苏州大学彭扬团队通过导电聚合物填充金属-有机框架中的“区块链”协同效应,用于具有高库仑效率的无枝晶锂电镀/剥离。相关研究成果于2022年1月5日发表在《德国应用化学》杂志上。
金属锂电池的性能受到金属阳极上不可控的枝晶生长和体积膨胀的严重影响。
受数据挖掘中“区块链”概念的启发,研究人员利用导电聚合物填充金属有机框架(MOF)作为锂主体,其中聚吡咯(PPy)作为“链”,将存储在MOF孔隙中的锂“区块”链接起来。富氮聚吡咯引导快速锂离子渗透/挤出,并作为各向同性锂生长的成核点,而MOF孔将大块锂沉积划分为3D矩阵锂存储,提供低势垒和无枝晶锂电镀/剥离,具有优异的库仑效率。在对称电池中,所制备的锂金属阳极在5 mA cm-2下运行700次,在全电池中在1 C下运行800次,每循环容量损失仅为0.017%。
该工作通过引入锂电镀/剥离的“区块链”管理概念,可能为锂金属阳极的构建打开新的篇章。
附:英文原文
Title: A “Blockchain” Synergy in Conductive Polymer-filled Metal–Organic Frameworks for Dendrite-free Li Plating/Stripping with High Coulombic Efficiency
Author: Yong Ma, Le Wei, Ying He, Xuzhou Yuan, Yanhui Su, Yuting Gu, Xinjian Li, Xiaohui Zhao, Yongze Qin, Qiaoqiao Mu, Yang Peng, Yang Sun, Zhao Deng
Issue&Volume: 2022-01-05
Abstract: The performance of lithium metal batteries is severely hampered by uncontrollable dendrite growth and volume expansion on the metal anodes. Inspired by the “blockchain” concept in data mining, here we utilize a conductive polymer-filled metal organic framework (MOF) as the lithium host, in which polypyrrole (PPy) serves as the “chain” to interlink Li “blocks” stored in the MOF pores. While the N-rich PPy guides fast Li + infiltration/extrusion and serves as the nucleation sites for isotropic Li growth, the MOF pores compartmentalize bulk Li deposition for 3D matrix Li storage, lending low-barrier and dendrite-free Li plating/stripping with superb Coulombic efficiency. The as-fabricated lithium metal anodes operate over 700 cycles at 5 mA cm -2 in symmetric cells, and 800 cycles at 1 C in full cells with a per-cycle capacity loss of only 0.017%. This work might open a new chapter for Li metal anode construction by introducing the concept of “blockchain” management of Li plating/stripping.
DOI: 10.1002/anie.202116291
Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202116291
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