A Robust Ion-Conductive Biopolymer as a Binder for Si Anodes of Lithium-Ion Batteries
A Robust Ion-Conductive Biopolymer as a Binder for Si Anodes of Lithium-Ion Batteries
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一种坚固的离子导电生物聚合物作为锂离子电池硅阳极的粘合剂
DOI：
10.1002/adfm.201500589
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发表时间：
2015-06-17
影响因子：
19
通讯作者：
Sun, Shi-Gang
中科院分区：
文献类型：
--
作者：
Liu, Jie;Zhang, Qian;Sun, Shi-Gang
粘结剂在提高锂离子电池硅负极材料的循环性能方面起着关键作用。本研究首次将生物聚合物瓜尔胶（GG）作为粘结剂应用于锂离子电池的硅纳米颗粒（SiNP）阳极。由于GG分子中有大量的极性羟基，GG结合剂和SiNPs之间实现了强大的相互作用，从而在循环过程中产生稳定的Si阳极。更具体地说，GG粘合剂可以有效地将锂离子转移到Si表面，类似于聚乙烯氧化物固体电解质。当GG作为粘合剂使用时，SiNP阳极的初始放电容量高达3364 mAh g(-1)，在2100 mA g（-1）电流密度下库仑效率为88.3%，在300次循环后保持1561 mAh g（-1）的容量。研究表明，与海藻酸钠粘结剂的SiNP阳极相比，GG粘结剂的SiNP阳极的电化学性能得到了显著提高，GG是一种很有前途的锂离子电池硅阳极粘结剂。
Binders have been reported to play a key role in improving the cycle performance of Si anode materials of lithium-ion batteries. In this study, the biopolymer guar gum (GG) is applied as the binder for a silicon nanoparticle (SiNP) anode of a lithium-ion battery for the first time. Due to the large number of polar hydroxyl groups in the GG molecule, a robust interaction between the GG binder and the SiNPs is achieved, resulting in a stable Si anode during cycling. More specifically, the GG binder can effectively transfer lithium ions to the Si surface, similarly to polyethylene oxide solid electrolytes. When GG is used as a binder, the SiNP anode can deliver an initial discharge capacity as high as 3364 mAh g(-1), with a Coulombic efficiency of 88.3% at the current density of 2100 mA g(-1), and maintain a capacity of 1561 mAh g(-1) after 300 cycles. The study shows that the electrochemical performance of the SiNP anode with GG binder is significantly improved compared to that of a SiNP anode with a sodium alginate binder, and it demonstrates that GG is a promising binder for Si anodes of lithium-ion batteries.