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Solid-state electrolyte, preparation method thereof and solid-state lithium battery

A solid electrolyte, solid electrolyte technology, used in non-aqueous electrolyte batteries, solid electrolytes, lithium batteries and other directions

Active Publication Date: 2020-04-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem of high interfacial impedance between the positive electrode active material and the electrolyte in the prior art, and provide a kind of solid electrolyte and its preparation method and solid lithium battery

Method used

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  • Solid-state electrolyte, preparation method thereof and solid-state lithium battery
  • Solid-state electrolyte, preparation method thereof and solid-state lithium battery
  • Solid-state electrolyte, preparation method thereof and solid-state lithium battery

Examples

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Embodiment approach

[0067] According to the present invention, the specific preparation method of the solid-state lithium battery in the present invention is not particularly limited, and can be adopted as a conventional preparation method of the solid-state lithium battery in the field. Specifically, according to a preferred embodiment of the present invention: comprising The cell is sealed in the battery casing; the preparation of the cell is a conventional method for preparing a cell in a solid-state lithium battery in the art, and is not particularly limited; it includes first preparing the positive electrode, and then, preferably, on the surface of the positive electrode Prepare a solid electrolyte layer. The method for preparing an inorganic solid electrolyte layer on the surface of the positive electrode includes coating an inorganic solid electrolyte slurry on the surface of the positive electrode and then drying, thereby forming an inorganic solid electrolyte layer on the surface of the po...

Embodiment 1

[0073] This example is used to illustrate the solid electrolyte of the present invention, its preparation method and all-solid-state battery.

[0074] (1) Preparation of sulfide solid electrolyte A

[0075] Will Li 2 S, GeS 2 with P 2 S 5 According to the molar ratio of 5:1:1, in a high-energy ball milling device under the protection of an inert atmosphere, at a temperature of 25 ° C, ball milling at a speed of 400 r / min for 8 hours, and mix evenly to obtain a mixed powder, and mix the powder in Pressed into tablets under a pressure of 10MPa; then the pressed powder tablets were placed in a furnace filled with an inert atmosphere, treated at 550°C for 8h, and then slowly cooled to room temperature to obtain a solid electrolyte A (Li 10 GeP 2 S 12 ) particles;

[0076] figure 1 It's Li 10 GeP 2 S 12XRD pattern of solid electrolyte;

[0077] figure 2 It's Li 10 GeP 2 S 12 The impedance spectrum of the ionic conductivity test of the solid electrolyte at room temp...

Embodiment 2

[0091] This example is used to illustrate the solid electrolyte of the present invention, its preparation method and all-solid-state battery.

[0092] The solid electrolyte is prepared according to the same method as in Example 1, the difference is: in the preparation of the solid electrolyte of the present invention in step (3), the sulfide solid electrolyte A (average particle diameter 2um) and the sulfide solid electrolyte B ( The mass ratio of the amount used (average particle diameter 50nm) is 19:1, and the thickness of the shell layer is about 380nm.

[0093] The result was the battery of this example, designated as S2.

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Abstract

The invention relates to the field of lithium batteries, in particular to a solid-state electrolyte, a preparation method thereof and a solid-state lithium battery. The solid-state electrolyte contains a sulfide solid electrolyte A and a sulfide solid electrolyte B. The ionic conductivity of the sulfide solid electrolyte A is not smaller than 4.0 * 10 <-4> S / cm, and the ionic conductivity of the sulfide solid electrolyte B is not larger than 2.2 * 10 <-4> S / cm. The oxidation resistance of the sulfide solid electrolyte B is superior to that of the sulfide solid electrolyte A. The sulfide solidelectrolyte A and the sulfide solid electrolyte B contained in the solid electrolyte are sulfide solid electrolytes. The lithium ion transmission between the sulfide solid electrolyte A and the sulfide solid electrolyte B is better, better ionic conductivity can be obtained after compounding, elasticity modulus of the sulfide solid electrolyte A and elasticity modulus of the sulfide solid electrolyte B are similar, a better physical contact interface can be obtained between the sulfide solid electrolyte A and the sulfide solid electrolyte B, the solid-state electrolyte is not sensitive to moisture, and the designed solid-state electrolyte is good in air stability and not prone to generating hydrogen sulfide gas.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a solid electrolyte, a preparation method thereof, and a solid lithium battery. Background technique [0002] In order to improve the ion conduction inside the positive electrode of the inorganic all-solid-state battery, it is usually necessary to mix a certain amount of inorganic solid electrolyte inside the positive electrode. The mixed inorganic all-solid electrolyte is an oxide inorganic solid electrolyte or a sulfide solid electrolyte. [0003] The existing technology has the following major disadvantages: if the oxide inorganic solid electrolyte is mixed into the positive electrode, on the one hand, due to the high particle hardness of the oxide inorganic solid electrolyte, it is in rigid contact with the positive active material; on the other hand, its ionic conductivity is relatively low. Low, which leads to the obstruction of ion transport inside the positive electrode, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/052
CPCH01M10/052H01M10/0562H01M2300/0068Y02E60/10
Inventor 谢静郭姿珠马永军历彪
Owner BYD CO LTD