An active core-shell nanoscale design for high voltage cathode of lithium storage devices

JOURNAL OF POWER SOURCES

卷:360

Article

Lu, Zhongpei¹  Liu, Yang¹  Lu, Xiaojun¹  Wang, Hao¹  Yang, Gang^1,3  Chao, Yimin²  Li, Weili³  Yin, Fan¹ 

[1] Changshu Inst Technol, Sch Chem & Mat Engn, Jiangsu Lab Adv Funct Mat, Changshu 215500, Jiangsu, Peoples R China

[2] Univ East Anglia, Sch Chem, Energy Mat Lab, Norwich NR4 7TJ, Norfolk, England

[3] Jiangsu Univ Sci & Technol, Sch Mat Sci & Engn, Zhenjiang 212003, Peoples R China

关键词: Li ion batteries;    High volatge cathode material;    Core-shell structure;    LiNi0.5Mn1.5O4;   

DOI  :  10.1016/j.jpowsour.2017.06.036

来源: Elsevier

【 摘 要 】

Spinel LiN0.5Mn1.5O4 (LNM) is a potential high-voltage cathode for commercial lithium-ion batteries (LIBs). Maintaining an appropriate amount of Mn3+ in LNM is necessary to improve the rate performance. However, Mn3+ dissolution in the interface of LNM and electrolyte leads to the fast capacity degradation. Therefore, designing a cathode to prevent Mn3+ loss during charge/discharge is important for high performance LIBs. Here we present an active core-shell design with coating another high-voltage cathode material LiCoPO4 (LCP) on the surface of LNM nanoparticles. The LCP layer can simultaneously induce Mn3+ ions at the interface between LCP and LNM, and act as a stable shell to prevent the loss of Mn3+. The optimized sample LNM@5%LCP possesses 128 mAh g(-1) at 0.5 C and 115 mAh g(-1) at 20 C rate, and maintains 96% of the initial capacity operated at 55 degrees C over 100 cycles. (C) 2017 Elsevier B.V. All rights reserved.

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