Investigation of cation-exchanged vanadium pentoxide xerogels as the cathode materials for lithium rechargeable battery

阳离子交换五氧化二钒干凝胶作为锂二次电池正极材料的研究

• 批准号: 12650816
• 负责人: MIURA Takashi
• 金额: $ 1.98万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650816/
• 关键词: vanadium pentoxide; xerogel; cation-exchange; sodium; calcium; lanthanum; rechargeable lithium battery

Cation-exchanged vanadium pentoxide xerogels (VXG) have been prepared and investigated as the cathode materials for rechargeable lithium battery. The protons included in original VXG could be exchanged to sodium (Na^+), calcium (Ca^<2+>) and lanthanum (La^<3+>). The interlayer distances of these cation-exchanged VXG's were larger than that of original VXG. Removal of water molecules in the cation-exchanged VXG's resulted in shrinkage of the interlayer distances. The interlayer distances of the dehydrated cation-exchanged VXG's were 〜0.89 nm since the ionic radii of Na^+, Ca^<2+> and La^<3+> are close to each other.Thin film electrodes of the cation-exchanged VXG's were prepared to perform the electrochemical insertion of lithium. The extent of lithium inserted electrochemically into the cation-exchanged VXG's was larger than that for original VXG, probably due to the enlargement of the interlayer distance, which may enhance the diffusion of lithium in VXG. The largest extent of lithium was observed for La-exchenaged VXG since the number of lithium accommodating sites was the largest in other cation-exchanged VXG's.

已制备并研究了阳离子交换五氧化二钒干凝胶（VXG）作为可充电锂电池的正极材料。原始VXG中包含的质子可以交换为钠(Na^+)、钙(Ca^2+)和镧(La^3+)。这些阳离子交换VXG 的层间距离大于原始VXG 的层间距离。阳离子交换 VXG 中水分子的去除导致层间距离缩小。由于Na^+、Ca^2+和La^3+的离子半径彼此接近，脱水后的阳离子交换VXG的层间距离约为0.89 nm。制备了阳离子交换VXG的薄膜电极以进行锂的电化学插入。锂以电化学方式插入到阳离子交换的 VXG 中的程度比原始 VXG 更大，这可能是由于层间距离的增大，这可能增强了 VXG 中锂的扩散。在 La 交换的 VXG 中观察到最大程度的锂，因为锂容纳位点的数量在其他阳离子交换的 VXG 中是最大的。

项目成果

Mayumi Kamata, Gaku Oriji, Yasushi Katamaya, Takashi Miura, Tomiya Kishi: "Lithium insertion behavior of ε-Cu_<0.9>V_2O_5"Solid State Ionics. 146. 95-100 (2002)

Mayumi Kamata、Gaku Oriji、Yasushi Katamaya、Takashi Miura、Tomiya Kishi：“ε-Cu_<0.9>V_2O_5 的锂插入行为”固态离子学 146. 95-100 (2002)。

Mayumi Kamata, Gaku Oriji, Yasushi Katayama, Takashi Miura, Tomiya Kishi: "Lithium insertion behavior of ε-Cu_<0.9>V_2O_5"Solid State Ionics. 146. 95-100 (2002)

Mayumi Kamata、Gaku Oriji、Yasushi Katayama、Takashi Miura、Tomiya Kishi：“ε-Cu_<0.9>V_2O_5 的锂插入行为”固态离子学 146. 95-100 (2002)。

Mayumi Kamata, Gaku Oriji, Yasushi Katamaya, Takashi Miura, and Tomiya Kishi: "Lithium insertion behavior of ε-Cu_<0.9>V_2O_5"Solid State Ionics. 146. 95-100 (2002)

Mayumi Kamata、Gaku Oriji、Yasushi Katamaya、Takashi Miura 和 Tomiya Kishi：“ε-Cu_<0.9>V_2O_5 的锂插入行为”固态离子学 146. 95-100 (2002)。