through interlayer dielectric via holes in the vertical direction, an analog in-memory array, a digital in-memory array and a cache are arranged on the functional layers, the analog in-memory array realizes matrix and vector multiplication with fixed weight, and the digital in-memory array realizes matrix and vector multiplication with fixed weight. And the array in the digital memory realizes matrix multiplication of refresh weight. Therefore, the problems that an in-memory computing architecture usually needs to occupy a relatively large part of chip area, the computing efficiency is relatively low and the like in related technologies are solved.

The invention relates to an in-situ cured silicon-based composite negative pole piece as well as a preparation method and application thereof. The silicon-based composite negative pole piece comprises a negative pole piece and a polymer electrolyte layer which is cured in situ and coats the surface of the negative pole piece; the polymer electrolyte layer is obtained through in-situ polymerization reaction of a precursor solution applied to the surface of the negative pole piece; the precursor solution contains a fluoroalkyl functional group; and the negative pole piece comprises a silicon-based material of which the surface is rich in hydroxyl. The composite negative pole piece disclosed by the invention not only can effectively limit the volume expansion of a silicon negative pole in a circulation process and reduce the phenomena of particle pulverization and interface separation, but also remarkably enhances the adhesive force among active substance particles, and ensures the structural integrity of the pole piece and the efficient transmission of ions and electrons. The silicon-based negative pole piece can form a stable solid-solid interface with the solid electrolyte through the polymer coating layer, so that the interface impedance is remarkably reduced, and the ion conduction efficiency is improved, thereby enhancing the cycling stability and safety performance of the battery while improving the energy density of the battery.

The invention discloses a silicon-based GaN-HEMT epitaxial structure and a manufacturing method thereof, and belongs to the technical field of semiconductor device design and manufacturing, the silicon-based GaN-HEMT epitaxial structure comprises a substrate, the substrate is a silicon substrate, a nucleating layer is epitaxially grown on the substrate, a defect filtering layer is epitaxially grown on the nucleating layer, and the defect filtering layer is arranged on the substrate. An impurity regulation and control layer is epitaxially grown on the defect filtering layer, a channel layer is epitaxially grown on the impurity regulation and control layer, a barrier layer is epitaxially grown on the channel layer, the defect filtering layer deposits a GaN layer on the nucleating layer, and the GaN layer structurally comprises a plurality of vertical insertion layers. According to the silicon-based GaN-HEMT epitaxial structure and the manufacturing method thereof, the silicon-based GaN-HEMT epitaxial structure comprises a nucleating layer, a defect filtering layer, an impurity regulation and control layer, a channel layer and a barrier layer, the electrical performance, reliability and consistency of a device are improved, defects can be effectively reduced, impurity distribution can be effectively controlled by optimizing materials and growth process parameters of all layers, and the performance of the device is improved. And the voltage-resistant electric leakage performance of the device is improved.

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 a silicon-based composite material, a preparation method thereof and a negative electrode. The silicon composite material comprises a porous matrix, silicon nanoparticles and heteroatoms, the porous matrix is provided with a three-dimensional cross pore channel with multistage pore diameters, the pore channel contains at least one silicon nanoparticle, the heteroatoms at least partially coat the surfaces of the silicon nanoparticles, and / or the heteroatoms are spaced among the silicon nanoparticles. According to the silicon-based composite material provided by the invention, the porous matrix is adopted as a substrate material to load the silicon nanoparticles and the heteroatoms doped in the silicon nanoparticles, and the silicon nanoparticles are separated and bound by doping the heteroatoms in the silicon nanoparticles, so that the size and distribution of the silicon material in pore channels are controlled; the silicon material is uniformly dispersed in the three-dimensional crossed pore channels of the porous matrix, so that the volume effect of silicon in the charging and discharging process is effectively relieved, the collapse of the composite material structure caused by the expansion of lithium-intercalated silicon is prevented, and the cycling stability of the electrode is improved.

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 invention provides a silicon-based composite negative electrode material which is of a core-shell structure and comprises a silicon core and a shell coating the surface of the silicon core, and the shell comprises a carbon layer and / or a metal oxide layer. The particle size of the silicon-based composite negative electrode material is 1-25nm, and the silicon-based composite negative electrode material has the advantages of small size, low expansion rate, excellent conductivity and ion conductivity, can solve the problem of volume expansion of the existing silicon-based material in the use process to a certain extent, and can better meet the requirement of the negative electrode material on electrochemical performance. The invention also provides a preparation method of the silicon-based composite negative electrode material. According to the preparation method, an organic silicon source is used for forming a silicon core, the stability of the material is improved by coating the silicon core with carbon and / or metal oxide, the preparation method is novel, and the preparation mode is simple.

The invention provides a silicon-based composite material, a negative electrode and a battery. The silicon-based composite material comprises silicon-carbon composite material particles and a slow-release substance, the silicon-carbon composite material particles comprise porous carbon and a silicon nanomaterial loaded in pores of the porous carbon, and the slow-release substance coats the outer surfaces of the silicon-carbon composite material particles to form a slow-release layer; or the slow-release substance has a three-dimensional network structure in a micron size, and the silicon-carbon composite material particles are dispersed in the three-dimensional network structure of the slow-release substance. The slow-release substance can slowly release lithium ions, so that the capacity retention ratio is maintained at a relatively high level, the cycle life of an electrode is greatly prolonged, and the silicon-based composite material can show excellent cycle performance when being applied to a lithium ion battery.

