194 results about "Solid-state lithium-ion battery" patented technology

The invention is applicable to the field of solid-state electrolyte and solid-state lithium ion batteries, and provides a preparation method of cubic-phase lithium lanthanum zirconium oxide solid-state electrolyte, which comprises the control of phase, grain size and element doping, and comprises the following steps: firstly, synthesizing a metal oxide precursor by using a coprecipitation method; carrying out surface modification on the metal oxide precursor through a rotary evaporation process, and simultaneously completing drying treatment; calcining the modified precursor powder under certain temperature and atmosphere conditions to obtain a corresponding metal oxide; and adding a lithium source and a doping agent into the metal oxide, and sintering at a certain temperature, atmosphere and pressure environment to obtain the LLZO solid electrolyte material with the cubic phase structure. According to the invention, the target of preparing the cubic phase LLZO solid electrolyte at a relatively low sintering temperature is achieved by regulating and controlling the particle size of the powder and introducing the doping element.

The invention relates to the technical field of new energy automobile batteries, in particular to a solid-state lithium ion battery with a stable and safe structure and a preparation technology thereof.The solid-state lithium ion battery comprises a hard shell, a battery negative electrode, a battery positive electrode and a solid-state electrolyte, and the battery negative electrode, the battery positive electrode and the solid-state electrolyte are arranged in the hard shell; a pressure-equalizing side plate is fixedly arranged on the arc telescopic sleeve, and the pressure-equalizing side plate, the arc telescopic sleeve and the hard shell are matched to form a closed cavity; according to the solid-state lithium ion battery disclosed by the invention, through the cooperation of the voltage-sharing side plates, the arc-bending telescopic sleeve, the voltage regulating structure and the like, the contact pressure among the battery cathode, the battery anode and the solid-state electrolyte can be automatically increased during large-current charging and discharging of a new energy automobile, and the battery performance is improved.

The invention relates to the technical field of solid-state lithium ion batteries, in particular to a composite solid-state electrolyte diaphragm, a preparation method and an all-solid-state battery. According to the invention, a 3D ion / electron channel is constructed through a cellulose skeleton, an oxide electrolyte nanowire directional arrangement technology is adopted, and an in-situ interface lithium fluoride repairing layer is adopted, so that the industrialization bottleneck that high ion conduction-mechanical strength-interface stability is difficult to collaboratively optimize in the prior art is broken through; the common problems of insufficient bulk phase and interface ion conductivity, poor mechanical strength, poor compatibility with a high-nickel positive electrode / silicon carbon negative electrode and the like of a solid-state battery are effectively solved. The mass energy density of the prepared all-solid-state battery can reach 360 Wh / kg, the capacity retention ratio can still be maintained at 80% or above after 1100 times of circulation, and the all-solid-state battery successfully passes 190 DEG C thermal runaway and acupuncture tests and shows excellent safety performance and wide industrial application prospects.

The invention belongs to the technical field of solid-state batteries, and provides a lithium-ion solid-state electrolyte and a preparation method and application thereof. The lithium ion solid electrolyte comprises a polymer matrix, a lithium salt, a polar organic compound, a polymer monomer (comprising a first monomer and a second monomer) and an anion acceptor. The preparation method comprises the following steps: mixing a lithium salt and a polar organic compound to obtain a eutectic mixture; mixing a polymer matrix, a first monomer, a second monomer and an anion acceptor with the eutectic mixture to obtain a precursor solution; and coating a substrate with the precursor solution, curing and drying. The invention also discloses a solid-state lithium ion battery comprising the lithium-ion solid-state electrolyte and a manufacturing device of the solid-state lithium ion battery. The lithium ion solid electrolyte disclosed by the invention is high in room-temperature ionic conductivity, excellent in tensile strength, tensile elongation and high in breaking strength and incombustibility, and the lithium ion transference number is increased; therefore, the battery has long-term cycle stability, and the problem of electrode stress failure under low stacking pressure is solved.

The invention discloses a modified lithium-rich manganese-based positive electrode material, a preparation method thereof and application of the modified lithium-rich manganese-based positive electrode material in a solid-state lithium battery, and belongs to the field of lithium ion battery materials. The modified lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based positive electrode material and a coating layer LiAl thereof, the molecular formula of the lithium-rich manganese-based positive electrode material is xLi2MnO3. (1-x) LiMO2, M is one or more of transition metals Ni, Co and Mn, and x is more than 0 and less than 1; and the coating layer LiAl is formed by decomposing LiAlH4. The preparation method comprises the following steps: uniformly mixing a lithium-rich manganese-based positive electrode material xLi2MnO3. (1-x) LiMO2 and LiAlH4 through a solid phase method or a liquid phase method, and then annealing in an inert atmosphere to prepare the modified lithium-rich manganese-based positive electrode material. The problems of unstable interface and poor transmission kinetics in the sulfide-based all-solid-state lithium ion battery are solved at the same time, and the first-circle charge-discharge specific capacity and cycle stability of the solid-state lithium ion battery can be improved.

