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- W2783281702 abstract "Li-rich LiSi alloy-type anodes with high tap density, specific capacity and cycling stability are highly demanded for pairing Li-free cathodes to develop high energy Li ion batteries (LIBs). Here we fabricated for the first time a type of micron-scale composite of Li21Si5 and carbon with outstanding electrochemical performance, which has unique amorphous core-nanocomposite shell structure (denoted as a-Li21Si5@C). The thin graphene stacks in the nanocomposite shell have multiple functions of constraining effectively the volume change during cycling, providing numerous pathways for rapid charge transport and inhibiting side reactions at particle surface. Benefit from the special configuration, the a-Li21Si5@C composite has a reversible specific capacity of 870 mAh g−1 (2479 mAh g−1 evaluated from Si composition). Moreover, the a-Li21Si5@C composite retains a specific capacity of 582 mAh g−1 after 100 cycles, which exhibits a remarkably increased stability as compared with the previous micron-scale LiSi alloys. The energy density of the full cell constructed by the present composite and sulfur is evaluated as 2.6 times high as that of the commercial LIBs. The studies pave the way for developing micron-scale Li-rich composites as high-performance anode candidates for advanced LIBs." @default.
- W2783281702 created "2018-01-26" @default.
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- W2783281702 date "2018-03-01" @default.
- W2783281702 modified "2023-10-15" @default.
- W2783281702 title "Li Si C anode material with amorphous core – nanocomposite shell structure" @default.
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- W2783281702 doi "https://doi.org/10.1016/j.mtener.2018.01.001" @default.
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