用于具有高质量负载的锂离子电池中硅阳极的弹性交联粘合剂,ACS Applied Materials & Interfaces

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用于具有高质量负载的锂离子电池中硅阳极的弹性交联粘合剂
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-01-27 , DOI: 10.1021/acsami.2c16997
Shiyun Zhang ₁ , Kai Liu ₁ , Jian Xie ₁ , Xiongwen Xu ₂ , Jian Tu ₂ , Weixiang Chen ₃ , Fang Chen ₃ , Tiejun Zhu ₁ , Xinbing Zhao ₁

Affiliation

由于对高能量密度锂离子电池（LIB）的迫切需求，具有超高容量的硅（Si）引起了广泛关注。然而，其实际应用受到循环过程中Si阳极巨大体积变化的严重阻碍。开发适用于硅负极的新型粘合剂已被证明是提高其电化学性能的有效策略。在此，我们构建了一种三维网络粘合剂，其中聚丙烯酸 (PAA) 长链与一种氨基酸赖氨酸 (Lys) 交联。PAA/Lys 中丰富的极性基团使其能够通过氢键紧紧附着在 Si 颗粒上，交联结构可防止 PAA 链在颗粒体积变化时发生不可逆的滑动。所使用的硅是通过回收光伏废硅的可持续途径获得的。PAA/Lys粘合剂具有高弹性和强附着力，可以有效保持硅电极的结构完整性，提高其电化学性能。使用 PAA/Lys 粘合剂的硅电极表现出良好的循环稳定性（1008 mAh g^–1 at 2 A g ^–1 after 250 cycles). ^{即使具有 3.03 mg cm –2}的高质量负载，Si 阳极也可以在 3.03 mAh cm ^–2的高固定面积容量下保持稳定 100 个循环。这项工作提供了一种使用可持续硅源和环保型氨基酸基粘合剂制造稳定硅电极的实用方法。

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An Elastic Cross-Linked Binder for Silicon Anodes in Lithium-Ion Batteries with a High Mass Loading

Due to the urgent demand for lithium-ion batteries (LIBs) with a high energy density, silicon (Si) possessing an ultrahigh capacity has aroused wide attention. However, its practical application is seriously hindered by enormous volume changes of the Si anode during cycling. Developing novel binders suitable for the Si anode has proven to be an effective strategy to improve its electrochemical performance. Herein, we constructed a three-dimensional network binder, in which the polyacrylic acid (PAA) long chains are cross-linked with one kind of amino acid, lysine (Lys). The abundant polar groups in PAA/Lys enable it to tightly adhere to the Si particles via hydrogen bonds, and the cross-linked structure prevents irreversible slipping of the PAA chains upon volume variation of the particles. The Si used was obtained from a sustainable route by recycling photovoltaic waste silicon. With high elasticity and strong adhesion, the PAA/Lys binder can effectively keep the structural integrity of the Si electrode and improve its electrochemical performance. The Si electrode using the PAA/Lys binder exhibits a good cycling stability (1008 mAh g^–1 at 2 A g^–1 after 250 cycles). Even with a high mass loading of 3.03 mg cm^–2, the Si anode can remain stable for 100 cycles at a high fixed areal capacity of 3.03 mAh cm^–2. This work gives a practical method to make stable Si electrodes using sustainable Si source and environmentally friendly amino acid-based binders.

更新日期：2023-01-27

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