Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (3): 717-722.doi: 10.3866/PKU.WHXB201512301

• ARTICLE • Previous Articles     Next Articles

Layered Lithium-Rich Cathode Materials Synthesized by an Ethanol-Based One-Step Oxalate Coprecipitation Method

Jian-Wen KOU1,Zhao WANG1,Li-Ying BAO1,2,*(),Yue-Feng SU1,2,*(),Yu HU1,Lai CHEN1,Shao-Yu XU3,Fen CHEN3,Ren-Jie CHEN1,2,Feng-Chun SUN2,Feng WU1,2   

  1. 1 School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China
    2 Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, P. R. China
    3 China North Vehicle Research Institute, Beijing 100072, P. R. China
  • Received:2015-11-10 Published:2016-03-04
  • Contact: Li-Ying BAO,Yue-Feng SU E-mail:baoliying@bit.edu.cn;suyuefeng@bit.edu.cn
  • Supported by:
    the National Key Basic Research Program of China((973)(2015CB251100));National Natural Science Foundation of China(51472032, 51202083);Program for New Century Excellent Talents in University, China(NCET-13-0044);Special Fund of Beijing CoConstruction Project, China(20150939013);BIT Scientific and Technological Innovation Project, China(2013CX01003)

Abstract:

We synthesized layered lithium-rich cathode materials by a novel ethanol-based one-step oxalate coprecipitation method. Using this method, all the elements including lithium could be coprecipitated during the coprecipitation reaction process to realize a homogeneous mixture of lithium and transition metal elements. In addition, compared with the conventional ammonium oxalate coprecipitation method, the precursor preheating process was eliminated, which should decrease reaction time and cost. X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical measurements were used to investigate the differences in the crystal structure, morphology and electrochemical performance of samples synthesized using the above two methods. Compared with the samples synthesized by the conventional ammonium oxalate coprecipitation method, samples prepared by our novel one-step oxalate coprecipitation method exhibit higher crystallinity with larger interlayer spacing, and smaller, more homogeneous particles. Such crystal structure and morphology endow the samples prepared by the oxalate coprecipitation method with better discharge capacity, cycle performance and rate performance than those synthesized by the conventional method. The simple, efficient coprecipitation method developed here may provide a new approach to fabricate layered materials for highperformance lithium-ion batteries.

Key words: Lithium-ion battery, Cathode material, Li2MnO3, Ethanol, Oxalate coprecipitation method, Electrochemical performance

MSC2000: 

  • O646