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通过操纵OH-介导的阴阳极交流实现长寿命水基锌-钒电池
作者:小柯机器人 发布时间:2022/11/29 22:40:10

广东工业大学Cheng Chao Li团队近日取得一项新成果,他们通过操纵OH-介导的阴阳极交流实现了长寿命的水基锌-钒电池。这一研究成果发表在2022年11月27日出版的国际学术期刊《德国应用化学》上。

阳极-阴极相互作用是引发水基锌离子电池(AZIBs)降解的一个重要但很少被人考虑的因素。在该研究中,为了解决钒基AZIB循环性有限的问题,团队提出使用Al2(SO4)3作为处理OH-介导的Zn阳极与NaV3O8·1.5 H2O (NVO)阴极之间交流的电解质添加剂。

研究人员发现,Al3+的水解产生了pH≈0.9的强酸性环境,这出人意料地将阳极寿命从200小时延长到1000小时。这种显著的改善归因于Al3+吸附和固体电解质间相形成导致的界面OH-积累。相应地,电解液的强酸化以及随之而来的阳极OH-向NVO方向的迁移被抑制,明显减轻了电极令人不悦的溶解和相变。被打断的两个电极之间的OH-介导的交流使得Zn||NVO电池在低和高扫描速率下都具有极好的循环稳定性。

附:英文原文

Title: Manipulating OH?-Mediated Anode-Cathode Cross-Communication Toward Long-Life Aqueous Zinc-Vanadium Batteries

Author: Dao-Sheng Liu, Zhaoyu Zhang, Yufei Zhang, Minghui Ye, Song Huang, Shunzhang You, Zijian Du, Jiangfeng He, Zhipeng Wen, Yongchao Tang, Xiaoqing Liu, Cheng Chao Li

Issue&Volume: 2022-11-27

Abstract: The anode-cathode interplay is an important but rarely considered factor that initiates the degradation of aqueous zinc ion batteries (AZIBs). Herein, to address the limited cyclability issue of V-based AZIBs, Al2(SO4)3 is proposed as decent electrolyte additive to manipulate OH-mediated cross-communication between Zn anode and NaV3O8·1.5H2O (NVO) cathode. The hydrolysis of Al3+ creates a pH≈0.9 strong acidic environment, which unexpectedly prolongs the anode lifespan from 200 to 1000 h. Such impressive improvement is assigned to the alleviation of interfacial OH accumulation by Al3+ adsorption and solid electrolyte interphase formation. Accordingly, the strongly acidified electrolyte, associated with the sedated crossover of anodic OH toward NVO, remarkably mitigate its undesired dissolution and phase transition. The interrupted OH-mediated communication between the two electrodes endows Zn||NVO batteries with superb cycling stability, at both low and high scan rates.

DOI: 10.1002/anie.202215385

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202215385

期刊信息

Angewandte Chemie:《德国应用化学》,创刊于1887年。隶属于德国化学会,最新IF:12.959
官方网址:https://onlinelibrary.wiley.com/journal/15213773
投稿链接:https://www.editorialmanager.com/anie/default.aspx