B₂O₃/LiBO₂ dual-modification layer stabilized Ni-rich cathode for lithium-ion battery
Date
2022
Authors
Lv, Y.
Huang, S.
Lu, S.
Ding, W.
Yu, X.
Liang, G.
Zou, J.
Kang, F.
Zhang, J.
Cao, Y.
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Journal article
Citation
Journal of Power Sources, 2022; 536:231510-1-231510-9
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Yao Lv, Shifei Huang, Sirong Lu, Wenbo Ding, Xiaoliang Yu, Gemeng Liang, Jinshuo Zou, Feiyu Kang, Jiujun Zhang, Yidan Cao
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Abstract
Ni-rich layered oxide material with high theoretical capacity and low cost is one of the most promising cathode candidates for high-energy-density lithium-ion battery. However, increase of Ni content triggers structural instability and fast capacity degradation, which severely impedes the practical application of Ni-rich materials. Here, a surface dual-modification layer of B₂O₃ & LiBO₂ is introduced to Ni-rich material LiNi₀.₈₉Co₀.₀₈Mn₀.₀₃O₂ (NCM89), which successfully stabilizes the layered structure of NCM89 during cycling as well as removes residual lithium in NCM89. The in-situ X-ray diffraction and cross-sectional scanning electron microscopy results demonstrate effectively improved structural reversibility and stability of the cathode. Moreover, the dissolution of transition metals and decomposition of electrolyte at the cathode/electrolyte interface are successfully suppressed, resulting in beneficial cathode electrolyte interphase (CEI) layer. As a result, the boron modified cathode exhibits s a high capacity of 180.4mAh g‾¹ along with an excellent capacity retention of 90% after 100 cycles at 1C in 2.75–4.35 V at 25 °C, while the pristine NCM89 cathode only retains 59% of its initial capacity after 100 cycles. Furthermore, the capacity retention of full cell after 350 cycles is improved from 52.5% to 90%.
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