Abstract: A coated cathode active material particle comprises a cathode active material particle and a coating layer derived from one or more phosphorus-containing compounds that surrounds the cathode active material particle. By coating of the cathode active material with the phosphorus-containing compound, degradation of the cathode active material due to reaction with water can be suppressed. As a result, the coated cathode active material can be successfully used in a water-based electrode slurry. A water-based electrode slurry comprising the coated cathode active material is also disclosed, and batteries comprising electrodes made using the water-based electrode slurry were found to have improved electrochemical performance.

Abstract: A coated cathode active material, wherein a coated cathode active material particle comprises a cathode active material particle and a coating layer derived from one or more phosphorus-containing compounds that surrounds the cathode active material particle. By coating of the cathode active material with the phosphorus-containing compound, degradation of the cathode active material due to reaction with water can be suppressed. As a result, the coated cathode active material can be successfully used in a water-based electrode slurry. A water-based electrode slurry comprising the coated cathode active material is also disclosed, and batteries comprising electrodes made using the water-based electrode slurry were found to have improved electrochemical performance.