Acta Phys. -Chim. Sin. ›› 2017, Vol. 33 ›› Issue (6): 1189-1196.doi: 10.3866/PKU.WHXB201702221

• ARTICLE • Previous Articles     Next Articles

The Effects of Surfactants on Al2O3-Modified Li-rich Layered Metal Oxide Cathode Materials for Advanced Li-ion Batteries

Yong-Ping GAN,Pei-Pei LIN,Hui HUANG,Yang XIA,Chu LIANG,Jun ZHANG,Yi-Shun WANG,Jian-Feng HAN,Cai-Hong ZHOU,Wen-Kui ZHANG*()   

  • Received:2016-12-02 Published:2017-05-19
  • Contact: Wen-Kui ZHANG E-mail:echem@zjut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21403196);the National Natural Science Foundation of China(51572240);the National Natural Science Foundation of China(51677170);Natural Science Foundation of Zhejiang Province, China(LY15B030003);Natural Science Foundation of Zhejiang Province, China(LY16E070004);Natural Science Foundation of Zhejiang Province, China(LY17E020010);Ford University Research Program, China

Abstract:

In this work, a series of Li-rich layered metal oxides (LLMO) as cathode materials for lithium ion batteries were prepared by the coprecipitation method. Various surfactants were introduced into the preparation of Al2O3-modified LLMO. The roles of surfactants were systematically investigated to reveal the mechanism of Al2O3 modification. The microstructure, morphology and electrochemical performance of the as-prepared samples were studied by the X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), galvanostatic discharge/charge measurement, cycling stability, rate capability and electrochemical impedance spectroscopies. The experimental results showed that Al2O3 nanoparticles were uniformly dispersed on the surface of LLMO by using N, N, N-trimethyl-1-dodecanaminium bromide (DTAB) as the surfactant. Al2O3-modified LLMO used DTAB as surfactant delivered the initial discharge capacity of 186 mAh·g-1 at the current density of 600 mA·g-1. After 500 cycles, the reversible discharge capacity was 132 mAh·g-1 with a satisfactory capacity retention of 71%. Moreover, the voltage fade of LLMO was greatly suppressed after Al2O3 modification, which exhibited superior electrochemical performances.

Key words: Surfactant, Lithium-ion battery, Cathode material, Aluminum oxide, Li-rich layered metal oxide

MSC2000: 

  • O646