材料科学
锂(药物)
阴极
表面改性
降级(电信)
氧化物
纳米技术
电化学
化学工程
电极
冶金
电子工程
电气工程
化学
物理化学
内分泌学
工程类
医学
作者
Huiping Yang,Hong‐Hui Wu,Mingyuan Ge,Lingjun Li,Yifei Yuan,Qi Yao,Jie Chen,Lingfeng Xia,Jiangming Zheng,Zhaoyong Chen,Junfei Duan,Kim Kisslinger,Xiao Cheng Zeng,Wah‐Keat Lee,Qiaobao Zhang,Jun Lü
标识
DOI:10.1002/adfm.201808825
摘要
Abstract A critical challenge in the commercialization of layer‐structured Ni‐rich materials is the fast capacity drop and voltage fading due to the interfacial instability and bulk structural degradation of the cathodes during battery operation. Herein, with the guidance of theoretical calculations of migration energy difference between La and Ti from the surface to the inside of LiNi 0.8 Co 0.1 Mn 0.1 O 2 , for the first time, Ti‐doped and La 4 NiLiO 8 ‐coated LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathodes are rationally designed and prepared, via a simple and convenient dual‐modification strategy of synchronous synthesis and in situ modification. Impressively, the dual modified materials show remarkably improved electrochemical performance and largely suppressed voltage fading, even under exertive operational conditions at elevated temperature and under extended cutoff voltage. Further studies reveal that the nanoscale structural degradation on material surfaces and the appearance of intergranular cracks associated with the inconsistent evolution of structural degradation at the particle level can be effectively suppressed by the synergetic effect of the conductive La 4 NiLiO 8 coating layer and the strong TiO bond. The present work demonstrates that our strategy can simultaneously address the two issues with respect to interfacial instability and bulk structural degradation, and it represents a significant progress in the development of advanced cathode materials for high‐performance lithium‐ion batteries.
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