Method for preparing thin-layer lithium metal anode for all-solid-state lithium-ion battery based on PVD

Abstract

The invention discloses a method for preparing a thin-layer lithium metal anode for an all-solid-state lithium-ion battery based on a PVD. The method comprises the following steps: (1) cleaning a current collector copper foil surface for a commercial lithium-ion battery anode, and putting the current collector copper foil surface into a physical vapor deposition chamber as a deposition base; (2) preparing target materials from a to-be-deposited lithium metal source and a protection layer metal source respectively, and putting the target materials into the chamber as a deposition layer metal source; and (3) setting physical vapor deposition parameters, and sequentially depositing a lithium metal anode material deposition layer and a protective metal layer on the copper foil surface by a PVD method in a vacuum state, and controlling the thickness of the deposition layer by deposition time. A thin-layer lithium metal anode material deposited on the anode current collector copper foil surface is prepared by the physical vapor deposition (PVD) method; and the thin-layer metal protection layer is deposited on the surface of the thin-layer lithium metal anode material. According to the method, the safety of the all-solid-state lithium-ion battery in the production process can be greatly strengthened; and the limit energy density of the all-solid-state lithium-ion battery is improved.

Description

technical field [0001] The invention relates to a lithium-ion battery, in particular to a method for preparing a thin-layer metal lithium-based negative electrode for an all-solid-state lithium-ion battery by using PVD. Background technique [0002] All-solid-state lithium-ion batteries are the latest field in the development of lithium-ion batteries. It is also composed of positive and negative electrodes and electrolytes. It is simpler in structure than traditional lithium-ion batteries. The electrolytes are all made of solid materials. The solid electrolyte not only conducts lithium ions, but also acts as a separator. Lithium ions intercalate and extract between the positive and negative electrodes through the solid electrolyte, and exchange charges with electrons, thereby realizing the conversion of electrical energy and chemical energy. At present, metal lithium is mostly used as the negative electrode of all-solid-state lithium-ion batteries, and the theoretical capac...

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Problems solved by technology

At present, metal lithium is mostly used as the negative electrode of all-solid-state lithium-ion batteries, and the theoretical capacity of metal lithium reaches 3860mAhg -1 , has good interface compatibility with solid-state electrolytes, but metal lithium is extremely active, and there is a risk of fire and explosion when it comes into contact with air. The battery assembly process must be strictly controlled in an oxygen-free and water-free environment; in addition, the metal lithium foil used in the market is relatively thick. Large, which is not conducive to the improvement of the limit energy density of all-solid-state lithium-ion batteries, and limits the industrialization process of large-scale all-solid-state lithium-ion batteries

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