首页|Configuring single-layer MXene nanosheet onto natural wood fiber via C-Ti-C covalent bonds for high-stability Li-S batteries

Configuring single-layer MXene nanosheet onto natural wood fiber via C-Ti-C covalent bonds for high-stability Li-S batteries

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Lithium-sulfur batteries(LSBs)are considered promising candidates for next-generation battery tech-nologies owing to their outstanding theoretical energy density and cost-effectiveness.However,the low conductivity and polysulfide shuttling effect of S cathodes severely hamper the practical perfor-mance of LSBs.Herein,in situ-generated single layer MXene nanosheet/hierarchical porous carbonized wood fiber(MX/PCWF)composites are prepared via a nonhazardous eutectic activation strategy coupled with pyrolysis-induced gas diffusion.The unique architecture,wherein single layer MXene nanosheets are constructed on carbonized wood fiber walls,ensures rapid polysulfide conversion and continuous electron transfer for redox reactions.The C-Ti-C bonds formed between MXene and PCWF can consider-ably expedite the conversion of polysulfides,effectively suppressing the shuttle effect.An impressive capacity of 1301.1 mA h g-1 at 0.5 C accompanied by remarkable stability is attained with the MX/PCWF host,as evidenced by the capacity maintenance of 722.6 mA h g-1 after 500 cycles.Notably,the MX/PCWF/S cathode can still deliver a high capacity of 886.8 mA h g-1 at a high S loading of 5.6 mg cm-2.The construction of two-dimensional MXenes on natural wood fiber walls offers a competitive edge over S-based cathode materials and demonstrates a novel strategy for developing high-performance batteries.

Lithium-sulfur batteriesS cathodesMXene nanosheetsWood fiberC-Ti-C bonds

Yangyang Chen、Yu Liao、Ying Wu、Lei Li、Zhen Zhang、Sha Luo、Yiqiang Wu、Yan Qing

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College of Materials Science and Technology,Central South University of Forestry and Technology,Changsha 410004,Hunan,China

National Natural Science Foundation of ChinaYoung Elite Scientists Sponsorship Program from the National Forestry and Grassland Administration of ChinaScience and Technology Innovation Program of Hunan ProvinceHunan Provincial Innovation Foundation for Postgraduate

3189077120191326142022RC3054CX20230758

2024

10.1016/j.jechem.2024.04.012

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.95(8)