Sulfide solid electrolyte of three-layer core-shell structure, preparation method thereof and all-solid-state battery

Abstract

The invention discloses a sulfide solid electrolyte of a three-layer core-shell structure, and relates to the field of all-solid-state batteries. From inside to outside, the Li-Argyrodite solid electrolyte or LGPS-type solid electrolyte is adopted as a nuclear body, the Li-P-S is adopted as an intermediate layer, and the Li-P-S-O is adopted as a shell layer. In this way, the stability of the sulfide solid electrolyte to lithium metal can be guaranteed. Meanwhile, the possibility of reaction between the sulfide solid electrolyte and water vapor in air can be reduced. The probability that the sulfide solid electrolyte is oxidized when making contact with the positive electrode material is reduced. Moreover, the preparation method is relatively simple and is suitable for large-scale production. In addition, the electrical performance of the all-solid-state battery can be effectively improved by combining the all-solid-state battery with a metal lithium negative electrode and a high-voltage positive electrode.

Description

technical field [0001] The invention relates to the field of all-solid-state batteries, in particular to a three-layer core-shell structure sulfide solid electrolyte, a preparation method thereof, and an all-solid-state battery. Background technique [0002] In the 1990s, Japan's Sony Corporation first successfully launched commercial lithium-ion batteries. Lithium-ion batteries have the advantages of high power density, high voltage, environmental friendliness, and small self-discharge, and are widely used in portable electronic devices such as mobile phones and notebook computers and electric vehicles. After years of development, the industry has formed a complete industrial chain with a high degree of professional segmentation. The application field of lithium-ion batteries has also developed from the initial small digital electronic products to large-scale energy storage products such as electric vehicles and energy storage power stations. According to the data, the to...

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Problems solved by technology

In September 2016, the Samsung Note7 mobile phone battery spontaneously ignited and exploded due to design problems, causing bodily harm to users

[0013] Aiming at the three problems of the above-mentioned Li-Argyrodite and LGPS-type sulfide electrolytes: unstable to metal lithium; unstable in dry air; poor contact stability with high-voltage positive electrode materials

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