摘要:
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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分类:
物理学
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普通物理:统计和量子力学,量子信息等
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引用:
ChinaXiv:201705.00131
(或此版本
ChinaXiv:201705.00131V1)
DOI:10.12074/201705.00131V1
CSTR:32003.36.ChinaXiv.201705.00131.V1
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科创链TXID:
b77f6e93-5536-4127-b752-88f5c08e394a
- 推荐引用方式:
Qin, DJ [Qin, Dejun][ 1 ],Xue, LX [Xue, Lixin][ 1 ],Du, B [Du, Bing][ 1 ],Wang, J [Wang, Jian][ 1 ],Nie, F [Nie, Feng][ 1 ],Wen, LL [Wen, Lele][ 1 ].Flexible fluorine containing ionic binders to mitigate the negative impact caused by the drastic volume fluctuation from silicon nano-particles in high capacity anodes of lithium-ion batteries.中国科学院科技论文预发布平台.[ChinaXiv:201705.00131V1]
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