Inhibit the Strain Accumulation for 5v Spinel Cathode by Mitigating the Phase Separation During High Voltage Stage

• DOI: 10.2139/ssrn.4604080
• Publication Date: 2023-10-16T22:17:37Z
• Authors: Saiyue Liu; Xiang Liu; Dongsheng Ren; Liang Yi; Wei Liu; Juping Xu; Tiening Tan; Jiahao Zhang; Yukun Hou; Yi Guo; Gaolong Zhu; Shuo Yin; Guohe Yuan; Yi Weng; Guohua Ma; Zuling Peng; Xiang Zheng; Wen Yin; Languang Lu; Minggao Ouyang
• Keywords: Strain (injury); Separation (statistics)

LiNi0.5Mn1.5O4 (LNMO) spinel cathode is a potential material for high-power, low-cost lithium-ion batteries (LIBs) due to its low raw cost, high operating voltage and efficient transport channel. However, LNMO suffers from structural stability the two-phase-transformation during charge/discharge process, leading poor cycling performance. To address issues, we have constructed homogeneous aggregated with multifaceted primary particle, namely single-crystal secondary particles (SSP LNMO). Ex situ in characterizations including synchrotron X-ray diffraction, neutron diffraction full pouch cell validated that SSP exhibit single solid-solution reactions restrained lattice evolution delithiation/ lithiation process. This contrast normal cathode, which demonstrates significant two-phase transition Li1-xNi0.5Mn1.5O4 rock-salt MnO2 at voltage. Therefore, has greatly improved cycle life compared cathode. Overall, this study possibility of constructing based on primary-grain morphology modulation improve intrinsic LIBs.