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A Universal Aqueous Conductive Binder for Flexible Electrodes
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-06-17 , DOI: 10.1002/adfm.202102284 Hanwei Wang 1 , Jinzhou Fu 2 , Chao Wang 1 , Ruiwang Zhang 2 , Yushan Yang 1 , Yingying Li 1 , Caicai Li 1 , Qingfeng Sun 1 , Huiqiao Li 2 , Tianyou Zhai 2
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-06-17 , DOI: 10.1002/adfm.202102284 Hanwei Wang 1 , Jinzhou Fu 2 , Chao Wang 1 , Ruiwang Zhang 2 , Yushan Yang 1 , Yingying Li 1 , Caicai Li 1 , Qingfeng Sun 1 , Huiqiao Li 2 , Tianyou Zhai 2
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The development of wearable electronics has led to new requirements for flexible and high-energy batteries. However, the conventional polyvinylidene fluoride binder fails in the manufacture of high-loaded and thick battery electrodes owing to its insufficient adhesiveness and electronic insulation, let alone for flexible devices. Furthermore, organic processing is expensive and not eco-friendly. Herein, the authors report a novel aqueous conductive binder made of carbon nanotubes interwoven in cellulose nanosheets, successfully satisfying the fabrication of flexible yet high-strength electrodes for universal active materials of different sizes, morphologies, and negative-to-positive working potentials, with a high mass loading of up to ≈90 mg cm−2. The conductive binder has an ultrathin 2D-reticular nanosheet structure that forms continuous conductive skeletons in electrodes to segregate and warp active particles via a robust “face-to-point” bonding mode, allowing the fabricated electrodes to have remarkable flexibility and excellent mechanical integrity even under various external forces and excessive electrolyte erosion. Flexible LCO cathodes with a mass loading of >30 mg cm−2 as a case study exhibit high mechanical strength (>20 MPa) and can easily achieve an ultrahigh areal capacity of 12.1 mAh cm−2. This cellulose-based binder system is ideal for advanced high-performance functional devices, especially for flexible and high-energy batteries.
中文翻译：
一种用于柔性电极的通用水性导电粘合剂
可穿戴电子产品的发展对柔性和高能电池提出了新的要求。然而，传统的聚偏二氟乙烯粘合剂由于其粘合性和电绝缘性不足，在制造高负载和厚电池电极时失败，更不用说用于柔性设备了。此外，有机加工昂贵且不环保。在此，作者报告了一种由碳纳米管交织在纤维素纳米片中制成的新型水性导电粘合剂，成功满足了为不同尺寸、形态和负到正工作电位的通用活性材料制造柔性但高强度的电极，具有高达≈ 90 mg cm -2 的高质量负载. 导电粘合剂具有超薄的 2D 网状纳米片结构，可在电极中形成连续的导电骨架，通过稳健的“面对点”粘合模式隔离和扭曲活性颗粒，使制造的电极具有卓越的柔韧性和出色的机械完整性，即使在各种外力和过度的电解液侵蚀下。作为案例研究，质量负载> 30 mg cm -2 的柔性 LCO 阴极表现出高机械强度 ( > 20 MPa)，并且可以轻松实现 12.1 mAh cm -2的超高面积容量。这种基于纤维素的粘合剂系统非常适用于先进的高性能功能设备，尤其是柔性和高能电池。
更新日期：2021-08-20
中文翻译：
一种用于柔性电极的通用水性导电粘合剂
可穿戴电子产品的发展对柔性和高能电池提出了新的要求。然而，传统的聚偏二氟乙烯粘合剂由于其粘合性和电绝缘性不足，在制造高负载和厚电池电极时失败，更不用说用于柔性设备了。此外，有机加工昂贵且不环保。在此，作者报告了一种由碳纳米管交织在纤维素纳米片中制成的新型水性导电粘合剂，成功满足了为不同尺寸、形态和负到正工作电位的通用活性材料制造柔性但高强度的电极，具有高达≈ 90 mg cm -2 的高质量负载. 导电粘合剂具有超薄的 2D 网状纳米片结构，可在电极中形成连续的导电骨架，通过稳健的“面对点”粘合模式隔离和扭曲活性颗粒，使制造的电极具有卓越的柔韧性和出色的机械完整性，即使在各种外力和过度的电解液侵蚀下。作为案例研究，质量负载> 30 mg cm -2 的柔性 LCO 阴极表现出高机械强度 ( > 20 MPa)，并且可以轻松实现 12.1 mAh cm -2的超高面积容量。这种基于纤维素的粘合剂系统非常适用于先进的高性能功能设备，尤其是柔性和高能电池。
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