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.

阳离子交换的五氧化聚凝结凝胶（VXG）已被制备并作为可充电锂电池的阴极材料进行了研究。原始VXG中包含的质子可以交换为钠（Na^+），钙（Ca^<2+>）和灯笼（La^<3+>）。这些阳离子交换的VXG的层间距离大于原始VXG的距离。阳离子交换VXG中的水分子的去除导致层间距离收缩。由于Na^+，Ca^<2+>>和La^<3+>彼此靠近，因此脱水阳离子脱水的VXG的层间距离为〜0.89 nm。阳离子交换的VXG的薄膜电极已准备好执行锂的电化学插入。将电化学插入阳离子交换的VXG的锂的程度大于原始VXG的含量，这可能是由于层间距离的膨胀，这可能会增强锂在VXG中的扩散。对于LA-EXCHENED VXG，观察到锂的最大程度，因为利用位点的锂数量是其他阳离子交换的VXG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)。