材料科学
碳纳米管
纳米技术
复合材料
焊接
聚丙烯腈
涂层
电导率
纳米材料
水溶液
化学工程
电极
电解质
聚合物
物理化学
工程类
化学
作者
Yonggang Yao,Feng Jiang,Changping Yang,Kun Fu,John Hayden,Chuan‐Fu Lin,Liangbing Hu,Menggai Jiao,Chunpeng Yang,Yilin Wang,Shuaiming He,Fujun Xu,Emily Hitz,Tingting Gao,Jiaqi Dai,Wei Luo,Gary W. Rubloff,Chunsheng Wang,Liangbing Hu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2018-05-14
卷期号:12 (6): 5266-5273
被引量:52
标识
DOI:10.1021/acsnano.7b08584
摘要
Carbon nanomaterials are desirable candidates for lightweight, highly conductive, and corrosion-resistant current collectors. However, a key obstacle is their weak interconnection between adjacent nanostructures, which renders orders of magnitude lower electrical conductivity and mechanical strength in the bulk assemblies. Here we report an “epitaxial welding” strategy to engineer carbon nanotubes (CNTs) into highly crystalline and interconnected structures. Solution-based polyacrylonitrile was conformally coated on CNTs as “nanoglue” to physically join CNTs into a network, followed by a rapid high-temperature annealing (>2800 K, overall ∼30 min) to graphitize the polymer coating into crystalline layers that also bridge the adjacent CNTs to form an interconnected structure. The contact-welded CNTs (W-CNTs) exhibit both a high conductivity (∼1500 S/cm) and a high tensile strength (∼120 MPa), which are 5 and 20 times higher than the unwelded CNTs, respectively. In addition, the W-CNTs display chemical and electrochemical stabilities in strong acidic/alkaline electrolytes (>6 mol/L) when potentiostatically stressing at both cathodic and anodic potentials. With these exceptional properties, the W-CNT films are optimal as high-performance current collectors and were demonstrated in the state-of-the-art aqueous battery using a “water-in-salt” electrolyte.
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