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米村 雅雄*; 神山 崇*; 石垣 徹; 森 一広*; Harjo, S.; 岩瀬 謙二*; 竹内 要二*; 佐々木 厳*; 右京 良雄*
no journal, ,
LiMO(M=Ni,Co, etc.)のような積層岩塩型構造材料は再充電可能なリチウムイオン電池の陽極として有望な候補材料である。しかしながら、これらの材料は、構造や熱特性が不安定なため、リチウムのインターカレーション又はその逆のプロセス中に電気化学的な性質が劣化する。一方、Mg添加系のLi(M,Mg)Oのように、LiMOの中のMに別の元素を添加することによって良いインターカレーションサイクル安定性を示す。本研究では、Li(Ni,Co,Al,Mg)O系材料にMgを0Mg0.1添加し、それに伴う構造変化を中性子回折を用いて詳細に調べた。
三間 圀興*; 東 博純*; 山崎 明義; 神谷 富裕; 奥田 匠昭*; 右京 良雄*; 加藤 義章*; Gonzales, R.*; Soldo, F.*; Perlado, J. M.*; et al.
no journal, ,
The micro-meter scale distribution of Li in a positive electrode of a Li-ion battery contains LiNiCoAlMgO (x = 1.050.5) micro particles was imaged by micro-PIGE (Particle-Induced Gamma Ray Emission) technique with the beam diameter of 11.5 m at Takasaki Ion Accelerators for Advanced Radiation Application facility. In the experiments, measurements were made on the cross section of a positive electrode which was disassembled from the Li-ion battery after rapid charging. As a result, we found that the Li concentration distribution is non-uniform along the depth direction as is expected from the Li diffusion velocity and the charging speed of the sample. This results show that the IBMA is a powerful tool for the diagnostics of the Li-ion batteries and also for that of other battery structures under various charge and discharge conditions. Those data are expected to be useful for the R&D of the advanced batteries.