Chitosan oligosaccharides: A novel and efficient water soluble binder for lithium zinc titanate anode in lithium-ion batteries
By Haoqing Tang and Qiang Weng and Zhiyuan Tang
Published in Electrochimica Acta
2015
Abstract
Chitosan oligosaccharides (COS) as a new, environmentally and water-based organic compound, is firstly applied as the electrode binder for Li2ZnTi3O8 electrode in lithium-ion batteries. Compared with conventional polyvinylidene fluoride (PVDF) binder, the \COS\ binder is used for Li2ZnTi3O8 electrode significantly improves the electrochemical performances in terms of the first Columbic efficiency, cycling behavior, rate capability and long life cycle. At 0.1 A g?1, the initial discharge capacity of 215.6 mAh g?1 can be obtained for Li2ZnTi3O8 with \COS\ binder system and the Columbic efficiency is as high as 93.6%, which are apparently better than \PVDF\ binder system. Moreover, 66.1 mAh g?1 can be remained after 1000 cycles and the retention is 33.6% for \COS\ binder system, while the \PVDF\ binder system has only 37.9 mAh g?1 (22.8%). In addition, the cycling stability of Li2ZnTi3O8 electrode has been improved after using \COS\ as binder. The elevated electrochemical performances of Li2ZnTi3O8 electrode with \COS\ binder system can be ascribed to the characters of \COS\ binder, which not only provide numerous hydroxyl groups formed strong hydrogen binds with both active materials and copper current collector, but also suppress swelling of electrode with electrolyte solution.