Reduction of Internal Resistance in High Capacity Lithium-ion Batteries with 3D Lattice-structured Electrode
三次元網目構造電極を適用した高容量リチウムイオン電池の内部抵抗低減
- Delivery
- Available on the other site
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- Paper/Info type
- Honda R&D Technical Review
Vol.33 No.1
- Pages
- 66-77(Total 12 p)
- Date of publication
- Mar 2021
- Publisher
- Others, Unknown
- Language
- Japanese
Detailed Information
| Category(J) | 論文 Translation |
|---|---|
| Category(E) | Technical Papers and Explanation |
| Author(J) | 1) 田名網 潔, 2) 田中 俊充, 3) 磯谷 祐二, 4) 青柳 真太郎, 5) 細江 晃久, 6) 竹林 浩, 7) 奥野 一樹, 8) 山本 琢磨 |
| Author(E) | 1) Kiyoshi TANAAMI, 2) Toshimitsu TANAKA, 3) Yuji ISOGAI, 4) Shintaro AOYAGI, 5) Akihisa HOSOE, 6) Hiroshi TAKEBAYASHI, 7) Kazuki OKUNO, 8) Takuma YAMAMOTO |
| Affiliation(J) | 1) 本田技術研究所, 2) 本田技術研究所, 3) 本田技術研究所, 4) 本田技術研究所, 5) 住友電気工業, 6) 住友電気工業, 7) 住友電気工業, 8) 住友電気工業 |
| Affiliation(E) | 1) Honda R&D , 2) Honda R&D , 3) Honda R&D , 4) Honda R&D , 5) Sumitomo Electric Industries, 6) Sumitomo Electric Industries, 7) Sumitomo Electric Industries, 8) Sumitomo Electric Industries |
| Abstract(J) | リチウムイオン電池のエネルギー密度の向上を目的に，金属の三次元網目構造体を集電体に適用し，正極の改善検討を小型セルで，体積エネルギー密度の向上の実証を積層セルでおこなった． 小型セルでは，正極の二つの課題に対し対応策を実施し，その効果の確認と要因を整理した．一つ目の課題は，集電体と活物質の間の接触性の向上であり，集電体表面を導電性カーボンで被覆することで対応した．二つ目の課題は，活物質間の電子伝導パスの形成の向上であり，微粒導電助剤を分散液で適用することで対応した．その結果，いずれの課題対応策においても，抵抗抑制と耐久性向上の効果を確認することができた．また，その要因を把握するために，SPM測定による活物質の導電性評価を実施した結果，電子伝導パスの断裂を抑制しているためであることを確認した． 積層セルでは，電極の厚膜化により，その積層数を削減できた結果，セルエレメントの体積エネルギー密度が集電箔電極セルの614 Wh/Lから，三次元網目構造電極セルにより674 Wh/Lと9.8%の向上を確認した． Translation |
| Abstract(E) | After applying a 3D metal lattice structure to the current collectors, enhancements to the cathode were examined in small cells, and an increase in volumetric energy density was demonstrated in laminated cells, with the goal of increasing the energy density of lithium-ion batteries. Countermeasures were implemented to address two issues with the cathodes of small cells. The efficacy of these measures was confirmed, and the causal factors were cataloged. The first issue is enhancing the contact between the collectors and the active materials. This was addressed by coating the surface of the collectors with conductive carbon. The second issue is enhancing the creation of electron-conductive paths. This was addressed by applying a fine particle conductive agent in the form of a liquid dispersant. The results confirmed that each of these countermeasures had the effect of suppressing resistance and enhancing durability. Moreover, to ascertain the primary cause of these effects, the conductivity of the active material was evaluated using scanning probe microscopy (SPM). The results showed that it is because the countermeasures are suppressing the interruption of electron-conductive paths. Increasing the thickness of the electrodes in laminated cells reduced the number of electrode layers, and resulted in a 9.8% increase in energy density of cell elements for a cell using 3D lattice-structured electrodes (674 Wh/L), compared with a cell using foil-coated electrodes (614 Wh/L). |
