Research Article


In situ separator modification via CVD-derived N-doped carbon for highly reversible Zn metal anodes

Xianzhong Yang1, Weiping Li1, Jiaze Lv1, Guojie Sun1, Zixiong Shi1, Yiwen Su1, Xueyu Lian1,2, Yanyan Shao1, Aomiao Zhi3, Xuezeng Tian3, Xuedong Bai3, Zhongfan Liu1,2,4 (✉), and Jingyu Sun1,2 (✉)

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1 College of Energy, Soochow Institute for Energy and Materials Innovations (SIEMIS), Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Soochow University, Suzhou 215006, China
2 Beijing Graphene Institute (BGI), Beijing 100095, China
3 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4 Center for Nanochemistry (CNC), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Keywords: N-doped carbon, glass fiber, separator modification, plasma-enhanced chemical vapor deposition (PECVD), Zn metal anode
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Attention toward aqueous zinc-ion battery has soared recently due to its operation safety and environmental benignity. Nonetheless, dendrite formation and side reactions occurred at the anode side greatly hinder its practical application. Herein, we adopt direct plasma-enhanced chemical vapor deposition strategy to in situ grow N-doped carbon (NC) over commercial glass fiber separator targeting a highly stabilized Zn anode. The strong zincophilicity of such a new separator would reduce the nucleation overpotential of Zn and enhance the Zn-ion transference number, thereby alleviating side reactions. Symmetric cells equipped with NC-modified separator harvest a stable cycling for more than 1,100 h under 1 mA·cm−2/1 mAh·cm−2. With the assistance of NC, the depth of discharge of Zn anode reaches as high as 42.7%. When assembled into full cells, the zinc-ion battery based on NC-modified separator could maintain 79% of its initial capacity (251 mAh·g−1) at 5 A·g−1 after 1,000 cycles.
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In situ separator modification via CVD-derived N-doped carbon for highly reversible Zn metal anodes. Nano Res.

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