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Greatly Improved Conductivity of Double‐Chain Polymer Network Binder for High Sulfur Loading Lithium–Sulfur Batteries with a Low Electrolyte/Sulfur Ratio
Small ( IF 13.0 ) Pub Date : 2018-07-20 , DOI: 10.1002/smll.201801536 Xuejun Liu 1 , Tao Qian 1 , Jie Liu 1 , Jinghua Tian 1 , Li Zhang 1 , Chenglin Yan 1
Small ( IF 13.0 ) Pub Date : 2018-07-20 , DOI: 10.1002/smll.201801536 Xuejun Liu 1 , Tao Qian 1 , Jie Liu 1 , Jinghua Tian 1 , Li Zhang 1 , Chenglin Yan 1
Affiliation
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Binders have been considered to play a key role in realizing high‐energy‐density lithium–sulfur batteries. However, the accompanying problems of limited conductivity and inferior affinity of soluble polysulfide intermediates bring down their comprehensive performance for practical applications. Herein, the synthesis of a novel double‐chain polymer network (DCP) binder by polymerizing 4,4′‐biphenyldisulfonic acid connected pyrrole monomer onto viscous sodium carboxymethyl cellulose matrix, yielding a primary crystal structure is reported. Consequently, the resulted binder enables superior rate performance from 0.2 C (1326.9 mAh g−1) to 4 C (701.4 mAh g−1). Moreover, a high sulfur loading of 9.8 mg cm−2 and a low electrolyte/sulfur ratio (5:1, µL mg−1) are achieved, exhibiting a high area capacity of 9.2 mAh cm−2. In situ X‐ray diffraction analysis is conducted to monitor the structural modifications of the cathode, confirming the occurrence of sulfur reduction/recrystallization during charge–discharge process. In addition, in situ UV–vis measurements demonstrate that DCP binder impedes the polysulfide migration, thereby giving rise to high capacity retention for 400 cycles.
中文翻译：
低电解质/硫比的高硫载量锂硫电池用双链聚合物网络粘合剂的导电性大幅提高
粘合剂被认为在实现高能量密度锂硫电池中发挥着关键作用。然而，可溶性多硫化物中间体有限的电导率和较差的亲和力问题降低了其实际应用的综合性能。在此，报道了通过将 4,4'-联苯二磺酸连接的吡咯单体聚合到粘性羧甲基纤维素钠基质上合成了一种新型双链聚合物网络（DCP）粘合剂，产生一级晶体结构。因此，所得粘合剂能够实现0.2C（1326.9mAh g -1 ）至4C（701.4mAh g -1 ）的优异倍率性能。此外，实现了9.8 mg cm -2的高硫负载量和低电解质/硫比（5:1，μL mg -1 ），表现出9.2 mAh cm -2的高面积容量。通过原位X射线衍射分析来监测正极的结构变化，确认充放电过程中硫还原/再结晶的发生。此外，原位紫外-可见光测量表明，DCP 粘合剂可阻止多硫化物迁移，从而在 400 次循环中实现高容量保持。
更新日期：2018-07-20
中文翻译：
低电解质/硫比的高硫载量锂硫电池用双链聚合物网络粘合剂的导电性大幅提高
粘合剂被认为在实现高能量密度锂硫电池中发挥着关键作用。然而，可溶性多硫化物中间体有限的电导率和较差的亲和力问题降低了其实际应用的综合性能。在此，报道了通过将 4,4'-联苯二磺酸连接的吡咯单体聚合到粘性羧甲基纤维素钠基质上合成了一种新型双链聚合物网络（DCP）粘合剂，产生一级晶体结构。因此，所得粘合剂能够实现0.2C（1326.9mAh g -1 ）至4C（701.4mAh g -1 ）的优异倍率性能。此外，实现了9.8 mg cm -2的高硫负载量和低电解质/硫比（5:1，μL mg -1 ），表现出9.2 mAh cm -2的高面积容量。通过原位X射线衍射分析来监测正极的结构变化，确认充放电过程中硫还原/再结晶的发生。此外，原位紫外-可见光测量表明，DCP 粘合剂可阻止多硫化物迁移，从而在 400 次循环中实现高容量保持。
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