Nano LiFePO4 coated Ni rich composite as cathode for lithium ion batteries with high thermal ability and excellent cycling performance

Ni-rich LiNi0.82Co0.12Mn0.06O2 (denoted as NCM) is successfully coated by LFP nanoparticles (denoted as NCM@LFP) through physical mechanical fusion in industrial level. The 18650 full cells are assembled with NCM@LFP as cathode, which exhibits quite excellent cycling performance and thermal stability. After 500 cycles, NCM@LFP parallel to Graphite full cell still delivers a discharge capacity of 165.3 mA h g(-1) (capacity retention with 91.65%) at 1 C in voltage range from 3.0 to 4.2 V at room temperature. Besides, according to Accelerating rate calorimeter (ARC) test, the onset thermal runaway temperature Tc and self-heating interval time.t of NCM@LFP parallel to Graphite are much higher than that of NCM parallel to Graphite, respectively, indicating an improved security performance of LFP-coated NCM@LFP parallel to Graphite cell.