Nature of extra capacity in MoS2 electrodes: Molybdenum atoms accommodate with lithium

被引:243
作者
Wang, Longlu [1 ]
Zhang, Qingfeng [1 ]
Zhu, Jingyi [2 ,3 ]
Duan, Xidong [4 ]
Xu, Zhi [5 ]
Liu, Yutang [6 ]
Yang, Hongguan [1 ]
Lu, Bingan [1 ,4 ,5 ]
机构
[1] Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China
[2] Clemson Univ, Dept Phys & Astron, Clemson Nanomat Ctr, Clemson, SC 29634 USA
[3] Clemson Univ, COMSET, Clemson, SC 29634 USA
[4] Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China
[5] Fujian Strait Res Inst Ind Graphene Technol, Sanchuang Pk,Century Ave, Jinjiang 362200, Fujian, Peoples R China
[6] Hunan Univ, Coll Environm Sci & Engn, Lushan South Rd, Changsha 410082, Hunan, Peoples R China
基金
中国国家自然科学基金;
关键词
Molybdenum disulfide; The extra capacity; Mo atoms accommodate with lithium; Li-ion batteries; FEW-LAYER MOS2; ANODE MATERIAL; GRAPHENE SHEETS; POROUS CARBON; PERFORMANCE; NANOSHEETS; STORAGE; TRANSITION; NANOCOMPOSITES; CONVERSION;
D O I
10.1016/j.ensm.2018.04.025
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Two-dimensional (2D) layered transition metal sulfide based materials are promising candidates for electrodes of lithium ion batteries (LIBs). As one of the representatives, molybdenum disulfide (MoS2), exhibits additional reversible capacity beyond their theoretical value although the lithium storage mechanism is still poorly understood. In this report, we developed a highly conducting metallic phase 1T(octahedral)-MoS2 based electrode with metal Mo atoms confined in "graphene nanoreactor" of abnormal lithium-storage sites, which delivered a high specific capacity of similar to 1800 mAh g(-1) at 1 A g(-1), about 2.6 times of its intercalation reactions value. Contrary to previous reports, a new lithium-storage mechanism for the high and ever-increasing capacity was proposed. The theoretical calculations and experiments show that a major contribution to the extra capacity in MoS2 anodes is due to Mo atoms accommodate with Li+. The Mo precipitates and their full contact with Li2S matrix enabled the reversible Mo -> LixMo -> Mo -> 1T-MoS2 reaction during charging/discharging processes. Over prolonged cycling, per Mo atomic could accommodate six Li+ ions. This new proposal could help to establish an accurate electrochemical reaction mechanism of MoS2 LIBs, which may lead to inspiration on new methods to greatly improve the performance of the MoS2 anode.
引用
收藏
页码:37 / 45
页数:9
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