Spinel lithium titanate (Li4Ti5O12) as novel anode material for room-temperature sodium-ion battery

This is the first time that a novel anode material, spinel Li₄Ti₅O₁₂ which is well known as a “zero-strain” anode material for lithium storage, has been introduced for sodium-ion battery. The Li₄Ti₅O₁₂ shows an average Na storage voltage of about 1.0 V and a reversible capacity of about 145 mAh/g, thereby making it a promising anode for sodium-ion battery. E_x-situ X-ray diffraction (XRD) is used to investigate the structure change in the Na insertion/deinsertion process. Based on this, a possible Na storage mechanism is proposed.     

室温钠离子储能电池电极材料结构研究进展

随着风能和太阳能等新能源的大规模发展及未来智能电网的实现,大规模储能系统显得越来越重要.室温钠离子电池以较低的成本再次引起了研究者的兴趣,并成为一种有前途、低成本的储能体系.目前,已提出多种材料可作为钠离子电池的电极材料.一般而言,材料的性质主要由材料的晶体结构决定,本文主要介绍目前提出的多种可行室温钠离子电池电极材料的晶体结构,希望通过总结已有电极材料的晶体结构,对新材料的设计提供指导.     

Significant effect of electron transfer between current collector and active material on high rate performance of Li4Ti5O12

The rate and cycling performances of the electrode materials are affected by many factors in a practical complicated electrode process. Learning about the limiting step in a practical electrochemical reaction is very important to effectively improve the electrochemical performances of the electrode materials. Li₄Ti₅O₁₂, as a zero-strain material, has been considered as a promising anode material for long life Li-ion batteries. In this study, our results show that the Li₄Ti₅O₁₂ pasted on Cu or graphite felt current collector exhibits unexpectedly higher rate performance than on Al current collector. For Li₄Ti₅O₁₂, the electron transfer between current collector and active material is the critical factor that affects its rate and cycling performances.