期刊
RSC ADVANCES
卷 9, 期 63, 页码 36849-36857出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ra07873h
关键词
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资金
- National Natural Science Foundation of China [21878195, 21805198, 21805018]
- Distinguished Young Scholars of Sichuan University [2017SCU04A08]
- Huohua Ku project of Sichuan University [2018SCUH0094]
- Research Foundation for the Postdoctoral Program of Sichuan University [2017SCU12018, 2018SCU12045]
- Research Foundation for the Sichuan University and Zigong City Joint research project [2018CDZG-16]
Ni-rich layered transition metal oxides show great energy density but suffer poor thermal stability and inferior cycling performance, which limit their practical application. In this work, a minor content of Co and B were co-doped into the crystal of a Ni-rich cathode (LiNi0.8Co0.1Mn0.1O2) using cobalt acetate and boric acid as dopants. The results analyzed by XRD, TEM, XPS and SEM reveal that the modified sample shows a reduced energy barrier for Li+ insertion/extraction and alleviated Li+/Ni2+ cation mixing. With the doping of B and Co, corresponding enhanced cycle stability was achieved with a high capacity retention of 86.1% at 1.0C after 300 cycles in the range of 2.7 and 4.3 V at 25 degrees C, which obviously outperformed the pristine cathode (52.9%). When cycled after 300 cycles at 5C, the material exhibits significantly enhanced cycle stability with a capacity retention of 81.9%. This strategy for the enhancement of the electrochemical performance may provide some guiding significance for the practical application of high nickel content cathodes.
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