| Project/Area Number |
22550169
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Functional materials/Devices
|
|---|
| Research Institution | National Institute for Materials Science |
|---|
Principal Investigator |
OZAWA Kiyoshi 独立行政法人物質・材料研究機構, 電池材料ユニット, 主席研究員 (90343855)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
MOCHIKU Takashi 物質・材料研究機構, 超伝導物性ユニット, 主幹研究員 (20354293)
FUJII Hiroki 物質・材料研究機構, 超伝導線材ユニット, 主幹研究員 (80354306)
|
|---|
| Project Period (FY) |
2010-10-20 – 2013-03-31
|
| Project Status |
Completed (Fiscal Year 2013)
|
| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
|
|---|
| Keywords | リチウムイオン電池 / コンポジット正極材 / 固溶体化合物 |
|---|
| Research Abstract |
We investigated the battery properties and structures of composite cathode materials of Li2MnO2-LiCoO2 systems for lithium-ion batteries. The electrochemical capacities can be controlled between 150 – 300 mAhg-1 by regulating the Co contents. The XRD, TEM, and neutron diffraction data showed that the structures also depend on the Co contents; composites with a low Co content are a monoclinic structure with the space group symmetry of C2/m, whereas composites with a high Co content are a rhombohedral one of R-3m. For the samples after charge-discharge cycles, not only disordering Li and Mn atoms but also coexistence of C2/m and Fd-3m phases. Furthermore, for the samples with a high Co content, the phase of R-3m is also observed. These behaviors are related to the cycle numbers and upper voltage for the charge processes.
|
