采用低温固相法合成LiNi0.5Mn1.5O4正极材料,考察升温速率对LiNi0.5Mn1.5O4正极材料结构、晶粒尺寸和形貌以及电化学性能的影响.结果表明:升温速率对LiNi0.5Mn1.5O4正极材料的晶粒形貌和电化学性能有重要的影响.当升温速率为10℃/min时,LiNi0.5Mn1.5O4的晶粒尺寸较小,形貌不规则,电化学性能不理想;当提高升温速率到20℃/min时,LiNi0.5Mn1.5O4的晶粒尺寸变大,同时大部分的晶粒形貌变成规则的八面体状,样品不仅容量高而且具有非常优异的倍率性能;当继续提高升温速率到30℃/min时,样品的晶粒尺寸基本不变,但表面出现破碎,破坏了晶粒八面体的完整性,样品的容量和倍率性能降低.因此,在低温固相合成时,升温速率控制是一种调控LiNi0.5Mn1.5O4正极材料晶粒形貌和电化学性能非常简单而有效的方法.
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