![]() First, RLC would absorb the trace water in the air and increase the powder alkalinity, which will further gel the slurry during electrode fabrication process, corrode the current collector, and worsen the consistency of electrode and the corresponding batteries ( He et al., 2018 Junhyeok et al., 2018 Bichon et al., 2019). This undesired RLC has many adverse effects on the Ni-rich materials. On the other side, the surface active lattice lithium and oxygen species of Ni-rich cathode materials would react with the H 2O and CO 2 in the air during storage under the influence of reduction of sensitive Ni 3+, forming the undesirable RLC and surface NiO rock-salt layer ( Huang et al., 2019). The cathode materials have been considered as the focus and weak link of high-energy LIBs thus, the high-capacity layered Ni-rich LiNi xCo yMn 1-x-yO 2 (0.5 60%), the calcination temperature needs to be lower and thus more likely leading to the formation of RLC ( Junhyeok et al., 2018 Park J. However, it is still urgent to develop high-energy density LIBs to satisfy the ever-growing demands of electric vehicles ( He et al., 2018 Su et al., 2018a Kong et al., 2019 Liang et al., 2019). Nowadays, lithium-ion batteries (LIBs) have been considered as the most feasible equipment to utilize the electrical energy. The performance enhancements should be ascribed to the surface washing process, which removed not only the RLCs, but also the loose primary particles effectively. The 150th capacity retentions after storing had increased from 68.39% of pristine material to 85.46–94.84% of the washed materials. It has been determined by powder pH and Fourier transform infrared spectra results that the amount of RLCs was reduced effectively, and the storage performance was significantly enhanced for the washed samples. The optimal parameters including washing time, boric acid concentration, and solid–liquid ratio were systematically studied. It is a low-cost process because the filter liquor can be recycled. This work presents an effective surface washing method to remove the RLCs from LiNi 0.90Co 0.06Mn 0.04O 2 material surface, via ethyl alcohol solution that contains low concentration of boric acid. The existence of residual lithium compounds (RLCs) on the surface of layered Ni-rich materials will deteriorate the electrochemical properties and cause safety problem. 3School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, China.2Beijing Institute of Technology Chongqing Innovation Center, Chongqing, China. ![]() 1Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, China. ![]() Yuefeng Su 1,2 Gang Chen 1,2 Lai Chen 1,2 * Linwei Li 1 Cong Li 1 Rui Ding 1 Jiahui Liu 1 Zhao Lv 3 Yun Lu 1,2 Liying Bao 1 Guoqiang Tan 1,2 Shi Chen 1 Feng Wu 1,2
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