▎ 摘　　要

NOVELTY - Potassium ion battery anode material, i.e. potassium vanadium oxyfluoride phosphate (I) is new. USE - (I) is useful in potassium ion battery (claimed). ADVANTAGE - (I): uses oxygen element to replace fluorine element, and then the crystal structure and transmission characteristics are changed; has high energy and high power density, stable structure and long cycle life, and reduces the cost, which is beneficial to industrialized production. DETAILED DESCRIPTION - Potassium ion battery anode material, i.e. potassium vanadium oxyfluoride phosphate of formula (K3V2(PO4)2O2xF3-2x) (I) is new. x = 0.005-1, preferably 1. An INDEPENDENT CLAIM is also included for preparation of (I).