106 results about "Lithium intercalation" patented technology

The invention discloses a high-cycle-performance aqueous battery, which comprises an aqueous electrolyte, a negative electrode, a first positive electrode and a second positive electrode, wherein the first positive electrode and the second positive electrode are positioned on two sides of the negative electrode, and a first diaphragm and a second diaphragm are respectively arranged between the first positive electrode and the negative electrode and between the second positive electrode and the negative electrode; the battery is provided with an electromagnetic valve, the electromagnetic valve is electrically connected with the first positive electrode and the second positive electrode to control switching of the positive electrodes in the charging and discharging loop, and every time discharging and charging circulation are completed, the electromagnetic valve switches the electrode connection relation, and the first positive electrode and the second positive electrode are alternately connected into the charging and discharging loop. Switching of the two positive electrodes in the aqueous battery is accurately controlled through the electromagnetic valve, a positive-negative battery structure is formed in real time, the double positive electrodes alternately perform lithium removal-lithium intercalation reaction, excessive Li intercalation or insufficient positive electrode reduction caused by long-term charging and discharging of a single positive electrode is avoided, the structural stability of the positive electrode material is improved, and the service life of the battery is prolonged. The cycle life and the electrochemical performance stability of the aqueous battery are obviously improved.

The embodiment of the invention discloses a negative electrode and a preparation method thereof and a battery, the negative electrode comprises a silica material, a first material and a binder, the first material comprises MXene of a lithium intercalation layer and an elastic polymer electrolyte coating layer coating the surface of the MXene of the lithium intercalation layer, and a three-dimensional elastic network with ionic conductivity is constructed by adhering a binder to the periphery of the silica material. Under the combined action of the network and MXene particles of a rigid lithium intercalation dispersed in the network, the huge volume expansion of the silica material in the circulation process can be effectively bound and buffered, and the integrity and stability of the electrode structure are maintained. Meanwhile, the elastic polymer electrolyte is used as an ionic conductor, so that an additional path is provided for storage and transmission of lithium ions in lithium intercalation MXene; and meanwhile, the MXene of the lithium intercalation layer can also be used as a lithium supplementing material, so that the first coulombic efficiency of the battery is effectively improved.

The invention relates to a method for synergistically improving electrochemical performance of a lithium nickelate positive electrode material by virtue of a plurality of trace elements, which is characterized in that a particle body crystal structure of the material is strengthened by virtue of a synergistic effect of the trace elements, and the surface is subjected to in-situ conversion to form a coherent rock salt phase surface layer, so that Li / Ni cation mixing and surface residual alkali amount are reduced, and the electrochemical performance of the lithium nickelate positive electrode material is improved. Structural distortion and surface harmful side reactions in the lithium intercalation and deintercalation process are effectively inhibited, so that the electrochemical performance such as the specific capacity, the cycle life, the rate and the high-temperature cycle stability of the material is improved. The stoichiometric formula of the lithium nickelate positive electrode material is Li < 1.05-x > Ni < 1-y-z > A < x > B < y > C < z > O < 2 >, the specific capacity can reach 250 mAh / g or above, the 10 C specific capacity reaches 158 mAh / g or above, the capacity retention ratio is 80.34% after charging and discharging circulation for 500 weeks at the normal temperature under the current rate of 1 C, and the capacity retention ratio is 62.83% after charging and discharging circulation for 500 weeks at the temperature of 55 DEG C. The positive electrode material has the characteristics of no cobalt or manganese, high specific capacity, long cycle life, good rate and high-temperature performance and the like, and has a wide application prospect in high-specific-energy lithium ion batteries in the fields of unmanned aerial vehicles, artificial intelligence, electric automobiles and the like.

