A kind of modified styrene-butadiene rubber type negative electrode binder

Abstract

The invention discloses a modified styrene-butadiene rubber type anode adhesive. The adhesive is characterized by being modified styrene-butadiene rubber. A preparation method of the modified styrene-butadiene rubber comprises the following steps: S1, mixing and stirring styrene-butadiene rubber with acrylic acid, and performing irradiation to obtain an irradiation product; S2, mixing and stirringthe irradiation product with sodium hydroxide, and performing washing to obtain the modified styrene-butadiene rubber. The invention further discloses a silicon-based anode material prepared from themodified styrene-butadiene rubber type anode adhesive and a preparation method of the silicon-based anode material. The anode adhesive can improve the long cycle performance of the anode material andfirst coulombic efficiency of lithium ion batteries.

Description

Technical field [0001] The invention relates to a negative electrode binder, in particular to a modified styrene butadiene rubber type negative electrode binder. Background technique [0002] In recent years, in order to develop high-energy-density rechargeable lithium-ion batteries, a lot of work has been concentrated on silicon-based anode materials. The reason is that silicon has an ultra-high theoretical capacity (4200mAh / g). However, due to the accompanying The large volume effect causes the pulverization of the silicon particles, which in turn causes the loss of electrical contact between the silicon particles and the conductive agent, and destroys the entire electrode structure, resulting in capacity attenuation and poor cycle performance. [0003] The effective way to solve the problem is to find a suitable adhesive. Common adhesives include PAA, CMC / SBR, sodium alginate, chitosan, PI, PAI, etc. Among them, SBR type adhesives are due to It is widely used in low-capacity si...

AI Technical Summary

Problems solved by technology

[0002] In recent years, in order to develop rechargeable lithium-ion batteries with high energy density, a lot of work has focused on silicon-based anode materials because of the ultra-high theoretical capacity of silicon (4200mAh / g), but due to the accompanying The large volume effect leads to the pulverization of silicon particles, which leads to the loss of electrical contact between the silicon particles and the conductive agent, destroying the entire electrode structure, resulting in capacity attenuation and poor cycle performance