Studies on Structures and Anode Behaviors of Lithium Storage Intermetallic Compounds

储锂金属间化合物的结构和负极行为研究

• 批准号: 13650886
• 负责人: SAKAGUCHI Hiroki
• 金额: $ 1.79万
• 依托单位: 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: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650886/
• 关键词: Mg_2Me; Mg_2Sn; A1Sb; Mg_3Sb_2; Lithium storage intermetallic; Lithium secondary battery; Anode active material; Neuron diffraction; 負極材料; リチウム貯蔵; 金属間化合物; 負極; 中性子散乱

1. The local structure of Li_xMg_2Ge, which is a candidate for anode materials of lithium secondary batteries, was investigated using both X-ray diffraction and neutron diffraction. It was found that the nearest interatomic distance of the Ge-Mg increases slightly in electrochemically lithiated Mg_2Ge lattice to form a solid solution.2. To obtain a new anode material of lithium battery, electrochemical properties were investigated on Mg_2Sn synthesized by mechanical alloying (MA) method. As a result, we found that the reversible insertion-extraction of a large amount of lithium can electrochemically occur in the Mg_2Sn. The Mg_2Sn changed its crystal structure from cubic to orthorhombic with increasing MA time. The compound exhibiting good performances as an anode had an orthorhombic phase. The discharge capacity of the Mg_2Sn electrode was still maintained at 250-300 mA h g^<-1> ever after the 20 times charge-discharge cycling.3. A1Sb was synthesized using MA. Electrochemical performa … More nce was examined on the electrodes of A1Sb synthesized with different MA time. The first charge (lithium-insertion) capacity of the A1Sb electrodes decreased with increasing MA time. The discharge capacity on repeating charge-discharge cycle, however, did not show the same dependence. The electrode consisting of the 20 h MA sample exhibited the longest charge-discharge cycle life, suggesting that there is the optimum degree of internal energy, derived from the strain and/or the amorphization due to MA. These results were evaluated using X-ray diffraction and differential scanning calorimetry.4. Electrochemical tests demonstrated that the initial charge and discharge capacities of the Mg_2Sb_2 electrode were ca. 850 and 600 mA h g^<-1> which were superior to those of the conventional graphite electrode. XRD of the Mg_2Sb_2 electrodes showed that several lithium-containing compounds such as LiMgSb and Li_3Sb were successively formed during the insertion of lithium into Mg_3Sb_2. The cycle life performance of mechanically lithiated (LiMgSb) electrode was significantly enhanced in comparison with that of the Mg_3Sb_2 electrode. Less

1.利用X射线衍射和中子衍射研究了锂二次电池负极材料Li_xMg_2Ge的局域结构，发现电化学锂化过程中Ge-Mg的最近原子间距离略有增加。 Mg_2Ge晶格形成固溶体。2．为了获得新型锂电池负极材料，对Mg_2Sn进行了电化学性能研究。结果表明，随着MA时间的增加，Mg_2Sn中可以发生大量锂的可逆嵌入-脱出。由于阳极具有斜方相，因此表现出良好的性能，Mg_2Sn电极的放电容量仍保持在250-300。 20次充放电循环后的mA h g^<-1>。3.使用MA合成了不同MA时间合成的A1Sb的电化学性能。 ）A1Sb 电极的容量随着 MA 时间的增加而降低，但重复充放电循环的放电容量并未表现出相同的依赖性。 MA 样品表现出最长的充放电循环寿命，表明存在由 MA 引起的应变和/或非晶化产生的最佳内能。这些结果是使用 X 射线衍射和差示扫描量热法进行评估的。4电化学测试表明，Mg_2Sb_2电极的初始充电和放电容量分别为约850和600mAh g^-1，优于传统石墨电极。 Mg_2Sb_2电极表明，在锂嵌入Mg_3Sb_2过程中，相继形成了LiMgSb和Li_3Sb等多种含锂化合物，与Mg_3Sb_2电极相比，机械锂化（LiMgSb）电极的循环寿命性能显着提高。

项目成果

H. Skaguchi and T. Esaka: "Lithium Storage Intermetallic Compounds as Negative Active Materials for Secondary Batteries"GS News Technical Report. 60-2. 1-7 (2001)

H. Skaguchi 和 T. Esaka：“锂存储金属间化合物作为二次电池负极活性材料”GS News 技术报告。

H.Sakaguchi, Y.Satake, K.Hatakeyama, S.Fujine, K.Yoneda, M.Matsubayashi, T.Esaka: "Analysis of Hydrogen Distribution in Hydrogen Storage Alloy Using Neutron Radiography"J. Alloys & Comp.. (印刷中).

H.Sakaguchi、Y.Satake、K.Hatakeyama、S.Fujine、K.Yoneda、M.Matsubayashi、T.Esaka：“利用中子射线照相分析储氢合金中的氢分布”J. Alloys & Comp..（打印） 期间）。

H.Sakaguchi, K.Hatakeyama, S.Kobayashi, T.Esaka: "Hydrogenation Characteristics of the Proton Conducting Oxide -Hydrogen Storage Alloy Composite"Mater. Res. Bull.. 37. 1547-1556 (2002)

H.Sakaguchi、K.Hatakeyama、S.Kobayashi、T.Esaka：“质子传导氧化物-储氢合金复合材料的加氢特性”材料。

H. Skaguchi and T. Esaka: "Intermetallic Compounds as Anode Materials for Lithium Secondary Batteries"Hyohmen. 39-6. 21-34 (2001)

H. Skaguchi 和 T. Esaka：“金属间化合物作为锂二次电池的阳极材料”Hyohmen。

坂口裕樹, 江坂享男: "リチウム二次電池用電極材料としての金属間化合物"表面. 39・6. 239-252 (2001)

Hiroki Sakaguchi、Yukio Esaka：“作为锂二次电池电极材料的金属间化合物”Surface 39・6（2001）。