Negative electrode for lithium-ion secondary battery, and manufacturing method for same

锂离子二次电池用负极及其制造方法

Abstract

本发明的目的在于提供用于在含有硅类负极活性物质作为负极活性物质的情况下提高锂离子二次电池的循环特性的方法。为此,本发明的实施方式之一的锂离子二次电池用负极可以通过将负极活性物质、粘合剂材料及粘合性提高剂在溶剂中混合,制备负极活性物质浆料;以及将所述负极活性物质浆料涂布于集电体表面,在无氧条件下进行热处理而得到。负极活性物质包含硅作为主成分。粘合剂材料是选自聚酰亚胺、聚酰胺、聚酰胺酰亚胺、以及它们的预聚物中的至少1种。粘合性提高剂是选自多元羧酸及其衍生物、以及多元胺中的至少1种。
The purpose of the present invention is to provide a means for increasing the cycle characteristics of a lithium-ion secondary battery when silicon negative electrode active material is included as the negative electrode active material. [Solution] The negative electrode for a lithium-ion secondary battery, according to one embodiment of the present invention, is obtained by preparing a negative electrode active material slurry by mixing negative electrode active material, a binder material, and a binding properties improving agent in a solvent, applying the negative electrode active material slurry on the surface of a collector, and heat treating in anaerobic conditions. The negative electrode active material contains silicon as the main component thereof. The binder material is at least one kind selected from the group consisting of polyimide, polyamide and polyamideimide, and prepolymers of the same. The binding properties improving agent is at least one kind selected from the group consisting of polyvalent carboxylic acid and derivatives of the same, and polyvalent amine.

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Patent Citations (3)

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