140results about How to "Improve Interface Stability" patented technology

This invention belongs to the technical field of lithium battery anode materials, specifically relating to a highly conductive graphite electrode material and its preparation method. The preparation method includes: pre-dissolving sodium carboxymethyl cellulose into a gel solution, then ball-milling and mixing graphite and conductive carbon black, dispersing them together with a cobalt hexacyanorubium(II)-dodecyltungstencobalt(III) salt hybrid material and hafnium diboride nanomaterials in the gel solution, adjusting the acidity, adding styrene-butadiene rubber emulsion to obtain a uniform slurry, and then coating, drying, and compacting to obtain the anode sheet. This invention significantly improves the conductivity and structural stability of the graphite anode through the synergistic effect of the interface modification of the cobalt hexacyanorubium(II)-dodecyltungstencobalt(III) salt hybrid material and the conductive framework of the hafnium diboride nanomaterials. The process is safe and controllable, and suitable for industrial production of lithium-ion batteries.

The invention belongs to the field of organic electrolytes and potassium ion batteries, and particularly relates to a low-concentration ionic liquid electrolyte for breaking the concentration balance of potassium ions and anions and a high-energy-density potassium ion battery. The potassium ion battery comprises a Prussian blue (PB) positive electrode, an electrolyte and a commercial ferrocene (Fc) negative electrode which is not subjected to any treatment, and the electrolyte is a low-concentration ionic liquid electrolyte (FSI-: K + (3.5 / 0.3 M)) of potassium bis (fluorosulfonyl) imide (KFSI). The low-concentration ionic liquid electrolyte developed by the invention has a high anion: K < + > concentration ratio (3.5: 0.3 M), increases the solvation proportion of rich anions, reduces the dissolution of an Fc organic metal compound, and ensures high interface stability and rapid K < + > storage kinetics of an Fc negative electrode. Meanwhile, the electrochemical window of the low-concentration electrolyte is widened, the PB positive electrode can stably circulate at 1.0-4.4 V, the long-period circulation and excellent rate capability of the PBFc total battery are also realized, and the total battery has the energy density of 246.7 Wh / kg under the current density of 20 mA / g.

The application relates to the technical field of batteries, in particular to a positive electrode material, a preparation method thereof, a positive electrode sheet and a battery. The positive electrode material comprises: an inner core, wherein the inner core comprises a high-nickel ternary positive electrode material; a first coating layer coated on the surface of the inner core, wherein the first coating layer comprises an oxide of cobalt, an oxide of titanium and an oxide of aluminum; and a second coating layer coated on the surface of the first coating layer, wherein the second coating layer comprises an oxide of selenium; wherein the surface of the high-nickel ternary positive electrode material is treated by an organic acid. The technical scheme can reduce the residual alkali on the surface of the material, effectively improve the structural stability and interface stability of the material in the long-term cycle process, and thus realize excellent cycle life and capacity retention rate.

This invention relates to the field of cathode material technology for lithium-ion batteries, specifically a method for in-situ construction of ultrathin amorphous nano-coating materials. The method involves the in-situ construction of ultrathin amorphous nano-coating layers using sol-gel, co-precipitation, and electrodeposition combined with hydrothermal methods. 2 MnO 3 The cathode material is coated to encapsulate Li. x MnO y The amorphous nanostructure is uniform and completely coated on Li. 2 MnO 3 The surface of the positive electrode material (Li x MnO y @Li 2 MnO 3 ), where Li x MnO y It is an amorphous coating layer with a thickness of 0.1-10 nm; this invention utilizes Li 2 MnO 3 The cathode material is coated with an ultrathin amorphous Li. x MnO y While ensuring the high discharge specific capacity of the material, it also significantly suppresses Li 2 MnO 3 The voltage decay was observed, and after assembling it into a coin cell and testing its performance, the coated Li was found to have... 2 MnO 3 The material exhibits zero voltage decay after 50 charge-discharge cycles.

The invention provides an electrolyte and a lithium ion battery using the same, the electrolyte comprises an electrolyte additive, and the electrolyte additive comprises a first compound and a second compound; wherein the chemical structural formula of the first compound is shown as a formula (I-a) or a formula (I-b), and the chemical structural formula of the second compound is shown as a formula (II); in the formula (I-a), the formula (I-b) and the formula (II), R1 to R10 are respectively and independently selected from hydrogen atoms, halogen atoms, carbonyl groups, cyano groups, isocyanate, isothiocyanate, unsubstituted or substituted alkyl groups of C1 to C10, unsubstituted or substituted alkoxy groups of C1 to C10, unsubstituted or substituted alkenyl groups of C2 to C10, unsubstituted or substituted alkynyl groups of C2 to C10 and unsubstituted or substituted aryl groups of C6 to C20; and in the formula (II), the number of cyano groups is greater than or equal to 1. By introducing the first compound and the second compound, the normal-temperature and high-temperature cycle performance and low-temperature performance of the battery during high-voltage operation are improved.

