Analysis of Electrochemical Lithium Topochemical Reactions into Superstructure Spinel Oxides

超结构尖晶石氧化物的电化学锂拓扑化学反应分析

• 批准号: 08455396
• 负责人: YAO Takeshi
• 金额: $ 4.8万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455396/
• 关键词: Lithium Batteries; Spinel; Crystal Structure; Cathode Material; スピネル型酸化物; トポケミカル反応; 構造解析; X線回折

LiMn_2O_4 based spinel type oxides are one of the most promising cathode materials used in lithium ion batteries because their low cost, high theoretical energy density. In order to improve their cycle performance, several research groups have investigated the properties of manganese-substituted spionels of LiM_yMn_<2-y>O_4(M=Cr, Ni, Co, etc.). These spinels show a decreased capacity on the 4.1 V plateau, however improved cycle life was reported for Co, Ni, and Cr doped spinels. Furthermore, recently Co, Ni, and Cr doped spinels show reversible redox processes at potentials above 4.5 V.It is important to clarify the structural change, valency change during charge and discharge process in order to understand their electrochemical properties. In the present study, B-site doped spinels (LiM_yMn_<2-y>O_4 ; M=Cr, Ni, Co) were prepared. X-ray diffraction, X-ray absorption Fine Structure, and electrochemical studies were carried out.

LiMn_2O_4基尖晶石型氧化物因其成本低、理论能量密度高而成为锂离子电池极具发展前景的正极材料之一。为了提高其循环性能，几个研究小组研究了LiM_yMn_<2-y>O_4（M=Cr, Ni， Co等）的锰取代螺旋体的性能。这些尖晶石在4.1 V平台上表现出容量下降，而Co， Ni和Cr掺杂尖晶石的循环寿命有所提高。此外，Co、Ni和Cr掺杂尖晶石在4.5 V以上的电位下表现出可逆的氧化还原过程。弄清其在充放电过程中的结构变化、价态变化对了解其电化学性质具有重要意义。本研究制备了b位掺杂尖晶石（LiM_yMn_<2-y>O_4； M=Cr, Ni, Co）。进行了x射线衍射、x射线吸收、精细结构和电化学研究。

项目成果

K.Kanamura, H.Naito, T.Yao adn Z.takehara :""Structural Change of Spinel LiMn_2O_4 Induced by Extraction of Lithium"" J.Mater.Chem.6. 33-36 (1996)

K.Kanamura、H.Naito、T.Yao 和 Z.takehara：“锂萃取引起尖晶石 LiMn_2O_4 的结构变化”J.Mater.Chem.6。

T.YAO et.al.: "Structural Change of Spinel LiMn_2O_4 Induced by Extraction of Lithium." J.Matereials Chemistry. 6. 33-36 (1996)

T.YAO 等人：“锂提取引起尖晶石 LiMn_2O_4 的结构变化”。

八尾 健,他: "Structual Change of the LiMn_2O_4 Spinel Structure Induced by Extraction of Lithium" Journal of Materiel Chemistry. 6. 33-36 (1996)

Ken Yao 等人：“锂提取引起的 LiMn_2O_4 尖晶石结构的结构变化”材料化学杂志 6. 33-36 (1996)。

八尾 健 他: "陽イオンサイトから見たスピネル型酸化物" 材料科学. 33. 13-18 (1996)

Ken Yao 等人：“从阳离子位点看到的尖晶石型氧化物”材料科学 33. 13-18 (1996)。

T.Yao :""Cation Sites in Spinel Oxides"" Zairyo-Kagaku. 33. 13-18 (1996)

T.Yao：“尖晶石氧化物中的阳离子位点”Zairyo-Kagaku。