Lithium ion battery anode material based on metal oxide and preparation method thereof

Abstract

The invention relates to a lithium ion battery anode material based on a metal oxide and a preparation method thereof. The preparation method comprises the following steps: firstly, taking hydroxyethyl methacrylate, [alpha]-bromo isobutyryl bromide and mercaptoethanol as raw materials to react to generate hydroxyl-terminated hyperbranched polyacrylate; then enabling the hydroxyl-terminated hyperbranched polyacrylate to react with aluminum nitrate nonahydrate and copper nitrate hexahydrate to prepare aluminum and copper oxide microspheres; mixing and ball-milling the aluminum and copper oxide microspheres and lithium hydride in a carbon dioxide gas atmosphere, and performing heating to release hydrogen, so as to obtain pretreated aluminum and copper oxide microspheres; and finally, using the pretreated aluminum and copper oxide microspheres and 2-vinylthiophene as raw materials, performing a polymerization reaction, obtaining the lithium ion battery negative electrode material, and therefore, the initial coulombic efficiency is high, and the cycling stability is good.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a lithium ion battery negative electrode material, in particular to a metal oxide-based lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Traditional energy sources such as coal, oil and natural gas are non-renewable energy sources and are increasingly exhausted. However, with economic development and social progress, energy demand is increasing. These traditional energy sources can no longer meet the needs of human society development. In recent years, people have been working on how to improve energy efficiency and develop and utilize renewable energy. [0003] Due to the advantages of high energy density, high cycle life, wide operating temperature range, no memory effect, and environmental protection, lithium-ion batteries are widely used in portable electronic devices, electric tools, and electric vehi...

AI Technical Summary

Problems solved by technology

[0006] Metal oxides have high theoretical capacity, high energy density and high safety, and are an ideal negative electrode material for lithium-ion batteries. However, metal oxides tend to form amorphous oxides and SEI films during the first discharge process, and subsequent During the charging process, these amorphous oxides are not all reversible, and the SEI film is also partially decomposed, resulting in a large loss of the first irreversible capacity of the metal oxide, and a low initial Coulombic efficiency. Moreover, the conductivity of the metal oxide is poor. During the process, the conductivity further deteriorates. At the same time, most of the metal oxide particles react with lithium to undergo a large volume expansion, resulting in a large stress, so that the active particles are gradually pulverized during the cycle and lose electrical contact with the current collector. , for transition metal oxides, it will also cause the nano-transition metal particles to agglomerate to form large particles and lose electrochemical activity, which seriously affects the cycle stability.

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