Crystallinity engineering of carbon nitride protective coating for ultra-stable Zn metal anodes  

作　　者：Chen Liu Yuxin Zhu Shuanlong Di Jiarui He Ping Niu Antonios Kelarakis Marta Krysmann Shulan Wang Li Li 

机构地区：[1]School of Metallurgy,Northeastern University,Shenyang,China [2]State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang,China [3]Foshan Graduate School of Innovation,Northeastern University,Foshan,China [4]Department of Chemistry,College of Science,Northeastern University,Shenyang,China [5]UCLan Research Centre for Smart Materials,School of Natural Sciences,University of Central Lancashire,Preston,UK [6]School of Dentistry,University of Central Lancashire,Preston,UK

出　　处：《Electron》2024年第1期177-187,共11页电子（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Number:22378055;Applied Basic Research Program of Liaoning,Grant/Award Number:2022JH2/101300200;Guangdong Basic and Applied Basic Research Foundation,Grant/Award Number:2022A1515140188;Fundamental Research Funds for the Central Universities,Grant/Award Numbers:N2002005,N2125004,N2225044,N232410019。

摘　　要：Ineffective control of dendrite growth and side reactions on Zn anodes significantly retards commercialization of aqueous Zn-ion batteries.Unlike conventional interfacial modification strategies that are primarily focused on component optimization or microstructural tuning,herein,we propose a crystallinity engineering strategy by developing highly crystalline carbon nitride protective layers for Zn anodes through molten salt treatment.Interestingly,the highly ordered structure along with sufficient functional polar groups and pre-intercalated Kþendows the coating with high ionic conductivity,strong hydrophilicity,and accelerated ion diffusion kinetics.Theoretical calculations also confirm its enhanced Zn adsorption capability compared to commonly reported carbon nitride with amorphous or semi-crystalline structure and bare Zn.Benefiting from the aforementioned features,the as-synthesized protective layer enables a calendar lifespan of symmetric cells for 1100 h and outstanding stability of full cells with capacity retention of 91.5%after 1500 cycles.This work proposes a new conceptual strategy for Zn anode protection.

关 键 词：crystalline carbon nitride crystallinity engineering long cycling life uniform Zn deposition Zn metal anode 

分 类 号：TM912[电气工程—电力电子与电力传动] TG146[一般工业技术—材料科学与工程]