Porous 3D nitrogen-doped rGO/Co-Ni-S composite modified separator for high-capacity and stable lithium-sulfur batteries

被引:13
作者
Wu, Ping [1 ]
Tan, Long [2 ]
Wang, Xiao-Di [1 ]
Liao, Peng [3 ]
Liu, Zhi [1 ]
Hou, Pei-Pei [1 ]
Zhou, Qun-Yi [1 ]
Jin, Xin-Jian [1 ]
Li, Meng-Chao [1 ]
Shao, Xiang-Rong [4 ]
Zeng, Zheling [1 ]
Deng, Shuguang [6 ]
Dai, Gui-Ping [1 ,4 ,5 ]
机构
[1] Nanchang Univ, Sch Environm & Chem Engn, Dept Chem Engn, Nanchang 330031, Jiangxi, Peoples R China
[2] Nanchang Univ, Sch Mat Sci & Engn, Nanchang 330031, Jiangxi, Peoples R China
[3] Farasis Energy Inc, Dept Cell Res & Dev, Hayward, CA 94545 USA
[4] Tsinghua Univ, Yangtze Delta Reg Inst, Hangzhou Branch, Hangzhou 310019, Peoples R China
[5] Kingpoint Technol Inc, Hangzhou 310019, Peoples R China
[6] Arizona State Univ, Sch Engn Matter Transport & Energy, Tempe, AZ 85287 USA
基金
中国国家自然科学基金;
关键词
Lithium-sulfur battery; Functional separator; Shuttle effect; Composite; N-doped RGO; Transition metal sulfides; HIGH-PERFORMANCE LITHIUM; HIGH-ENERGY-DENSITY; CARBON; POLYSULFIDES; INTERLAYER; HOST; CATHODE; FACILE; FILM;
D O I
10.1016/j.materresbull.2021.111550
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A porous composite material consisted of nitrogen-doped 3D reduced graphene oxide and evenly distributed cobalt-nickel-sulfur (CNS) nanoparticles was coated on the surface of separator serving as the interlayer between separator and electrode in lithium-sulfur battery. It delivered an initial discharge capacity of 1524 mAh g(-1) at 0.1 C and a discharge capacity of 610 mAh g(-1) at 8 C. The designed Li-S battery exhibited superior long-term stability. After 350 cycles tested at 1 C, it retained a capacity as high as 700 mAh g(-1). It revealed that the N-dopants and decorated CNS nanoparticles in the composite could provide active sites to adsorb soluble poly-sulfides and accelerate the conversion of polysulfides in redox reactions, respectively, thereby suppressing the shutter effect and improving the electrochemical performance of the Li-S battery. Our strategy is promising for preparing safe and long-cycle Li-S batteries.
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页数:7
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