DIRECT CONTACT SHIELD OFLiMn2O4ACTIVE MATERIAL FROM ELECTROLYTE

Myoung Hye Chang and Chang Woo Lee ()
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Myoung Hye Chang: Department of Chemical Engineering, Green Energy Center, Kyung Hee University, 1 Seochun, Gihung, Yongin, Gyeonggi 446-701, Korea
Chang Woo Lee: Department of Chemical Engineering, Green Energy Center, Kyung Hee University, 1 Seochun, Gihung, Yongin, Gyeonggi 446-701, Korea

Surface Review and Letters (SRL), 2010, vol. 17, issue 01, 81-86

Abstract: The spinelLiMn2O4powders were prepared by sol–gel technique using lithium acetate(Li(CH3COO) · 2H2O)and manganese acetate(Mn(CH3COO)2· 4H2O)as starting materials, citric acid as a chelating agent, and acrylamide as a gel formatting agent. In order to improve the electrochemical performance of lithium ion batteries and prevent structural disintegration from Mn dissolution generated by undesirable acid production, conductive agents were additionally coated on the surface of active material coated on pure aluminum foil as a current collector. Also, it was comparatively investigated using different conductive agents with different particle sizes as well as adopting the cells into the different thermal environments. The electrochemical performance of theLi/LiMn2O4cells demonstrated that the spinelLiMn2O4might be effectively shielded from acid, resulting in improved electrochemical capacity characteristics at room temperature as well as elevated temperature of 55°C.

Keywords: Lithium ion battery; cathode; LiMn2O4; Mndissolution (search for similar items in EconPapers)
Date: 2010
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DOI: 10.1142/S0218625X10013862

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