Method for continuously preparing current collector-free silicon-carbon negative electrode paper

Abstract

The invention relates to a method for continuously preparing current collector-free silicon-carbon negative electrode paper, which comprises the following steps: a mixing step: injecting expanded graphite, an auxiliary carbon source and a silicon source into a mixing bin, and mixing to obtain a mixture; a rolling step: injecting the mixed material into a forming cabin, and performing rolling treatment on the mixed material through a rolling device to prepare sheet-shaped silicon-carbon composite electrode paper; and a purification step: transferring the silicon-carbon paper composite electrodepaper into a purification cabin, and removing impurities in the silicon-carbon paper composite electrode paper by adopting a high-temperature and low-pressure purification technology to obtain the current collector-free silicon-carbon negative electrode paper. According to the method, the silicon-carbon negative electrode without the current collector can be prepared, large-scale and continuous production can be realized, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of battery silicon-carbon electrode materials, in particular to a method for continuously preparing collector-free silicon-carbon negative electrode paper. Background technique [0002] Lithium-ion batteries have long cycle life, high power density, low self-discharge rate and are environmentally friendly, so they are often used as power batteries for new energy vehicles. Graphitized carbon material is the most commonly used negative electrode material for commercial lithium-ion batteries. It has good conductivity and stable cycle, but its theoretical specific capacity is small, which greatly limits the replacement of batteries. Silicon-based negative electrode materials have a high theoretical specific capacity, so silicon-carbon composite materials are currently used to prepare silicon-carbon negative electrodes. However, the currently prepared negative electrode not only has silicon-carbon...

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Problems solved by technology

[0003] The purpose of the present invention is to improve the shortcomings of large-scale continuous production difficulties in the prior art, and provide a method for continuously preparing collector-free silicon carbon negative electrode paper to improve the production efficiency of negative electrodes

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