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All-solid-state battery and preparation method thereof

An all-solid-state battery and solid-state electrolyte technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of low battery cycle performance and rate performance, battery capacity attenuation, and low energy density, so as to improve cycle performance and rate performance, reducing interface resistance, and improving energy density

Active Publication Date: 2019-08-13
桑德新能源技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention provides TiS 2 An all-solid-state battery that is a positive electrode active material, to at least solve the problems of high interface impedance of all-solid-state batteries in the prior art, low battery cycle performance and rate performance, and low energy density of all-solid-state batteries in the prior art
[0012] The invention provides a method for preparing an all-solid-state battery coated with a slurry and heated and pressurized under vacuum conditions, which at least solves the problem that the all-solid-state battery prepared by the powder pressing method in the prior art cannot be held by a pressurized mold. The problem of rapid battery capacity fading, and the problem of low energy density due to the thick solid electrolyte layer

Method used

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  • All-solid-state battery and preparation method thereof
  • All-solid-state battery and preparation method thereof

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preparation example Construction

[0065] According to another aspect of the present invention, a method for preparing an all-solid-state battery is provided, the method is carried out in a vacuum or an inert atmosphere, comprising:

[0066] Step S1: Put TiS 2 Dissolving the ion-conducting agent and the binder in a solvent to obtain a positive electrode slurry, wherein the ion-conducting agent is a sulfide, coating the positive electrode slurry on the positive electrode current collector and drying it to obtain a positive electrode sheet,

[0067] Step S2: Dissolving the solid electrolyte and the binder in a solvent to prepare a solid electrolyte slurry, wherein the solid electrolyte is a sulfide, and the solid electrolyte is coated on the positive electrode sheet and dried to form a solid electrolyte layer;

[0068] Step S3: After placing the negative electrode sheet on the solid electrolyte layer, heat and press in vacuum to obtain an all-solid-state battery.

[0069] According to the preparation method of t...

Embodiment 1

[0119] This embodiment provides a method for preparing an all-solid-state battery.

[0120] First step S1: in an argon atmosphere, the TiS 2 Dissolving the ion-conducting agent and the binder in a solvent to prepare a positive electrode slurry, wherein the ion-conducting agent is a sulfide, coating the positive electrode slurry on the positive electrode current collector and drying to prepare the positive electrode sheet.

[0121] Among them, the ionic conductor is Li 3 P.S. 4 , The binder is nitrile rubber, and the solvent is tetrahydrofuran.

[0122] In an argon glove box, the TiS 2 , Li 3 P.S. 4 After the powder is mixed according to the mass ratio of 1:1.5, it is added to tetrahydrofuran dissolved with nitrile rubber, and the positive electrode slurry is obtained after fully stirring and mixing, wherein the mass of nitrile rubber accounts for 1% of TiS 2 and Li 3 P.S. 4 6% of the total mass, wherein the mass of the solvent is 20 times that of the nitrile rubber.

...

Embodiment 2

[0131] Other parameters of this embodiment and embodiment 1 are all the same, except TiS 2 The mass ratio to the ion-conducting agent is 1:0.3.

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Abstract

The invention discloses an all-solid-state battery and a preparation method thereof. The all-solid-state battery comprises a positive electrode plate, a solid electrolyte layer and a negative electrode plate, wherein the positive electrode plate comprises a current collector and a positive electrode material layer. The positive electrode material layer comprises a positive electrode active material and an ionic conductive agent, wherein the positive electrode active material is TiS2, and the ionic conductive agent is sulfide. The solid electrolyte layer comprises solid electrolyte which is sulfide. The preparation method comprises the following steps: S1, preparing the positive electrode plate; S2, preparing the solid electrolyte layer; S3, placing the negative electrode plate in the solidelectrolyte layer, and carrying out vacuum heating and pressurization to obtain the all-solid-state battery. According to the invention, the all-solid-state battery prepared through the method disclosed by the invention are high in energy density and good in cycle performance and rate capability, and the battery capacity is kept good when charging and discharging are carried out under a self-sustaining voltage.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an all-solid-state battery and a preparation method thereof. Background technique [0002] In existing all-solid-state batteries, oxides are generally used as positive electrode active materials; sulfides with high deformation and high conductivity are used as solid-state electrolytes. [0003] But it has the following technical problems: [0004] (1) There is a potential difference between the positive electrode active material of the oxide and the solid electrolyte of the sulfide, which is easy to generate a space charge layer, so that the interface impedance between the positive electrode sheet and the solid electrolyte layer is large, which in turn leads to the cycle performance of the all-solid-state battery and Poor magnification performance. [0005] (2) The theoretical capacity of the positive active material of commonly used oxides is low (such as: LiCoO 2 The theor...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/0525H01M10/058
CPCH01M4/364H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 周美丽陈渊倪海芳
Owner 桑德新能源技术开发有限公司
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