The present application relates to the technical field of conductive foil, specifically to a multilayer composite conductive foil and its preparation method and application, specifically comprising the following steps: S1. aluminum foil is immersed in NaOH solution and then cleaned with deionized water, dried to obtain pretreated aluminum foil; S2. using a magnetron sputtering instrument, using a Ti-Zn-C-Ni composite target material to sputter the pretreated aluminum foil, and obtaining a transition layer conductive foil after deposition; S3. the modified functional slurry is coated on the surface of the transition layer conductive foil by a doctor blade coater, then added to an oven for segmented curing, and then annealed, and after cooling to room temperature, a multilayer composite conductive foil is obtained. The present application forms a strong adhesion bottom layer with the substrate through the composite process design of sputtering and coating, blocks the corrosion of electrolyte to the substrate, and also bears the conductive and catalytic functions. The two functional layers obtained by the two processes are further fused through annealing treatment, forming a gradient interface, eliminating interlayer stress, and improving the overall structural stability.

The invention provides a preparation method and application of a composite diaphragm with a multistage nanometer branch structure, and belongs to the technical field of lithium metal batteries. A polymer matrix, a first structure inducer and a second structure inducer form a precursor solution, and the precursor solution is subjected to an electrostatic spinning process and in-situ induction to form the multi-stage structure composite diaphragm with a trunk-branch characteristic; the first structure inducer is a quaternary ammonium salt compound, and the second structure inducer is imidazolium ionic liquid. The dual-inducer system endows the lithium metal negative electrode with interface stability and cycle reliability.

This invention discloses a hydrocolloid material containing guaiac, its preparation method, and its application, belonging to the field of medical care materials technology. It includes a backing layer and a hydrocolloid functional layer. The hydrophobic elastomer matrix comprises polyisobutylene, styrene-isoprene-styrene block copolymer, tackifying resin, liquid paraffin, and optionally caprylic / capric triglycerides. The pre-wetted hydrophilic absorbent powder comprises sodium carboxymethyl cellulose, pectin, gelatin, calcium alginate, sodium alginate, and caprylic / capric triglycerides. The composite plant repair oil comprises a phellodendron amurense lipid dispersion, Lithospermum erythrorhizon-Angelica dahurica extract, borage oil, sandalwood seed oil, borneol, and DL-α-tocopherol. The guaiac nanoliposome lyophilized powder is obtained by sequentially coating a guaiac nanoliposome aqueous dispersion with quaternized chitosan and sodium hyaluronate, then adding a lyophilization protectant and freeze-drying. This invention solves the problems of poor dispersion stability, easy degradation, insufficient soothing and repairing ability of guaiac, and instability in oil-water blends.

The invention discloses a lithium manganate positive electrode material, a preparation method and an applied lead-lithium battery, relates to the technical field of lithium manganate positive electrode materials, and solves the problems that the existing lithium manganate positive electrode material is poor in structure and interface stability and poor in rate and cycle performance. The positive electrode material is composed of a lithium manganate matrix and a double-layer composite coating, the matrix is prepared by taking lithium carbonate and manganous-manganic oxide as raw materials and doping magnesium hydroxide, aluminum hydroxide and titanium dioxide multi-plasma phase; the lithium manganate positive electrode material is prepared by uniformly compounding a lithium manganate matrix modified by a spinel inner layer, vinyl functionalized MOF and a polyvinylidene fluoride-hexafluoropropylene copolymer on the surface of an aluminum foil receiver through an electrospinning-electrospray synergistic process. The material is applied to the lead-lithium battery, shows excellent electrochemical performance and has good practical application value.

