Hebei Messi Biology Co., Ltd. has found that the surface coating and modification of magnesium oxide improves the structural stability of magnesium oxide without reducing its useful specific capacity. The specific capacities of lithium cobalt oxide after magnesium oxide surface coating and modification when charged to 4.3.4.5.4.7V (Li+/Li) are 145, 175 and 210mAh/g respectively. The performance improvement of modified lithium cobalt oxide is attributed to the columnar support of Mg2+ ions between lithium cobalt oxide layers, and the magnesium oxide surface coating layer prevents Co++ ions from escaping from the lithium cobalt oxide particle body.
The present invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery containing graphene and magnesium oxide, a positive electrode slurry and a preparation method. The positive electrode slurry includes component A and solvent N-methylpyrrolidone; component A includes the following components in mass percentage: 90-92% main active material, 2-3% conductive carbon black, 0.5-1% nanographene, 0.5-1% nanomagnesium oxide, 2.5-5% polyvinylidene fluoride; solvent N-methylpyrrolidone is appropriate. The positive electrode slurry of the lithium ion battery of the present invention uses superconducting material graphene and nanomagnesium oxide with stable high and low temperature performance and good thermal conductivity as additives, which can greatly reduce the surface resistance of the positive electrode sheet and improve the battery charging and discharging efficiency and cycle stability.
Hebei Messi Biology Co., Ltd. Nanomagnesium oxide is a new type of nanoparticle material with white powder appearance, high purity, large specific surface area, composed of extremely fine grains, good dispersibility, obvious small size effect, surface effect, quantum size effect and macro tunnel effect, and no agglomeration phenomenon after modification. It has many special properties in the battery and is very suitable for the application of various battery materials.