Highly stable and ultrafast electrode reaction of graphite for sodium ion batteries
Highly stable and ultrafast electrode reaction of graphite for sodium ion batteries
复制标题
钠离子电池用石墨的高稳定性和超快电极反应
DOI:
10.1016/j.jpowsour.2015.05.116
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发表时间:
2015-10
期刊:
影响因子:
--
通讯作者:
Jun Chen
中科院分区:
文献类型:
--
作者:
Zhiqiang Zhu;Fangyi Cheng;Zhe Hu;Zhiqiang Niu;Jun Chen
Sodium ion battery is a potential sustainable energy storage system due to its abundance and low cost. To date, some Na-storage anode materials have achieved long life span, but the rate performance still remains insufficient. Herein, we show that in some linear ether-based electrolytes, graphite can not only render unprecedented cyclability (∼6000 cycles), but also exhibit ultrahigh rate capability (up to 10 A g−1), along with a reversible capacity of ∼110 mAh g−1. By combining electrochemical measurements and structural analysis (e.g.in situRaman andex situXRD measurements), we reveal that graphite undergoes a stage-evolution mechanism induced by the insertion of solvated sodium ions. Furthermore, kinetic studies have shown that this process accompanies with an intercalation pseudocapacitive behavior, which should be responsible for the obtained superior electrode properties.
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