A novel polymer composite as cathode binder of lithium ion batteries with improved rate capability and cyclic stability

作者：Fu, Z; Feng, H L; Xiang, X D; Rao, M M; Wu, W; Luo, J C; Chen, T T; Hu, Q P; Feng, A B; Li, W S^*

来源：Journal of Power Sources, 2014, 261(Sep.1): 170-174.

DOI：10.1016/j.jpowsour.2014.03.087

• Maleic anhydride-grated-polyvinylidene
• fluoride
• Cathode
• Binder
• Lithium ion battery

In this work, we have developed a novel polymer composite (MPVDF) by embedding maleic anhydridegrated-polyvinylidene fluoride (MA-g-PVDF) into polyvinylidene fluoride (PVDF) as binder of LiCoO2 cathode for lithium ion battery. The cathodes using MPVDF and PVDF as binder have been comparatively investigated with scanning electron microscope (SEM), X-ray diffraction (XRD) and electrochemical measurements. By using MPVDF as the binder for preparing LiCoO2 cathode, the rate capability and cyclic stability of the LiCoO2 cathode in LiCoO2/Artificial graphite battery are improved significantly. Compared to the cathode using PVDF alone, the discharge capacity of the battery increases by 38.5% at 2 C and the capacity retention of the battery is improved from 84.5% to 90.2% after 300 cycles at 0.5 C when the mass ratio of MA-g-PVDF to PVDF in MPVDF binder is 1:4. The improved performance is attributed to the low crystallinity of MPVDF, which allows larger electrolyte uptake. The electrolyte uptake is 43.5% for the LiCoO2 cathode using MPVDF but only 25.3% for the cathode using PVDF alone.

• 出版日期2014-9-1
• 单位华南师范大学