| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Evolutions of Crystal Structure, Stoichiometry and Electrochemical Behavior with Co Substitution in LiNi1-yCoyO2 Positive Electrodes |
XIA Rong-Sen, CUI Zhong-Hui, LIU Bi-Qiu, GUO Xiang-Xin, ZHAO Jing-Tai |
| Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 |
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| Cite this article: |
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XIA Rong-Sen, CUI Zhong-Hui, LIU Bi-Qiu et al 2010 Chin. Phys. Lett. 27 076102 |
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Abstract LiNi1-yCoyO2(0.1≤ y≤0.4) positive electrode materials are synthesized by a chemical method with stoichiometric acetates of related cations. Their crystal structure, stoichiometry and electrochemical behaviors versus Co concentration are investigated by x-ray diffraction, synchrotron-based x-ray absorption fine structure and galvanostatic cycling measurements. The results reveal that the non-stoichiometric Ni2+, Li/Ni cation mixing and polarization are reduced as the amount of Co substitution increases, clearly indicating that the Co element is a medium for easily oxidizing Ni2+ to Ni3+ during the synthesis process.
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| Keywords:
61.05.Cj
61.05.Cp
82.47.Aa
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Received: 15 April 2010
Published: 28 June 2010
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| PACS: |
61.05.cj
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(X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.)
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61.05.cp
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(X-ray diffraction)
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82.47.Aa
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(Lithium-ion batteries)
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