由多功能粘合剂实现的有机电极中的高活性材料负载,ACS Applied Materials & Interfaces

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由多功能粘合剂实现的有机电极中的高活性材料负载
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-09-09 , DOI: 10.1021/acsami.2c10070
Alicia M Battaglia ₁ , Paniz Pahlavanlu ₁ , Eloi Grignon ₁ , So Young An ₁ , Dwight S Seferos _{1,

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Affiliation

有机电极因其低成本和可持续的特性而成为下一代锂离子电池的有希望的候选者；然而，它们的导电性和活性材料含量通常非常低。有机锂离子电池中使用的传统粘合剂是聚偏二氟乙烯（PVDF），但它不具有电化学活性，因此在不储存能量的情况下占据体积和质量。在这里，我们报道了一种有机混合离子电子导电聚合物，聚[norbornene-1,2-bis(C(O)OPEDOT)] ₂₅ - b -[norbornene-1,2-bis-(C(O)PEG ₁₂ )] ₂₅表示 PEDOT- b-为简单起见，PEG作为解决上述问题的阴极粘合剂。该聚合物包含聚 (3,4-乙烯二氧噻吩) (PEDOT) 官能团以提供电子传导性，以及聚 (乙二醇) (PEG) 链以赋予阴极复合材料离子传导性。我们比较了含有苝二亚胺 (PDI) 活性材料、导电碳和聚合物粘合剂（PVDF 或 PEDOT- b -PEG）的电极，它们具有不同的重量比，以研究活性材料负载和粘合剂类型对性能的影响。细胞。使用 PEDOT- b制备的锂离子电池与使用含 PVDF 的电极制备的正极相比，PEG 聚合物粘合剂在所有活性材料负载下均具有更高的容量和更低的阻抗，证明了作为一种新粘合剂的潜力，可在有机电极中实现更高的活性材料负载。制备这些聚合物的策略应广泛适用于其他类别的混合聚合物导体。

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High Active Material Loading in Organic Electrodes Enabled by a Multifunctional Binder

Organic electrodes are promising candidates for next-generation lithium-ion batteries due to their low cost and sustainable nature; however, they often suffer from very low conductivity and active material loadings. The conventional binder used in organic-based Li-ion batteries is poly(vinylidene fluoride) (PVDF), yet it is electrochemically inactive and thus occupies volume and mass without storing energy. Here, we report an organic mixed ionic-electronic conducting polymer, poly[norbornene-1,2-bis(C(O)OPEDOT)]₂₅-b-[norbornene-1,2-bis-(C(O)PEG₁₂)]₂₅ denoted PEDOT-b-PEG for simplicity, as a cathode binder to address the aforementioned issues. The polymer contains a poly(3,4-ethylenedioxythiophene) (PEDOT) functionality to provide electronic conductivity, as well as poly(ethylene glycol) (PEG) chains to impart ionic conductivity to the cathode composite. We compare electrodes containing a perylene diimide (PDI) active material, conductive carbon, and a polymeric binder (either PVDF or PEDOT-b-PEG) with different weight ratios to study the impact of active material loading and type of binder on the performance of the cell. The lithium-ion cells prepared with the PEDOT-b-PEG polymer binder result in higher capacities and decreased impedance at all active material loadings compared to cathodes prepared with the PVDF-containing electrodes, demonstrating potential as a new binder to achieve higher active material loadings in organic electrodes. The strategy of preparing these polymers should be broadly applicable to other classes of mixed polymer conductors.

更新日期：2022-09-09

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