Polymer gel electrolyte supported with microporous polyolefin membranes for lithium ion polymer battery

Cycling performance of a lithium-ion polymer cell assembled by in-situ chemical cross-linking with fluorinated phosphorous-based cross-linking agent

“…The insufficient mechanical strength of gel polymer electrolytes is one of the most critical deficiencies preventing their use in practical lithium batteries. In order to overcome this problem, a microporous polyolefin membrane has been employed as a dimensional support so as to enhance the mechanical strength of gel polymer electrolytes [8][9][10][11][12][13][14][15]. The impregnation of a gel polymer electrolyte into the pores of a membrane has mainly been carried out through dipping and in-situ polymerization.…”

Electrochemical performance of methyl methacrylate graft-copolymerized composite separator based on radiation polymerization technique

“…In fact, the method usually consisted of complicated preparation steps or accompanied by an inconvenient membrane-forming technology. (3) Modification of microporous polyolefin separators, mainly including graft copolymerization [14][15][16][17] and gel-coated ways [18][19][20][21]: The obtained modified separators could combine high electrochemical performance, good mechanical strength, and excellent wettability to polar liquid electrolytes. Unfortunately, this way usually exhibited various deficiencies preventing them from practical applications, such as thicker grafted or coated layer, easy peeling from substrate, more difficult assemblage, and increasing difficulties in high-speed manufacture process.…”

Preparation of polymer-coated separators using an electron beam irradiation

“…However, commercial lithium polymer batteries still need a separator because it affords an adequate ionic conductivity with adequate mechanical properties to support the winding tension of an anode/polymer polymer electrolyte/cathode in an assembly process. So far, several methods including a dip-coating, thermal treatment, UV radiation, chemical initiator, plasma treatment and high energy radiation have been utilized to fabricate polymer electrolytes for lithium secondary batteries [11][12][13][14][15][16]. Especially, a high energy radiation is an attractive technique since it technique has many advantages: (1) the polymerization proceeds mildly and thoroughly; (2) the chemistry of the reaction system is free of a contamination (no initiators are needed); (3) and the energy consumption is relatively low [17][18][19][20][21][22][23][24][25][26].…”