An electrochemical cell has a cathode active material selected from mixed lithium transition metal oxides containing Mn and at least one second transition metal; lithium intercalating mixed oxides containing Ni, Al and at least one second transition metal; and lithium metal phosphates, wherein the outer surface of the particulate cathode active material is at least partially coated with an oxide selected from transition metal oxides, lanthanide oxides, and oxides of metals and half metals of groups 2, 13, and 14 of the periodic system; and an electrolyte composition containing at least one silyl ester phosphonate of formula (I)and at least one silyl ester phosphonate of formula (II)

The invention discloses an in-situ characterization method of graphite electrode microstructure stress in an electrochemical process. The in-situ characterization method comprises the following steps: measuring microstructure three-dimensional strain evolution information in situ by adopting a spectrum comprehensive technology; calculating modulus evolution of the typical lithium intercalation structure by adopting DFT (Discrete Fourier Transform); and establishing an electrochemical induced stress characterization model based on microstructure strain and modulus. The invention provides a novel electrochemical induced microstructure stress characterization method based on experiments, simulation and modeling, key factors such as microstructure anisotropy, strain types, modulus nonlinearity and the like are considered, the accuracy of mechanical description is ensured, and comprehensive characterization of microstructural mechanics is realized. Based on the provided microstructure stress characterization method, the important function of graphite electrode microstructural mechanics in the lithium storage process can be analyzed, meanwhile, the method can be further popularized to other layered electrode materials and sodium and potassium storage systems, and an important means is provided for mechanical-electrochemical coupling analysis.

This invention relates to a method for iodine-induced lithium intercalation and exfoliation of two-dimensional materials, comprising the following steps: uniformly mixing a target bulk layered material with an inorganic salt to obtain mixture A; the inorganic salt contains lithium iodide; heating mixture A to 280–400°C under a vacuum environment or protective atmosphere, while simultaneously applying ultraviolet light irradiation, and obtaining mixture B through solid-state lithiation treatment; dispersing mixture B in deionized water, and obtaining the two-dimensional material through hydrolysis exfoliation, separation, washing, and drying. This invention uses an inorganic salt containing lithium iodide as the intercalation medium, and through the synergistic excitation of a light field and a thermal field, induces the oxidative decomposition of halide ions and the release of electrons, driving alkali metal ions to intercalate into the interlayer gaps of the bulk layered material to achieve in-situ solid-state intercalation. Then, through hydrolysis exfoliation, an ultrathin two-dimensional material with a large lateral dimension is obtained. The process is safe, has high intercalation efficiency, and good versatility.

The application relates to the technical field of preparation of lithium ion battery negative electrode materials, in particular to a graphene-coated silicon-carbon composite material and a preparation method and application thereof. The preparation method of the graphene-coated silicon-carbon composite material comprises the following steps: microwave-assisted sand milling mixing of a nano-silicon dispersion liquid, a pitch dispersion liquid, a three-block copolymer Pluronic F127 and zirconium oxide beads to obtain a mixed solution of pitch silicon particles; microwave-assisted sand milling dispersion of a sulfonated graphene dispersion liquid into the mixed solution of pitch silicon particles to obtain a slurry of sulfonated graphene-coated pitch silicon particles; and drying and heat treatment of the slurry of sulfonated graphene-coated pitch silicon particles to obtain the graphene-coated silicon-carbon composite material. The graphene prepared by the preparation method effectively buffers the volume effect generated in the lithium intercalation and deintercalation process of the silicon-based negative electrode material, so that the electrochemical performance of the material is improved.

This application provides an electrochemical device comprising a negative electrode and an electrolyte. The negative electrode includes a negative current collector and a negative active material layer disposed on the negative current collector. The negative active material layer comprises a negative active material. The negative active material contains a silicon-based active material, and the mass percentage of the silicon-based active material in the negative active material is X%. The electrolyte contains metal ions, and based on the mass of the electrolyte, the mass percentage of the metal ions is A ppm, where X and A satisfy the relationship: 0 < X / A ≤ 8. During the charging process of the electrochemical device, the metal ions can undergo a reduction reaction at the negative electrode and form a stable Si-metal binary alloy phase or Si-O-metal ternary alloy phase with the silicon element in the silicon-based active material. This effectively suppresses the lithium intercalation expansion of the silicon-based active material, reduces electrolyte consumption, and effectively improves the cycle performance of the electrochemical device.

