Luo Ping, Yu Gongtao, Zhang Wenwei, Tang Han, Zhu Dongyao, Chao Feiyang, Zhong Wenhui, Dong Shijie, An Qinyou
Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Hubei Provincial Key Laboratory of Green Materials for Light Industry, New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base, Hubei Engineering Laboratory of Automotive Lightweight Materials and Processing, School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, PR China; Hubei Longzhong Laboratory, Hubei University of Technology, 441000 Xiangyang, Hubei, PR China.
Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Hubei Provincial Key Laboratory of Green Materials for Light Industry, New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base, Hubei Engineering Laboratory of Automotive Lightweight Materials and Processing, School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, PR China.
J Colloid Interface Sci. 2024 Apr;659:267-275. doi: 10.1016/j.jcis.2023.12.167. Epub 2023 Dec 30.
Vanadium-based materials are widely recognized as the primary candidate cathode materials for aqueous Zn-ion batteries (AZIBs). However, slow kinetics and poor stability pose significant challenges for widespread application. Herein, to address these issues, alkali metal ions and polyaniline (PANI) are introduced into layered hydrated VO (VO). Density functional theory calculations reveal that the synthesized (CHNH)KVO·0.92HO (KPVO), with K and PANI co-intercalation, exhibits a robust interlayer structure and a continuous three-dimensional (3D) electron transfer network. These properties facilitate the reversible diffusion of Zn with a low migration potential barrier and rapid response kinetics. The KPVO cathode exhibits a discharge specific capacity of 418.3 mAh/g at 100 mA/g and excellent cycling stability with 89.5 % retention after 3000 cycles at 5 A/g. This work provides a general strategy for integrating cathode materials to achieve high specific capacity and excellent kinetic performance.
钒基材料被广泛认为是水系锌离子电池（AZIBs）的主要候选正极材料。然而，缓慢的动力学和较差的稳定性对其广泛应用构成了重大挑战。在此，为了解决这些问题，将碱金属离子和聚苯胺（PANI）引入层状水合VO（VO）中。密度泛函理论计算表明，合成的（CHNH）KVO·0.92HO（KPVO），由于K和PANI的共嵌入，具有坚固的层间结构和连续的三维（3D）电子转移网络。这些特性有助于锌的可逆扩散，具有低迁移势垒和快速响应动力学。KPVO正极在100 mA/g时的放电比容量为418.3 mAh/g，并且具有出色的循环稳定性，在5 A/g下循环3000次后保留率为89.5%。这项工作为整合正极材料以实现高比容量和出色的动力学性能提供了一种通用策略。