The invention discloses a composite positive electrode material, a preparation method thereof, a positive electrode plate and a solid-state lithium ion battery, and belongs to the technical field of secondary batteries. The composite positive electrode material comprises a lithium-rich positive electrode material, a halide solid electrolyte and high-voltage lithium cobalt oxide which are ball-milled and mixed. And the ratio of D90 of the lithium-rich positive electrode material to D90 of the high-voltage lithium cobalt oxide is 1: (1-5). The mass ratio of the lithium-rich positive electrode material to the high-voltage lithium cobalt oxide is (0.5-9.5): (9.5-0.5), and the halide solid electrolyte accounts for 5%-30% of the mass of the composite positive electrode material. When the composite positive electrode material is used for preparing the solid-state lithium ion battery, the discharge median voltage and the discharge specific capacity of the solid-state lithium ion battery can be improved.

The invention provides a single-crystal cobalt-free lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a cobalt-free lithium-rich manganese-based precursor material, a lithium source and a grain boundary separation auxiliary agent to obtain a mixed material; the mixed material is subjected to two-stage sintering, the two-stage sintering comprises first sintering and second sintering in sequence, and the single-crystal cobalt-free lithium-rich manganese-based positive electrode material is obtained, wherein primary crystal grains of the cobalt-free lithium-rich manganese-based precursor material are of a sheet structure. According to the invention, the cobalt-free lithium-rich manganese-based precursor material of which the primary crystal grains are of a sheet structure is taken as a raw material, and under the action of the grain boundary separation auxiliary agent, a two-stage sintering process is cooperatively matched, so that the single-crystal cobalt-free lithium-rich manganese-based positive electrode material which is uniform in grain size, high in dispersity, complete in crystal grains and continuous in interface is obtained, and the cobalt-free lithium-rich manganese-based positive electrode material is not only suitable for a liquid lithium ion battery, but also suitable for a lithium ion battery. The material is more suitable for a solid-state lithium ion battery, and the electrochemical performance of the battery is effectively improved.

The invention relates to the field of solid-state lithium ion batteries, in particular to a square solid-state lithium ion battery and a production process thereof.The square solid-state lithium ion battery comprises an electric power mechanism, and the electric power mechanism is used for conducting filling treatment on a conductive agent and an inorganic material in the battery; the adjusting mechanism is used for controlling and processing the temperature at the two ends of the battery when the battery is charged and discharged; the heat dissipation mechanism is used for carrying out heat dissipation treatment on the interior of the battery; the outer side of the power mechanism is provided with a cover shell, the adjusting mechanism is fixedly installed on the outer side of the cover shell, and the heat dissipation mechanism is fixedly installed at the bottom of an inner cavity of the cover shell. According to the invention, the compatibility between the electrode and the electrolyte can be improved, the interface resistance can be reduced, the migration of lithium ions at the interface can be promoted, the growth of lithium dendrites can be prevented, and the transmission efficiency of the lithium ions at the interface can be improved.

The invention discloses application of a 2, 4-thiazolidinedione compound in a solid-state lithium ion battery electrolyte, the solid-state lithium ion battery electrolyte and a preparation method of the solid-state lithium ion battery electrolyte. The 2, 4-thiazolidinedione compound disclosed by the invention is used for preparing a solid-state lithium ion battery electrolyte, and the structure of the 2, 4-thiazolidinedione compound is as follows: # imgabs0 #, in which R1 to R7 are independently a sulfonic group, a cyano group, an ionic liquid group, a borate group, a polyether chain segment, an amino group and an ether group. The 2, 4-thiazolidinedione compound is used as a functional additive of an electrode material, the structural stability is improved through chemical bonding or physical coating, volume expansion is relieved, or an electron / ion conduction network is enhanced; a functional interface layer is formed on the surface of the electrode, so that side reaction (such as electrolyte decomposition) is inhibited, interface impedance is reduced, and the lithium metal negative electrode is stabilized (such as dendrite growth is inhibited); through an electrochemical decomposition or pre-passivation strategy, a stable solid electrolyte interface (SEI) is constructed, and the cycle life is prolonged.

