溶解铸膜法制备了PVA(聚乙烯醇)-KOH碱性聚合物电解质.用循环伏安和激光拉曼光谱对其电化学稳定性进行了研究,并将其应用于锌镍二次模拟电池.结果表明,该固态电解质具有较好的稳定性,循环寿命远远高于以5 m o l/L KOH水溶液为电解质的...溶解铸膜法制备了PVA(聚乙烯醇)-KOH碱性聚合物电解质.用循环伏安和激光拉曼光谱对其电化学稳定性进行了研究,并将其应用于锌镍二次模拟电池.结果表明,该固态电解质具有较好的稳定性,循环寿命远远高于以5 m o l/L KOH水溶液为电解质的锌镍电池.展开更多
通过溶液浇注法制备了一种polymer in salt型PVA KOH H2O聚合物电解质.对该电解质进行了X射线衍射、热性质及电化学性质测试与分析.X射线衍射显示PVA和KOH在聚合物电解质中均以非晶态存在.随着KOH含量的增加,聚合物的玻璃转化点温度逐...通过溶液浇注法制备了一种polymer in salt型PVA KOH H2O聚合物电解质.对该电解质进行了X射线衍射、热性质及电化学性质测试与分析.X射线衍射显示PVA和KOH在聚合物电解质中均以非晶态存在.随着KOH含量的增加,聚合物的玻璃转化点温度逐渐上升,而电解质电导率也随之增加.该电解质的电化学窗口可达1.4V,阻抗测试显示当电解质组成PVA/KOH为1/3(质量比)时,室温电导率可达0.15S/cm,电导率与温度关系符合Arrhenius方程.该电解质热力学稳定性好,机械强度高、电化学性质优越.展开更多
Polyvinyl alcohol （PVA）-sodium polyacrylate （PAAS）-KOH-H2O alkaline polymer electrolyte film with high ionic conductivity was prepared by a solution-casting method. Polymer Ni（OH）2/activated carbon （AC） hybrid...Polyvinyl alcohol （PVA）-sodium polyacrylate （PAAS）-KOH-H2O alkaline polymer electrolyte film with high ionic conductivity was prepared by a solution-casting method. Polymer Ni（OH）2/activated carbon （AC） hybrid supercapacitors with different electrode active material mass ratios （positive to negative） were fabricated using this alkaline polymer electrolyte, nickel hydroxide positive electrodes, and AC negative electrodes. Galvanostatic charge/ discharge and electrochemical impedance spectroscopy （EIS） methods were used to study the electrochemical performance of the capacitors, such as charge/discharge specific capacitance, rate charge/discharge ability, and charge/discharge cyclic stability. Experimental results showed that with the decreasing of active material mass ratio m（Ni（OH）2）/m（AC）, the charge/discharge specific capacitance increases, but the rate charge/discharge ability and the charge/discharge cyclic stability decrease.展开更多
基金supported by the National Natural Science Foundation of China (51363011)the 46th Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education, China (6488-20130039)+2 种基金Program of High-level Introduced Talent of Yunnan Provincein 2012, China (10978125)Yunnan Project of Training Talent, China (1418425)Project of Key Discipline, China (14078232)~~
文摘通过溶液浇注法制备了一种polymer in salt型PVA KOH H2O聚合物电解质.对该电解质进行了X射线衍射、热性质及电化学性质测试与分析.X射线衍射显示PVA和KOH在聚合物电解质中均以非晶态存在.随着KOH含量的增加,聚合物的玻璃转化点温度逐渐上升,而电解质电导率也随之增加.该电解质的电化学窗口可达1.4V,阻抗测试显示当电解质组成PVA/KOH为1/3(质量比)时,室温电导率可达0.15S/cm,电导率与温度关系符合Arrhenius方程.该电解质热力学稳定性好,机械强度高、电化学性质优越.
基金Supported by Leading Academic Discipline Project of Shanghai Municipal Education Commission (J50102)
文摘Polyvinyl alcohol （PVA）-sodium polyacrylate （PAAS）-KOH-H2O alkaline polymer electrolyte film with high ionic conductivity was prepared by a solution-casting method. Polymer Ni（OH）2/activated carbon （AC） hybrid supercapacitors with different electrode active material mass ratios （positive to negative） were fabricated using this alkaline polymer electrolyte, nickel hydroxide positive electrodes, and AC negative electrodes. Galvanostatic charge/ discharge and electrochemical impedance spectroscopy （EIS） methods were used to study the electrochemical performance of the capacitors, such as charge/discharge specific capacitance, rate charge/discharge ability, and charge/discharge cyclic stability. Experimental results showed that with the decreasing of active material mass ratio m（Ni（OH）2）/m（AC）, the charge/discharge specific capacitance increases, but the rate charge/discharge ability and the charge/discharge cyclic stability decrease.
