| Project/Area Number |
17550167
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Functional materials/Devices
|
|---|
| Research Institution | TOTTORI UNIVERSITY |
|---|
Principal Investigator |
HIRAI Sakaguchi Tottori Univ., Faculty of Engineering, Professsor, 工学部, 教授 (00202086)
|
|---|
| Project Period (FY) |
2005 – 2006
|
| Project Status |
Completed (Fiscal Year 2006)
|
| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2006: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
|
|---|
| Keywords | Lithium storage alloys / Lithium secondary batteries / Anode materials / Gas-deposition method / Mg_2Ge |
|---|
| Research Abstract |
Lithium storage alloys have been extensively investigated because of an increasing demand on higher capacity anodes for next generation's rechargeable lithium batteries. We have been focused on Mg_2Ge due to its latent capacity more than graphite and the electrode reaction mechanism based on a formation of lithium solid solution. The material, however, exhibited a poor cyclability as well as other alloy electrodes. To solve the problem, we prepared the Mg_2Ge thick film electrode by using a gas-deposition (GD) method ; where the high adhesion can be expected between the film and the substrate, and its electrode performance was investigated.
From the charge-discharge (Li insertion-extraction) curve of Mg_2Ge GD-film electrode and the conventional bulk electrode at the first cycle. The increase in both charge and discharge capacities was observed on the GD-film electrode, suggesting the improvement of adhesion between Mg_2Ge layer and Cu foil. As for the variation in capacity retention with the charge-discharge cycling, the cyclability of GD-film electrode was obviously superior to that of the bulk electrode. The discharge capacity of the film electrode maintained 35 % of the initial capacity even at 200th cycle. It is noteworthy that the GD-film electrode was able to operate at very large current densities, indicating the creation of batteries having larger power density.
|
