Liu Nannan, Liu Zeping, Li Jiyang, Ge Zhen, Fan Lishuang, Zhao Chenyang, Guo Zhikun, Chen Aosai, Lu Xingyuan, Zhang Yu, Zhang Naiqing, Zhang Xigui
School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, China.
Yangtze Dleta Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
ACS Appl Mater Interfaces. 2023 Nov 8;15(44):51170-51178. doi: 10.1021/acsami.3c11677. Epub 2023 Oct 30.
Many cathode materials store zinc ions based on the intercalation reaction mechanism in neutral aqueous Zn-ion batteries, and the structural design of the cathodes has been stuck in the curing mode by extending the ion diffusion channel. Here, we first develop halide ions to unlock the electrochemical activity of conversion-type BiO in aqueous Zn-ion batteries. Notably, the iodide ion shows the best performance compatibility with the BiO cathode. The electrochemical reaction mechanism studies show that iodide ions can be regarded as a redox medium to reduce the charge-transfer activation energy and motivate the conversion of BiO from Bi to Bi during the cycle. Unsurprising, the discharge-specific capacity can reach 436.8 mAh g at 0.5 A g and achieve a cyclic lifespan of 6000 cycles at a current density of 3 A g. The activation of the BiO conversion reaction by iodide ions is of great significance for broadening the research range of ZIB cathode materials.
在中性水系锌离子电池中，许多阴极材料基于嵌入反应机制存储锌离子，并且阴极的结构设计一直停留在通过扩展离子扩散通道的固化模式。在此，我们首次开发卤化物离子以释放水系锌离子电池中转化型BiO的电化学活性。值得注意的是，碘离子与BiO阴极表现出最佳的性能兼容性。电化学反应机理研究表明，碘离子可被视为一种氧化还原介质，以降低电荷转移活化能，并在循环过程中促使BiO从Bi转化为Bi。不出所料，在0.5 A g时放电比容量可达436.8 mAh g，在3 A g的电流密度下实现6000次循环的循环寿命。碘离子对BiO转化反应的活化对于拓宽水系锌离子电池阴极材料的研究范围具有重要意义。
