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.

基于LIMN_2O_4的尖晶石型氧化物是锂离子电池中使用的最有前途的阴极材料之一，因为它们的低成本，高理论能量密度。为了提高其周期性能，几个研究小组研究了lim_ymn_ <2-y> o_4的锰取代的Spionels的性质（M = CR，Ni，Co等）。这些尖晶石显示出4.1 V高原的能力下降，但是据报道CO，NI和CR掺杂的尖晶石的循环寿命得到了改善。此外，最近CO，NI和CR掺杂的尖晶石在4.5 V的电势处显示可逆的氧化还原过程，这对于阐明结构变化，电荷和放电过程中的结构变化，价值变化很重要，以了解其电化学性能。在本研究中，制备了B位掺杂型尖晶石（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)。

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。

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)。