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Journal of Inorganic Materials

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2006 , Vol. 21 >Issue 2: 397 - 402

DOI: https://doi.org/10.3724/SP.J.1077.2006.00397

Research Paper

Characterization and Synthesis Reaction Mechanism of Li1.15-xNi0.33Co0.33Mn0.33O2+δ Cathode for Li-ion Battery

  • TANG Ai-Dong ,
  • HUANG Ke-Long
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  • Institute of Functional Material Chemistry, School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Received date: 2005-03-21

  Revised date: 2005-06-13

  Online published: 2006-03-20

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Abstract

The cathode material for lithium batteries Li1.15-xNi0.33Co0.33Mn0.33O2+δ　with good electrochemical properties was synthesized by the sol-gel method. The synthesis mechanism was examined via X-ray diffraction, X-ray photoelectron spectra, scanning electron microscopy, thermogravimetric analysis and difference thermal analysis and cyclic voltammetry. Li1.15-xNi0.33Co0.33Mn0.33O2+δ　exhibited initial specific discharge capacity of 190mAh/g and tenth of 180mAh/g at 2.5～4.5V by current density of 0.1 mA/cm2. That Li1.15-xNi0.33Co0.33Mn0.33O2+δ　main phase can be obtained as low as 400℃ is attributed to the short distance among lithium, manganese, cobalt and nickel formed in precursor prepared by the citric acid gel process. The crystallinty and layered structure were improved by sintering at high temperature. The solid solution formation could be a three-step process: (1) formation of small particle Li-Ni-Co-Mn-O solid solution main phase at lower temperature; (2) decomposition of residual lithium carbonate; (3) bulk diffusion of lithium oxide from exterior into the bulk of Li-Ni-Co-Mn-O solid solution.

Key words： Li1.15-xNi0.33Co0.33Mn0.33O2+δ; sol-gel method; reaction mechanism

Cite this article

TANG Ai-Dong , HUANG Ke-Long . Characterization and Synthesis Reaction Mechanism of Li1.15-xNi0.33Co0.33Mn0.33O2+δ Cathode for Li-ion Battery[J]. Journal of Inorganic Materials, 2006 , 21(2) : 397 -402 . DOI: 10.3724/SP.J.1077.2006.00397

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