Abstract
To overcome the drawbacks of the structural instability and poor conductivity of SnO2-based anode materials, a hollow core–shell-structured SnO2@C@Co-NC (NC=N-doped carbon) composite was designed and synthesized by employing the heteroatom-doping and multiconfinement strategies. This composite material showed a much-reduced resistance to charge transfer and excellent cycling performance compared to the bare SnO2 nanoparticles and SnO2@C composites. The doped heteroatoms and heterostructure boost the charge transfer, and the porous structure shortens the Li-ion diffusion pathway. Also, the volume expansion of SnO2 NPs is accommodated by the hollow space and restricted by the multishell heteroatom-doped carbon framework. As a result, this structured anode material delivered a high initial capacity of 1559.1 mA h g−1 at 50 mA g−1 and an initial charge capacity of 627.2 mA h g−1 at 500 mA g−1. Moreover, the discharge capacity could be maintained at 410.8 mA h g−1 after 500 cycles with an attenuation rate of only 0.069 % per cycle. This multiconfined SnO2@C@Co-NC structure with superior energy density and durable lifespan is highly promising for the next-generation lithium-ion batteries.
Original language | English |
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Pages (from-to) | 12882-12890 |
Number of pages | 9 |
Journal | Chemistry - A European Journal |
Volume | 26 |
Issue number | 56 |
DOIs | |
State | Published - 6 Oct 2020 |
Keywords
- core–shell structures
- doping
- electrochemistry
- nanoparticles
- nanostructures