Synthesis of Lithium Storage Intermetallic Compounds for Rechargeable Battery and their Structural Analysis using X-ray and Neutron

可充电电池用储锂金属间化合物的合成及其X射线和中子结构分析

• 批准号: 15550161
• 负责人: SAKAGUCHI Hiroki
• 金额: $ 2.37万
• 依托单位: National University Corporation Tottori University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15550161/
• 关键词: CeSn_3; LaSn_3; Lithium storage intermetallic compounds; Anode material; Lithium secondary battery

Recently, lithium storage intermetallic compounds have been extensively investigated because of an increasing demand for higher capacity anode for next generation's rechargeable lithium batteries. To enhance volumetric charge and discharge capacities of the anode, we focused on rare-earth elements due to their large densities, and proposed new materials, such as CeSn_3 and LaSn_3. The volumetric capacities of CeSn_3 and LaSn_3 electrodes were about three times larger than those of graphite one practically used, suggesting an attractive alternative electrode. The electrode, however, exhibited poor reversibility at the first charge-discharge cycle and cyclability as well as other alloy electrodes previously reported.The drawbacks have been overcome by adding lithium to CeSn_3 and LaSn_3 using mechanical alloying. To discuss the improvement of electrode performance for mechanically lithiated CeSn_3 (Li_xCeSn_3) electrodes, the charge-discharge mechanism was investigated by electrochemical measurements and some experiments using X-ray and neutron. As a result, it was found that the Li_xCeSn_3 consists of CeSn_3 and unknown Li-Ce-Sn phases. The CeSn_3 phase of active material appears to be finely dispersed in the Li-Ce-Sn phase which plays a role as an inactive matrix. Therefore, it is considered that the CeSn_3 of small grain size facilitated the escape of lithium which had deeply inserted in the grain and the Li-Ce-Sn matrix released the stress generated at lithium insertion.

近年来，由于下一代可充电锂电池对高容量阳极的需求不断增加，锂存储金属间化合物得到了广泛的研究。为了提高阳极的体积充放电能力，我们将重点放在稀土元素上，因为它们的密度很大，并提出了新的材料，如CeSn_3和LaSn_3。CeSn_3和LaSn_3电极的体积容量大约是实际使用的石墨电极的3倍，表明这是一个有吸引力的替代电极。然而，该电极在第一次充放电循环中表现出较差的可逆性和可循环性，以及先前报道的其他合金电极。采用机械合金化的方法在CeSn_3和LaSn_3中加入锂，克服了上述缺点。为了探讨机械锂化CeSn_3 （Li_xCeSn_3）电极性能的改善，通过电化学测量和x射线和中子实验研究了其充放电机理。结果发现，Li_xCeSn_3由CeSn_3和未知Li-Ce-Sn相组成。活性材料的CeSn_3相分散在Li-Ce-Sn相中，起到了非活性基体的作用。因此可以认为，小晶粒尺寸的CeSn_3有利于深嵌在晶粒中的锂离子逸出，Li-Ce-Sn基体释放了锂离子插入时产生的应力。

项目成果

リチウム二次電池用電極及びその製造方法

锂二次电池用电极及其制造方法

• 发表时间: 2004

H.Honda, H.Sakaguchi, I.Tanaka, T.Esaka: "Anode Behaviors of Magnesium-Antimony Intermetallic Compound for Lithium Secondary Battery"J.Power Sources. 123. 216-221 (2003)

H.Honda、H.Sakaguchi、I.Tanaka、T.Esaka：“锂二次电池镁锑金属间化合物的阳极行为”J.Power Sources。

Improved Performance of Solid-State Metal Hydride Batteries Using Heteropolyacid Hydrate as an Electrolyte

使用杂多酸水合物作为电解质改善固态金属氢化物电池的性能

• 发表时间: 2004
• 期刊: Electrochemistry 72・10
• 作者: Yasutaka Nagao;Hiroki Sakaguchi;Hitohiko Honda;Toshiharu Fukunaga;Takao Esaka;T.Esaka;K.Hatakeyama
• 通讯作者: K.Hatakeyama

真空蒸着法により調製したリチウム二次電池用合金Mg_2Geの負極特性

真空蒸镀法制备锂二次电池用合金Mg_2Ge负极性能

• 期刊: Electrochemistry (in press)
• 作者: Hiroki Sakaguchi;Hitohiko Honda;Yuichi Akasaka;Takao Esaka;坂口裕樹
• 通讯作者: 坂口裕樹

Lithium Storage Intermetallic Compounds as Anode Materials for Lithium Secondary Batteries

锂二次电池负极材料储锂金属间化合物

• 发表时间: 2004
• 期刊: The Institute of Electronics, Information and Communication Engineers, Technical Report of IEICE 103(595)
• 作者: Hiroki Sakaguchi;Takao Esaka
• 通讯作者: Takao Esaka