Studies on intrinsic phase-dependent electrochemical properties of MnS nanocrystals as anodes for lithium-ion batteries

JOURNAL OF POWER SOURCES

卷:338

Article

Hao, Yong¹  Chen, Chunhui¹  Yang, Xinyi²  Xiao, Guanjun³  Zou, Bo³  Yang, Jianwen^1,4  Wang, Chunlei^1,5,6 

[1] Florida Int Univ, Dept Mech & Mat Engn, 10555 W Flagler St, Miami, FL 33174 USA

[2] Jilin Univ, Minist Educ, Lab Phys & Technol Adv Batteries, Changchun 130012, Peoples R China

[3] Jilin Univ, State key Lab Superhard Mat, Changchun 130012, Peoples R China

[4] Guilin Univ Technol, Coll Chem & Bioengn, Guilin 541004, Peoples R China

[5] Florida Int Univ, Adv Mat Engn Res Inst, 10555 W Flagler St, Miami, FL 33174 USA

[6] Florida Int Univ, Ctr Study Matter Extreme Condit, Univ Pk, Miami, FL 33199 USA

关键词: Manganese sulfide nanocrystals;    Lithium-ion batteries;    Anode;    Electrochemical performance;    Capacity increase;   

DOI  :  10.1016/j.jpowsour.2016.11.032

来源: Elsevier

【 摘 要 】

Manganese sulfide (MnS), a member of transition metal sulfides, has been considered as a promising anode material for reversible Li storage due to its high theoretical capacity and structural advantages. However, the intrinsic electrochemical performance of MnS with different phases in lithium-ion batteries is yet to be fully investigated. Herein, high purity rock-salt (RS), zinc-blende (ZB) and wurtzite (WZ) MnS nanocrystals with different morphologies were successfully synthesized via a facile solvothermal method. The RS-MnS, ZB-MnS and WZ-MnS electrodes showed the capacities of 232.5 mAh g(-1), 287.9 mAh g(-1) and 79.8 mAh g(-1) at the 600th cycle, respectively. ZB-MnS displayed the best performance in terms of specific capacity and cyclability in comparison to RS-MnS and WZ-MnS nanocrystals. Interestingly, all the three kinds of MnS electrodes exhibited an unusual phenomenon of capacity increase upon cycling along with reduced particle sizes and without change in crystallinity. The main contribution of capacity increase was ascribed to the decreased cell resistance and enhanced interfacial charge storage, which facilitated more effective Li+ diffusion into electrode materials. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free