The invention relates to the technical field of battery materials, in particular to a silicon-carbon negative electrode material and a preparation method and application thereof. Through a three-step preparation process, firstly, inner carbon coating is formed on the surface of nano silicon through first chemical vapor deposition, so that volume expansion of silicon in a lithium intercalation process can be relieved preliminarily, and a good interface is provided for subsequent compounding. Then a water-soluble template agent and an elastic polymer precursor are introduced, after spray drying and carbonization, a carbon intermediate layer with elastic and porous characteristics is formed, and the structure can effectively adapt to and buffer repeated volume change of silicon in circulation. And finally, a compact and continuous outer carbon shell is formed through second chemical vapor deposition, so that the structural integrity, the conductivity and the interface stability of the material are further enhanced. The multistage composite system synergistically inhibits the volume effect of silicon from different scales, and effectively delays material pulverization, interface stripping and continuous fracture of a solid electrolyte interface film, thereby improving the structural durability and cycle stability of the material.

This invention relates to a silicon-based anode material with a self-healing layer, its preparation method, and its application, belonging to the field of lithium-ion battery technology. By mixing and drying silicon nanoparticles, a carbon source, and a gallium source in the liquid phase, followed by a one-step high-temperature annealing, a hierarchical structure of "core-buffered intermediate layer-shell" is obtained. This structure consists of a silicon nanoparticle core, a gallium oxide intermediate layer covering the core surface, and a carbon shell layer covering the intermediate layer. The in-situ transformation and alloying reaction of the gallium oxide intermediate layer during lithium intercalation buffers the expansion stress of the internal silicon core, fundamentally preventing the outermost carbon shell from cracking. Simultaneously, the liquid metal network generated in the intermediate layer bridges the broken silicon particles, achieving self-healing of the electrode, thereby achieving high specific capacity, long cycle life, and low macroscopic expansion rate.

This invention discloses a method for preparing titanium-doped carbon fiber anode material. The method involves intercalating graphite and then combining it with carbon fiber, followed by sequential carbon coating, carbonization, and pulverization to obtain the anode material. Physical adsorption is used to combine the intercalated graphite with carbon fiber, improving conductivity and reducing the amount of carbon fiber used, thus lowering costs. Furthermore, the very small particle size of graphite allows it to fill defects in the carbon fiber through adsorption, providing volume support during charge and discharge, dispersing stress generated during carbon fiber deformation, and further limiting the expansion and contraction of the core structure by forming a core-shell structure, thereby improving cycle performance. Additionally, titanium dioxide is uniformly dispersed in the coating solution, resulting in a uniform distribution of titanium dioxide particles on the shell structure. Titanium dioxide has a large interlayer spacing structure, which can serve as a lithium-ion transport interface, improving the initial coulombic efficiency of the material and increasing the lithium intercalation capacity of the shell material, thereby improving the specific capacity and energy density of the anode.

The application belongs to the field of electrochemistry, and particularly relates to a silicon-carbon composite material and a preparation method and application thereof. The silicon-carbon composite material comprises a carbon layer skeleton and nano-silicon, the carbon layer skeleton comprises a flexible inner carbon layer and a rigid outer carbon layer, the flexible inner carbon layer surrounds a gap, the nano-silicon is filled between the flexible inner carbon layer and the rigid outer carbon layer, and the nitrogen element content of the carbon layer skeleton is 2at% to 10at%. The silicon-carbon composite material obtained by the application has a low electrode sheet expansion rate, the double-carbon-layer skeleton of the silicon-carbon can induce the nano-silicon particles to expand to the internal gap, and provide buffering and confinement for lithium intercalation expansion. Meanwhile, the nitrogen element contained in the carbon layer can increase the electronic conductivity and the transmission speed of lithium ions in the carbon layer.

