Anode slurry binding agent used for lithium ion batteries

Abstract

The invention belongs to the technical field of lithium ion battery manufacturing, and discloses an anode slurry binding agent used for lithium ion batteries. The anode slurry binding agent is prepared from raw materials including polyvinyl alcohol, polyacrylic acid, sodium carboxymethylcellulose, sodium alginate, and a binding agent additive; the binding agent additive is prepared from polyvinylidene fluoride, Ketjen black, and polymethyl acrylate. The anode slurry binding agent possesses excellent binding performance, is capable of realizing better and more uniform binding of anode active materials, is suitable for batteries with requirements on higher cycling performance, and is capable of improving safety performance of anode slurry, realizing automatic stop of exothermic reaction of assembled lithium ion batteries at high temperature, and ensuring the safety of lithium ion batteries in applications.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion batteries, in particular to a negative electrode slurry binder for lithium ion batteries. Background technique [0002] In recent years, the rapid development of portable electronic products, electric vehicles, energy storage power stations and other fields has put forward higher requirements for energy storage technology. Lithium-ion batteries are the first choice in these fields due to their high energy density, and their energy density is getting higher. As the energy density of lithium-ion batteries is getting higher and higher, the safety problems it faces are becoming more and more severe, which has severely limited the terminal use of high-energy-density lithium-ion batteries. [0003] The safety problem of lithium-ion batteries is mainly due to the thermal runaway of batteries. Due to the abnormal heat generation reaction inside the battery, the internal temperature of ...

AI Technical Summary

Problems solved by technology

However, since the ceramic-coated diaphragm can only improve the thermal stability of the diaphragm, it cannot block the side reaction of heat generation, so its improvement effect is limited.

At present, it can only solve the safety problem of batteries with an energy density of no more than 200wh / kg; method 2 can partially contain the thermal runaway reaction of the battery, but because the electrodes of lithium-ion batteries are usually porous electrodes, the electrolyte is filled in the abundant electrode gaps; although The conduction of lithium ions between the positive and negative electrodes is blocked, but the reaction between the active material inside the electrode and the electrolyte is still going on, which will further lead to heat accumulation and trigger a thermal runaway reaction. Method 2 cannot be applied to high-energy and high-power lithium Ion battery system