title: Superior hybrid cathode material containing lithium-excess layered material and graphene for lithium-ion batteries.
abstract: Graphene-wrapped lithium-excess layered hybrid materials (Li(2)MnO(3)·LiMO(2), 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.
authors.affiliation: Key Laboratory of Molecular Nanostructure and Nanotechnology, and Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, PR China.
authors.forename: Ke-Cheng
authors.initials: KC
authors.lastname: Jiang
authors.forename: Xing-Long
authors.initials: XL
authors.lastname: Wu
authors.forename: Ya-Xia
authors.initials: YX
authors.lastname: Yin
authors.forename: Jong-Sook
authors.initials: JS
authors.lastname: Lee
authors.forename: Jaekook
authors.initials: J
authors.lastname: Kim
authors.forename: Yu-Guo
authors.initials: YG
authors.lastname: Guo
mesh_terms: D011211:Electric Power Supplies; D055664:Electrochemical Techniques; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry
chemical_list: D010087:Oxides; D006108:Graphite; D008094:Lithium