Li-ion polymer battery based on phase-separated gel polymer electrolyte

• Published in: Electrochimica acta Vol. 45; no. 24; pp. 4001 - 4007
• Main Authors: Kim, Hee-Tak, Kim, Kyoung-Bae, Kim, Sun-Wook, Park, Jung-Ki
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.08.2000; Elsevier
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; EC/DMC; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Gel polymer; Li-ion battery; PVC/PMMA; PVC/PMMA; EC/DMC; Li-ion battery; Gel polymer; Cycling; Lithium Ions; Polymer blends; Organic carbonate; Ionic conductivity; Polymer solid electrolyte; Methyl methacrylate polymer; Secondary cell; Organic solvent; Morphology; Battery; Polyvinyl chloride; Specific capacity; Electrical characteristic
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/S0013-4686(00)00489-8

The characteristics of the Li ion battery based on poly(vinyl chloride)/poly(methyl methacrylate) (PVC/PMMA) polymer blend electrolyte are reported. The polymer blend electrolytes exhibited phase-separated structure which consists of a PVC-rich phase and an electrolyte-rich phase. At the constant blend ratio of PVC/PMMA=6/4, mechanical property and ionic conductivity increase with the increase of the polarity of the liquid electrolyte together with the decrease of domain size of the electrolyte-rich phase. However, these merits obtained by using the liquid electrolyte of high polarity were somewhat contrasted by the low adhesion of the corresponding polymer electrolyte toward electrode. The prototype battery cell, which consists of LiCoO 2 cathode, meso-phase carbon fiber anode and the polymer electrolyte based on PVC/PMMA=6/4 blend and 1M LiPF 6 in EC/DMC=1/1 mixture, showed the discharge capacity of 111 mAh/g (per cathode material) at charge/discharge rate of 2 C and 92% of the initial discharge capacity at 100 cycle upon the repeated charge/discharge at 0.5 C rate (0.5×complete charge/discharge in 1 h).