期刊
ACS NANO
卷 12, 期 7, 页码 7018-7027出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b02721
关键词
sodium-ion battery; cross-linking strategy; porous carbon shell; CuP2 composites; full cell
类别
资金
- National Key R&D Program of China [2018YFB0905400, 2016YFB0100305]
- National Natural Science Foundation of China [51622210]
- Fundamental Research Funds for the Central Universities [WK3430000004]
- Sofia Kovalevskaja award
- Alexander von Humboldt Foundation
Sodium-ion batteries (SIB) are regarded as the most promising competitors to lithium-ion batteries in spite of expected electrochemical disadvantages. Here a cross-linking strategy is proposed to mitigate the typical SIB problems. We present a SIB full battery that exhibits a working potential of 3.3 V and an energy density of 180 Wh kg(-1) with good cycle life. The anode is composed of cross-linking hollow carbon sheet encapsulated CuP2 nanoparticles (CHCS-CuP2) and a cathode of carbon coated Na3V2(PO4)(2)F-3 (C-NVPF). For the preparation of the CHCS-CuP2 nanocomposites, we develop an in situ phosphorization approach, which is superior to mechanical mixing. Such CHCS-CuP2 nanocomposites deliver a high reversible capacity of 451 mAh g(-1) at 80 mA g(-1), showing an excellent capacity retention ratio of 91% in 200 cycles together with good rate capability and stable cycling performance. Post mortem analysis reveals that the linking hollow carbon sheet structure as well as the initially formed SEI layers are well preserved. Moreover, the inner electrochemical resistances do not significantly change. We believe that the presented battery system provides significant progress regarding practical application of SIB.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据