The application relates to the technical field of batteries, in particular to a silicon-carbon composite material and application thereof. The silicon-carbon composite material comprises porous carbon material and nano-silicon particles in the pores of the porous carbon material; the ratio of the intensity value of the lithium intercalation peak at 0.30-0.45 V to the strongest peak value in 0-0.25 V in the dQ / dV curve of the first lithium intercalation of the silicon-carbon composite material is less than 0.05. The silicon-carbon composite material has high compressive strength, high charge-discharge capacity and good cycle stability.

This invention relates to the field of graphite anode material technology, specifically disclosing a surface-coated natural graphite, its preparation method, and its applications. The surface-coated natural graphite comprises a negatively charged natural spherical graphite core, which is coated with a positively charged micelle solution. A negatively charged MOF is grown on the positively charged micelles through electrostatic adsorption and crystal orientation induction. After curing and drying, a hard carbon source is coated on top, and high-temperature calcination is performed to prepare a natural spherical graphite core, an onion-like carbon framework and a nanocrystalline intercalation structure, an electrostatically coupled intermediate layer, and a hard carbon shell. The graphite anode material of this invention achieves optimized ion diffusion channels, optimized conductive networks, and expanded lithium intercalation sites. This structure significantly improves cycle life and specific capacitance, making it suitable for long-life lithium batteries.

The application discloses a kind of fast charging type lithium battery and preparation method thereof, belong to lithium battery technical field.The fast charging type lithium battery, including positive pole piece, diaphragm, negative pole piece and electrolyte, the negative pole active material of negative pole piece includes 6~8 parts of N-P doped hollow silicon-carbon particles, 3~5 parts of double network binder and 2~4 parts of conductive graphite;Double network binder is polyacrylic acid-polyvinyl alcohol double network binder containing ether oxygen chain.The hollow cavity in N-P doped hollow silicon-carbon particles in negative pole active material provides buffer space for the huge volume expansion of silicon in lithium intercalation process, and shortens lithium ion diffusion path, is conducive to realizing fast ion transport.N and P doping improves the electronic conductivity of the material, reduces the charge transfer impedance, improves the lithium ion migration ability, thereby reducing the generation and accumulation of heat.Double network binder provides an additional heat conduction path, which can achieve continuous charging rate at high rate.

This invention belongs to the field of fungal keratitis treatment technology, and discloses a MoSe2-PEI quantum dot, an antifungal eye drop, its preparation method, and its application. The MoSe2-PEI quantum dot is a PEI-modified MoSe2 quantum dot. Preparation steps: (1) Prepare lithium-modified MoSe2 using lithium intercalation-assisted liquid phase exfoliation technology; (2) Disperse the lithium-modified MoSe2 in water by ultrasonication, centrifuge, collect the supernatant, and ultrafilter to obtain an aqueous solution of MoSe2 quantum dots; (3) Add PEI to the aqueous solution of MoSe2 quantum dots under stirring conditions, then sonicate, stir, and finally centrifuge and ultrafilter sequentially to obtain an aqueous solution of MoSe2-PEI quantum dots. An application of the MoSe2-PEI quantum dot in the preparation of a drug for treating fungal keratitis. The MoSe2-PEI quantum dot of this invention can effectively kill the main pathogens causing fungal keratitis.

The invention relates to the technical field of batteries, in particular to a niobium-based negative electrode material, a preparation method thereof, a negative electrode and a battery. The preparation method of the niobium-based negative electrode material comprises the following steps: S1, dispersing TiO2, Nb2O5, B2O3 and Tb4O7 in an ethanol solution; transferring into a high-energy ball mill for further ball-milling and mixing; drying to obtain a precursor; and calcining the prepared precursor at high temperature to obtain the niobium-based negative electrode material. According to the niobium-based negative electrode material, boron and terbium are adopted for modification, heteroatoms are introduced for bulk phase doping, the crystal structure of the material can be changed, the electronic conductivity of the material is improved through the electronic structure and energy band hybridization of the heteroatoms, and the material is high in lithium intercalation potential, excellent in fast charging performance and free of the risk of lithium precipitation.