The invention provides a solid-state battery electrolyte material, a preparation method thereof and a solid-state lithium ion battery. The preparation method comprises the following steps: S1, carrying out first reaction on a first raw material comprising an organic ligand, zircon salt, a first acid solution and a first organic solvent to obtain a metal organic framework material; and step S2, carrying out a second reaction on a second raw material comprising dimethyl 2, 6-dipicolinate and a metal organic framework material to obtain the solid-state battery electrolyte material. The solid-state battery electrolyte material obtained by adopting the preparation method disclosed by the invention has good mechanical properties, a wider electrochemical window and higher ionic conductivity, so that the initial efficiency, the capacity and the cycle performance of the battery are improved, and the internal resistance of the battery is reduced at the same time.

The invention belongs to the field of solid-state batteries, and particularly relates to a solid-state electrolyte with a wide electrochemical window and a solid-state lithium ion battery. According to the solid electrolyte, the metal oxyhalide and the lithium-containing zeolite are subjected to ball milling, so that the solid electrolyte with relatively high ionic conductivity and a wide electrochemical window is obtained. The solid-state electrolyte is prepared into a solid-state electrolyte membrane, the solid-state electrolyte membrane, a positive electrode and a negative electrode are assembled into a solid-state lithium battery, an ionic liquid electrolyte and a polymer monomer are added, and the solid-state lithium battery is obtained through in-situ polymerization. A polymer network exists in the solid-state lithium battery, so that the lithium ion transmission performance in the positive electrode, the negative electrode and the solid-state electrolyte and the interface transmission performance of lithium ions in the positive electrode, the negative electrode and the solid-state electrolyte can be effectively improved, and the solid-state lithium battery has higher discharge capacity and better cycling stability performance.

The invention provides a modified solid electrolyte, a preparation method thereof and an all-solid-state lithium ion battery, and belongs to the technical field of all-solid-state lithium ion battery manufacturing. The modified solid electrolyte is of a core-shell structure, an inner core is made of inorganic solid electrolyte, a shell is made of lithium-free metal sulfide, and the modified solid electrolyte can effectively solve the problem that the inorganic solid electrolyte is poor in air stability, so that the corresponding all-solid-state lithium ion battery has relatively excellent cycle performance.

A lithium-ion battery cell includes an anode including a porous lithium storage layer disposed over an anode current collector and a modification layer provided on the lithium storage layer. The cell further includes a cathode having a cathode active material layer in electrical contact with a cathode current collector and a lithium-ion-containing solid-state electrolyte (SSE) that is interposed between the lithium storage layer and the cathode active material. The lithium storage layer includes at least 40 atomic % silicon, tin, germanium, or a combination thereof. The lithium storage layer includes discontinuities defining a plurality of lithium storage layer segments each having an upper surface and a sidewall. The modification layer is disposed on the upper surface and at least partially along the sidewall.

The invention discloses a 3D printing all-solid-state lithium ion battery negative electrode for energy storage and a preparation method thereof, and relates to the technical field of solid-state batteries. The 3D printing lithium ion battery negative plate comprises a current collector, wherein a first 3D printing layer and a second 3D printing layer are sequentially arranged on the current collector; wherein the first 3D printing layer is composed of a structure unit and a gap unit; the second 3D printing layer covers the first 3D printing layer; the first 3D printing layer and the second 3D printing layer respectively comprise a silicon-based material and / or a hard carbon material. According to the 3D printing lithium ion battery negative plate, the negative electrode with the porous structure is combined with the chemical stability of the silicon-based material and / or the hard carbon material layer on the negative electrode, so that the technical problems of poor solid-solid interface contact and volume expansion of an electrode material of an existing all-solid-state battery are solved. The preparation method solves the interface contact problem of a traditional coating process, does not need to depend on a high-cost surface modification technology, reduces the process cost and is suitable for large-scale production.

