摘要
钛酸锂作为锂离子电池负极材料具有结构稳定、长寿命、高安全等优点,在动力及储能领域受到广泛关注。但钛酸锂材料电导率低、导电性差,容易引起电极极化加剧,极大地限制了它在大倍率条件下的应用。针对上述问题,总结了近期国内外钛酸锂负极材料的研究动态,发现采用包覆改性、离子摻杂、复合方法是改善钛酸锂材料电化学性能的研究热点;同时,指出了碳素负极材料存在的缺点与不足,进一步明确了钛酸锂负极材料的优点。但是钛酸锂材料成本远高于碳素材料,不利于大规模普及与推广,在应用领域受到限制,如何继续寻求经济有效的方法,降低钛酸锂材料生产成本,提高钛酸锂材料质量比能量与电化学性能,使其在大规模储能系统、电动汽车、电动工具等领域获得广泛应用,是未来亟需解决的问题。
As an anode material of lithium ion battery,lithium titanate( Li4 Ti5 O12) has the advantages of stable structure,long life and high safety,and it’s getting more and more attentions in the fields of power and energy storage.However,lithium titanate has a low conductivity and poor electroconductibility prone to causing electrode polarization,which greatly limits its applications in charge-discharge at high current densities.Focusing on the above problems,we summarized the recent research trends on anode material of lithium titanate at home and abroad. It is found that the coated modification,ion doping and composite methods are hot spots for researches on improvement of electrochemical performances of lithium titanate material.At the same time,the shortcomings and defects of carbon anode material were pointed out here,further confirming the superiorities of lithium titanate.Nevertheless,the cost of lithium titanate material is much higher than that of carbon material,which is not conducive to large-scale popularization and promotion.How to reduce the cost of lithium titanate material,improve its specific energy and electrochemical properties,and achieve a widespread application in areas such as large scale energy storage systems,electric vehicles and electric tools is thus the problems that urgently need to be solved in the future.
出处
《钢铁钒钛》
CAS
北大核心
2018年第4期11-16,共6页
Iron Steel Vanadium Titanium
关键词
钛酸锂
锂离子电池负极材料
包覆改性
离子摻杂
复合方法
放电容量
lithium titanate
lithium ion battery anode materials
coated modification
ion doping
composite methods
discharge capacity
