锂盐对交联PPCMA聚合物电解质性能的影响

Effect of Lithium Salt on Performance of Crosslinked PPCMA Gel Polymer Electrolyte

以二氧化碳(CO2)、环氧丙烷(PO)和马来酸酐(MA)三元共聚反应合成聚甲基乙撑碳酸酯马来酸酐(PPCMA),再经交联和浸渍电解液活化,制备了性能优良的PPCMA凝胶聚合物电解质。研究发现,随着交联剂过氧化二异丙苯(DCP)的增加,交联PPCMA的玻璃化转变温度升高,热稳定性增强,PPCMA凝胶聚合物电解质的离子电导率先增加后减小,当DCP用量为1.2%、LiClO4浓度为1.1mol/dm3、LiBOB质量分数为1.3%时,PPCMA凝胶聚合物电解质的室温离子电导率达到最大值1.47×10-2S/cm。Li/PPCMAGPE/LiNi1/3Co1/3Mn1/3O2聚合物锂离子电池的首次放电容量为115.3mAh/g。

The poly（propylene carbonate）-co-（maleic anhydride） （PPCMA） polymer matrix was synthesized by terpolymerization of carbon dioxide,propylene oxide and maleic anhydride. The PPCMA matrix was then crosslinked and actived by absorbing liquid electrolyte to prepare a new PPCMA gel polymer electrolyte. With dicumyl peroxide （DCP） amount increasing,the Tg,the thermal stability increased and the ionic conductivity of the PPCMA gel polymer electrolyte firstly increased and then decreased. The ionic conductivity of the PPCMA gel polymer electrolyte with 1.2% amount of DCP reached the maximum value of 1.47×10-2 S/cm at room temperature when the LiClO4/ethylene carbonate（EC）/dimethyl carbonate（DMC） electrolyte content was 1.1 mol/dm3 and LiBOB content was 1.3%. The charge-discharge test results showed that the initial discharge capacity of Li/ PPCMA gel polymer electrolyte（GPE）/ LiNi1/3Co1/3Mn1/3O2 cell was 115.3 mAh/g at 0.1C current rate and in voltage range of 2.8 V～4.2 V at room temperature.