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）

　　报告摘要

　　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.

　　报告人简介

　　廖世傑博士任職於工業技術研究院材料與化工研究所，擔任奈米能源材料研究室研究主任及正研究員。近年他研究的重點在鋰離子電池及材料開發。廖博士同 時也是現任台灣粉體及粉末冶金協會祕書長。 廖博士 1996 年畢業於美國羅格斯大學(Rutgers U.-New Brunswick)陶瓷材料工 程博士。博士論文”奈米二氧化鈦(TiO2)之超高壓/低溫燒結及理論模擬”獲 Hoechst Celanese 最佳研究獎。廖博士畢業後至 1999 年期間在羅格斯奈米材料中心擔任博士後研究員，研究火焰法合成及超高壓燒結奈米粉體。廖博士1999 年八月返台加入工 研院材料所展開奈米粉體合成與應用、鋰電池電極粉體及儲氫合金研究，2000年獲 美國 Metal Powder Industries Federation 最佳論文獎，已發表三十餘篇 SCI 論文，17項發明專利，並獲得多項工研院及經濟部創新研究獎。已成功技術移轉奈米粉體及鋰電池材料技術如鈷酸鋰 (LiCoO2)、鎳鈷酸鋰 (LiNi0.8Co0.2-xMxO2)、三元正極 (LNi1-x-yCoxMnyO2)、磷酸鋰鐵(LiFePO4)、磷酸鋰鐵錳(LiFexMn1-xPO4)、矽/碳(Si/C) 負極、鈦酸鋰(Li4Ti5O12)及機能性電解液給國內廠商並順利量產。此外，廖博士有多項與國際著名公司如 Kaneka Corp., Nissan Chemical, Corning Inc., PPG Industries Inc.,