Enhanced structural stability and durability in lithium-rich manganese-based oxide via surface double-coupling engineering

Jiayu Zhao, Yuefeng Su*, Jinyang Dong, Xi Wang, Yun Lu, Ning Li, Qing Huang, Jianan Hao, Yujia Wu, Bin Zhang, Qiongqiong Qi, Feng Wu, Lai Chen

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

摘要

Lithium-rich manganese-based oxides (LRMOs) exhibit high theoretical energy densities, making them a prominent class of cathode materials for lithium-ion batteries. However, the performance of these layered cathodes often declines because of capacity fading during cycling. This decline is primarily attributed to anisotropic lattice strain and oxygen release from cathode surfaces. Given notable structural transformations, complex redox reactions, and detrimental interface side reactions in LRMOs, the development of a single modification approach that addresses bulk and surface issues is challenging. Therefore, this study introduces a surface double-coupling engineering strategy that mitigates bulk strain and reduces surface side reactions. The internal spinel-like phase coating layer, featuring three-dimensional (3D) lithium-ion diffusion channels, effectively blocks oxygen release from the cathode surface and mitigates lattice strain. In addition, the external Li3PO4 coating layer, noted for its superior corrosion resistance, enhances the interfacial lithium transport and inhibits the dissolution of surface transition metals. Notably, the spinel phase, as excellent interlayer, securely anchors Li3PO4 to the bulk lattice and suppresses oxygen release from lattices. Consequently, these modifications considerably boost structural stability and durability, achieving an impressive capacity retention of 83.4% and a minimal voltage decay of 1.49 mV per cycle after 150 cycles at 1 C. These findings provide crucial mechanistic insights into the role of surface modifications and guide the development of high-capacity cathodes with enhanced cyclability.

源语言英语
页(从-至)274-283
页数10
期刊Journal of Energy Chemistry
98
DOI
出版状态已出版 - 11月 2024

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