A mild, configurable, flexible CoNi-LDH(v)/Zn battery based on H-vacancy-induced reversible Zn^(2+) intercalation  

作　　者：Xinyue Cheng Dingsheng Wu Hao Gao Qingqing Wang Pengfei Lv Sam S.Yoon Qufu Wei 

机构地区：[1]Key Laboratory of Eco–textiles,Ministry of Education,Jiangnan University,Wuxi 214122,Jiangsu,China School of Mechanical Engineering,Korea University,Seoul 136–713,Republic of Korea Received 12 August 2024,Revis

出　　处：《Journal of Energy Chemistry》2025年第1期498-508,共11页能源化学(英文版)

基　　金：National Natural Science Foundation of China (52003191,5247317, 52473275);Young Elite Scientists Sponsorship Program by CAST (2022QNRC001);Natural Science Foundation of Jiangsu Province (BK20221539);Postgraduate Research&Practice Innovation Program of Jiangsu Province (KYCX22_2341);Program of Introducing Talents of Jiangnan University (1065219032210150);Program of China Scholarship Council (202306790065)。

摘　　要：Flexible Zn-based batteries have attracted increasing research interest as essential components of wearable energy storage devices.However,the advancement of flexible aqueous Zn-based batteries based on Co-Ni layered double hydroxide (CoNi-LDH) as the cathode material is hampered by their poor cycling stability and the corrosiveness of alkaline electrolytes.Herein,CoNi-LDH nanosheets enriched with H vacancies (CoNi-LDH(v)) were constructed on a flexible carbon cloth (CC) substrate via electrochemical deposition and activation.The Zn-based battery comprising CoNi-LDH(v)@CC as the cathode exhibited highly reversible conversion reactions and stable operation in 3 M ZnSO4electrolyte (pH=4).The battery delivered an excellent specific capacity (225 mA h g^(-1),0.26 mA h cm^(-2)),acceptable cycling stability(53.9%,900 cycles),and high discharging voltage.The abundant H vacancies served as active sites for the reversible intercalation of Zn^(2+)and the extravasation of NO_(3)-generated channels and space for Zn^(2+)transport and storage,together enabling an excellent Zn^(2+)storage capacity.Furthermore,a sandwich-structured solid-state CoNi-LDH(v)@CC//Zn@CC battery was fabricated and was found to exhibit a noteworthy electrochemical performance and mechanical durability.As a proof of concept,the unencapsulated battery powered a digital watch under various deformation conditions and operated stably for 80 h.Additionally,the flexible battery displayed outstanding customizability,maintaining an open-circuit voltage of 1.42 V even after being cut twice.The proposed engineering strategy contributes to the realization of textiles with truly wearable energy-storage devices.

关 键 词：CoNi/Zn battery H vacancies Mild aqueous electrolyte Tailorable battery Wearable energy storage device 

分 类 号：TM9[电气工程—电力电子与电力传动]