| 卢海,李涛,王金磊,易大伟,赖延清.化学通报,2017,80(10):948-952. |
| 锂硫电池硫正极粘结剂的比较研究 |
| Comparative Study of Different Binders for Sulfur Cathode of Lithium Sulfur Battery |
| 投稿时间：2017-05-21 修订日期：2017-06-24 |
| DOI： |
| 中文关键词: 锂硫电池 硫正极 粘结剂 电化学性能 |
| 英文关键词:lithium sulfur battery sulfur cathode binder electrochemical performance |
| 基金项目:国家自然科学基金（51604221、51641105）；陕西省重点科技创新团队（2014KCT-04）；西安科技大学科研培育基金（201604） |
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| 中文摘要: |
| 三类粘结剂体系（PVDF、LA133和CMC+SBR）被用于构筑锂硫电池硫正极。论文表征了不同粘结剂材料的官能团结构、结晶性能、热力学性质、电解液吸收性与粘结强度，考察了粘结剂种类对电极电化学性能的影响。结果表明：1:1质量比的CMC+SBR制作的硫电极吸液率低，剥离强度低，循环稳定性较差。无定型态LA133支持高的粘结强度，维稳电极结构的能力强。PVDF因半结晶状态制约粘结效果，制作的电极吸液量高，但电荷转移阻抗小。基于PVDF制作的硫正极具有相对最优的电化学性能，其0.2 C循环100周后保留的可逆容量达722 mAh g-1，容量保持率达82.9%。 |
| 英文摘要: |
| Three kinds of binder systems (PVDF, LA133, CMC+SBR with 1:1 mass ratio) were employed for constructing sulfur electrode of Li-S battery. The molecule structures, crystallization properties, thermodynamic properties, electrolyte absorption and binding strength of various materials were characterized. The effects of binder type on the electrochemical properties of Li-S battery were investigated. Low electrolyte uptake, weak peel strength and poor cycle capability appears in the sulfur cathode fabricated by CMC+SBR. Amorphous LA133 favors high binding strength and stable electrode structure. PVDF leads to poor adhesion quality due to its semi crystalline, and the constructed cathode produces high electrolyte absorption but low charge transfer resistance. In contrast, a reversible capacity of 722 mAh g-1 and capacity retention rate of 82.9% after 100 cycles at 0.2 C is exhibited in the PVDF-based cathode, which is the best performance level among three binder cases. |
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