成果報告書詳細
管理番号20110000001409
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 5
公開日2012/6/27
報告書年度2010 - 2010
委託先名独立行政法人産業技術総合研究所、日立マクセル株式会社、パナソニック株式会社、株式会社本田技術研究所
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 本共同研究は、本事業の研究開発項目3「材料革新」について、当該研究開発項目担当の4 法人が、リチウムイオン電池のエネルギー密度の向上並びに高耐久化・高度信頼性の同時達成のための電池材料の革新に資する指針の提案を目指すものである。なお、材料革新の指針の導出に当たっては、本事業の研究開発項目1 「高度解析技術開発」において開発される高輝度X 線等の量子ビーム技術や核スピン等をプローブに用いた高分解能測定手法を積極的に適用するとともに、研究開発項目2 「電池反応解析」におけるリチウムイオン電池の反応過程とその速度論的把握のために開発される解析技術及び得られた成果を利用して、統合的に研究を推進する。
英文要約Title: Research and Development for Innovation of Materials for Lithium-ion and Lithium Batteries / Research and Development Initiative for Scientific Innovation of New Generation Batteries (RISING) (FY2009?FY2011)FY2010 Annual Report
The present study has been done in collaboration with AIST, Hitachi Maxell, Honda R&D Co., and Panasonic. The goal of this study is to indicate concepts for innovatively improving methods for positive and negative electrode materials in order to achieve breakthroughs of lithium-ion cell performance, durability and reliability. This study focused on the following subjects; (i) formation of highly durable interface between positive electrodes and electrolytes, (ii) high voltage positive electrodes and (iii) high capacity negative electrodes possessing longer cycle and storage life. In this fiscal year, 2010, we have studied various surface-coating processes for positive electrodes to achieve highly durable positive electrodes; we examined effects of surface-coating methods on surface and bulk of positive electrodes. In addition, electrode reaction and degradation mechanisms of high voltage positive electrodes and high capacity negative alloy electrodes have been investigated.
i) Formation of highly durable interface between positive electrodes and electrolytes:
As a dry process, mechanochemical coating of Al2O3 on LiNi1/3Mn1/3Co1/3O2 was investigated. After checking the upper threshold energy of mechanochemical coating which does not change morphology and chemical states of surface of the positive electrode, Al2O3-coated LiNi1/3Mn1/3Co1/3O2 materials were prepared. While rate capability of LiNi1/3Mn1/3Co1/3O2 decreased with increase of Al2O3 coating concentration, LiNi1/3Mn1/3Co1/3O2 partially coated with Al2O3 also showed clear improvements of capacity and rate retention. As a wet process, we have also developed a new solvent system to achieve more homogeneous coating of Al2O3 on LiNi1/3Mn1/3Co1/3O2. In next fiscal year, we will concentrate to clarify the reason why partially coating of Al2O3 also has an effect on degradation rate in collaboration with the advanced analytical method group.
ii) High voltage positive electrode materials:
In order to improve durability of LiNi0.5Mn1.5O4, we prepared LiNi0.5Mn1.5O4 coated with Al2O3 by the mechanochemical process. Since rate capability and reversible capacity of LiNi0.5Mn1.5O4 also decreased with increase of Al2O3 coating concentration, we will examine optimum Al2O3 coating concentration which improves durability of the positive electrode with minimum decrease of rate capability and reversible capacity.
iii) High capacity negative electrode materials:
In general, high capacity negative alloy electrodes show large volume change during lithium insertion and extraction. In order to avoid cracking of alloy electrodes, we tried to prepare alloy electrodes with micro porous structure by a self-assembly process, and it has been found that this micro-porous structure significantly improves capacity retention during charge-discharge cycle. Phase change of this lithium-alloy system during lithium insertion and extraction has been examined by XRD and s-TEM/EELS analysis, we have succeeded to obtain distribution of not only alloy metal but also lithium along cross section of the alloy electrode by using s-TEM/EELS analysis. Phase diagram of this lithium-alloy system during charge and discharge will be clarified to improve cycle efficiency and life.
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