Fundamental understanding of high-capacity lithium-excess cathodes with disordered rock salt structure
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第15期
论文作者：Hao Lin Kamil Kucuk Sensen Zhang Shankar Aryal Zheng Li Carlo U.Segre Jassiel Rodriguez Dhanya Puthusseri Lirong Cai Xuechen Jiao Vilas G.Pol
摘 要：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 mAh/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（GITT）, 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.
Hao Lin1,2，Kamil Kucuk4，Sensen Zhang1,5，Shankar Aryal4,6，Zheng Li1，Carlo U.Segre4,6，Jassiel Rodriguez1，Dhanya Puthusseri1，Lirong Cai1，Xuechen Jiao7，Vilas G.Pol1
1. Davidson School of Chemical Engineering, Purdue University2. Department of Materials Science and Engineering, Iowa State University4. Department of Physics & CSRRI, Illinois Institute of Technology5. School of Metallurgy, Northeastern University6. Advanced Photon Source, Argonne National Laboratory7. Australian Synchrotron,ANSTO
摘 要：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 mAh/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（GITT）, 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.
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