一种水性多功能粘结剂对锂硫电池性能的影响（急）

Effect of a water-based multifunctional binder on the performance of lithium-sulfur battery

摘要:

以海藻酸钠(SA)与聚乙烯亚胺(PEI)为原料，制备了一种具有交联网络结构的海藻酸钠交联聚乙烯亚胺（SAPEI）多功能锂硫电池正极水性黏结剂。研究了SAPEI黏结剂的黏结性、多硫离子吸附能力，以及对锂硫电池正极结构和电化学性能的影响。结果表明，SAPEI黏结剂的黏结强度高于传统商用（PVDF）黏结剂，同时反应过程中产生的酰胺键对多硫离子具有吸附作用。使用SAPEI黏结剂的锂硫电池在循环后硫正极呈现出更加均匀的微观形貌结构和更优的电化学性能。在0.2 C倍率下充放电200次后其放电比容量仍然保持在620 mA·h/g，容量保持率可达到72.5％，高于使用PVDF黏结剂的锂硫电池。

Abstract:

A multifunctional sodium alginate crosslinked polyethyleneimine (SAPEI) water-based binder with cross-linked network structure for lithium sulfide battery cathode was created using sodium alginate (SA) and polyethyleneimine (PEI) as the raw materials. The ability of the SAPEI binder for adhesion and polysulfide adsorption, as well as its effects on the composition and electrochemical functionality of the lithium sulfur battery cathode, were investigated. The findings demonstrate that the SAPEI binder has a stronger binding capacity than conventional commercial (PVDF) binder, and that the reaction's amide bond has an adsorption impact on polysulfide ions. After cycling, the lithium-sulfur battery with SAPEI binder had a more consistent microstructure and improved electrochemical performance. The specific discharge capacity is still 620 mA·h/g after 200 cycles of charging and discharging at a rate of 0.2 C, and the capacity retention rate can reach 72.5%, which is higher than that of a lithium-sulfur battery employing PVDF binder.