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

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 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.

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.

The application discloses a method for improving the performance of oxide solid electrolyte by calcium doping, and belongs to the technical field of solid-state batteries. The method comprises the following steps: mixing raw materials containing a calcium source, a sodium source, a rare earth source and a phosphorus source to obtain a precursor; sintering the precursor to obtain a calcium-doped sodium superionic conductor precursor; and performing ion exchange on the precursor and a lithium salt to obtain a calcium-doped oxide solid electrolyte with a chemical formula of Li 3+ x La 1‑x Ca x (PO4)2, and 0 < x <= 0.1. By partially replacing lanthanum ions with calcium ions, lithium vacancies are introduced, the crystal lattice is relaxed, and the lithium ion migration path is optimized by using the charge compensation mechanism, so that the room-temperature ionic conductivity of the material is significantly improved. The method has low raw material cost, simple process and strong universality, can be expanded to various oxide solid electrolyte systems such as NASICON and garnet, and has good application prospect in the field of solid-state lithium ion batteries.

An assembly of solid lithium-based anodes for forming a lithium-ion battery. The anodes are formed with a fibrous ceramic or polymer framework containing open spaces and an active surface material with lithophilic properties. The open spaces within the fibrous framework and the lithophilic coatings deposited on the framework surface allow for the free transport of solid lithium ions into the anodes. In the solid state, lithium batteries can achieve higher capacity per weight, charge faster, and be more resistant to handling and extreme temperatures. A method for manufacturing a solid-state lithium battery having such an anode.

The application relates to a sulfide solid electrolyte for inhibiting dendrite growth, a preparation method and application, and belongs to the technical field of lithium ion solid-state batteries. The chemical general formula of the sulfide solid electrolyte is aMCl b -Li 7‑c PS 6‑c X c wherein M is one or more of Mg, Ca, Sr, Ba, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er and Tm, MCl b accounts for 1-40 wt.% of the whole electrolyte, X is one or more of Cl, Br and I, and 1<=c<=2. The sulfide solid electrolyte has high room-temperature ionic conductivity and good dendrite inhibition capacity, can greatly reduce the short-circuit risk of prepared lithium ion batteries in the process of high current density and long-time circulation, and has simple synthesis method, can be used for preparing full-solid-state lithium ion batteries, and has good practicability.

The present application relates to a modified solid-state electrolyte material, a preparation method thereof and a full solid-state lithium ion battery, and belongs to the technical field of full solid-state lithium ion batteries.The modified solid-state electrolyte material comprises solid-state electrolyte particles and a lithium iodide and ethyllithium complex coating layer coated on the surface of the solid-state electrolyte particles.The preparation method comprises coating LiI on the surface of the solid-state electrolyte particles to obtain LiI-coated solid-state electrolyte particles;mixing the LiI-coated solid-state electrolyte particles with C2H5Li, and then complexing by heating to form a lithium iodide and ethyllithium complex coating layer on the surface of the solid-state electrolyte particles, thereby obtaining the modified solid-state electrolyte material.The modified solid-state electrolyte material can significantly improve the compatibility of the solid-state electrolyte and the pole piece, and has low cost.

This invention relates to the field of lithium-ion battery technology, specifically to a eutectic-derived solid electrolyte, its preparation method, and a lithium-ion battery. The electrolyte is formed by mixing a eutectic bis(fluorosulfonyl)imide alkali metal salt with a metal oxide to form a heterojunction. The heterojunction interface exhibits Lewis acid-base interactions, including ternary bis(fluorosulfonyl)imide alkali metal salt-metal oxide electrolytes and binary bis(fluorosulfonyl)imide alkali metal salt-metal oxide electrolytes. The electrolyte is a solid powder at room temperature, with a low melting point, a low glass transition temperature, and a room temperature ionic conductivity of 0.07~0.1 mS·cm. ‑1 It exhibits an electrochemical stability window of -0.2 to 5.9 V and strong compatibility with the electrode interface. When used in solid-state lithium-ion batteries, the electrolyte demonstrates excellent cycle stability, high coulombic efficiency, and combines flame retardancy with environmental friendliness, showing great potential for application in energy storage.

