聚偏氟乙烯（PVDF）的β相和α相比例优化有助于提高电池性能。

Improved battery performance contributed by the optimized phase ratio of β and α of PVDF.

作者信息

Ren Ya, Wang Ying, Zhang Wenlong, Yan Xiao, Huang Bixiong

机构信息

School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science Songjiang District Shanghai 201620 China

出版信息

RSC Adv. 2019 Sep 20;9(51):29760-29764. doi: 10.1039/c9ra04724g. eCollection 2019 Sep 18.

Inorganic salts (LiCl) were induced to improve the ratio of β and α of PVDF by the solution method. The vibrational spectra of PVDF polymorphic polymers were obtained by Fourier transform infrared spectroscopy (FTIR), and the results showed that the ratio of β and α of pristine PVDF was elevated from 43.66% to 53.27%. A small amount of LiCl grains was detected to be decorated on the surface of LiCl-involved electrodes by the SEM and EDS tests. The rate capability of the modified samples was evaluated when charge-discharged at 5C. The capacity of the 1/10LiCl@PVDF samples remained at a high level of 71.64% when charge-discharged at 5C, which was much higher than the value of 54.66% for pristine samples. The results of the CV and EIS tests revealed that the electrochemical polarization increasing rate and charge transfer resistance of the 1/10LiCl@PVDF samples were smaller than those of the pristine PVDF samples.

采用溶液法引入无机盐（LiCl）以提高聚偏氟乙烯（PVDF）的β相和α相比例。通过傅里叶变换红外光谱（FTIR）获得了PVDF多晶型聚合物的振动光谱，结果表明，原始PVDF的β相和α相比例从43.66%提高到了53.27%。通过扫描电子显微镜（SEM）和能谱仪（EDS）测试检测到少量LiCl颗粒附着在含LiCl电极的表面。在5C充放电条件下评估了改性样品的倍率性能。1/10LiCl@PVDF样品在5C充放电时的容量保持在71.64%的高水平，远高于原始样品的54.66%。循环伏安（CV）和电化学阻抗谱（EIS）测试结果表明，1/10LiCl@PVDF样品的电化学极化增加速率和电荷转移电阻均小于原始PVDF样品。