期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 20, 页码 10928-10934出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta02367j
关键词
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资金
- National Natural Science Foundation of China [51273211, 51103171]
- Ministry of Science and Technology of China [2012AA03A605, 2012DFR50470, 2014BAJ02B02]
- Bureau of Science and Technology of Ningbo [2014B81004, 2014S10007, 2014B70023, 2013C910012]
- Ningbo Natural Science Foundation [2014A610137, 2014A610138, 2014A610194]
Novel ionic binders based on sulfonated polyether ether ketones and polysulfone backbones, bearing pendant lithiated fluorinated sulfonimide groups (SPEEK-PSI-Li and PSU-PSI-Li) were developed. Their performance in high performance silicon (Si) nano-particle anodes was studied in comparison with conventional binders such as lithiated sulfonated poly(ether-ether-ketone) containing fluorinated sulfonic acid side chains (SPEEK-PSA-Li), poly(vinylidene) difluoride (PVDF), sodium carboxymethyl cellulose (CMC) and alginate. Much superior to other anode binders, the ionic conducting SPEEK-PSI-Li binders could not only provide good adhesion properties, but also effectively reduce the over-potential during rapid charge and discharge cycles. When cycled at a current of 400 mA g(-1), these anodes could maintain above 2000 mA h g(-1) after 50 cycles. Even when cycled at a high current rate of 2000 mA g(-1), the anodes with SPEEK-PSI-Li binders could be cycled above 500 mA h g(-1) in 50 cycles. The superior performance of the novel SPEEK-PSI-Li binders could be attributed to their high cohesion capability, low solubility in electrolytes, high adaptability to volume fluctuation and high ionic conducting capability resulting from of the co-existence of flexible PEEK backbones, flexible fluorinated ether side chains, ionic transporting sulfonate groups, and pentadentate super ionic sulfonimide groups in the molecule structures.
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