The application relates to the field of lithium batteries, and discloses a sulfide solid electrolyte film and a solid lithium ion battery, the sulfide solid electrolyte film comprises a polymer film with a three-dimensional skeleton structure and a sulfide solid electrolyte material forming a continuous phase; the ion conductivity of the sulfide solid electrolyte film is > 10 ‑4 S / cm, and the thickness of the sulfide solid electrolyte film is <= 40 mu m; the sulfide forms a continuous phase in the polymer film by using a flexible polymer film as a skeleton support, the ion conductivity of the sulfide solid electrolyte film is ensured, and the thickness of the solid electrolyte film is greatly reduced.

This invention relates to the field of lithium-ion battery technology, and more particularly to a solid electrolyte ceramic sheet and a solid lithium-ion battery. The solid electrolyte ceramic sheet is a Zr / Ge co-doped LATP ceramic sheet, comprising a ceramic substrate and an inorganic interface layer disposed on the surface of the ceramic substrate. The inorganic interface layer is disposed on at least one side surface of the ceramic substrate facing the negative electrode. The general chemical formula of the ceramic substrate is Li. 1+x Al x Ti 2‑x‑y1‑y2 Zr y1 Ge y2 (PO4)3, where x = 0.25–0.40, y1 = 0.03–0.15, and y2 = 0.03–0.10. This invention addresses the core bottlenecks of LATP-based solid electrolytes by synergistically optimizing bulk ion transport and stabilizing interfacial chemistry, resulting in significant improvements in ionic conductivity, interfacial impedance, cycle stability, and rate performance of the prepared solid-state lithium-ion batteries.

A composite solid-state polymer electrolyte membrane and its preparation method, and a solid-state lithium-ion battery, are disclosed. The preparation method of the composite solid-state polymer electrolyte membrane includes: chemically modifying the surface of an inorganic filler using a boron-containing silane coupling agent to anchor boron-containing groups onto the surface of the inorganic filler, thus preparing a modified filler; dissolving polyethylene oxide, lithium salt, hydrogen-extractable photoinitiator, and multifunctional unsaturated monomer in an organic solvent to prepare a precursor solution; dispersing the modified filler in the precursor solution to prepare a composite slurry; and forming the composite slurry into a film, followed by ultraviolet light irradiation to initiate a cross-linking reaction, forming a three-dimensional cross-linked network, thus preparing the composite solid-state polymer electrolyte membrane. The preparation method of this application, by covalently anchoring boron-containing groups and constructing a three-dimensional cross-linked network through a hydrogen extraction mechanism, can reduce additive migration and loss, improve membrane mechanical strength, and generate a boron-rich inorganic interface membrane in situ under high pressure, which is beneficial for broadening the electrochemical window and improving battery cycle stability.

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.

This invention proposes an all-solid-state lithium-ion battery and its application. The all-solid-state lithium-ion battery includes: a positive electrode; a modified lithium-based composite negative electrode, the modifying material including metal fluorides; and a solid electrolyte membrane disposed between the positive electrode and the modified lithium-based composite negative electrode, wherein the solid electrolyte membrane includes a sulfide electrolyte with the chemical formula Li. a P 1‑b M b S c O d X e , of which 5

The utility model relates to solid -state lithium ion battery detection technical field, and disclose a kind of solid -state lithium ion battery detection system, including detection host computer and the battery compartment for placing solid -state lithium ion battery, the power interface for maintaining the charge-discharge state of solid -state lithium ion battery in battery compartment is equipped on the detection host computer, main controller is equipped in the detection host computer, the main controller includes pressure unit and temperature unit, in the utility model, modular pressure unit, temperature unit are handled to battery compartment with pressure, temperature data, wherein pressure unit, temperature unit can be independently enabled, to measure the real temperature of the battery under test in real time accurately, realize accurate temperature control, improve the authenticity of the data of experimental process, respectively independent and centralized integrated pressure unit, temperature unit can also realize the pressure change in the charge-discharge process under different temperatures in the experimental process of battery compartment, to make the experimental application scene more rich.

