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

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

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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 lay-ered cathodes often declines because of capacity fading during cycling.This decline is primarily attribu-ted 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 devel-opment 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.

Lithium-ion batteryLayered lithium-rich cathodeSurface double-coupling engineeringLattice strainOxygen release

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

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School of Materials Science and Engineering,Beijing Key Laboratory of Environmental Science and Engineering,Beijing Institute of Technology,Beijing 100081,China

Chongqing Innovation Center,Beijing Institute of Technology,Chongqing 401120,China

Yibin Libode New Materials Co.,Ltd,Yibin 64400,Sichuan,China

Initial Energy Science & Technology(Xiamen)Co.,Ltd,Xiamen 361000,Fujian,China

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2024

10.1016/j.jechem.2024.06.047

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.98(11)