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题名: Study on enhancing electrochemical properties of Li in layered compound Na0.7Li0.3Mn0.75O2
作者: Yu, H;  Liu, GQ;  Li, GC;  Zhang, JY;  Chen, G;  Wen, L
发表日期: 2018-2-10
摘要: The enhancing sodium ion insertion and deinsertion characteristics of Li in layered structure compound were studied. Layered structure materials Na2/3Ni1/3Mn2/3O2 and Na0.7Li0.3Mn0.75O2 were synthesized. They can be used as cathode materials for sodium ion batteries. Although they displayed same crystal structures, the Na0.7Li0.3Mn0.75O2 exhibited better electrochemical properties than Na2/3Ni1/3Mn2/3O2. For Na0.7Li0.3Mn0.75O2, when cycled between 2.0 and 4.4 V at a current rate of 17 mA g(-1), its charge capacity of reached 175 mAh g(-1), and its discharge capacity was 149 mAh g(-1). In the first several charge-discharge cycles, the capacity decreased with cycles performing. Then capacity tended to be stable and began to increase. After 40 cycles, its discharge capacity was 143 mAh g(-1). It discharge capacity could reach 121 mAh g(-1) at current rates of 0.34 mA g(-1)-charge/0.85 mA g(-1)-discharge. Li element enhanced the electrochemical properties such as cycle performance and rate capability. (c) 2018 Elsevier Ltd. All rights reserved.
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Recommended Citation:
Yu, H,Liu, GQ,Li, GC,et al. Study On Enhancing Electrochemical Properties Of Li In Layered Compound Na0.7li0.3mn0.75o2[J]. Electrochimica Acta,2018,263:474-479.

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