期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 11, 页码 14460-14469出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b03117
关键词
Lignin; Linear copolymer; Composite polymer electrolyte membrane; Lithium batteries
资金
- National Natural Science Foundation of China [51073170]
- Innovation Program of CAS Combination of Molecular Science and Education
Lignin is an eco-friendly, low-cost, and abundant natural biopolymer. However, few studies have explored the potential application of lignin as electrolyte matrix for lithium-ion batteries or obtained excellent cell performance using lignin based electrolyte. In this paper, lignin and poly(N-vinylimidazole)-co-poly(poly(ethylene glycol) methyl ether methacrylate) are mixed thoroughly in water, then a free-standing lignin-based film is obtained by casting and drying. The resulting film shows obviously higher mechanical strength (over 10 times) than that of the pure lignin film due to the construction of internal physical cross-linking network. Through activation of the prepared film by organic electrolyte, the membrane exhibits superior electrochemical performances (such as outstanding lithium-ion transfer number (0.63) and the ability to inhibit the growth of lithium dendrites). As a result, the LiFePO4/lignin-based electrolyte/Li cell presents excellent long cycle performance (similar to 150 mAh g(-1) at 1 C more than 450 cycles) and rate capacity (110 mAh g(-1) at 10 C) at room temperature (RT), which is better than that of the cells using a commercial separator. Moreover, the LiCoO2/lignin-based electrolyte/Li cell also shows superior cell performance at RT. Thus, the lignin-based electrolyte with the outstanding comprehensive property has the potential to replace separator and to be widely applied in high-performance and high-safety LIBs.
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