| Presentation | 2008-05-09 Electrochemical Properties of Thin-Film Lithium Secondary Batteries Using Positive LiCoO_2 Films Prepared by ECR Sputtering Method Masahiko HAYASHI, Masaya TAKAHASHI, Takahisa SHODAI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Well-crystallized positive LiCoO_2 films for thin-film lithium secondary batteries were obtained without a post-annealing process by employing an electron cyclotron resonance (ECR) plasma sputtering method as a novel deposition technique. The thin-film batteries were fabricated by depositing a LiPON electrolyte film and a negative Li film in sequence on the positive LiCoO_2 film. The batteries exhibited large energy densities of about 1 mWh/cm^2 and good charge/discharge cycle performance. The utilization of the positive film, which was estimated from the discharge capacities of the batteries, was about 60 %, and consequently the film was found to contain a large amount of inactive Co_3O_4 impurity phase. The positive film was prepared by using a Li-excess Li_<2.0>CoO_2 (a mixture of LiCoO_2 and Li_2CO_3) target to increase the utilization of the positive film. The films thus obtained were stoichiometric LiCoO_2 phase films that exhibited a utilization of almost 100%. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Thin-film lithium secondary batteries / lithium cobaltite (LiCoO_2) / electron cyclotron resonance (ECR) plasma sputtering method / high energy density |
| Paper # | EE2008-1 |
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| Conference Information | |
| Committee | EE |
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| Conference Date | 2008/5/2(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Energy Engineering in Electronics and Communications (EE) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Electrochemical Properties of Thin-Film Lithium Secondary Batteries Using Positive LiCoO_2 Films Prepared by ECR Sputtering Method |
| Sub Title (in English) | |
| Keyword(1) | Thin-film lithium secondary batteries |
| Keyword(2) | lithium cobaltite (LiCoO_2) |
| Keyword(3) | electron cyclotron resonance (ECR) plasma sputtering method |
| Keyword(4) | high energy density |
| 1st Author's Name | Masahiko HAYASHI |
| 1st Author's Affiliation | NTT Energy and Environment Systems Laboratories, Nippon Telegraph and Telephone Corporation() |
| 2nd Author's Name | Masaya TAKAHASHI |
| 2nd Author's Affiliation | NTT Energy and Environment Systems Laboratories, Nippon Telegraph and Telephone Corporation |
| 3rd Author's Name | Takahisa SHODAI |
| 3rd Author's Affiliation | NTT Energy and Environment Systems Laboratories, Nippon Telegraph and Telephone Corporation |
| Date | 2008-05-09 |
| Paper # | EE2008-1 |
| Volume (vol) | vol.108 |
| Number (no) | 25 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |