期刊
JOURNAL OF POWER SOURCES
卷 343, 期 -, 页码 345-353出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.01.066
关键词
Lithium-ion batteries; Li2SiO3-coating; Ni-rich cathode; Cycle stability; High cut-off voltage
资金
- Beijing Nova Program [Z141103001814065]
- State Key Project of Fundamental Research [2014CB931900, 2012CB932504]
- Youth Innovation Promotion Association CAS [2016152]
A high cut-off voltage is pretty pivotal for the improvement of the energy density of cathode materials. Unfortunately, high-capacity Ni-rich cathode materials usually show serious capacity attenuation at high cut-off voltage. Herein, we propose a Li2SiO3-surface modification strategy to highly improve the cycle performance of the Ni-rich LiNi(0.8)Mn(0,1)Co(0.1)O(2)material at high voltage. The capacity retention of the pristine and U2SiO3-coated electrodes is 57.6 and 77.7%, respectively, at the cut-off voltage of 4.6 V after 50 cycles. Meanwhile, the problems of polarization and voltage reduction of LiNi0.8Mn0.1Co0.1O2 are also alleviated. Our results show that Li2SiO3-surface modification is a very effective strategy for improving the cycle stability of Ni-rich cathode materials and can be used for other high capacity electrode materials.(C) 2017 Elsevier B.V. All rights reserved.
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