Constructing Donor–Acceptor‑Linked COFs Electrolytes to Regulate Electron Density and Accelerate the Li^(+)Migration in Quasi‑Solid‑State BatteryOA
Regulation the electronic density of solid-state electrolyte by donor–acceptor(D–A)system can achieve highly-selective Li^(+)transportation and conduction in solid-state Li metal batteries.This study reports a high-performance solid-state electrolyte thorough D–A-linked covalent organic frameworks(COFs)based on intramolecular charge transfer interactions.Unlike other reported COFbased solid-state electrolyte,the developed concept with D–A-linked COFs not only achieves electronic modulation to promote highly-selective Li^(+)migration and inhibit Li dendrite,but also offers a crucial opportunity to understand the role of electronic density in solid-state Li metal batteries.The introduced strong electronegativity F-based ligand in COF electrolyte results in highlyselective Li^(+)(transference number 0.83),high ionic conductivity(6.7×10^(-4)S cm^(−1)),excellent cyclic ability(1000 h)in Li metal symmetric cell and high-capacity retention in Li/LiFePO_(4)cell(90.8%for 300 cycles at 5C)than substituted C-and N-based ligands.This is ascribed to outstanding D–A interaction between donor porphyrin and acceptor F atoms,which effectively expedites electron transferring from porphyrin to F-based ligand and enhances Li^(+)kinetics.Consequently,we anticipate that this work creates insight into the strategy for accelerating Li^(+)conduction in high-performance solid-state Li metal batteries through D–A system.
Genfu Zhao;Hang Ma;Conghui Zhang;Yongxin Yang;Shuyuan Yu;Haiye Zhu;Yongjiang Sun;Hong Guo
School of Materials and Energy,International Joint Research Center for Advanced Energy Materials of Yunnan Province,Yunnan University,Kunming 650091,People’s Republic of ChinaYunnan Yuntianhua Co.,Ltd,R&D Center,Kunming 650228,People’s Republic of ChinaSchool of Materials and Energy,International Joint Research Center for Advanced Energy Materials of Yunnan Province,Yunnan University,Kunming 650091,People’s Republic of ChinaSchool of Materials and Energy,International Joint Research Center for Advanced Energy Materials of Yunnan Province,Yunnan University,Kunming 650091,People’s Republic of ChinaSchool of Materials and Energy,International Joint Research Center for Advanced Energy Materials of Yunnan Province,Yunnan University,Kunming 650091,People’s Republic of ChinaSchool of Materials and Energy,International Joint Research Center for Advanced Energy Materials of Yunnan Province,Yunnan University,Kunming 650091,People’s Republic of ChinaSchool of Materials and Energy,International Joint Research Center for Advanced Energy Materials of Yunnan Province,Yunnan University,Kunming 650091,People’s Republic of ChinaSchool of Materials and Energy,International Joint Research Center for Advanced Energy Materials of Yunnan Province,Yunnan University,Kunming 650091,People’s Republic of China Southwest United Graduate School,Kunming 650091,People’s Republic of China
动力与电气工程
Electronic modulation engineeringDonor-acceptor-linked covalent organic frameworksQuasi-solid-state Li metal battery
《Nano-Micro Letters》 2025 (1)
P.456-471,16
financial support provided by National Natural Science Foundation of China(52303283,52372232,52064049)the Major Science and Technology Projects of Yunnan Province(202302AB080019-3)National Natural Science Foundation of Yunnan Province(202301AS070040,202401AU070201)the Analysis and Measurements Center of Yunnan University for the sample testing servicethe Electron Microscope Center of Yunnan University for the support of this work.
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