The invention relates to the technical field of batteries, in particular to a composite buffer structure for a battery and a preparation method and application thereof. A composite buffer structure for a battery comprises a polymer matrix layer and a reinforcement phase located in the polymer matrix layer, the reinforcement phase comprises a shape memory alloy fiber layer, and the shape memory alloy fiber layer is of a three-dimensional network structure; and the volume fraction of the shape memory alloy fiber layer in the composite buffer structure for the battery is 10%-60%. According to the composite buffer structure for the battery, the polymer matrix layer serves as a continuous phase, the shape memory alloy fiber layer serves as a reinforcing phase, and the polymer matrix layer and the shape memory alloy fiber layer are mutually staggered in the polymer matrix layer to form a three-dimensional network structure; the shape memory alloy fiber layer with a proper volume fraction is adopted, can actively adapt to the volume change of a battery cell, shows superelasticity at the working temperature of the battery, provides high and stable recovery stress, and is excellent in fatigue resistance, so that long-term stable contact of a battery interface is effectively maintained.

The invention provides a silane deposition silicon-carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium battery materials. The preparation method comprises the following steps: performing in-situ reaction on zinc salt, dimethylimidazole and a pore-forming agent to obtain a first precursor; and after carbonization treatment, alkali activation is carried out, and then vapor deposition is adopted to obtain the silane deposition silicon-carbon composite material. The prepared silane deposition silicon-carbon composite material has good stability and mechanical strength, hierarchical pore structure distribution and high-capacity ultra-long circulation. The method can solve the problems that existing vapor deposition silicon-carbon is poor in structural stability, and pores of a carbon matrix obtained through traditional ZIF-8 carbonization are prone to collapse.

The present application relates to a kind of electrolyte additives and its preparation method, belong to electrolyte technical field;The present application uses propenyl-1,3-sulfonic acid lactone as raw material, using the double bond of propenyl-1,3-sulfonic acid lactone and the amino group of 4-amino-2-(trifluoromethyl) thiophene occurs Michael addition reaction under the catalysis of 1,8-diazabicyclo (7-ene) Undecane, obtain the intermediate with tertiary amine structure, then through the quaternary ammonium salt reaction of tertiary amine structure of intermediate and bromo atom of ethyl bromoacetate, obtain additive, the additive of the present application and phosphate ester additive are compounded to obtain electrolyte additive, the present application is modified by propenyl-1,3-sulfonic acid lactone, introduce fluorinated alkyl, effectively reduce intermolecular force, weaken the dependence of electrolyte viscosity on temperature, improve the ionic conductivity of electrolyte under low temperature condition.

The invention discloses a battery fiber of an ultraviolet curing electrolyte as well as a preparation method and application of the battery fiber. The battery fiber comprises an electrode fiber core, a gel electrolyte layer and a polymer encapsulation layer from inside to outside. The electrode fiber core is formed by twisting and compounding a positive electrode fiber and a negative electrode fiber; the gel electrolyte layer is formed by curing a precursor containing a photocuring monomer, a photoinitiator, a linear polymer and a lithium salt through ultraviolet irradiation. According to the preparation method, a stable gel electrolyte layer is rapidly constructed on the surface of the fiber at normal temperature through an ultraviolet curing technology, so that the potential safety hazard that a traditional liquid electrolyte is easy to leak is solved, an electrode-electrolyte interface is also remarkably optimized, and the interface impedance is reduced. The obtained battery fiber has excellent flexibility, high safety and good electrochemical performance, the slender one-dimensional form of the battery fiber can be directly woven into an intelligent fabric through a textile technology, and an ideal flexible embedded power supply solution is provided for wearable electronic equipment.

The invention discloses a dry-method lithium supplement positive electrode material and a preparation method thereof, a positive electrode membrane and a preparation method thereof, and a lithium ion battery, and belongs to the technical field of lithium batteries. The dry-method lithium supplement positive electrode material comprises a positive electrode active material, a conductive additive, a polymer binder and Li6WO6, based on 100% of the total mass of the positive electrode active material, the conductive additive and the polymer binder, the mass percentage of the positive electrode active material is 80-85%; the mass percent of the conductive additive is 5-10%; the mass percent of the polymer binder is 0.5-5%; and the mass of Li6WO6 is 5-9% of the total mass of the positive electrode active material, the conductive additive and the polymer binder. When the dry-method lithium supplementing positive electrode material is used for carrying out dry-method lithium supplementing on a lithium ion battery, Li6WO6 is not easy to bond and agglomerate, the stability is high, and the lithium supplementing effect is good; the lithium ion battery containing the dry-method lithium supplement positive electrode material has excellent cycling stability and high first-circle specific capacity.

