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Chitosan-g-Poly(acrylic acid) Copolymer and Its Sodium Salt as Stabilized Aqueous Binders for Silicon Anodes in Lithium-Ion Batteries
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-09-11 , DOI: 10.1021/acssuschemeng.9b03307 Yang Gao , Xiaotao Qiu , Xiuli Wang , Aiqun Gu , Li Zhang , Xianchun Chen , Junfeng Li 1 , Zili Yu
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-09-11 , DOI: 10.1021/acssuschemeng.9b03307 Yang Gao , Xiaotao Qiu , Xiuli Wang , Aiqun Gu , Li Zhang , Xianchun Chen , Junfeng Li 1 , Zili Yu
Affiliation
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Silicon (Si) anodes display high specific capacity but mostly suffer from poor cycling ability owing to their dramatic volume expansion during the discharge/charge process. An effort was devoted to developing new polymeric binders that could effectively mitigate the capacity fading of Si anodes. Herein, aqueous binders of chitosan-g-poly(acrylic acid) copolymer (CS–PAA) and its sodium salt (CS–PAANa) have been synthesized and applied as the functional binders for the stabilization of Si anodes in lithium-ion batteries. The structure and properties of Si anodes based on CS–PAA and CS–PAANa were comparatively characterized by using poly(vinylidene fluoride), chitosan, and poly(acrylic acid) as reference binders. Unlike conventional 1D structural binders, the CS–PAA and CS–PAANa form a cross-linked (3D) network during curing, which maintains mechanical integrity to mitigate Si nanoparticle pulverization effectively. Moreover, the abundant polar groups including carboxylic acid (−COOH) and carboxylate (−COO–) in the two binders could react with both Si nanoparticles and copper (Cu) current collector to offer robust adhesion, significantly improving electrode integrity after the repeated delithiation/lithiation cycles. Benefitting from the structural advantages, the Si/CS–PAA and Si/CS–PAANa electrodes deliver stable cycling performances of 1243 and 1608 mA h/g at 420 mA/g after 100 cycles.
中文翻译：
壳聚糖-g-聚（丙烯酸）共聚物及其钠盐作为稳定的锂离子电池中硅阳极的水基粘合剂
硅（Si）阳极显示出高的比容量，但由于其在放电/充电过程中的体积急剧膨胀，因此大多具有较差的循环能力。致力于开发可以有效减轻硅阳极容量衰减的新型聚合物粘合剂。在本文中，脱乙酰壳多糖的水性粘合剂克合成了聚（丙烯酸）共聚物（CS-PAA）及其钠盐（CS-PAANa），并将其用作稳定锂离子电池中硅阳极的功能性粘合剂。通过使用聚偏二氟乙烯，壳聚糖和聚丙烯酸作为参考粘合剂，比较地表征了基于CS-PAA和CS-PAANa的Si阳极的结构和性能。与传统的一维结构粘合剂不同，CS–PAA和CS–PAANa在固化过程中形成交联（3D）网络，该网络保持机械完整性以有效缓解Si纳米颗粒的粉化。此外，丰富的极性基团包括羧酸（-COOH）和羧酸盐（-COO –）中的两种粘合剂可同时与Si纳米颗粒和铜（Cu）集流体反应以提供牢固的附着力，从而在重复的脱锂/锂化循环后显着提高了电极的完整性。受益于结构优势，Si / CS-PAA和Si / CS-PAANa电极在100个循环后，在420 mA / g时可提供1243和1608 mA h / g的稳定循环性能。
更新日期：2019-09-12
中文翻译：
壳聚糖-g-聚（丙烯酸）共聚物及其钠盐作为稳定的锂离子电池中硅阳极的水基粘合剂
硅（Si）阳极显示出高的比容量，但由于其在放电/充电过程中的体积急剧膨胀，因此大多具有较差的循环能力。致力于开发可以有效减轻硅阳极容量衰减的新型聚合物粘合剂。在本文中，脱乙酰壳多糖的水性粘合剂克合成了聚（丙烯酸）共聚物（CS-PAA）及其钠盐（CS-PAANa），并将其用作稳定锂离子电池中硅阳极的功能性粘合剂。通过使用聚偏二氟乙烯，壳聚糖和聚丙烯酸作为参考粘合剂，比较地表征了基于CS-PAA和CS-PAANa的Si阳极的结构和性能。与传统的一维结构粘合剂不同，CS–PAA和CS–PAANa在固化过程中形成交联（3D）网络，该网络保持机械完整性以有效缓解Si纳米颗粒的粉化。此外，丰富的极性基团包括羧酸（-COOH）和羧酸盐（-COO –）中的两种粘合剂可同时与Si纳米颗粒和铜（Cu）集流体反应以提供牢固的附着力，从而在重复的脱锂/锂化循环后显着提高了电极的完整性。受益于结构优势，Si / CS-PAA和Si / CS-PAANa电极在100个循环后，在420 mA / g时可提供1243和1608 mA h / g的稳定循环性能。
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