The application relates to the technical field of solid-state lithium ion batteries, and discloses a dual-ceramic electrolyte and a ternary NCM solid-state battery containing the dual-ceramic electrolyte, the battery is assembled from an NCM ternary / LATP-LLZTO composite pole piece and an artificial graphite negative pole piece, the composite pole piece is directly coated with a LATP-LLZTO dual-ceramic electrolyte slurry on an NCM ternary positive pole piece to be compacted to obtain the battery, wherein the LATP and the LLZTO are mixed in a weight ratio of 3:2 to 2:3, are directly coated on the NCM ternary positive pole piece to form an integrated composite pole piece, and are finally assembled into a soft package battery. + The battery total internal resistance is less than or equal to 2.55 ohms, the Li ‑ diffusion coefficient is greater than or equal to 6.72*10 0 cm²s ‑ ¹, the discharge capacity is greater than or equal to 181 mAh g ‑ ¹ at 0.1 C, the capacity retention rate is greater than 68% after 800 cycles, the capacity retention rate reaches 54.6% at 2 C, and there is no thermal runaway phenomenon after mechanical damage. The application solves the problems of high interface resistance and fast capacity attenuation of existing solid-state batteries, has high specific capacity, long cycle life and high safety, the preparation method is controllable and easy to scale, and is suitable for energy storage scenes such as electric vehicles.

The present application belongs to the field of solid-state lithium ion battery interface engineering and thin film preparation technology, and provides a gradient LiF / Li3N artificial SEI film, a solid-state electrolyte-SEI-pole piece composite material and a solid-state lithium ion battery and preparation thereof. The gradient LiF / Li3N artificial SEI film comprises a bottom layer, an intermediate transition layer and a surface layer which are sequentially stacked; the bottom layer is a Li3N layer; the intermediate transition layer is a layer with gradient change in Li3N and LiF content; the atomic ratio of N and F in the intermediate transition layer gradually changes from 80:20 to 20:80 at a constant speed; one side of the intermediate transition layer with an atomic ratio of N and F of 80:20 is in contact with the bottom layer; and the surface layer is a LiF layer. The gradient LiF / Li3N artificial SEI film has excellent high ionic conductivity and stability, and solves the contradiction between high ionic conductivity and stability.

This invention discloses an antioxidant cathode adhesive containing hindered amines, as well as a battery cathode and a solid-state lithium-ion battery, belonging to the field of lithium battery technology. The adhesive is a random copolymer of acrylonitrile monomer / methyl methacrylate monomer, a hindered amine monomer, and 2-(2-ethoxyethoxy)ethyl acrylate. The hindered amine monomer can remove singlet oxygen generated during the phase transition of the cathode material structure during cycling, inhibiting electrolyte oxidative decomposition during cycling. Acrylonitrile / methyl methacrylate improves adhesion and stabilizes the surface structure of the cathode active material. The addition of 2-(2-ethoxyethoxy)ethyl acrylate improves the polymer's flexibility and buffers stress generated by volume changes during long-term charge and discharge. When this adhesive is applied to a solid-state battery, it can effectively capture singlet oxygen, suppress interfacial side reactions, and effectively improve the cycle stability of the high-voltage cathode battery.

The application discloses a single-crystal NCM811@ZrO2 / Li3VO4 core-shell double-coated structure material and a preparation method and application thereof in a full-solid-state lithium ion battery, uses single-crystal NCM811 as an inner core, and obtains NCM811@ZrO2 / Li3VO4 with a core-shell structure by mixing coating ZrO2 and Li3VO4 on the outer layer, so that a frame is formed on the surface of NCM811, the structural change of the ternary material is effectively relieved, a buffer layer is formed between the sulfide electrolyte and the ternary material, the decomposition of the material is inhibited, the stability of the composite material is ensured, and the cycle stability of the battery is significantly improved, and the material is applied to a full-solid-state lithium ion battery positive active material, and compared with a single NCM811 solid-state lithium ion battery, the material has good cycle performance and rate performance.

This utility model provides a solid-state lithium-ion battery module, relating to the field of lithium-ion battery module technology. It includes a first connecting plate and a battery module body. A movable component is disposed inside the first connecting plate. The movable component includes a second connecting plate. Multiple evenly arranged first circular holes are formed on both sides of the outer surface of the second connecting plate. Second circular holes are formed on both sides of the outer surface of the first connecting plate. Sliding shafts are slidably connected to the inner walls of two of the second circular holes. Springs are disposed on the outer surfaces of two of the sliding shafts. Fixed shafts are fixedly connected to both sides of the outer surface of the first connecting plate. In this utility model, by setting up the movable component and moving the second connecting plate, the device protects and structurally supports solid-state lithium-ion battery modules of different sizes, thereby improving the passability of the battery packaging box of the solid-state lithium-ion battery module.