Lithium polyacrylate, preparation method and uses thereof, and lithium ion battery

Abstract

The invention relates to a lithium polyacrylate, a preparation method and uses thereof, and a lithium ion battery. The preparation method comprises: taking polyacrylic acid having a molecular weight of 200000-600000, and carrying out a mixing reaction on the polyacrylic acid and lithium hydroxide to obtain the lithium polyacrylate. According to the invention, the lithium polyacrylate used as the lithium-rich manganese-based lithium ion battery binder, the preparation method and the uses thereof are provided, and the lithium polyacrylate preparation method is simple, is suitable for industrialproduction, and has outstanding advantages in the improvement of the performances of lithium-rich manganese-based lithium ion batteries.

Description

technical field [0001] The invention relates to a lithium battery processing and manufacturing technology, in particular to lithium polyacrylate, its preparation method and application, and a lithium ion battery using lithium polyacrylate. Background technique [0002] In lithium-ion batteries, graphite has been widely used as a traditional negative electrode material, and some negative electrode materials with high energy density have been extensively studied, but the positive electrode materials that match the negative electrode materials are limited by the energy density. At present, many researchers are focusing on the positive electrode materials of lithium-ion batteries. Lithium-rich manganese-based materials (xLi 2 MnO 3 ·(1-x)LiMO 2 ) has attracted attention due to its high specific capacity, high energy density, and environmental friendliness, however, Li-rich Mn-based materials have limited their wide application due to the phenomenon of voltage drop. The voltag...

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Problems solved by technology

The research on the electrolyte needs to involve the synthesis of a variety of organic materials and the ratio of the materials is very strict. The operation process is relatively cumbersome, and it is not suitable for large-scale applications. Most of them are only used in small-scale research in the laboratory.

For the research on the structure of lithium-rich manganese-based materials, most of them need to use large-scale instruments and equipment, the cost is relatively high, and at the same time, researchers are required to have a high theoretical level, so it is not conducive to the promotion and application of materials on a large scale

In addition to the above research on the electrolyte and material structure, some researchers are also engaged in the research of adhesives. For example, Wu Feng's research group at Beijing Institute of Technology mixed PAN and PVDF in a certain proportion and used them in lithium-ion batteries. Although it has a certain inhibitory effect on the crushing and pulverization of materials, it does not involve the corrosion of electrolyte and other issues, and PAN and PVDF are non-conductive polymer materials, which are not conducive to excessive use in lithium-ion batteries. Transport of lithium ions and electrons

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