This invention discloses a low-expansion, high-efficiency silicon-carbon anode material and its preparation method, belonging to the field of lithium-ion battery technology. The material uses a specific porous carbon framework without >4nm pores and with a mesopore volume ratio of 10-30%. A high-concentration silane vapor deposition process is used to directionally distribute nano-silicon on the shallow surface of the framework, achieving a silicon filling rate of 50-80%. Finally, a vapor-phase carbon source is used for surface sealing and coating. This invention utilizes the synergistic effect of high-concentration deposition kinetics and a specific micro-mesoporous structure to retain deep micropores as rigid buffer cavities, significantly suppressing macroscopic volume expansion during silicon lithium intercalation while ensuring high silicon loading. Experimental results show that the material has an extremely low specific surface area and excellent structural stability, with an initial coulombic efficiency ≥92% and a fully charged electrode expansion rate as low as 51-82%, solving the common problems of large expansion and low initial efficiency in porous silicon-carbon anodes.

This invention discloses a carbon-sulfur battery and its preparation method. A sulfur-carbon compound containing C-S and S-S (sulfur atom number ≤ 4) structural units is used as the positive electrode active material. In-situ pre-lithiation is performed inside the battery package to prepare the positive electrode, and a carbon-based material is used as the negative electrode active material to prepare the negative electrode. The resulting carbon-sulfur battery with the above positive and negative electrode system is further assembled. This battery utilizes the lithium fusion reaction of the sulfur-carbon compound positive electrode material and the intercalation or alloying lithium fusion reaction of the carbon-based negative electrode to achieve an electrochemical redox reaction between the positive and negative electrode systems, thereby converting chemical energy into electrical energy. The sulfur-carbon compound positive electrode material exhibits high structural stability during the lithium fusion reaction. Compared to the loss of positive electrode active material caused by soluble lithium polysulfides during the discharge of elemental sulfur positive electrodes, a positive electrode with high cycle stability can be obtained. Furthermore, by utilizing the reversible lithium intercalation / deintercalation or alloying reaction of carbon-based materials to replace the unstable and highly active metallic lithium negative electrode, high cycle stability of the negative electrode can be achieved.

The application provides a test method and application for quantifying silicon-carbon and graphite capacity in a mixed electrode, and relates to the technical field of batteries. The test method uses XRD technology to obtain diffraction peak intensity of each phase of graphite in a pure graphite negative electrode sheet, calculates specific capacity constants corresponding to each phase of graphite according to the relationship between the diffraction peak intensity of each phase of graphite and the relative specific capacity of each voltage platform of the pure graphite negative electrode sheet, then obtains the diffraction peak intensity of each phase of graphite in a silicon-carbon / graphite mixed negative electrode sheet through XRD, combines the calculated specific capacity constants corresponding to each phase of graphite, measures the real specific capacity contribution of silicon-carbon and graphite under each SOC condition in the mixed negative electrode sheet, and calculates the lithium intercalation amount of the negative electrode material according to theoretical calculation. The test method can be applied to the determination of the silicon-carbon and graphite capacity in silicon-carbon / graphite mixed electrodes with different silicon doping ratios, the test result is real and reliable, continuous and stable, and the test time can be saved.

The invention relates to the technical field of batteries, in particular to porous carbon. The invention provides porous carbon, the porous carbon comprises micropores, the percentage of the pore volume of the micropores in the total pore volume is greater than or equal to 85%, and in a pore distribution curve with the abscissa being the pore diameter and the ordinate being the differential pore volume dV / dW obtained by a nitrogen adsorption method test, the differential pore volume dV / dW of the porous carbon is greater than 0.05 cm < 3 >. G <-1 >. Nm <-1 > within the pore diameter range of 1-2nm. The porous carbon has proper microporosity and pore size distribution in Koelreuteria-shaped distribution, can effectively improve the silicon loading efficiency, reserves a part of space for volume enlargement caused by silicon expansion in the nanometer silicon circulation process, has the effect of relieving volume expansion when lithium is embedded into silicon, can reduce the volume expansion rate of the silicon-based negative electrode material, and improves the silicon-based negative electrode material performance. The cycling stability of the battery is improved.

