Studies of capacity losses in cycles and storages for a Li1.1Mn1.9O4 positive electrode

Motoharu Saitoh, Mitsuru Sano, Miho Fujita, Makoto Sakata, Masaki Takata, Eiji Nishibori

研究成果: Article査読

54 被引用数 (Scopus)


A spinel-type of lithium-rich lithium manganese oxide, Li1.1Mn1.9O4, was prepared and studied electrochemically and structurally as a positive electrode of a Li-ion battery. In cycle performance tests, capacity losses were 3 and 11 mAh/g after 75 cycles at 25 and 55°C, respectively, corresponding to 15 and 50 mAh/g for a normal lithium manganese oxide, LiMn2O4. Their losses were divided into two parts; one resulting from the deterioration of the active material itself and the other due to the poor conduction of the active material to the collector. The former and latter contributions to the losses at 55°C were 2 and 9 mAh/g, respectively for the Li-rich spinel, and 18 and 32 mAh/g, respectively for the normal spinel. The capacity loss by the poor conduction was apparently much larger for both spinels of positive electrodes. Cycle performance tests in each region of the charge states divided into five regions show that relatively larger capacity losses were observed in lower potential states. However, in every region, a capacity loss for the Li-rich spinel was much smaller than that of the normal spinel. There was a close relation found between capacity losses in the storage and those in the cycle. Electron densities spreading between manganese and oxygen atoms were larger in the Li-rich than in the normal spinels. Thus, it turned out that the structure of the Li-rich spinel was made more stable because of strong Mn-O bonds.

ジャーナルJournal of the Electrochemical Society
出版ステータスPublished - 2004 2月 16

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学


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