This application belongs to the field of lithium-ion battery technology and provides a secondary battery and its application. The secondary battery includes an electrolyte; the electrolyte includes additives and a solvent, wherein the content of the additives in the electrolyte is 'a'; the solvent includes a carboxylic acid ester compound, wherein the content of the carboxylic acid ester compound in the solvent is 'b'; the ratio of the negative electrode interface impedance to the total impedance of the secondary battery is 'c'; n = a × c / b, where 0.0000068 ≤ n ≤ 0.036. The secondary battery of this invention precisely matches the electrolyte components with the internal impedance characteristics of the battery, effectively improving lithium-ion transport efficiency at low temperatures and simultaneously suppressing the deposition of metallic lithium on the negative electrode surface. Furthermore, the film-forming additives enhance the stability of the negative electrode interface, ultimately achieving a synergistic improvement in the low-temperature fast-charging performance, safety, and cycle life of the secondary battery.

The application discloses a polymer electrolyte for a lithium metal battery and a preparation method and application thereof, and relates to the technical field of battery electrolyte materials. + The desolvation energy barrier at the electrode interface is reduced, the ionic conductivity of the electrolyte is significantly enhanced, and the lithium ion can be guided to form a stable solid electrolyte interface film in cooperation with the lithium ion, so that the uniform lithium ion flow is achieved, the uncontrollable growth of lithium dendrites is significantly inhibited, the side reaction consumption of the electrolyte in the cycle process is greatly reduced, and the long-period stability of the battery is effectively ensured, and the application is suitable for large-scale popularization and application in lithium metal batteries.

The application provides a sodium ion composite polymer solid-state electrolyte and a preparation method thereof. The preparation method can include the following steps: mixing active filler powder with a citric acid solution to obtain modified active filler powder; mixing the modified active filler powder, a polymer and a sodium salt to obtain precursor powder; dispersing the precursor powder on a polypropylene film, hot-pressing into a film, and drying to obtain the sodium ion composite polymer solid-state electrolyte. The preparation method of the application uses citric acid as a dispersant for the active filler, can inhibit the agglomeration of the active filler, make the active filler uniformly dispersed in the electrolyte, and improve the ionic conductivity.

The invention provides a composite positive electrode material and a preparation method thereof, a positive plate, a battery, a battery pack and electric equipment. The composite positive electrode material comprises a positive electrode active material matrix, ion conductor particles and electronic conductor particles, the ion conductor particles and the electronic conductor particles are respectively distributed along the surface of the positive electrode active material substrate; wherein at least part of the positive electrode active material matrix is combined with the ion conductor particles in a polar covalent bond manner. The specific structure of the composite positive electrode material not only can maintain the original advantages of the positive electrode active material matrix, but also effectively improves the ionic conductivity and electronic conductivity, so that the all-solid-state battery has higher rate capability, and can maintain the advantages of high interface stability and high energy density.

The embodiment of the application provides a high-safety semi-solid battery suitable for black start of energy storage coupled gas turbine and a preparation method. The method synthesizes a 1,3-dioxane monomer containing phosphate ester modification through condensation and esterification reactions under an acidic condition, and prepares modified layered double hydroxide (LDH) with a surface grafted with a vinyl functional group; the modified LDH is added to a xanthan gum dispersion liquid for compounding, and then monomers, an initiator and a lithium salt are added for in-situ anionic ring-opening polymerization, and the compounding gel electrolyte is obtained through staged temperature curing and vacuum drying, and finally a battery is assembled. Through chemical design and process control, the component compatibility and interface stability are synergistically improved, the obtained battery has excellent flame retardance, puncture resistance and high electrochemical performance, and is particularly suitable for high-safety demand scenes of energy storage black start.

This invention discloses an impact-resistant plastic granule and its preparation method, belonging to the technical field of polyamide modified materials. The preparation method includes the following steps: raw material drying pretreatment, premixing and activation treatment, overall material blending, twin-screw oriented melt extrusion, cooling granulation, and post-treatment sieving. A twin-screw extruder, combined with a stretching die, induces hydroxyapatite (HAP) nanowires to orient orderly along the melt flow direction, forming a biomimetic enamel-like framework structure. Simultaneously, utilizing the B-N coordination between the terminal amino groups of polyamide and boric acid, and the dehydration esterification reaction of the terminal hydroxyl groups introduced by the hydroxylated graft compatibilizer with boric acid and HAP surface hydroxyl groups, dynamic borate ester covalent bonds and B-N coordination bonds are generated in situ, supplemented by Ca coordination bonds and hydrogen bonds to construct a multi-interface bonding system. This invention completely eliminates the use of elastomer toughening agents, increasing the notched impact strength of the cantilever beam from 5 kJ / m of pure PA6 to 12–15 kJ / m, and the flexural modulus from 2.5 GPa to 3.2–3.8 GPa, achieving a simultaneous improvement in rigidity and toughness.

