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赵建庆副教授等合作在Advanced Energy Materials (IF 15.23)发表论文

日期: 2016-12-09     阅读次数:201

赵建庆副教授与美国布鲁克海文国家实验室Feng Wang课题组等合作在Advanced Energy Materials (IF 15.23)上发表研究论文



标题:In Situ Probing and Synthetic Control of Cationic Ordering in Ni-rich Layered Oxide Cathodes

 

作者:Jianqing Zhao, Wei Zhang, Ashfia Huq, Scott T. Misture, Boliang Zhang, Shengmin Guo, Lijun Wu, Yimei Zhu, Zonghai Chen, Khalil Amine, Feng Pan, Jianming Bai,* and Feng Wang*

 

论文摘要:

Ni-rich layered oxides (LiNi1-xMxO2; M=Co, Mn, …) are appealing alternatives to conventional LiCoO2 as cathodes in Li-ion batteries for automobile and other large-scale applications due to their high theoretical capacity and low cost. However, preparing stoichiometric LiNi1-xMxO2 with ordered layer structure and high reversible capacity, has proven difficult due to Ni2+/Li+ cation mixing in octahedral sites. Herein, we report on in-situ studies of synthesis reactions and the associated structural ordering in preparing LiNiO2 and the Co-substituted variant, LiNi0.8Co0.2O2, thereby gaining insights into synthetic control of the structure and electrochemical properties of Ni-rich layered oxides. Results from this study indicate a direct transformation of the intermediate from the rock salt structure into hexagonal phase, and during the process, Co substitution facilities the nucleation of a Co-rich layered phase at low temperatures and subsequent growth and stabilization of solid solution Li(Ni, Co)O2 upon heat treatment in a highly oxidation environment. Optimal conditions were identified from the in-situ studies and utilized in obtaining stoichiometric LiNi0.8Co0.2O2 that exhibits high capacity (around 200 mAh/g) with excellent retention. The findings shed light on designing Ni-rich layered oxide cathodes with enhanced electrochemical properties through synthetic control of the structural ordering in the materials.

 

原文链接:http://onlinelibrary.wiley.com/doi/10.1002/aenm.201601266/full

期刊名称:Advanced Energy Materials

///页:Volume 201601266




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