Patent ID: 9748600
Date: 2017-08-29
CPC Classifications: H01M,Y02E

Claim:
1. A phosphate-based battery anode composite material, wherein the composite material comprises (1) crystal grains of lithium vanadium phosphate salt and sodium vanadium phosphate salt, and (2) a carbon layer coated outside of the crystal grains, wherein the crystal grains have both a monoclinic lattice structure and an orthorhombic lattice structure; and in the composite material, a molar content of the crystal grains having an orthorhombic lattice structure (P and a formula of the composite material is A and in the anode composite material, a molar ratio of Li and Na is between 3.0 and 1.5 to between greater than 0 and 1.5; and the composite material has one to four voltage plateaus; a platform voltage is selected from the group consisting of about 3.6V, about 3.7V, about 3.8V, and about 4.1V; and a particle diameter of the composite material is between 100-2000 nm.