The present disclosure provides a negative electrode for a lithium secondary battery and a method for manufacturing the negative electrode for a lithium secondary battery. A negative electrode for a lithium secondary battery according to the present disclosure comprises a current collector and a porous structure disposed on the current collector, wherein the porous structure includes a semiconductor inorganic material, and the band gap of the semiconductor inorganic material may decrease due to the insertion of lithium into the crystal of the semiconductor inorganic material.

A negative electrode material, including graphite, where the negative electrode material has an I-order lithium intercalation plateau potential P1 of 30 mV to 75 mV and an II-order lithium intercalation plateau potential P2 of 90 mV to 110 mV. The use of the negative electrode material of this application can significantly improve the cycling performance of the electrochemical apparatus using the negative electrode material under high voltage and high temperature, enhance the gram capacity of the negative electrode material, while maintaining the initial efficiency of the negative electrode material.

The invention discloses an ultraviolet curing composite proton exchange membrane and a preparation method and application thereof.The preparation method comprises the steps that a composite solution is cast on a carrier, ultraviolet irradiation, drying and aftertreatment are conducted, the ultraviolet curing composite proton exchange membrane is obtained, and the composite solution comprises perfluorinated sulfonic acid resin, lithium titanium aluminum phosphate, a cross-linking agent and a photoinitiator; the cross-linking agent is cystamine, and the post-treatment comprises the following steps: soaking in hydrogen peroxide, water, sulfuric acid and water in sequence. The perfluorinated sulfonic acid resin is used as a basis, cystamine is used as a cross-linking agent, a dynamic cross-linked network is formed through disulfide bonds of cystamine, the diaphragm has a self-repairing function, lithium titanium aluminum phosphate powder is doped, and after lithium titanium aluminum phosphate is embedded into the perfluorinated sulfonic acid resin, an additional ion transmission path can be formed, so that the proton conductivity of the diaphragm is improved, and the proton conductivity of the diaphragm is improved. And the rigid structure of the lithium titanium aluminum phosphate enhances the mechanical strength of the perfluorosulfonic acid resin and improves the dimensional stability of the proton exchange membrane.

The application relates to the technical field of electrochemical devices, in particular to a secondary battery, an electric device and a preparation method of the secondary battery. The secondary battery comprises a negative electrode sheet, the negative electrode sheet comprises a current collector and a first active material layer, the first active material layer is arranged on at least one surface of the current collector, and the first active material layer comprises a silicon-based material and a solid-state electrolyte, and the solid-state electrolyte is at least partially combined to the surface of silicon in the silicon-based material. The secondary battery and the electric device provided by the embodiments of the application can improve the expansion problem of the silicon-based material, and enhance the structural integrity and the structural stability of the negative electrode sheet. In addition, since the solid-state electrolyte is used in the application, compared with the existing technology of coating the silicon-based material with a binder, the lithium intercalation capacity of the silicon-based material can be improved, the ion conduction rate in the negative electrode sheet is improved, and the problem of the deterioration of the kinetic performance of the secondary battery caused by the coating of the silicon-based material with the binder is solved.

The present invention relates to a relithiated lithium insertion material for producing lithium metal or for prelithiating electrode materials, as well as an anode and a manufacturing electrolytic cell comprising the material. The present invention also relates to a method for producing lithium metal and for prelithiating electrode materials, which method comprises conducting an electrolytic reaction to produce lithium in an electrolytic cell comprising the relithiated lithium insertion material as the anode, a current collector as the cathode, and an electrolyte comprising a lithium salt.

