期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 49, 页码 27087-27095出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b05819
关键词
graphene; SnO2; xerogel; hybrids; Li-ion battery; anode
资金
- NSF [MRI-1229514]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1305694] Funding Source: National Science Foundation
SnO2 has been considered as one of the most promising anode materials for Li-ion batteries due to its theoretical ability to store up to 8.4 Li+ However, it suffers from poor rate performance and short cycle life due to the low intrinsic electrical conductivity and particle pulverization caused by the large volume change upon lithiation/delithiation. Here, we report a facile synthesis of graphene/SnO2 xerogel hybrids as anode materials using epoxide-initiated gelation method. The synthesized hybrid materials (19% graphene/SnO2 xerogel) exhibit excellent electrochemical performance: high specific capacity, stable cyclability, and good rate capability. Even cycled at a high current density of 1 A/g for 300 cycles, the hybrid electrode can still deliver a specific capacity of about 380 inAh/g, corresponding to more than 60% capacity retention. The incorporation of graphene sheets provides fast electron transfer between the interfaces of the graphene nanosheets and the SnO2 and a short lithium ion diffusion path. The porous structure of graphene/xerogel and the strong interaction between SnO2 and graphene can effectively accommodate the volume change and tightly confine the formed Li2O and Sn nanoparticles, thus preventing the irreversible capacity degradation.
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