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High-Voltage Li-ion Batteries and Materials

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SEMINAR

The State Key Lab of

High Performance Ceramics and Superfine Microstructure

Shanghai Institute of Ceramics, Chinese Academy of Sciences 

  中 国 科 学 院 上 海 硅 酸 盐 研 究 所 高 性 能 陶 瓷 和 超 微 结 构 国 家 重 点 实 验 室 

High-Voltage Li-ion Batteries and Materials 

  廖世杰 博士 

  台湾工业技术研究院材料与化工研究所   

  时间:2017年4月18日(星期二)下午3: 30 

  地点: 4号楼14楼第二会议室 

  欢迎广大科研人员和研究生参与讨论! 

  联系人:郭向欣(1032) 

  Abstract: 

  Extensive researches on new high-voltage cathode materials have been carried out in recent years to meet the increasing demand of high-energy batteries for electric vehicles. In this talk, we will present our recent research progress on the 4V lithium-manganese-iron phosphate (LMFP) and 4.7V lithium-nickel-manganese oxide (LiNi0.5Mn1.5O4, LNMO) as the cathode for Li-ion batteries. The as-synthesized olivine LMFP with a tap density of 1.2 g/cm3 had discharge capacities of 150 mAh/g, 145mAh/g, 131 mAh/g, and 118 mAh/g at a discharge rate of 0.1C, 1C, 5C, and 10C, respectively. On the other hand, the spinel LNMO with a tap density of 2.2 g/cm3 had discharge capacities of 135 mAh/g, 120 mAh/g, and 100 mAh/g at a discharge rate of 0.2C, 10C and 20C, respectively. The LMFP and LNMO cells (35×60×5 mm) with the graphite (G) or Li4Ti5O12 (LTO) anode were also made and evaluated. The energy densities of LMFP-G and LMFP-LTO cells respectively reached 120 Wh/kg and 70 Wh/kg. In addition, we found that the composite cathode of LMFP and NMC provided the cells with high energy (up to 170 Wh/kg), power (up to 8C) and thermal stability simultaneously. As a comparison, the energy densities of LNMO-G and LNMO-LTO cells were 200 Wh/kg and 90 Wh/kg, respectively. It is necessary to note that all LNMO cells suffered from the problem of gas evolutions. To alleviate gassing, surface coating of LNMO was employed and found to also significantly improve the high-temperature cyclability of cells. The underlying mechanisms of such effects will be presented.

 
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