The invention provides a high-dynamics silicon-based negative electrode aqueous binder, a preparation method thereof and a battery. In the invention, firstly, an acrylic acid system is finely researched, and three different acrylic acid system monomers are selected; by optimizing the variety and proportion of the components, the balance between the mechanical strength and the flexibility is achieved, and meanwhile, the advantages of high viscosity and high stability are achieved; on the second aspect, the zwitterionic monomer with ion conduction performance and the phenol ionic liquid are also added, so that the ion transmission performance is improved; and the aqueous binder with high dynamics is obtained. The high-dynamics aqueous binder can effectively relieve the problem of volume expansion of a silicon-based negative electrode material in a battery; the swelling rate is reduced, high viscosity and flexibility are achieved at the same time, and the cycle stability of the material can be effectively improved.

A silicon-carbon composite material and a preparation method therefor, a negative electrode sheet, a secondary battery, and a device. The silicon-carbon composite material comprises a carbon matrix having a pore structure and a silicon-based material distributed in the pore structure of the carbon matrix, and the silicon-carbon composite material contains the element phosphorus. The silicon-based material in the silicon-carbon composite material increases the capacity of the carbon matrix, and the carbon matrix having the pore structure improves the conductivity of the silicon-based material, and can also be used as a buffer medium for volume expansion of the silicon-based material during charging and discharging, so that the problem of increase of the volume of a secondary battery due to silicon expansion is effectively relieved; in addition, the element phosphorus doped in the framework of the carbon matrix is beneficial to improving the electronic conductivity of the material, thus improving the cycle performance of the battery.

The invention provides a silicon-based negative pole piece and a lithium ion battery comprising the same, and relates to the technical field of lithium ion batteries. Comprising a negative electrode current collector, a second active material layer arranged on at least one surface of the negative electrode current collector, and a first active material layer arranged on the surface of the second active material layer. The design of the two active material layers ensures high energy density, and meanwhile, the formula design is optimized by combining the bonding characteristic of the interface layer, so that large internal stress is prevented from being generated in the charging and discharging process; the organic porous cross-linked polymer is applied to the negative pole piece, and the polymer is loose and porous and can be subjected to cross-linked polymerization in a high-temperature process, so that negative pole particles are tighter, expansion of a silicon negative pole in a charging and discharging process can be buffered, and stripping and cracking of the pole piece are prevented.

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 negative electrode material, a preparation method thereof and a lithium ion battery, the negative electrode material comprises a silicon-based material and a coating layer located on at least part of the surface of the silicon-based material, the silicon-based material comprises silicon oxide and lithium silicate, and the material of the coating layer comprises a carbon material; the method comprises the following steps: dissolving 20 mg of a negative electrode material in 10 ml of deionized water to form slurry, carrying out a Zeta potential test on the slurry by adopting a nanometer particle size and Zeta potential analyzer, in a Zeta potential test distribution diagram of the slurry, the intensity of a first characteristic peak of the slurry in a Zeta potential interval of-50 mV to-40 mV is I1, the intensity of a second characteristic peak of the slurry in a Zeta potential interval of-65 mV to-50 mV is I2, and the first characteristic peak and the second characteristic peak are shown in the specification. The intensity of the third characteristic peak in the Zeta potential interval of-35mV to-25mV is I3, and the relation among I1, I2 and I3 meets the conditions that I2 / I1 is greater than or equal to 0 and less than or equal to 2.0, and I3 / I3 is greater than or equal to 0 and less than or equal to 1.0. According to the negative electrode material, the volume expansion of the negative electrode material can be reduced, and the rate capability and the cycle performance of the negative electrode material are improved.

The invention relates to the field of lithium battery negative electrode materials, in particular to a silicon-based compound negative electrode material and a preparation method thereof.The negative electrode material comprises a compound of a silicon-based material and niobium-based composite oxide and metal nanoparticles loaded on the compound, the surface of the silicon-based material is coated with at least part of the niobium-based composite oxide, and the surface of the silicon-based material is coated with at least part of the niobium-based composite oxide. The negative electrode material is relatively good in conductivity, the conductivity and the lithium intercalation potential of the silicon-based composite negative electrode material are improved, the silicon-based material is prevented from generating side reaction with a solid electrolyte of a solid-state battery under low potential, meanwhile, the volume expansion of the silicon-based material in the charging and discharging process is relieved, and the comprehensive performance of the silicon-based solid-state battery is effectively improved.

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 provides a negative pole piece, a secondary battery and an electric device. The negative electrode piece comprises a negative electrode current collector and a negative electrode film layer formed on at least one surface of the negative electrode current collector, the negative electrode film layer is provided with a first surface far away from the negative electrode current collector and a second surface opposite to the first surface, and the thickness of the negative electrode film layer is marked as H; the area from the first surface of the negative electrode film layer to the thickness range of 0.3 H is marked as the first area of the negative electrode film layer, the area from the second surface of the negative electrode film layer to the thickness range of 0.3 H is marked as the second area of the negative electrode film layer, and the first area comprises a spherical or / and sphere-like first silicon-based material. The negative pole piece can reduce the expansion rate of the negative pole piece, and improve the cycling stability and storage performance of the battery.