Preparation of argyrodite type solid electrolyte and application of argyrodite type solid electrolyte in all-solid-state battery

A solid-state electrolyte and all-solid-state battery technology, applied in the direction of non-aqueous electrolyte batteries, electrolyte battery manufacturing, solid electrolytes, etc., can solve the problems of electrolyte conductivity decline, difficulty in control, and difficult to achieve the effect of protection, so as to improve the ion conductivity efficiency, good chemical stability, and the effect of improving cycle stability

Pending Publication Date: 2021-12-31
SHANGHAI FIRM-LITHIUM NEW ENERGY TECH CO LTD
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Problems solved by technology

But its disadvantage is that the P-S bond of the sulfide solid electrolyte is very difficult to control through the oxidation process of the external oxide, too little P-S bond oxidation is difficult to achieve the protective effect, and too much P-S bond oxidation will lead to electrolyte conductivity. A sharp decline

Method used

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  • Preparation of argyrodite type solid electrolyte and application of argyrodite type solid electrolyte in all-solid-state battery
  • Preparation of argyrodite type solid electrolyte and application of argyrodite type solid electrolyte in all-solid-state battery
  • Preparation of argyrodite type solid electrolyte and application of argyrodite type solid electrolyte in all-solid-state battery

Examples

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Embodiment 1

[0042] This example involves Li 6.4 P 0.6 sn 0.2 In 0.2 S 5 (BH 4 ) argentite type solid state electrolyte and preparation thereof; comprising the steps of:

[0043] (1) determine that the value of a is 6.4, the Li of appropriate molar ratio 2 S, P 2 S 5 , SnS 2 、In 2 S 3 、LiBH 4 Mixing and high-energy planetary ball milling, the rotation speed and time of high-energy planetary ball milling are 550rpm and 24h, so as to obtain the initial solid electrolyte material.

[0044] (2) Place 40 mg of the powder obtained in step (1) in a tableting mold with a diameter of 12 mm, and press at 600 MPa to form a solid electrolyte tablet.

[0045] (3) 500 mg of sheet-shaped electrolyte obtained in step (2) is put into a quartz tube under an argon atmosphere, and after vacuuming (~10 –4 Pa) Seal the tube.

[0046] (4) heat-treating the solid electrolyte sheet obtained in step (3) at 550° C. for 12 hours to obtain argentite-type solid electrolyte material.

[0047] (5) the soli...

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Abstract

The invention discloses preparation of argyrodite type solid electrolyte and application of the argyrodite type solid electrolyte in an all-solid-state battery. The general formula of the electrolyte is LiaMQ6-x (BH4) x, M is one or more of Sn, In, P, Si, Ge and As, Q is one or more of O, S, Se and Te, a is greater than or equal to 1 and less than or equal to 9, and x is greater than 0 and less than or equal to 6. The preparation method of the electrolyte comprises the following steps: mixing Li2Q, P2Q5, MQ2 and LiBH4, and carrying out ball milling to obtain an initial solid electrolyte; and further performing heat treatment on the initial solid electrolyte in a vacuum quartz tube to obtain the argyrodite type solid electrolyte. The existence of borohydride ions in the prepared electrolyte is beneficial for improving the conductivity and the stability of the electrolyte. Therefore, the all-solid-state lithium battery based on the electrolyte has high safety, energy density and stability.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and relates to a method for preparing a solid-state electrolyte applied in the field of solid-state batteries, in particular to a sulfur-silver-germanium-type solid electrolyte Li a MQ 6-x (BH 4 ) x (Where M is one or more of Sn, In, P, Si, Ge, As, Q is one or more of O, S, Se, Te, and 1≤a≤9, 0<x ≤6) and its application in all-solid-state batteries. Background technique [0002] Lithium-ion batteries, as an efficient energy storage system, have been widely used in consumer electronics and electric transportation. However, traditional lithium-ion batteries are difficult to meet people's increasing demand for battery energy density, and the frequent fires and explosions of lithium-ion battery-powered vehicles have caused people's concerns about their safety. In view of this, the preparation of all-solid-state batteries by replacing the organic liquid electrolytes in traditional lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525H01M10/058
CPCH01M10/0562H01M10/0525H01M10/058H01M2300/0068Y02E60/10Y02P70/50
Inventor 朱金辉陈振营张希
Owner SHANGHAI FIRM-LITHIUM NEW ENERGY TECH CO LTD
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