The invention discloses a high-strength impact-resistant glass product and a preparation method of the high-strength impact-resistant glass product in the field of glass, and the high-strength impact-resistant glass product comprises the following raw materials in parts by weight: 50-60 parts of SiO2; 10 to 15 parts of Al2O3; 5 to 8 parts of Li2O; 1 to 3 parts of Na2O; 0.5 to 1.5 parts of K2O; 2 to 5 parts of P2O5; 2 to 4 parts of ZrO2; 1 to 3 parts of TiO2; 1 to 2 parts of B2O3; 0.5 to 2 parts of rare earth oxide; 4 to 12 parts of modified SiC particles; and 1 to 3 parts of modified MoAlB particles. The modified SiC particles and the modified MoAlB particles are adopted as a double-phase reinforcing system, the thermal matching performance with a glass matrix is enhanced, and the strength and toughness of the final glass product are greatly improved under the assistance of the structural densification effect of the rare earth oxide.

This invention relates to the field of lithium battery packaging materials technology, and discloses a flexible packaging film for battery cells and its preparation process. The flexible packaging film comprises a protective outer layer, a first adhesive layer, an aluminum foil layer, a second adhesive layer, and a heat-sealing inner layer stacked sequentially, wherein a corrosion-resistant bonding layer is disposed between the aluminum foil layer and the second adhesive layer. The corrosion-resistant bonding layer is formed by curing and cross-linking a coating liquid containing a surface-functionalized graphene oxide-supported nano-layered zirconium phosphate composite on the surface of the aluminum foil. The heat-sealing inner layer is a multilayer co-extruded functional polypropylene film layer comprising an adhesive transition layer, a support layer, and a heat-sealing layer. By constructing a corrosion-resistant bonding layer at the aluminum foil interface and optimizing the multilayer structural design of the heat-sealing inner layer, the stability of the aluminum-plastic composite interface, the heat-sealing reliability, and the overall mechanical compatibility can be improved, thereby improving the comprehensive performance of the flexible packaging film for battery cells under high temperature, high humidity, and electrolyte contact conditions, making it suitable for the packaging of power batteries and energy storage batteries.

This invention discloses a high-performance polymer electrolyte based on a functionalized fluorinated ether diluent and its preparation method, relating to the field of electrochemical energy storage materials technology. The high-performance polymer electrolyte comprises: a polymer matrix, a lithium salt, an organic dispersion solvent, and a functionalized fluorinated ether diluent. By introducing a fluorinated ether diluent with a specific structure, this invention synergistically regulates the crystallization behavior of the polymer matrix and the lithium-ion solvation structure, solving core problems in traditional polymer electrolytes such as low ionic conductivity, poor interfacial stability, and lithium dendrite growth. The resulting electrolyte possesses high ionic conductivity, high lithium-ion transference number, and excellent interfacial stability, making it suitable for high-energy-density lithium metal batteries.

The application belongs to the technical field of new energy battery materials, and discloses a composite solid electrolyte and a preparation method and system thereof. The preparation method comprises the following steps: under an inert atmosphere, a pretreated sulfide solid electrolyte and a pretreated halide solid electrolyte are put into a cavity; under the action of an ultrasonic standing wave, the sulfide solid electrolyte is suspended, and the halide solid electrolyte is dispersed; a gradient electric field in the vertical direction is formed through upper and lower electrode plates in the cavity, so that the halide solid electrolyte is coated on the sulfide solid electrolyte, and the composite solid electrolyte is obtained. The method provided in the application realizes uniform coating of LIC on LPSC, the coating layer is uniform, the interface is firmly combined, the interface stability and the oxidation resistance of LPSC are effectively improved, and the ionic conductivity of LIC and LPSC is retained.

