A negative electrode structure of a lithium battery and a method for preparing the negative electrode structure

Abstract

The invention relates to the technical field of lithium batteries, in particular to a lithium battery negative electrode structure and a method for preparing the negative electrode structure. The negative electrode structure of the lithium battery of the present invention includes a negative electrode current collector and a negative electrode film formed on the negative electrode current collector. The components of the negative electrode film include lithium, silicon, and carbon, wherein lithium and silicon are embedded in a carbon network structure middle. The negative electrode structure of the lithium battery of the present invention has good structural stability and cycle charge and discharge performance, improves the specific capacity density of the negative electrode, and greatly improves the application performance of the negative electrode of the lithium battery. The method for preparing the negative electrode structure of the lithium battery of the present invention prepares the negative electrode structure of the lithium battery as described above by means of co-evaporation or co-sputtering. When sputtering is required to obtain films with different components, the target can be replaced directly. The process is simple and fast, and the production efficiency is high, which meets the needs of mass production.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery negative electrode structure and a method for preparing the negative electrode structure. 【Background technique】 [0002] In the 1990s, the invention of safe graphite anodes promoted the large-scale application of lithium batteries in personal electronic devices and other fields. By this century, with the advancement of science and technology, the demand for high-end electronic equipment and electric vehicles is increasing, and lithium batteries based on traditional graphite anodes are gradually difficult to meet the demand. Therefore, the development of energy storage systems with higher energy density is imminent. Among the known battery materials, the lithium metal anode has attracted extensive attention from researchers in related fields because of its large capacity of 3860mAh*g-1 and the most negative potential (-3.040V vs. SHE). [0003] Howe...

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Problems solved by technology

[0003] However, the metal lithium negative electrode will have the problem of dendrite growth during the charging process and the differentiation of the metal lithium negative electrode during the cycle.

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