Facile Synthesis of Ultrasmall CoS2 Nanoparticles within Thin N-Doped Porous Carbon Shell for High Performance Lithium-Ion Batteries
Facile Synthesis of Ultrasmall CoS2 Nanoparticles within Thin N-Doped Porous Carbon Shell for High Performance Lithium-Ion Batteries
复制标题
在薄氮掺杂多孔碳壳内轻松合成超小 CoS2 纳米粒子，用于高性能锂离子电池
DOI：
10.1002/smll.201403579
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发表时间：
2015
期刊：
影响因子：
13.3
通讯作者：
Xu Qiang
中科院分区：
文献类型：
--
作者：
Wang Qingfei;Zou Ruqiang;Xia Wei;Ma Jin;Qiu Bin;Mahmood Asif;Zhao Ruo;Yang Yangyuchen;Xia Dingguo;Xu Qiang
硫化钴（CoS 2）被认为是高性能锂离子电池（LIB）最有前途的替代阳极材料之一，因为它具有出色的导电性、高理论容量和低成本。然而，由于在电池充电/放电过程中其体积膨胀和多硫化物中间体在有机电解质中的溶解，其具有差的循环稳定性和低倍率性能。本研究采用纳米金属有机骨架（MOF）模板制备了一种新型多孔碳/CoS 2复合材料，用于制备高性能LIB。在富氮碳中制备的超小CoS 2（15 nm）纳米颗粒表现出有前途的锂存储性能，在高充电/放电速率下容量损失可忽略不计。在100 mA g-1的电流密度下，50次循环后保持560 mA h g-1的容量。即使在高达2500 mA g−1的电流密度下，也可获得410 mA h g− 1的可逆容量。优异且高度稳定的电池性能应归功于超小CoS 2颗粒和源自纳米级MOF前体的薄的富氮多孔碳壳的协同作用。
Cobalt sulfide (CoS2) is considered one of the most promising alternative anode materials for high‐performance lithium‐ion batteries (LIBs) by virtue of its remarkable electrical conductivity, high theoretical capacity, and low cost. However, it suffers from a poor cycling stability and low rate capability because of its volume expansion and dissolution of the polysulfide intermediates in the organic electrolytes during the battery charge/discharge process. In this study, a novel porous carbon/CoS2composite is prepared by using nano metal–organic framework (MOF) templates for high‐preformance LIBs. The as‐made ultrasmall CoS2(15 nm) nanoparticles in N‐rich carbon exhibit promising lithium storage properties with negligible loss of capacity at high charge/discharge rate. At a current density of 100 mA g−1, a capacity of 560 mA h g−1is maintained after 50 cycles. Even at a current density as high as 2500 mA g−1, a reversible capacity of 410 mA h g−1is obtained. The excellent and highly stable battery performance should be attributed to the synergism of the ultrasmall CoS2particles and the thin N‐rich porous carbon shells derieved from nanosized MOF precusors.