Carbon-based lithium-ion battery negative electrode slurry and preparation method thereof, carbon-based lithium-ion battery negative electrode, lithium-ion battery and equipment

Abstract

The invention provides a carbon-based lithium ion battery negative electrode slurry and a preparation method thereof, a carbon-based lithium ion battery negative electrode, a lithium ion battery and equipment. The carbon-based lithium ion battery negative electrode slurry includes basic materials; the basic materials include carbon-based active material 85%-98%, sodium carboxymethyl cellulose 0.5%-5%, conductive agent 0.5%-5%, modifier 0.5% ‑8% and styrene butadiene polymer 0.5%‑5%; modifiers include graphite oxide and / or graphene oxide. Preparation method of carbon-based lithium ion battery negative electrode slurry: mixing raw materials to obtain the carbon-based lithium ion battery negative electrode slurry. The carbon-based lithium-ion battery negative electrode is prepared by using the carbon-based lithium-ion battery negative electrode slurry. Lithium-ion battery, including carbon-based lithium-ion battery negative electrode. devices that use lithium-ion batteries to power themselves or external devices. The carbon-based lithium ion battery negative electrode slurry provided in the present application has good adhesion and can effectively improve the battery capacity retention rate.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a carbon-based lithium-ion battery negative electrode slurry and a preparation method thereof, a carbon-based lithium-ion battery negative electrode, a lithium-ion battery and equipment. Background technique [0002] At present, most of the binders used in the negative electrode materials of lithium batteries on the market are SBR, which has a small interface force with graphite, conductive agent, and sodium carboxymethyl cellulose (CMC), resulting in poor bonding effect and affecting the battery cell. electrical properties and cycle performance. At present, the conventional method to solve the poor adhesion of SBR is to increase the amount of SBR, increase the molecular weight of SBR, and develop other types of binders. Although increasing the amount of SBR can improve the adhesion of the negative electrode, it will inevitably reduce the active material and electrical conduc...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the binders used in the negative electrode materials of lithium batteries on the market are SBR, which has a small interface force with graphite, conductive agent, and sodium carboxymethyl cellulose (CMC), resulting in poor bonding effect and affecting the battery cell. electrical properties and cycle performance

At present, the conventional method to solve the poor adhesion of SBR is to increase the amount of SBR, increase the molecular weight of SBR, and develop other types of binders. Although increasing the amount of SBR can improve the adhesion of the negative electrode, it will inevitably reduce the active material and electrical conductivity. However, increasing the molecular weight of SBR and developing other types of binders requires a lot of research and development investment, which is difficult to practice and is not suitable for solving current production problems.

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