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- Title
Enhanced cycling stability of single-crystal LiNi<sub>0.83</sub>Co<sub>0.07</sub>Mn<sub>0.10</sub>O<sub>2</sub> by Li-reactive coating with H<sub>3</sub>BO<sub>3</sub>.
- Authors
Hu, Wen-Hui; Yin, Ya; Sun, Ya; Liu, Guo-Xue; Yang, Shun-Yi; Huang, You-Yuan; Wang, Bo
- Abstract
Ni-rich cathode materials will be primarily used as next-generation high-specific energy cathode materials in lithium-ion batteries. However, residual Li formation and cracking considerably restrict the wide application of these materials. To address the issues related to cracking, micro-sized single-crystal cathode materials without internal grain boundaries are proposed. In this study, we constructed a thin LiBO2 layer on the single-crystal LiNi0.83Co0.07Mn0.10O2 particles by solvent-free H3BO3 modification. The residual Li on the material surface decreased by 14% through the reaction of LiOH/Li2CO3 and H3BO3. The coated materials exhibited higher initial Coulombic efficiency (88.44%), higher reversible capacity (213.4 mAh·g−1 at 0.1C), and better cycling performance (91.31% retention over 50 cycles within 3.0–4.3 V at 1.0C) than the unmodified materials. Using the galvanostatic intermittent titration technique, electrochemical impedance spectroscopy (EIS), and inductively coupled plasma-optical emission spectroscopy (ICP-OES), we reveal the mechanism by which the electrochemical properties are improved upon H3BO3 modification. The superior electrochemical performances are associated with increased Li+ conductivity, lower charge transfer impedance, and suppressed transition metal dissolution. Therefore, this study demonstrates the importance of surface modification in obtaining Ni-rich single-crystal materials with enhanced performance.
- Publication
Rare Metals, 2023, Vol 42, Issue 8, p2612
- ISSN
1001-0521
- Publication type
Article
- DOI
10.1007/s12598-022-02213-9