Collapse of LiNi1-x-yCoxMnyO2 Lattice at Deep Charge Irrespective of Nickel Content in Lithium-Ion Batteries

被引:383
作者
Li, Wangda [1 ,2 ]
Asl, Hooman Yaghoobnejad [1 ,2 ]
Xie, Qiang [1 ,2 ]
Manthiram, Arumugam [1 ]
机构
[1] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA
[2] Univ Texas Austin, Texas Mat Inst, Austin, TX 78712 USA
关键词
X-RAY-DIFFRACTION; CATHODE MATERIALS; NI-RICH; LINIO2; ELECTROCHEMISTRY; CRACKING;
D O I
10.1021/jacs.8b13798
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Volume variation and the associated mechanical fracture of electrode materials upon Li extraction/insertion are a main cause limiting lifetime performance of lithium-ion batteries. For LiNi1-x-yCoxMnyO2 (NCM) cathodes, abrupt anisotropic collapse of the layered lattice structure at deep charge is generally considered characteristic to high Ni content and can be effectively suppressed by elemental substitution. Herein, we demonstrate the lattice collapse is a universal phenomenon almost entirely dependent on Li utilization, and not Ni content, of NCM cathodes upon delithiation. With Li removal nearing 80 mol %, very similar c-axis lattice shrinkage of around 5% occurs concurrently for NCMs synthesized in-house regardless of nickel content (90, 70, 50, or 33 mol %); meanwhile, the a-axis lattice contracts for high-Ni NCM, but it expands for low-Ni NCM. We further reveal Co-Mn cosubstitution in NCM barely, if at all, affects several key structural aspects governing the lattice distortion upon delithiation. Our results highlight the importance of evaluating true implications of compositional tuning on high-Ni layered oxide cathode materials to maximize their charge-storage capacities for next-generation high-energy Li-ion batteries.
引用
收藏
页码:5097 / 5101
页数:5
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