摘要
高镍正极材料因其高比容量等优点在多个领域得到广泛应用,然而材料的结构稳定性是其亟需解决的一个技术难题。目前,元素体相掺杂或表面包覆技术是提升材料稳定性最常用的技术手段。通过系统综述Al、Zr、Ti、B、Mg、P、F、Ce等掺杂包覆元素对高镍材料循环寿命的提升情况,进一步剖析了这些元素提升材料微观结构稳定性的作用机理,包括抑制锂镍混排度、增强本征机械结构稳定性、减缓相结构变化、降低过渡金属溶出及提高锂离子传质系数等。这些元素提升材料结构稳定性的作用效果及作用机理对于开发其它新型掺杂包覆元素具有一定的指导意义。
Ni-rich cathode materials have been widely used in many fields for their high specific capacity.However,the structure stability of materials is a technical problem that needs to be solved urgently.The element bulk doping or surface coating is the main method to improve the cycling stability.The effects of the coating and doping elements including Al,Zr,Ti,B,Mg,P,F,and Ce on improving cycling life of Ni-rich cathode materials were reviewed.The mechanisms of these elements to enhance the structure stability were analyzed,including the inhibition of Li/Ni2+cation mixing,enhancement of the mechanical structure stability,retardation of the phase structure transition,reduction of the transition metal ions dissolution and improvement of the lithium ion mass transfer coefficient.The effects and mechanisms of these elements to improve the structure stability can provide some directions for the development of other novel doping and coating elements.
作者
王念举
马洪运
郭隆泉
周江
WANG Nian-ju;MA Hong-yun;GUO Long-quan;ZHOU Jiang(Tianjin Lishen Battery Joint-Stock Co.,Ltd.,Tianjin 300384,China)
出处
《电源技术》
CAS
北大核心
2021年第1期127-131,共5页
Chinese Journal of Power Sources
基金
国家重点研发计划项目(SQ2016ZY02003471)。
关键词
高镍正极材料
掺杂元素
包覆元素
结构稳定性
Ni-rich cathode materials
doping element
coating element
structure stability