The application provides a silicon negative electrode and a preparation method thereof, and a full-solid-state lithium ion battery and a preparation method thereof. The silicon negative electrode comprises a negative electrode current collector and a silicon active layer formed on the surface of the negative electrode current collector, wherein the silicon active layer comprises a plurality of silicon lithium intercalation regions distributed at intervals, and the gaps between the plurality of silicon lithium intercalation regions are distributed in the form of spots at intervals on the surface of the silicon active layer. The gaps between the plurality of silicon lithium intercalation regions of the silicon active layer in the silicon negative electrode of the embodiment of the application can provide accommodation space for the silicon which generates volume expansion when intercalating lithium, so that the cracking and peeling of the silicon active layer when deintercalating lithium can be avoided, and the cycle life of the full-solid-state lithium ion battery is improved.

The invention discloses a quick-charging lithium battery and a preparation method thereof, and belongs to the technical field of lithium batteries. The invention discloses a quick-charging lithium battery. Comprising a positive pole piece, a diaphragm, a negative pole piece and an electrolyte, wherein a negative active material of the negative pole piece comprises the following components in parts by weight: 6-8 parts of N-P doped hollow silicon carbon particles, 3-5 parts of a dual-network adhesive and 2-4 parts of conductive graphite; the double-network adhesive is a polyacrylic acid-polyvinyl alcohol double-network adhesive containing an ether oxygen chain. Hollow cavities in the N-P doped hollow silicon carbon particles in the negative electrode active material provide a buffer space for huge volume expansion of silicon in a lithium intercalation process, and shorten a diffusion path of lithium ions, so that rapid ion transmission can be realized. The doping of N and P improves the electronic conductivity of the material, reduces the charge transfer impedance, and improves the lithium ion migration ability, thereby reducing the generation and accumulation of heat. The dual-network adhesive provides an additional heat conduction path, and continuous charging multiplying power under high multiplying power can be achieved.

The application relates to the new energy technology field, in particular to a lithium ion battery and an electric equipment. The application uses a first silicon-based material and a second silicon-based material simultaneously, considers the relief of expansion stress and the improvement of dynamic performance; by limiting the average value of the maximum width of the surface gully of the first silicon-based material and the second silicon-based material Dn 10 , the second silicon-based material is prevented from being embedded in the gully of the first silicon-based material, the second silicon-based material is prevented from being limited in the gully during lithium intercalation expansion, local stress concentration is caused, and the positive electrode current collector is prevented from being broken due to expansion stress; meanwhile, the positive and negative electrode short circuit caused by the sharp edges and corners of the broken silicon-based material piercing the diaphragm is avoided, and the safety performance is improved; the number of pinholes of the aluminum foil is controlled, which is helpful for preventing the aluminum foil from being broken at the pinholes; the aluminum foil elongation in each direction is controlled, which is helpful for keeping the aluminum foil elongation stable in each direction, dispersing the expansion stress, and avoiding being locally torn during the battery expansion process.

The invention relates to the technical field of batteries, and provides a battery monomer and a power utilization device. The battery cell provided by the invention comprises a negative electrode plate, the negative electrode plate comprises a negative electrode current collector and a negative electrode film layer arranged on at least one surface of the negative electrode current collector, the negative electrode film layer comprises a negative electrode active material and a high-potential lithium intercalation material, and at least part of the high-potential lithium intercalation material is distributed among particles of the negative electrode active material; and the particle size of the high-potential lithium intercalation material is smaller than that of the negative electrode active material. According to the battery monomer provided by the invention, the high-potential lithium intercalation material with the particle size smaller than that of the negative electrode active material is introduced into the negative electrode film layer, so that the high-potential lithium intercalation material can be uniformly distributed among particles of the negative electrode active material, and the high-potential lithium intercalation material can be in full contact with the negative electrode active material; therefore, the effect of the high-potential lithium intercalation material can be fully exerted, so that the transmission rate of lithium ions in the negative pole piece is effectively improved, and the fast charging performance of the battery monomer is further improved.