The application provides a double-coating lithium iron phosphate positive electrode sheet, a preparation method and application thereof. The preparation method comprises the following steps: mixing modified large-particle lithium iron phosphate, modified small-particle lithium iron phosphate, a conductive agent, a binder and a solvent to obtain a first slurry and a second slurry; adopting double-layer slot extrusion coating to coat the first slurry on the surface of a current collector and coat the second slurry on the surface of the first slurry; and drying and rolling to obtain the double-coating lithium iron phosphate positive electrode sheet; the modified large-particle lithium iron phosphate is doped with Ti and Nb, and the modified small-particle lithium iron phosphate is doped with Mg and Al. The application adopts a multi-element doped positive electrode material combined with a double-layer coating preparation method to avoid the shortcomings of LFP materials, improve the rate performance, high-temperature performance and cycle performance of LFP, and has the advantages of simple preparation process and easy industrial production. The prepared positive electrode material and the secondary battery using the same have excellent comprehensive performance, and have a wide application prospect in the field of power batteries.

The invention belongs to the field of organic electrolyte and potassium ion batteries, and particularly relates to a high-energy-density potassium ion battery realized by medium-entropy electrolyte applicable to an alloy antimony / conductive carbon negative electrode. The potassium ion battery comprises a Prussian blue (PB) positive electrode, an electrolyte and an antimony / conductive carbon (Sb / SP) negative electrode, and the electrolyte is a medium-entropy electrolyte of potassium bis (fluorosulfonyl) imide (KFSI). The obviously improved rate performance of the medium-entropy electrolyte and the Sb / SP developed by the invention is attributed to a balance solvation structure driven by a double-entropy effect and a weak solvation effect, and the structure provides a collaborative guarantee for enough interface stability and dynamic compatibility. Meanwhile, the electrochemical window of the ether-based electrolyte is widened, the PB positive electrode can stably circulate at 2.0-4.4 V, and the PBMSESb / SP total battery can achieve the high energy density of 194 Wh / kg under the current density of 50 mA / g (based on the total mass of PB and Sb / SP).

The invention relates to the technical field of plastics, in particular to an ultrathin micro-texture mobile phone rear cover plate and a preparation method thereof. The method comprises the following steps: carrying out end group regulation on polyhexamethylene adipamide resin through hexamethylene diamine, and carrying out melt blending on the polyhexamethylene adipamide resin, tetraethyl orthosilicate and hydroxyl-terminated polydimethylsiloxane through a sol-gel reaction to obtain hybrid inorganic powder; hydroxyl-terminated polydimethylsiloxane and hexamethylene diisocyanate are sequentially added by adopting a step-by-step feeding strategy for modification. And then molding in a mold with micro textures through an injection molding-compression molding process, and carrying out limited annealing treatment. According to the invention, the problems of incomplete micro-texture copying, easy scratching and poor thermal dimensional stability of the ultrathin plate are effectively solved, and high-precision texture transfer, excellent surface scratch resistance and long-term flatness of the plate with the thickness of 320-380 microns are realized.

The invention relates to the technical field of lithium ion batteries, and discloses a ternary positive electrode material and a preparation method and application thereof. The preparation method of the ternary positive electrode material provided by the invention comprises the following steps: S1, mixing a small-particle ternary positive electrode material precursor with a lithium source and a doping agent, carrying out first sintering, cooling and crushing to obtain a small-particle primary sintering product; mixing the large-particle ternary positive electrode material precursor with a lithium source and a doping agent, carrying out primary sintering, and crushing to obtain a large-particle primary sintering product; and S2, mixing the small-particle primary sintering product and the large-particle primary sintering product with a coating agent, and carrying out secondary sintering to obtain the ternary positive electrode material. The ternary positive electrode material prepared by the preparation method provided by the invention is large in compaction density, low in residual alkali content, good in interface stability, and relatively good in capacity and cycling stability, and the electrochemical performance of the ternary positive electrode material under a high-voltage condition is remarkably improved.

The invention provides a metal / heteroatom co-doped silicon carbon negative electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The metal compound and heteroatoms are uniformly distributed on the porous carbon substrate in an in-situ growth doping manner, so that the electron conductivity of the material is improved, the diffusion rate of lithium ions in the material and on an interface is also improved, and the reaction kinetics of the silicon-carbon negative electrode material is further synergistically improved. Meanwhile, the prepared silane deposited silicon-carbon negative electrode material has good conductivity, high structural stability and long cycle life.

The present invention pertains to a negative electrode for a lithium secondary battery, a method for manufacturing same, and a lithium secondary battery including same. More specifically, the negative electrode for a lithium secondary battery according to the present invention has a protective layer containing a three-dimensional structure composed of metal and lithium nitride, and thus uniform ionic conductivity and electrical conductivity can be induced on the surface of the negative electrode.