Positive electrode material for lithium battery

Abstract

The invention discloses a positive electrode material for a lithium battery, and the material comprises a positive electrode active substance, a binder, a conductive agent, a conductive enhancer, a dispersing agent and a slurry mixing solvent, wherein the mass percentages of all components are as follows: 60-80% of the positive electrode active substance; 5-10% of the binder, 6-12% of the conductive agent, 4-6% of the conductive enhancer, 0.25-1% of the dispersing agent, 1-3% of an auxiliary agent and 3-6% of the slurry mixing solvent. The slurry mixing solvent is a mixed solvent formed by mixing N, N-dimethylacetamide, dimethyl sulfoxide, tetramethylurea, trimethyl phosphate, dimethylformamide and water. The material achieves the purposes that the lithium battery is moderate in cost, thehigh-temperature performance is excellent, the capacity retention ratio is high, the cycle performance is good and the service life is long.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery cathode material. Background technique [0002] With the wide application and rapid development of lithium batteries, people have higher and higher performance requirements for lithium-ion batteries, which not only require lithium batteries to have a higher capacity, but also require better capacity retention during repeated charging and discharging. rate, exhibits good cycle performance, and has a long service life. The main constituent materials of lithium batteries include electrolyte, isolation materials, positive and negative electrode materials, etc. The positive electrode material occupies a large proportion (the mass ratio of positive and negative electrode materials is 3: 1 ~ 4: 1), because the performance of the positive electrode material directly affects the performance of the lithium-ion battery, and its cost also directly determines the ...