The invention belongs to the technical field of lithium ion batteries, and provides an all-solid-state lithium ion battery and a preparation method thereof. The preparation method comprises the following steps: activating a positive electrode active material and a negative electrode active material; after the activation treatment is finished, immersing the positive electrode active material and the negative electrode active material into a conductive mixture solution for coating treatment; after the coating treatment is finished, sequentially drying and curing the positive electrode active material and the negative electrode active material to respectively obtain a positive electrode material and a negative electrode material; mixing a lithium salt, an organic polymer, a ceramic filler and an organic solvent to obtain an electrolyte mixture, coating a positive electrode material and a negative electrode material with the electrolyte mixture, and performing hot pressing treatment to obtain a positive electrode and a negative electrode respectively; and assembling the positive electrode, the negative electrode and the solid electrolyte to obtain the all-solid-state lithium ion battery. The invention not only effectively solves the interface problem of the current all-solid-state battery, but also provides a feasible technical path for industrial application of the solid-state battery.

The invention provides a solid-state battery which comprises a positive electrode, a negative electrode and a solid-state electrolyte layer, and the solid-state electrolyte layer is arranged between the positive electrode and the negative electrode; the positive electrode comprises a positive electrode active material and a first inorganic solid electrolyte; the positive electrode active material comprises a positive electrode active material and a polymer electrolyte coating the surface of the positive electrode active material; the solid electrolyte layer comprises a second inorganic solid electrolyte and an organic solid electrolyte compound; the organic electrolyte compound comprises a porous material and an organic electrolyte. Polymer electrolyte is introduced into the positive electrode, the prepared solid-state lithium ion battery is good in thermal stability, good in oxidation resistance and high in thermal stability, high electrical performance and low-pressure forming can be achieved, the working pressure of the solid-state battery is 3-10 MPa, and low-pressure working can be achieved.

The invention belongs to the technical field of solid-state batteries, and particularly discloses an active halide solid-state electrolyte material and a preparation method and application thereof, the active halide solid-state electrolyte material comprises an active halide solid-state electrolyte represented by the following formula: xLia A.MyN (1-y) B (ym + n-yn), and carrying out solid-phase reaction on the LiaA and the MBm or carrying out solid-phase reaction on the LiaA, the MBm and the NBn in an inert atmosphere to obtain the active halide solid electrolyte. The active halide solid electrolyte material has relatively high ionic conductivity, can be used as an electrolyte material, can also be used as an electrolyte additive self-sacrifice material to be applied to an electrolyte layer, can also be applied to a positive electrode of a solid-state lithium ion battery to provide capacity for the battery, and is beneficial to improving the energy density of the solid-state battery.

The invention belongs to the technical field of lithium metal solid-state batteries, and discloses a method for modifying the performance of a solid-state lithium ion battery under the induction of a high-voltage electric field, which comprises the following steps: carrying out polarization pretreatment on solid-state electrolyte matrix powder in a 1-5kV high-voltage electric field for 1-5 hours; the obtained independent solid electrolyte is placed in a 5-10 kV high-voltage electric field again for polarization treatment for 1-5 h; and assembling the battery by adopting the independent solid electrolyte subjected to high-voltage electric field polarization treatment. Solid electrolyte matrix powder is pretreated by a high-voltage electric field, dissociation of a lithium salt is promoted through the electrostatic force effect between a monomer and the lithium salt, and more free lithium ions are obtained to promote ion transmission in the solid electrolyte; and then, the finally prepared independent solid electrolyte is subjected to reversible high-voltage electric field polarization, so that conduction of lithium ions in the independent solid electrolyte is promoted, and the performance of the solid-state lithium metal battery is improved. In general, the invention provides a novel and simple method for modifying the performance of the solid-state lithium ion battery through high-voltage electric field induction.

The invention discloses a high-flux interface modification method of an oxide-based all-solid-state battery and a lithium ion battery, and belongs to the technical field of solid-state lithium ion batteries. The method comprises the following steps: mixing LTFSI, PVDF-HFP, m-fluorobenzamide and LLZO powder, and adding dimethylformamide to obtain a mixed raw material; adding an organic wet grinding solvent into the mixed raw material, and carrying out ball milling to obtain interface modification slurry; and coating one side of an LLZO electrolyte sheet with the interface modification slurry, and drying to complete interface modification. According to the interface modification method disclosed by the invention, the solid electrolyte has a lithium-loving property, can be in good contact with a metal lithium negative electrode, and can generate LiFamp through an in-situ reaction; and Li3N fills up interface defects and pores, and meanwhile, lithium dendrite growth and electron permeation can be inhibited, so that the interface structure of the obtained modified layer is stable. In addition, the lithium ion conductivity at the interface is further improved, the lithium ion flux at the interface is enhanced, the cycle life of the lithium battery is prolonged, and the preparation method is simple and suitable for industrial large-scale production.

