成果報告書詳細
管理番号20110000001387
タイトル*平成22年度中間年報 革新型蓄電池先端科学基礎研究事業 革新型蓄電池先端科学基礎研究開発 4
公開日2012/6/27
報告書年度2010 - 2010
委託先名国立大学法人京都大学、三洋電機株式会社、株式会社 ジーエス・ユアサコーポレーション、新神戸電機株式会社、トヨタ自動車株式会社、株式会社豊田中央研究所、日産自動車株式会社、パナソニック株式会社、株式会社日立製作所、株式会社本田技術研究所、三菱自動車工業株式会社、三菱重工業株式会社
プロジェクト番号P09012
部署名スマートコミュニティ部
和文要約和文要約等以下本編抜粋:1.共同研究の内容及び成果等 京都大学を拠点として産官学の英知を結集してリチウムイオン電池の革新のために「現象解析の新技術」に取り組んできた。京都大学と参画法人からの研究員とが共同で京都大学に研究環境を整備し、「高度解析技術開発」、「電池反応解析」、「革新電池」のそれぞれの研究を推進した。
1 高度解析技術開発 現在の代表的なリチウムイオン電池の反応は、通常、数百nm?数十μmの活物質粒子バルクへのリチウムイオンの挿入・脱離反応によって進行する。活物質粒子は数百nm以下の一次粒子によって構成されているが、反応の開始は、活物質(電極)/電解質界面で行われる。また巨視的な観点で見ると、電極は、活物質粒子、導電材(カーボン微粒子)、結着材、電解質の複雑な三次元構造からなる合剤電極であり、電子導電パスとイオン導電パスが両立できるように構成されている。しかしながら、これらの複雑な階層構造が、リチウムイオンの挿入・脱離反応という一見単純な反応を複雑化しており、界面反応に加え、相関イオン移動、固相内イオン拡散、さらには合剤電極内の反応分布などが電池の性能、寿命劣化、不安全性に影響を与えている。
英文要約 To realize high energy batteries for future electric vehicles, it has been studied as “R&D Initiative for Scientific Innovation on New Generation Batteries”, so called “RISING” Project.
Lithium ion batteries are widely used for consumer applications however there are many problems to be solved to install electric vehicle applications. In this project, the research area is focused on (i) Advanced Analysis Research to develop high level analytical method, (ii) Battery Reaction Research to elucidate of reactions for lithium ion batteries, (iii) Innovative Battery Research to develop post lithium ion batteries.
With the view to develop Advanced Analysis Research, several high energy radiation methods have been studied to analyze the interfacial structure of active materials under cell reactions. The advanced methods are synchrotron X-ray beam, neutron beam, nuclear magnetic resonances as well as theoretical analysis.
XAFS method has been studied to observe the surface structure and its change of cathode materials by SPring-8 synchrotron. A novel depth-resolved XAFS method to observe the chemical state and local structure at interface between cathode material and electrolyte having around 5nm depth resolution have been developed. New beam line has been installed into Spring-8 as to develop high resolution analysis for the interfacial reactions under cell reactions.
The other method for analysis is neutron diffraction analysis. To obtain higher resolution under cell reactions, new beam line has been designed and installed into J-PARC neutron beam facilities. By using both synchrotron beam and neutron beam analysis, it can be studied whole of cell reactions with wide range of elements from light to heavy elements.
NMR analysis also has been studied for active materials and ion transfer during reactions. Solid-state magnetic-angle spinning NMR for microscopic local structure of cathode materials has been studied.
Considering theoretical approach, it has been studied a systematic calculation of theoretical absorption spectra by the first-principles method based on density functional theory for polymorphs and charged states of cathode materials of lithium-ion batteries. The effects of the electronic states and local structures on the absorption spectra were studied.
In case of Battery Reaction Research, interfacial reaction mechanism between active materials and electrolyte for lithium ion cells has been studied to identify reactions by several analytical methods such as EIS, Raman spectroscopy and other analytical methods. Solved metal cation from cathode material affects SEI formation on the surface of anode active material.
As to develop future post lithium ion cells, Innovative Battery Research has been studied for several chemical systems. One of the approaches is zinc-air cells. It seems that zinc deposition can be controlled without severe dendrite deposition.
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