首页|Regulation of the pore structure of carbon nanosheets based electrocatalyst for efficient polysulfides phase conversions

Regulation of the pore structure of carbon nanosheets based electrocatalyst for efficient polysulfides phase conversions

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The practical applications of lithium-sulfur(Li-S)batteries are hampered by the sluggish redox kinetics and polysulfides shuttle in the cyclic process,which leads to a series of problems including the loss of active materials and poor cycling efficiency.In this paper,the pore structures of carbon nanosheets based electrocatalysts were precisely controlled by regulating the content of water-soluble KCl template.The relationship between pore structures and Li-S electrochemical behavior was studied,which demonstrates a key influence of pore structure in polysulfides phase conversions.In the liquid-sloid redox reaction of polysulfides,the micropores and small mesopores(d＜20 nm)exhibited little impact,while the meso-pores(d＞20 nm)and macropores played a decisive role.As a typical exhibition,the nickel-embedded carbon nanosheets(Ni-CNS)with a high content of large mesopores and macropores can aid Li-S batteries in exhibiting stable cycling performance(760.1 mAh g-1 at 1 C after 300 cycles)and superior rate capac-ity(847.8 mAh g-1 at 2 C).Furthermore,even with high sulfur loading(8 mg cm-2)and low electrolyte(E/S is around 6 μL mg-1),the high area capacity of 7.7 mAh cm-2 at 0.05 C could be achieved.This work can provide a guideline for the design of the pore structure of carbon-based electrocatalysts toward high-efficiency sulfur species redox reactions,and afford a general,controllable,and simple approach to constructing high performance Li-S batteries.

Hierarchical porous carbon networkElectrocatalystMolten salt templating methodModified separatorsLi-S batteries

Xiaoyang Liu、Jingbo Zhang、Kangli Liu、Shijie Zhang、Rouhan Hou、Xiaoyi Hu、Peng Zhang、Guosheng Shao

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State Center for International Cooperation on Designer Low-Carbon & Environmental Materials(CDLCEM),School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China

Zhengzhou Materials Genome Institute(ZMGI),Xingyang 450100,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of Henan ProvinceNational Natural Science Foundation of Henan ProvinceFoundation for University Key Teacher of Henan ProvinceScience &Technology Innovation Talents in Universities of Henan ProvinceChina Postdoctoral Science Foundation

U2004172519722872023004103682223014200392020GGJS00923HASTIT0012021M692898

2024

10.1016/j.jmst.2023.07.004

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.171(4)
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