The invention discloses a composite solid electrolyte material with a core-shell structure and a preparation method and application thereof, and belongs to the technical field of solid-state batteries. The material consists of a solid-state electrolyte core and a halide solid-state electrolyte lithium indium chloride shell layer coated on the surface of the solid-state electrolyte core. The excellent water stability and viscoelasticity of the halide electrolyte are utilized to effectively protect the inner core of the solid electrolyte from being eroded by humid air and improve the interface contact with the electrode; meanwhile, the material cost is greatly reduced by using the cheap solid electrolyte core as the main body. The preparation method adopts a simple ball-milling coating process, and is high in controllability. The composite electrolyte material is excellent in comprehensive performance, low in cost and suitable for preparing the high-performance and high-safety solid-state lithium ion battery.

Provided are a cathode active material for a lithium-ion battery having good battery characteristics, a cathode, a battery, and a method for manufacturing the cathode active material. 【Solution means】 A cathode active material represented by the composition shown in the following formula (1), Li a Ni b Co c Mn d Ta e O f (1) (In formula (1), 1.0 ≤ a ≤ 1.07, 0.8 ≤ b ≤ 0.9, b + c + d + e = 1, 1.8 ≤ f ≤ 2.2, 0.001 ≤ e / (b + c + d + e) ≤ 0.005.) Regarding the magnitudes of the coefficient of variation CV1, which is the value obtained by dividing the standard deviation of the average Ta element concentration inside the primary particles by the average Ta element concentration obtained by TEM-EDX analysis, and the coefficient of variation CV2, which is the value obtained by dividing the standard deviation of the average Ta element concentration at the grain boundaries of the primary particles by the average Ta element concentration at the grain boundaries of the primary particles, CV2 > CV1, and the average Ta element concentration at the grain boundaries obtained by TEM-EDX analysis is higher than the Ta element concentration of the cathode active material for a lithium-ion battery analyzed by ICP, a cathode active material for a lithium-ion battery.

The invention discloses a preparation method of a composite oxide solid electrolyte, a current collector and a diaphragm, the composite oxide solid electrolyte comprises Li1. 3Al0. 3Ti1.7 (PO4) 3 and Li7La3Zr2O12, the preparation method comprises the following steps: adding LATP and LLZO into a planetary ball mill containing zirconium oxide and ethanol according to parts by mass for ball milling; drying and sanding; high-temperature sintering is conducted, and the sintering temperature is 800-1100 DEG C. In the preparation process of the composite solid electrolyte, the sintering temperature is lower than that of other types of solid electrolytes, and the composite solid electrolyte has higher ionic conductivity and lower electronic conductivity. When the microporous foil is used as the composite solid electrolyte, the surface of the microporous foil is coated with the composite solid electrolyte, so that the rate capability of the solid-state lithium ion battery can be remarkably improved. The composite solid-state electrolyte is coated on a current collector and a diaphragm, so that the safety performance of the solid-state lithium ion battery can be obviously improved.

The invention belongs to the technical field of solid-state batteries, and provides a lithium-ion solid-state electrolyte and a preparation method and application thereof. The electrolyte comprises a polymer matrix, a lithium salt and a polar organic compound, the polymer matrix includes a first monomer and a second monomer. The preparation method comprises the following steps: mixing a lithium salt and a polar organic compound to obtain a eutectic mixture; mixing a first monomer and a second monomer with the eutectic mixture to obtain a precursor solution; and coating a mold with the precursor solution, and curing. The invention also discloses a solid-state lithium ion battery comprising the electrolyte. The lithium ion solid electrolyte disclosed by the invention is high in room-temperature ionic conductivity, excellent in stretchability, high in breaking strength and tensile elongation and incombustibility. And by introducing the composite material into a porous electrode and tightly combining the composite material with active material particles in the electrode, the problem of stress failure of the electrode under low stacking pressure is solved, and good cycling stability of the all-solid-state battery under the low stacking pressure or even under the condition that no external pressure is applied is realized.

The application discloses a high lithium ion conductivity flame-retardant interface modifier and a preparation method thereof. The material is synthesized by one-pot one-step reaction of phosphorus oxychloride, diamine and alcohol ether compound, and is used in combination with lithium salt to form a flame-retardant interface modifier with high lithium ion conduction function. The molecular structure is rich in ether bonds, which can effectively coordinate with lithium ions, promote the efficient migration of lithium ions at the electrode interface, and significantly improve the cycle stability and rate performance of the solid-state battery. At the same time, the nitrogen and phosphorus elements introduced in the material endow it with excellent flame-retardant properties, which helps to improve the safety of the battery system. In addition, the modifier has good flowability and wettability, which can enhance the interface compatibility between the components in the solid-state battery. The preparation process of the application is simple, controllable, reproducible and low in cost, and is suitable for interface modification of solid-state lithium ion batteries, and has important prospects for promoting the development of high-safety, high-energy-density and low-cost solid-state batteries.

