【摘 要】
:
The synthesis of Al2O3-coated and uncoated LiMn2O4 by solid-state method and fabrication of LiMn2O4/graphite battery were described.The structure and morphology
【机 构】
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School of Materials Science and Engineering,School of Metallurgical Science and Engineering
【基金项目】
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supported by the Advanced Person Fund of Jiangsu University,China;国家重点基础研究发展规划(973计划)
论文部分内容阅读
The synthesis of Al2O3-coated and uncoated LiMn2O4 by solid-state method and fabrication of LiMn2O4/graphite battery were described.The structure and morphology of the powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM),respectively.The electrochemical and overcharge performances of Al2O3-coated and uncoated LiMn2O4 batteries were investigated and compared.The uncoated LiMn2O4 battery shows capacity loss of 16.5% after 200 cycles,and the coated LiMn2O4 battery only shows 12.5% after 200 cycles.The uncoated LiMn2O4 battery explodes and creates carbon,MnO,and Li2CO3 after 3C/10 V overcharged test,while the coated LiMn2O4 battery passes the test.The steadier structure,polarization of electrode and modified layer are responsible for the safety performance.
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