A lean-zinc anode battery based on metal-organic framework-derived carbon  

作　　者：Chao Li Liheng Liang Xuhui Liu Ning Cao Qingguo Shao Peichao Zou Xiaobei Zang 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao,China [2]Department of Physics and Astronomy,University of California,California,Irvine,USA

出　　处：《Carbon Energy》2023年第4期105-118,共14页碳能源（英文）

基　　金：State Key Laboratory of Heavy Oil Processing,Grant/Award Number:SKLHOP202101006;National Natural Science Foundation of China,Grant/Award Numbers:21905304,52073305;Natural Science Foundation of Shandong Province,Grant/Award Number:ZR2020QE048。

摘　　要：Improving zinc metal(Zn^(0))reversibility and minimizing the N/P ratio are critical to boosting the energy density of Zn^(0) batteries.However,in reality,an excess Zn source is usually adopted to offset the irreversible zinc loss and guarantee sufficient zinc cycling,which sacrifices the energy density and leads to poor practicability of Zn^(0) batteries.To address the above conundrum,here,we report a lean-Zn and hierarchical anode based on metal-organic framework(MOF)-derived carbon,where trace Zn^(0) is pre-reserved within the anode structure to make up for any irreversible zinc source loss.This allows us to construct low N/P ratio Zn^(0) full cells when coupling the lean-Zn anode with Zn-containing cathodes.Impressively,high Zn^(0) reversibility(average Coulombic efficiency of 99.4% for 3000 cycles)and long full-cell lifetime(92% capacity retention after 900 cycles)were realized even under the harsh lean-Zn condition(N/P ratio:1.34).The excellent Zn reversibility is attributed to the hierarchy structure that homogenizes zinc ion flux and electric field distribution,as confirmed by theoretical simulations,which therefore stabilizes Zn^(0) evolution.The lean-Zn anode design strategy will provide new insights into construction of high-energy Zn^(0) batteries for practical applications.

关 键 词：Coulombic efficiency hierarchy structure lean-Zn anode MOF-5-derived carbon 

分 类 号：TM912[电气工程—电力电子与电力传动]