Electrochemical Recovery and Isotope Separation of Lithium Employing Solid Electrolyte

固体电解质锂的电化学回收和同位素分离

• 批准号: 08555153
• 负责人: ITOH Mitsuru
• 金额: $ 5.57万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555153/
• 关键词: Lithium recovery; Isotope separation; Electrolysis; Solid electrolyte; ペロブスカイト; モルキュラーダイナミックス; リチウムイオン伝導体; イオン伝導のメカニズム

For the purpose of electrochemical recovery of Lithium and its isotope separation, feasibility of high Lithium ion conductor (La, Li)TiO_3 for the application of solid electrolyte separator was checked. Ion substitution for (La, Li)TiO_3 revealed that (La, Li)TiO_3 is the best material as a solid electrolyte. Using its crucibles and pellets, electrolysis was carried out for the cell.Pt, distilled water | Li^+ | LiCl solution, Pt.Lithium ion was recovered to the anode but electrolytic efficiency was less than 80%, which is attributed to the incorporation of proton into the electrolyte during electrolysis. Cracks were sometimes found to form inside the electrolyte during electrolysis. These problems are considered to be avoided by employing non-water solvent and fine-grained sintered body.Molecular dynamics simulation for the Lithium migration revealed that the transport mechanism deduced from the previous our experimental results is crucial for the evolution of high Lithium ion conductivity. The MD simulation has also clearly shown that the structure of (La, Li)TiO_3 is not optimized.

以电化学回收锂及其同位素分离为目的，考察了高锂离子导体（La，Li）TiO_3作为固体电解质隔膜的可行性。离子取代实验表明，（La，Li）TiO_3是最佳的固体电解质材料。使用其坩埚和小球对电池进行电解。Pt，蒸馏水|Li^+|锂离子被回收到阳极，但电解效率小于80%，这归因于电解期间质子并入电解质中。在电解过程中，有时发现电解质内部形成裂纹。采用非水溶剂和细晶烧结体可以避免这些问题。锂离子迁移的分子动力学模拟表明，由我们先前的实验结果推导出的输运机制对高锂离子电导率的形成至关重要。分子动力学模拟也清楚地表明（La，Li）TiO_3的结构不是最佳的。

项目成果

Tetsuhiro Katsumata, Yoshiyuki Inaguma, and Mitsuru Itoh: "Effect of Nb Exchange in the Lithium Ion Conducting Perovskite" Solid State Ionics. (in press).

Tetsuhiro Katsumata、Yoshiyuki Inaguma 和 Mitsuru Itoh：“锂离子传导钙钛矿中 Nb 交换的效应”固态离子学。

Yoshiyuki Inaguma: "Influences of Carrier Concentration and Site Percoration in Lithium Ion Conductivity in Perovskite-type Oxide" Solid State Ionics. 86-88. 165-169 (1996)

Yoshiyuki Inaguma：“钙钛矿型氧化物中的载流子浓度和位点渗透对锂离子电导率的影响”固态离子学。

Tetsuhiro Katsumata, Yoshiyuki Inaguma, Mitsuru Itoh, and Katsuyuki Kawamura: "Molecular dynamics Simulation on the high lithium ion conductor La_<0.6>Li_<0.2>TiO_3" Journal of Ceramic society of Japan. (submitted).

Tetsuhiro Katsumata、Yoshiyuki Inaguma、Mitsuru Itoh 和 Katsuyuki Kawamura：“高锂离子导体 La_<0.6>Li_<0.2>TiO_3 的分子动力学模拟”日本陶瓷学会杂志。

伊藤 満: "ペロブスカイト型リチウムイオン伝導体" 電池技術. 8. 89-99 (1996)

Mitsuru Ito：“钙钛矿型锂离子导体”电池技术。8. 89-99 (1996)。

Yoshiyuki Inaguma: "Effect of Substitution and Pressure on Lithium Ion Conductivity in Perovskites Ln_<1/2>Li_<1/2>TiO_3(Ln=La, Pr, Nd, and Sm)" Journal of Physics and Chemistry of Solids. 58・6. 843-852 (1997)

Yoshiyuki Inaguma：“取代和压力对钙钛矿 Ln_<1/2>Li_<1/2>TiO_3(Ln=La、Pr、Nd 和 Sm) 中锂离子电导率的影响”《固体物理与化学杂志》58。・6.843-852 (1997)