Enhancement in electrochemical properties of boron-doped LiNi0.815Co0.15Al0.035O2 cathode
Jiatai Wang, Yuanyuan Li, Shishi Wei, Shunli Hou, Geng Zhou, Xiaocen Yan, Ruheng Xi, Xiaoyi Hou
Abstract
The lattice of the cathode material LiNi 0.815 Co 0.15 Al 0.035 O 2 cathode (NCA) was doped with B 3+ using a high-temperature solid-phase method, considerably improving the electrochemical properties of the NCA. Results of X-ray diffraction analysis and Rietveld refinement show that B 3+ can enhance lattice ordering by minimising Li + /Ni 2+ mixing. The scaning electron microscopy observations indicated that the B 3+ doped changes the particle morphology . The specific discharge capacities of 1.5%B-NCA were 178.31 and 123.74 mAhg −1 at 0.2 and 5C, respectively. After 100 cycles, the specific discharge capacity was 176.29 mAhg −1 at 0.2C with a capacity retention of 98.87%. Boron doping significantly improves the structural stability of nickel-rich cathode materials by suppressing the detrimental H2→H3 phase transition, thus improving the electrochemical performance of nickel-rich ternary lithium-ion batteries.