当前位置: X-MOL 学术Electrochim. Acta › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A new composite gel polymer electrolyte based on matrix of PEGDA with high ionic conductivity for lithium-ion batteries
Electrochimica Acta ( IF 5.5 ) Pub Date : 2020-07-03 , DOI: 10.1016/j.electacta.2020.136622
Meng Liu , Yue Wang , Meng Li , Guangqi Li , Bin Li , Songtong Zhang , Hai Ming , Jingyi Qiu , Junhong Chen , Pengcheng Zhao

New gel polymer electrolytes (GPEs) based on poly (ethylene glycol) diacrylate (PEGDA) were prepared through an in-situ thermal polymerization method in liquid electrolyte. Different from previous reports, PEGDA was utilized as a matrix instead of a cross-linking agent in this work. Cellulose acetate (CA) as an additive with plenty of polar groups was introduced by a simple solution blending to improve their electrochemical performance. The enhanced ion-dipole interaction of the polar groups with Li+ ions in the composite polymer electrolytes was studied, which affected the carbonyl and ether vibrational mode and weakened the symmetric vibration band of ion pairs. The exothermic peak of solvents decomposition that related to lithium salts shifted to a low temperature. After the introduction of CA additive, PEGDA/CA GPE exhibited excellent electrochemical performance, including a high ionic conductivity up to 8.81 × 10−3 S cm−1 at 30 °C, a high lithium ion transference number of 0.79 and an electrochemical window of 4.56 V. The electrode-electrolyte interface contact was improved due to the presence of CA with solvated viscosity. This study provides a new direction for the application of PEGDA and inspires that close attention should be paid to the interaction of Li+ ions with different polar groups for novel polymer electrolytes designing.



中文翻译:

基于PEGDA基体的高离子电导率的新型复合凝胶聚合物电解质锂离子电池

通过原位热聚合在液体电解质中制备了基于聚乙二醇二丙烯酸酯(PEGDA)的新型凝胶聚合物电解质(GPE)。与以前的报道不同,在这项工作中,PEGDA被用作基质而不是交联剂。通过简单的溶液混合引入醋酸纤维素(CA)作为具有大量极性基团的添加剂,以改善其电化学性能。极性基团与Li +的增强的离子-偶极相互作用研究了复合高分子电解质中的离子,影响了羰基和醚的振动模式,削弱了离子对的对称振动带。与锂盐有关的溶剂分解的放热峰移至低温。引入CA添加剂后,PEGDA / CA GPE表现出优异的电化学性能,包括在30°C时高达8.81×10 -3  S cm -1的高离子电导率,0.79的高锂离子迁移率和4.56V。由于存在具有溶剂化粘度的CA,电极-电解质界面接触得到改善。这项研究为PEGDA的应用提供了新的方向,并启发人们应密切注意Li +的相互作用。 具有不同极性基团的离子用于新型聚合物电解质设计。

更新日期:2020-07-05
down
wechat
bug