A new composite gel polymer electrolyte based on matrix of PEGDA with high ionic conductivity for lithium-ion batteries

2020 ◽  
Vol 354 ◽  
pp. 136622 ◽  
Author(s):  
Meng Liu ◽  
Yue Wang ◽  
Meng Li ◽  
Guangqi Li ◽  
Bin Li ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Lithium Ion Batteries ◽  
Polymer Electrolyte ◽  
Gel Polymer Electrolyte ◽  
Lithium Ion ◽  
High Ionic Conductivity ◽  
Composite Gel

scholarly journals A Novel Gel Polymer Electrolyte by Thiol-Ene Click Reaction Derived from CO2-Based Polycarbonate for Lithium-Ion Batteries

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Wenhan Luo ◽  
Kuirong Deng ◽  
Shuanjin Wang ◽  
Shan Ren ◽  
Dongmei Han ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Polymer Electrolyte ◽  
Polyvinylidene Fluoride ◽  
Lithium Iron Phosphate ◽  
Click Reaction ◽  
Gel Polymer Electrolyte ◽  
Lithium Ion ◽  
Liquid Lithium ◽  
Methoxypolyethylene Glycol ◽  
Composite Gel

Here, we describe the synthesis of a CO2-based polycarbonate with pendent alkene groups and its functionalization by grafting methoxypolyethylene glycol in view of its application possibility in gel polymer electrolyte lithium-ion batteries. The gel polymer electrolyte is prepared by an in-situ thiol-ene click reaction between polycarbonate with pendent alkene groups and thiolated methoxypolyethylene glycol in liquid lithium hexafluorophosphate electrolyte and exhibits conductivity as remarkably high as 2.0×10−2 S cm−1 at ambient temperature. To the best of our knowledge, this gel polymer electrolyte possesses the highest conductivity in all relevant literatures. A free-standing composite gel polymer electrolyte membrane is obtained by incorporating the gel polymer electrolyte with electrospun polyvinylidene fluoride as a skeleton. The as-prepared composite membrane is used to assemble a prototype lithium iron phosphate cell and evaluated accordingly. The battery delivers a good reversible charge-discharge capacity close to 140 mAh g-1 at 1 C rate and 25°C with only 0.022% per cycle decay after 200 cycles. This work provides an interesting molecular design for polycarbonate application in gel electrolyte lithium-ion batteries.

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