具有中空分级结构的Na2Li2Ti6O14微球作为高性能锂离子电池负极材料

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Bibliographic Details
Published in	中国科学：材料科学（英文版） Vol. 60; no. 5; pp. 427 - 437
Main Author	范姗姗仲华于海涛娄明谢颖朱彦荣
Format	Journal Article
Language	English
Published	2017
Subjects	中空结构分级结构初级粒子微球溶剂热法合成电化学性能负极材料锂离子电池
Online Access	Get full text
ISSN	2095-8226 2199-4501

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Bibliography:	Relying on a solvent thermal method, spherical Na2Li2Ti6O14 was synthesized. All samples prepared by this method are hollow and hierarchical structures with the size of about 2-3 μtm, which are assembled by many primary nanoparticles （-300nm）. Particle morphology analysis shows that with the increase of temperature, the porosity increases and the hollow structure becomes more obvious. Na2Li2Ti6Ol4 obtained at 800℃ exhibits the best electro- chemical performance among all samples. Charge-discharge results show that Na2Li2Ti6O14 prepared at 800℃ can delivers a reversible capacity of 220.1, 181.7, 161.6, 144.2, 118.1 and 97.2 mA h g-1 at 50, 140, 280, 560, 1400, 2800 mA g-1. How- ever, Na2Li2Ti6O4-bulk only delivers a reversible capacity of 187, 125.3, 108.3, 88.7, 69.2 and 54.8 mA h g-1 at the same current densities. The high electrochemical performances of the as-prepared materials can be attributed to the distinctive hollow and hierarchical spheres, which could effectively reduce the diffusion distance of Li ions, increase the con- tact area between electrodes and electrolyte, and buffer the volume changes during Li ion intercalation/deintercalation processes. Na2Li2Ti6O14, hollow structure, anode material, elec-trochemical performance, lithium ion battery 10-1236/TB Shan-Shan Fan1, Hua Zhong1, Hai-Tao Yu1, Ming Lou1, Ying Xie1. and Yan-Rong Zhu2.
ISSN:	2095-8226 2199-4501