The invention discloses a solid-state lithium ion battery and a negative electrode manufacturing method thereof. The solid-state lithium ion battery comprises a solid-state electrolyte and a negative electrode, the negative electrode is on a surface of the solid electrolyte and contains a lithium metal chloride. The negative electrode is provided with an alloy and an artificial solid electrolyte interface layer at the same time, so that the junction between the solid electrolyte and the negative electrode has better wettability.

To provide a novel positive electrode material capable of imparting excellent battery capacity and cycle stability to an all-solid-state lithium ion battery, a positive electrode having the positive electrode material, and a method for manufacturing the same.SOLUTION: The present invention relates to a positive electrode material for an all-solid-state lithium ion battery, the positive electrode material includes at least an electrolyte particle, the electrolyte particle includes a polyether block amide copolymer and a lithium salt. The positive electrode material according to the present invention can provide the all-solid-state lithium ion battery with excellent battery capacity and cycle stability.SELECTED DRAWING: None

The invention provides a preparation method and application of an all-solid-state lithium ion battery, the all-solid-state lithium ion battery comprises a positive electrode, a negative electrode and a solid electrolyte, and the preparation method comprises the following steps: adding an interface modifier into raw materials of the positive electrode and / or the solid electrolyte, the fluoro anhydride is selected from at least one of difluoroacetic anhydride, trifluoroacetic anhydride, pentafluoropropionic anhydride or heptafluorobutyric anhydride. According to the preparation method and application of the all-solid-state lithium ion battery provided by the invention, the interfacial compatibility of the solid electrolyte with the positive electrode and the negative electrode can be remarkably improved, and the cycle performance of the high-voltage all-solid-state lithium ion battery is improved.

The invention relates to the technical field of solid-state lithium ion battery electrode materials, in particular to a negative electrode plate as well as a preparation method and application thereof. A first laminated structure of the negative pole piece comprises a current collector, an amorphous carbon material layer, a metal lithium layer, a silicon material layer and a lithium alloy layer which are sequentially laminated; the second laminated structure comprises a current collector, a metal lithium layer, an amorphous carbon material layer, a silicon material layer and a lithium alloy layer which are sequentially laminated. According to the negative pole piece, two equivalent laminated structure arrangement modes are provided, an amorphous carbon layer is used as a buffer matrix, a metal lithium layer compensates irreversible capacity, a silicon layer is used as a capacity main body, and a lithium alloy layer is used as an interface stabilizing and dendritic crystal resisting functional layer, so that partition collaboration and interface stress regulation and control of functional components are realized; therefore, the overall volume expansion of the electrode is remarkably inhibited while high specific capacity is ensured, the first-week coulombic efficiency is improved, lithium dendrite growth is effectively prevented, the structural stability of the negative electrode is enhanced, and the cycle life of the negative electrode is prolonged.

The invention discloses a modified silicon-carbon negative electrode material, a negative electrode plate, a preparation method of the negative electrode plate and a solid-state lithium ion battery, and relates to the technical field of solid-state lithium ion batteries. The preparation method of the modified silicon-carbon negative electrode material comprises the following steps: mixing a silicon-carbon negative electrode material, an amine compound and ethanol according to a mass ratio of 1: (5-10): (5-10), and then sequentially carrying out ball milling, filtering and drying to obtain the modified silicon-carbon negative electrode material, wherein the technological parameters of the ball milling are as follows: the rotating speed is 190-400r / min, the time is 1440-1600min, and the ball-to-material ratio is (10-30): 1. The amino group and the hydroxyl group are grafted on the surface of the silicon-carbon negative electrode material through ball milling, and the amino group and the hydroxyl group have a synergistic effect to form a rapid lithium ion transmission channel, improve the ionic conductivity, form a three-dimensional net-shaped constraint network to buffer the volume change of silicon, and improve the cycling stability and the rate capability of the solid-state lithium ion battery.

Solid-state lithium-ion cells described herein can operate at pressures. In some embodiments, the solid-state lithium-ion cells undergo little or no volume change during cycling. A conditioning process that that significantly improves the performance of a cell at reduced pressures can involve cycling the cell at high pressure.