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Diboron Carbon Current Collector for Stable Anode-Free Lithium Metal Batteries
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DOI：10.1021/acs.nanolett.6c01274.png)
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Abstract
En 中文
Anode-free lithium metal batteries (ALMBs) are promising candidates for next-generation high-energy-density storage devices. However, conventional Cu current collectors (Cu-CC) suffer from nonuniform Li plating/stripping because of their poor lithiophilicity. Here, we report mechanochemical synthesis of diboron carbon (B2C) for the first time, a material previously predicted only theoretically, and tune its electrical conductivity from as-grown ∼0.01–0.05 S cm–1 to C-rich B2C ∼0.23–0.28 S cm–1, enabling its application as a functional current-collector in ALMBs. Pristine B2C exhibits anode-like electrochemical behavior, whereas increasing the carbon content (B:C from 64.3:35.7 to 47.4:52.6 weight%) shifts its function toward a current-collector-like electrode that supports reversible Li plating/stripping while minimizing Li loss. Anode-free full cells using C-rich B2C deliver ∼500 stable cycles with an average Coulombic efficiency of ∼94%, markedly outperforming Cu-based cells. These findings identify C-rich B2C as an effective alternative to conventional Cu-CC in ALMBs.
Keywords:
Batteries
Electrochemical cells
Electrodes
Lithium
Metals
anode-free batteries
lithophilic
diboron carbon
current collector
Journal
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9.1
Papers:
2.7W
Citations:
16.5W
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Cited Papers