Journal
JOURNAL OF POWER SOURCES
Volume 511, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230363
Keywords
Radical polymer; Graphene; Covalent graft; Composite material; Organic cathode
Funding
- National Science Fund for Distinguished Young Scholars [51825304]
- National Natural Science Foundation of China [51773223, 51773042, 51973040]
- Shanghai Scientific and Technological Innovation Project [18520711900, 18JC1410600, 18XD1422400, 20ZR1469000]
- China Scholarship Council (CSC) [201504910677]
- STIBET DAAD Scholarship at KIT
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Covalently grafting redox-active polymers to graphene can enhance energy storage performance in Li-ion/Na-ion batteries, with the optimized composite showing excellent capacity, cycling and rate stability due to reduced solubility and improved conductivity. This approach provides a promising strategy for developing high-performance organic cathode materials.
Covalently grafting redox-active polymer to graphene sheets is a practical approach for developing highperformance organic cathode materials. Here, we report a facile preparation of radical polymer poly(2,2,6,6-tetramethylpiperidin-1-oxyl-4-yl methacrylate) (PTMA) grafted graphene sheets (rGO) composites (rGO-g-PTMA) with various PTMA contents via one-step radical polymerization, and their applications as cathodes for Li-ion/Na-ion batteries. The energy storage capacity of rGO-g-PTMA is determined by the relative contribution from the battery-type redox reaction of PTMA and the pseudocapacitive behavior of rGO sheets. The optimized rGO-g-PTMA(50) composite with 50 wt% of PTMA shows excellent energy storage performance, which is almost two times higher than that of the physically blended rGO/PTMA(50) owing to reduced solubility of PTMA in electrolyte solution and improved electrical conductivity. As cathode materials for Li-ion/Na-ion batteries, rGO-g-PTMA(50) shows superior performance including high capacity, good cycling and rate stability. Hence, this covalently bonded radical polymers on graphene provide new option for developing high-performance organic cathode materials for Li-ion/Na-ion batteries.
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