摘要
Sulfur has been paid close attention by the research and manufacturing as a cathode material for lithium-sulfur batteries(LSB)in recent decade because it has high specific capacity and low cost.But the low utilization of active materials and serious shuttle phenomenon inhibit its commercialization process.In this work,for the first time,water reducers are reported as multifunctional binders to address the above problems to enhance the performance of LSB.Due to the synthetic actions of the water reducer binder,such as highly dispersing effect and good chemical trapping function,commercial sulfur powders are directly used as cathodes,and much better electrochemical performance compared to using the conventional binder polyvinylidene fluoride(PVDF)was obtained,among which the sulfur cathode with sulfonated melamine formaldehyde(SMF)water reducer binder exhibits a high reversible capacity of 625.5 mA·h·g^(-1) after 200 cycles at 1 C and the cathode with polycarboxylic acid(PC)water reducer binder even demonstrates a high area specific capacity of 5 mA·h·cm^(-2) at high sulfur loading of 5 mg·cm^(-2).These low-cost water reducers are a promising binder for LSB in the future.
基金
The National Natural Science Foundation of China(Nos.51871113 and 51902036)
the Natural Science Foundation of Jiangsu Province(BK20200047)
the Natural Science Foundation of Chongqing Science&Technology Commission(No.cstc2019jcyj-msxml407)
the Venture&Innovation Support Program for Chongqing Overseas Returnees(No.CX2018129)
the Science and Technology Research Program of Chongqing Municipal Education Commission(Nos.KJQN201900826 and KJQN201800808)
the Innovation Group of New Technologies for Industrial Pollution Control of Chongqing Education Commission(No.CXQT19023)
the Key Disciplines of Chemical Engineering and Technology in Chongqing Colleges and Universities during the 13th Five Year Plan.
