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首页> 外文期刊>Journal of power sources >Influence of polymeric binders on mechanical properties and microstructure evolution of silicon composite electrodes during electrochemical cycling
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Influence of polymeric binders on mechanical properties and microstructure evolution of silicon composite electrodes during electrochemical cycling

机译：聚合物粘合剂对硅复合电极电化学循环过程中力学性能和微观结构演变的影响

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摘要

Polymeric binders are a critical component to enhance mechanical integrity, maintain electronic conductivity, and achieve long durability of silicon (Si)-based electrodes. A fundamental understanding of the relationship between binder properties and mechanical degradation of Si electrodes is indispensable to developing durable Si-based electrodes. Using an environmental nanoindentation system, we measured the mechanical properties of Si composite electrodes made with different binders, including polyvinylidene fluoride (PVDF), Nafion, sodium-carboxymethyl cellulose (Na-CMC), and sodium-alginate (SA), as a function of the state-of-charge and cycle numbers under both dry and wet conditions. In contrast to electrodes made of Si alone, both elastic modulus (E) and hardness (H) of Si composite electrodes increase with lithium concentration within each cycle. E and H continuously decrease during long-term cycling. The mechanical property evolution of Si composite electrodes can be correlated with the porosity and irreversible thickness changes, which are largely determined by the mechanical properties of binders, instead of the adhesion between binders and Si. Electrodes under wet conditions have smaller E and H values than those under dry conditions because binders soften in the electrolyte. These findings not only provide useful mechanical parameters for battery modeling, but also may help design high performance and durable Si-based electrodes.
机译：聚合物粘合剂是增强机械完整性，保持电子导电性以及实现硅（Si）基电极长久耐用性的关键成分。对粘合剂性能和硅电极机械降解之间关系的基本理解对于开发耐用的硅基电极是必不可少的。使用环境纳米压痕系统，我们测量了由不同粘合剂（包括聚偏二氟乙烯（PVDF），Nafion，羧甲基纤维素钠（Na-CMC）和海藻酸钠（SA））制成的硅复合电极的机械性能干燥和潮湿条件下的荷电状态数和循环数。与仅由Si制成的电极相比，Si复合电极的弹性模量（E）和硬度（H）均在每个循环内随锂浓度而增加。在长期循环中，E和H持续降低。 Si复合电极的机械性能演变可能与孔隙率和不可逆的厚度变化相关，而孔隙率和不可逆的厚度变化很大程度上取决于粘合剂的机械性能，而不是粘合剂与Si之间的粘附性。湿态条件下的电极的E和H值比干态条件下的E和H值小，因为粘合剂会使电解质软化。这些发现不仅为电池建模提供了有用的机械参数，而且还可以帮助设计高性能和耐用的硅基电极。

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