Solid solution of nickel oxide and manganese oxide as negative active material for lithium secondary cells
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作者:
Liu, XJ
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Japan Storage Battery Co Ltd, Corp R&D Ctr, Minami Ku, Kyoto 6018520, JapanJapan Storage Battery Co Ltd, Corp R&D Ctr, Minami Ku, Kyoto 6018520, Japan
Liu, XJ
[1
]
Yasuda, H
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Japan Storage Battery Co Ltd, Corp R&D Ctr, Minami Ku, Kyoto 6018520, JapanJapan Storage Battery Co Ltd, Corp R&D Ctr, Minami Ku, Kyoto 6018520, Japan
Yasuda, H
[1
]
Yamachi, M
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Japan Storage Battery Co Ltd, Corp R&D Ctr, Minami Ku, Kyoto 6018520, JapanJapan Storage Battery Co Ltd, Corp R&D Ctr, Minami Ku, Kyoto 6018520, Japan
Yamachi, M
[1
]
机构:
[1] Japan Storage Battery Co Ltd, Corp R&D Ctr, Minami Ku, Kyoto 6018520, Japan
The solid solution of nickel oxide and manganese oxide has been synthesized successfully by heating Ni1-aMnaOOH at a temperature ranging from 350 to 1000 degrees C in oxygen atmosphere, and investigated as a high-capacity negative active material for lithium secondary cells. The discharge capacity of nickel and manganese oxide solid solution was decreased with increasing heat-treatment temperature. The average discharge potential shifts toward negative as increasing Mn content in the solid solution. Meanwhile, large amount of Mn in the oxide solid solution caused a poor cycleability. The Ni0.75Mn0.25O1.36 obtained by heating its raw material at 600 degrees C delivered a large discharge capacity over 700 mAhg(-1) with a relatively low average discharge potential of 1.69 versus Li/Li+. In addition, the Ni0.75Mn0.25O1.36 gave the best capacity retention of 91% with representative charge-discharge curves even after 22 cycles. According to the results of XRD and high-resolution X-ray fluorescence spectrometer (HRXRF) measurements for the oxide solid solution before and after the first charge, it was clear that an amorphous-like or nano-sized phase was formed during the first electrochemical reduction; all of the nickel and a part of manganese were reduced to metallic state after charge to 0.2 V versus Li/Li+. (c) 2005 Elsevier B.V. All rights reserved.