首页|Hard-carbon hybrid Li-ion/metal anode enabled by preferred mesoporous uniform lithium growth mechanism

Hard-carbon hybrid Li-ion/metal anode enabled by preferred mesoporous uniform lithium growth mechanism

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To achieve high energy density in lithium batteries,the construction of lithium-ion/metal hybrid anodes is a promising strategy.In particular,because of the anisotropy of graphite,hybrid anode formed by gra-phite/Li metal has low transport kinetics and is easy to causes the growth of lithium dendrites and accu-mulation of dead Li,which seriously affects the cycle life of batteries and even causes safety problems.Here,by comparing graphite with two types of hard carbon,it was found that hybrid anode formed by hard carbon and lithium metal,possessing more disordered mesoporous structure and lithophilic groups,presents better performance.Results indicate that the mesoporous structure provides abundant active site and storage space for dead lithium.With the synergistic effect of this structure and lithophilic func-tional groups(-COOH),the reversibility of hard carbon/lithium metal hybrid anode is maintained,pro-moting uniform deposition of lithium metal and alleviating formation of lithium dendrites.The hybrid anode maintains a 99.5％Coulombic efficiency(CE)after 260 cycles at a specific capacity of 500 mAh/g.This work provides new insights into the hybrid anodes formed by carbon-based materials and lithium metal with high specific energy and fast charging ability.

Hard carbon/Li metal hybrid anodeMesoporous structureSurface oxygen functional groupFast chargingLithium batteries

Fang Yan、Yan Liu、Yuan Li、Yan Wang、Zicen Deng、Meng Li、Zhenwei Zhu、Aohan Zhou、Ting Li、Jingyi Qiu、Gaoping Cao、Shaobo Huang、Biyan Wang、Hao Zhang

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School of Chemistry and Biological Engineering,University of Science and Technology,Beijing 100083,China

Research Institute of Chemical Defense,Beijing 100191,China

National Base for International Science & Technology Cooperation,School of Chemistry,Xiangtan University,Xiangtan 411105,Hunan,China

Materials and Manufacturing Department,Beijing University of Technology,Beijing 100124,China

College of Physics and Engineering,Henan University of Science and Technology,Luoyang 471023,Henan,China

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National Natural Science Foundation of China

22075320

2024

10.1016/j.jechem.2023.09.019

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)：2024.88(1)
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