Fundamental understanding of high-capacity lithium-excess cathodes with disordered rock salt structure

Hao Lin ¹Beatriz Moreno ²Kamil Kucuk ³Sensen Zhang ⁴Shankar Aryal ⁵Zheng Li ⁶Carlo U.Segre ⁵Jassiel Rodriguez ⁶Dhanya Puthusseri ⁶Lirong Cai ⁶Xuechen Jiao ⁷Vilas G.Pol⁶

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作者信息

1. Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, 47907, USA;Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA
2. Canadian Light Source Inc., Saskatoon, Saskatchewan S7N 5A8, Canada
3. Department of Physics & CSRRL Illinois Institute of Technology, Chicago, IL, 60616 USA
4. Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, 47907, USA;School of Metallurgy, Northeastern University, Shenyang 110819, China
5. Department of Physics & CSRRL Illinois Institute of Technology, Chicago, IL, 60616 USA;Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
6. Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, 47907, USA
7. Australian Synchrotron, ANSTO, Clayton, Victoria 3168, Australia
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Abstract

As a new class of lithium rich cathodes,disordered rock-salt cathodes have been of primary interest,because of their ability to deliver a promisingly high capacity up to 300 mA h/g.Nevertheless,some fundamental issues are yet to be fully understood and a comprehensive mastering of their solid-state chemistry,kinetics and thermal stability is required.Here,we select a high capacity cation-disordered positive electrode-Li1.2Ni0.4Nb0.4O2 as a model compound to study intrinsic reaction mechanism,including charge compensation mechanism,kinetics,thermal stability,and structural evolution.By combining soft and hard X-ray absorption spectroscopy (XAS),X-ray photoelectron spectroscopy (XPS) with operando and exsitu differential scanning calorimetry (DSC),galvanostatic intermittent titration technique (GITr),cyclic voltammetry (CV),and X-ray diffraction (XRD),we present holistic information on disordered rock-salt cathode.This work provides beneficial insights into designing and tailoring new positive electrodes with disordered rock-salt structure.

Key words

Salt-rock structure/Hard/soft XAS/In-situ DSC/Structural evolution

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出版年

2021

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量78

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