J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (8): 763-767.DOI: 10.1016/j.jmst.2017.01.019

• Orginal Article •     Next Articles

Carboxymethyl chitosan/poly(ethylene oxide) water soluble binder: Challenging application for 5 V LiNi0.5Mn1.5O4 cathode

Zhong Haoxianga, Lu Jidianb, He Aiqinb, Sun Minghaoac, He Jiarongac, Zhang Lingzhia()   

  1. a Key Laboratory of Renewable Energy, Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou Institute ofEnergy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    b Guangzhou Lithium Force Energy Technology Co., Ltd, Guangzhou 510730, China
    c University of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2016-08-17 Accepted:2017-01-03 Online:2017-08-20 Published:2017-10-31

Abstract:

Carboxymethyl chitosan/poly (ethylene oxide) (CCTS/PEO) composite is firstly reported as a water soluble binder for the application of 5 V LiNi0.5Mn1.5O4 cathode in Li-ion batteries. Both CCTS and PEO show a high electrochemical oxidation potential of above 5.0 V (vs. Li/Li+). The electrochemical performances of LiNi0.5Mn1.5O4 (LNMO) cathodes with CCTS/PEO composite binders of different mass rates are investigated, it is found that LiNi0.5Mn1.5O4 cathode with an optimized CCTS/PEO (85/15, w/w) composite exhibits a slightly better cycling performance than that of polyvinylidene fluoride (PVDF), retaining 81.4% capacity as compared with 79.8% for PVDF at 0.5C rate after 200 cycles. LNMO with PEO/CCTS (85/15, w/w) exhibited the better rate capability than that of PVDF. These results demonstrate that CCTS/PEO composite can be potentially used as a water-soluble binder for 5 V LNMO cathode.

Key words: Carboxymethyl chitosan, Poly (ethylene oxide), Water soluble binder, LiNi0.5Mn1.5O4, Lithium ion battery