Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 9, Pages 4858-4863Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am301202a
Keywords
lithium-ion batteries; hybrid materials; cathode; lithium-excess layered materials; graphene
Funding
- National Basic Research Program of China [2012CB932900, 2011CB935700]
- National Natural Science Foundation of China [91127044, 21121063]
- WCU program through NRF
- MEST [R32-2009-000-20074-0]
- Chinese Academy of Sciences
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Graphene-wrapped lithium-excess layered hybrid materials (Li2MnO3 center dot LiMO2, M = Mn, Ni, Co, hereafter abbreviated as LMNCO) have been synthesized and investigated as cathode materials for lithium-ion batteries. Cyclic voltammetry measurement shows a significant reduction of the reaction overpotential in benefit of the graphene conducting framework. The electrochemical impedance spectroscopy results reveal that the graphene can greatly reduce the cell resistance, especially the charge transfer resistance. Our investigation demonstrates that the graphene conducting framework can efficiently alleviate the polarization of pristine LMNCO material leading to an outstanding enhancement in cell performance and cycling stability. The superior electrochemical properties support the fine hybrid structure design by enwrapping active materials in graphene nanosheets for high-capacity and high-rate cathode materials.
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