【摘 要】
:
富锂层状正极材料是一种新型的锂离子电池正极材料,因其具有理论容量高(>200mAh/g)、低成本、充放电电压高(>3.5V vs Li/Li+)等优点,已广泛成为人们的研究热点[1-2].Kim等[3]通过共沉淀法合成了0.3Li2MnO3·0.7LiMn1-xNiyCo0.1O2(x=0.3,y=0.2),2.0~4.6 V时放电容量为200 mAh/g;Kang等[4]采用溶胶凝胶法合成了0.
【机 构】
:
上海大学理学院化学系 上海市上大路99号,200444;江苏省新型功能材料重点实验室,江苏,常熟,215500
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富锂层状正极材料是一种新型的锂离子电池正极材料,因其具有理论容量高(>200mAh/g)、低成本、充放电电压高(>3.5V vs Li/Li+)等优点,已广泛成为人们的研究热点[1-2].Kim等[3]通过共沉淀法合成了0.3Li2MnO3·0.7LiMn1-xNiyCo0.1O2(x=0.3,y=0.2),2.0~4.6 V时放电容量为200 mAh/g;Kang等[4]采用溶胶凝胶法合成了0.5Li2MnO3·0.5LiNi0.44Co0.25Mn0.31O2,C/11,0.5C和1C不同倍率充放电时,放电容量分别为250,225,200 mAh·g-1.
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物理掺杂或者包覆是常见的改进锂离子电池正负极材料电化学性能的方法,如利用Ag包覆办法改进尖晶石锰酸锂的电化学性能,利用碳包覆改进磷酸铁锂的高倍率特性,等等.单纯的从改进电极性能的角度看,很多物理掺杂或者包覆方法是很有效的,但是,如果将电极材料置于真正的电池体系中以后,这种物理掺杂或者包覆对隔膜以及对电极的影响就不得不考虑在内了.