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Structural Design and Synthesis of an SnO2@C@Co-NC Composite as a High-Performance Anode Material for Lithium-Ion Batteries |
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| Authors: | Qiongguang Li Dr. Yanhong Wang Dr. Qiangqiang Tan Dr. Ziyi Zhong Dr. Fabing Su |
| Affiliation: | 1. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049 P.R. China State Key Laboratory of Multiphase Complex Systems, CAS Key Laboratory of Green Process Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190 P.R. China;2. State Key Laboratory of Multiphase Complex Systems, CAS Key Laboratory of Green Process Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190 P.R. China;3. State Key Laboratory of Multiphase Complex Systems, CAS Key Laboratory of Green Process Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190 P.R. China Zhongke Langfang Institute of Process Engineering, Fenghua Road No 1, Langfang Economic & Technical Development Zone, Langfang, 065001 Hebei Province, P.R. China;4. College of Engineering, Guangdong Technion Israel Institute of Technology (GTIIT), 241 Daxue Road, Jinping District, Shantou, 515063 P.R. China |
| 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. |
| Keywords: | core–shell structures doping electrochemistry nanoparticles nanostructures |