INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Research Progress on the Surface Carbon Coating Modification of LiFePO4 Cathode Material for Lithium Ion Batteries |
YUAN Meimei1,2, XU Ruhui1,2, YAO Yaochun1,2
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1 The National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China 2 Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China |
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Abstract New energy materials play an important role for the sustainable development of the human society. Ferrous lithium phosphate(LiFePO4) as one of the cathode materials of lithium-ion battery, with low-pollution, high safety, low-cost and other some merits can conduct the lithium reversible intercalation and deintercalation and complete the charge and discharge orderly at certain current density, so, it is a promising battery cathode material and has made remarkable development and progress. Its crystal structure is olive type and the change of volume structure is a little and maintains relatively stable, all of which guarantee the collapse and deformation of the structure under the condition of charge and discharge. However, the two deadly drawbacks that hinder the development of LiFePO4 material are the low electronic and ionic conductivity, which lead to the poor cycling and rate performance of LiFePO4. Therefore, in response to those questions, many improving methods are given by people, such as dropping other elements on Li and Fe site, nanoparticles and surface coating of conductive materials. Yet, coating modification on the surface of LiFePO4 cathode material to improve its rate performance and cycle life is the most widely used and economically feasible method. Carbon material is widely used in the coating of lithium iron phosphate because of its low-cost, non-toxic, environment-friendly, rich raw material and high conductivity. This paper mainly introduces the research progress of modified LiFePO4 cathode materials with surface carbon coating, and the selection of carbon sources, carbonization mechanism and surface chemical reaction are summarized.
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Published: 05 November 2020
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Fund:This work was financially supported by the National Natural Science Foundation of China (51364021) and Natural Science Foundation of Yunnan Province(2014FA025). |
About author:: Meimei Yuan, master, studied in the School of Metallurgy and Energy Engineering, Kunming University of Science and Technology, majoring in non-ferrous metal metallurgy, and research direction was lithium iron phosphate cathode material for lithium ion battery. Yaochun Yao, Professor, Ph.D. supervisor, Kunming Middle-aged Academic and Technology Leader, visiting scholar at Tokyo Institute of Technology. The deputy director of the National Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology and Yunnan Provincial Advanced Battery Materials and Engineering Laboratory, director of Kunming Energy Conservation and New Energy Vehicle Power Battery and Key Materials Research Center, deputy director of Institute of Vacuum Metallurgy and Materials in Kunming University of Science and Technology. During the past years, he has carried out varieties of projects for the state, provincial and municipal government, published more than 160 academic papers in domestic and foreign journals, obtained more than 20 national patents, and accomplished R & D for high-tech products and industrialization projects. Main research directions: R&D and industrialization of lithium-ion battery and its key materials, preparation and simulation of powder materials, high purity powder purification, plasma heat treatment, research and development of new energy vehicle power matching system. |
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