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耐久性水性锌离子电池碳骨架中ZnMn2O4量子点的合理设计
作者:小柯机器人 发布时间:2022/1/14 15:17:05

南开大学Zhiqiang Niu研究小组在研究中取得进展。他们提出了耐久锌离子水性电池碳骨架中ZnMn2O4量子点的合理设计。相关论文发表在2022年1月6日出版的《德国应用化学》杂志上。

研究人员采用原位电化学诱导Mn-MIL-100衍生的Mn3O4量子点与碳复合材料,将ZnMn2O4量子点(ZMO QDs)引入多孔碳骨架中。在这种ZMO量子点和碳的复合材料中,量子点结构赋予ZnMn2O4更短的离子扩散路径和更多的Zn 2+活性位点,而高导电性的碳骨架有利于电子的快速传输。更重要的是,在ZMO量子点与碳基体的界面上形成了Mn-O-C键,能有效抑制Jahn-Teller效应和放电产物的锰溶解。因此,Zn/ZMO QD@C电池的电化学性能得到了显著提高。

据介绍,锰氧化物具有能量密度高、成本低的优点,是一种很有前途的水性锌离子电池(ZIB)正极材料。然而,在其放电过程中,由于Jahn-Teller效应和Mn3+的歧化反应往往导致不可逆的结构转变和Mn2+的溶解,使ZIB的循环稳定性恶化。

附:英文原文

Title: Rational Design of ZnMn2O4 Quantum Dots in Carbon Framework for Durable Aqueous Zinc-Ion Batteries

Author: Shenzhen Deng, Zhiwei Tie, Fang Yue, Hongmei Cao, Minjie Yao, Zhiqiang Niu

Issue&Volume: 2022-01-06

Abstract: Manganese oxides are promising cathode materials for aqueous zinc-ion batteries (ZIBs) due to their high energy density and low cost. However, in their discharging processes, the Jahn-Teller effect and Mn  3+  disproportionation often lead to irreversible structural transformation and Mn  2+  dissolution, deteriorating the cycling stability of ZIBs. Herein, ZnMn  2  O  4  quantum dots (ZMO QDs) were introduced into porous carbon framework by  in-situ  electrochemically inducing Mn-MIL-100-derived Mn  3  O  4  quantum dots and carbon composite. In such ZMO QDs and carbon composite, the quantum dot structure endows ZnMn  2  O  4  with shorter ion diffusion route and more active sites for Zn  2+  . The highly conductive carbon framework is beneficial to the fast transport of electrons. Furthermore, at the interface between ZMO QDs and carbon matrix, the Mn-O-C bonds are formed. They can effectively suppress Jahn-Teller effect and manganese dissolution of discharge products. Therefore, Zn/ZMO QD@C batteries display remarkably enhanced electrochemical performance.

DOI: 10.1002/anie.202115877

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202115877

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