An effectively inhibiting lithium dendrite growth in-situ-polymerized gel polymer electrolyte
作者：Chaoqun Niu, Mingke Zhang, Guangping Chen, Bokai Cao, Jiwei Shi, Jie Du, Yong Chen
關鍵字：Lithium ion battery, In-situ polymerization, Lithium dendrite, Poly(ethylene glycol phenyl ether acrylate), Gel polymer electrolyte
論文來源：期刊
具體來源：Electrochimica Acta
發表時間：2018年
Polyacrylate polymer is a promising polymer matrix for gel polymer electrolyte (GPE ) in lithiu m-ion batteries. He rein, in-situ polymerized poly(ethylene glycol phenyl etheracrylate) (PEGPEA) based GPE combined with 1 M LiPF6 in ethylene carbonate/dimethyl carbonate/ethyl methyl carbonate (EC/DMC/EMC, 1:1:1 in volume) solvents was introduced. The maximum recoverable strain of the in-situ polymerized PEGPEA-GPE was up to 99%. The outstanding interfacial compatibility between PEGPEA-GPE and the lithium electrode was also obtained. Surprisingly, lithium dendrite was effectively suppressed in charge-discharge cycling because of polymer-enhanced solid electrolyte interphase (SEI) and excellent contact interface. Furthermore, the PEGPEA-GPE exhibited wide electrochemical stability window up to 4.9 V versus Li t/Li, and achieved an ionic conductivity of 3.35 103 S cm1 at 25 C. When used as electrolyte, the Li[Ni0.5Co0.2Mn0.3]O2/PEGPEA-GPE/Li batteries showed high discharge capacity retention rate of 97.5% after 70 charge-discharge cycles and considerable discharge rate capability, i.e., 155 mAh g1 0.2C, 142 mAh g1 0.5C, 120 mAh g1 1C, 60 mAh g1 2C. These results demonstrate that this highly elastic in-situ polymerized PEGPEA-GPE is a potential electrolyte system for high-performance polymer electrolyte lithium-ion batteries and has excellent application prospects in wearable and flexible batteries.