Commercial carbon molecular sieves as a high performance anode for sodium-ion batteries
Commercial carbon molecular sieves as a high performance anode for sodium-ion batteries
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DOI：
10.1016/j.ensm.2015.12.004
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发表时间：
2016-04-01
影响因子：
20.4
通讯作者：
Yang, Quan-Hong
中科院分区：
文献类型：
--
作者：
Zhang, Si-Wei;Lv, Wei;Yang, Quan-Hong
商用碳分子筛（CMS）表现出优异的Na离子存储性能，是目前市售材料中最好的，并且比报道的大多数具有复杂微观结构的硬碳要好得多。通过N2吸附测得的CMS具有非常低的比表面积，在100 mA/g的相对高电流密度下表现出297 mA h/g的高可逆容量，并且更有希望的是，高达73.2%的非常高的初始库仑效率，这是未改性商业碳中最高的。如此良好的性能主要归功于其丰富的超小（0.3-0.5 nm）孔隙，这些孔隙只允许Na离子插入，同时排斥电解质，从而防止其与碳表面接触，这是钠离子电池（SIB）高性能负极材料设计的基本原则。 CMS 还表现出高速率和循环性能。这样的性能基本上满足了商业化SIB负极材料的需求，这一发现有望像锂离子电池中的石墨一样促进SIB的商业化实际应用。 (C) 2016 Elsevier B.V. 保留所有权利。
A commercial carbon molecular sieve (CMS) demonstrates excellent Na ion storage performance and is the best among current commercially available materials and much better than most hard carbons reported with complex microstructures. With a very low specific surface area measured by N2 adsorption, the CMS shows a high reversible capacity of 297 mA h/g at a relatively high current density of 100 mA/g, and, more promising, a very high initial Coulombic efficiency of up to 73.2%, which is the highest among unmodified commercial carbons. Such good performance is mainly the result of its abundant ultra-small (0.3-0.5 nm) pores that only allow the insertion of Na ions while rejecting the electrolyte, thus preventing its contact with the carbon surface, which is a basic principle for the design of a high performance anode material for a sodium-ion battery (SIB). The CMS also exhibits high rate and cyclic performance. Such performance basically meets the demand for commercial anode materials for a SIB, and hopefully, this finding will promote the commercialization of SIBs for practical use as graphite does for lithium-ion batteries. (C) 2016 Elsevier B.V. All rights reserved.