【作者】 吴奎辰； 肖伶俐； 徐中领； 胡素娟； 高青雨； 施南峰； 吴清国；

【Author】 Wu Kuicheng~(1,2),Xiao Lingli~(2*),Xu Zhongling~2,Hu Sujuan~2,Gao Qingyu~1,Shi Nanfeng~2,Wu Qingguo~(2,3) 2 College of Chemistry and Chemical Engineering,Henan University,Kaifeng,Henan 475004,P.R.China 1 Zhejiang WELLY Energy Corporation,48 Xingyuan Rd,Cixi,Zhejiang 315301,P.R.China 3 Ningbo Institute of.Materials Technology and Engineering,Chinese Academy of Sciences,519 Zhuangshi Rd, Ningbo,Zhejiang 315211,P.R.China

【机构】 河南大学化学化工学院； 浙江瓦力新能源科技有限公司； 中国科学院宁波材料技术与工程研究所；

【摘要】 本文研究了金属离子双掺杂协同效应对尖晶石锰酸锂性能的影响。主要考察了Al、Mg、Co、Ti中的一种或两种掺杂元素对尖晶石锰酸锂晶粒结构、粒度分布、颗粒形貌等的影响。XRD研究表明,通过双掺杂元素改性的锰酸锂具有典型的尖晶石锰酸锂特征峰,且无杂峰。SEM、XRD、PSD、BET等的测试结果显示由Al、Co双掺杂得到的产物具有完整的锰酸锂尖晶石结构,结晶良好,晶粒大小约5μm左右,形貌规整,且具有较好的分散性,D50为17μm左右,比表面积为0.4m~2/g左右,从而改善了尖晶石锰酸锂的物理性能;电化学检测结果表明,Al、Co双掺杂得到的产物首次充放电效率达到93.6%,同时具有更好的循环性能。更多还原

【Abstract】 The cooperative effects of cation doping on the properties of LiMn₂O₄ spinel was studied,by investigating the influence of single/co-doping of Al,Mg,Co,Ti on crystal structure,particle size distribution and morphology of LiMn₂O₄,spinel,The doped samples were examined by SEM,XRD,PSD,and BET,and the results show that the properties of LiMn₂O₄ can be modified by the strategy of doping.It was found that AI/Co co-doped LiMn₂O₄ has an improved physical properties with pure cubic spinel structure without impurity,good crystallinity, nice dispersion,regular and ideal morphology with primary particle size of about 5μm,D50 of about 17μm and specific surface area of about 0.4m²/g.Electrochemical tests showed that the Al/Co co-doped LiMn₂O₄ has an improved cycling performance with a high initial coulombic efficiency of 93.6%.更多还原