本文研究了聚偏氟乙烯-六氟丙烯(PVdF-)的电化学性能
有限公司-HFP),其已经与氧化锌(ZnO)纳米填料的掺入成功地制备柔性纳米复合聚合物电解质。首先,纳米填料在聚合物基质中以形成柔性纳米复合PVDF-
有限公司-HFP聚合物膜(PI-CMPM),它是由相转化技术获得的。PI-CMPM的接触角具有最大的136°来实现。一个fter this procedure, it has been activated by using a 1.0 M LiClO4含DMC/EC (1:1)
v/
v电解质溶液得到柔性纳米复合聚合物电解质(PI-CMPE)。优化后的PI-CMPM提高了电解液吸收量150%。达到最大的离子电导率值
2.47
×
10
−
3.年代厘米−1在室温下。优化后的PI-CMPE最大迁移数为0.61,进一步证明了高性能锂离子聚合物电池的制造能力。
FE-SEM studies were carried out by means of JEOL Field Emission Scanning Electron Microscopy (FE-SEM) with step-up voltage range of 20 kV to investigate the surface morphology of PI-CMPM.
计算了PI-CMPM在1m LiClO中的电解质溶液吸收情况4含DMC/EC电解质6 h,得到相应的柔性纳米复合聚合物电解质[
23]。这些膜吸收电解质溶液的计算公式如下:
(1)
电解液
解决方案
吸收
重量
%
=
W
f
−
W
o
W
o
×
100
,在哪里
W
f和
W
o是湿和干弹性纳米复合聚合物膜(PI-CMPM)的重量,分别。
2.6。电解液泄漏研究
通过将柔性PI-CMPE放置在两张滤纸之间,然后用100g聚四氟乙烯薄片挤压来检测这些浸入式柔性pi - cmpm的电解质溶液泄漏情况[
22]。每隔10分钟观察应用柔性PI-CMPM电解质的重量变化
~
133.322
×
10
−
2爸爸的压力。柔性PI-CMPE的电解质溶液泄漏计算公式如下[
23]:
(2)
电解液
解决方案
泄漏
重量
%
=
W
我
−
W
f
W
我
−
W
o
×
100
,在哪里
W
o是干式PI-CMPM的重量和
W
我和
W
f分别为PI-CMPM吸收液态电解质后的初始权重和平衡权重。
2.7。离子电导率的研究
的柔性PI-CMPEs离子电导率是由两个不锈钢电极非阻塞[之间在夹着PI-CMPE调查
22]。Conductivity measurements were carried out by using a Hioki LCR HiTESTER at a wide frequency range of 10 Hz to100 kHz at different temperatures ranging from 25 to 80°C. The ionic conductivity of both these PI-CMPMs was calculated using the conductivity equation [
23]:
(3)
σ
=
t
一个
×
R
b
年代
c
米
−
1
,在哪里
σ为离子电导率,
tPI-CMPE的厚度是多少
R
b和
一个是体电阻和分别柔性PI-CMPE的横截面面积。
数字
4(一)描绘了柔性的纳米复合聚合物膜的溶液吸收。可以清楚地看到,在PVDF-添加纳米填料
有限公司-HFP polymer matrix has increased the solution uptake from 2 wt% to 6 wt%. Optimized (6 wt%) concentration of flexible PI-CMPM was found to have a high degree of solution uptake (210%) than the 8 wt% and 10 wt% filler concentration (Table
1)。这表明,当电导率较好的体系在1小时内饱和时,可以获得较高的电解质吸收。
(一)电解液吸收offlexible nanocomposite polymer membranes based on various wt% of ZnO (2, 4, 6, 8, and 10 wt%) on a PVdF-
有限公司-HFP矩阵。(b)该相位反转的纳米复合材料的聚合物电解质的溶液泄漏(PVDF-
有限公司六氟+ LiClO4+ZnO) at room temperature with various wt% of ZnO (0,2, 4, 6, 8, and 10 wt% nanofiller).
数字
8给出了优化后的柔性PI-CMPE的电流-电压响应曲线。在2.0和5.5 V vs. Li之间以10 mV s的扫描速率扫描电势-1。起始电流流量与聚合物电解质的分解电压有关[
34]。从电流响应的大小可以得到分解电压,当电压低于4.6 V(相对于Li/Li)时,不会发生高的电化学氧化+),和the current sharply increases when the voltage is 4.7 V. The stability of the PI-CMPE is influenced partially by the weight percentage of the nanofiller content in the polymer electrolyte.
PI-CMPE的线性扫描伏安法。
4.结论
柔性纳米复合材料聚(偏氟乙烯-共六氟丙烯)(PVdF-
有限公司-HFP)聚合物膜(PI-CMPM)中的相转化法使用N-甲基吡咯烷酮作为溶剂制备的。PI-CMPM的水接触角都实现了最大的136°,以确定疏水性。一个flexible nanocomposite polymer electrolyte was obtained from their respective PI-CMPM when it was soaked in an electrolyte solution (1.0 M LiClO4载有法定法定日期/法定日期(
v
/
v
=
1
:
1)]。The PI-CMPM mechanical strength has been increased up to 281 kPa. The optimized membrane increases the liquid electrolyte uptake of 150%. It may be further evidence that the prepared electrolyte is a good candidate to fabricate high performance lithium ion polymer batteries.