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Recently, Professor Guo Hong’s team from the School of Materials and Energy of Yunnan University (International Joint Research Center for Advanced Energy Materials of Yunnan Province) took Yunnan University as the first communication unit and published in the internationally renowned journal Advanced Functional Materials (Journals included in the Nature Index, IF=16.
83) Announced the latest breakthrough development of new energy storage materials "Dual-Active-Center of Polyimide and Triazine Modified Atomic-Layer Covalent Organic Frameworks for High-Performance Li Storage"
.
Doctoral student Zhao Genfu is the first author of the paper, and Professor Guo Hong is the author of the communication
.
? As a high-performance energy storage device, lithium-ion batteries have been widely used in various mobile power sources and other renewable clean energy carriers
.
The development of high-performance and sustainable green electrode materials is critical to the development of lithium-ion batteries
.
Compared with traditional inorganic compounds, covalent organic framework (COF) is a kind of porous crystalline framework material with designable composition and structure, and strong stability.
The framework structure of its functional organic unit exhibits open ion and Electron transmission channels have appeared on the stage of electrochemical storage in recent years
.
As an ideal lithium storage electrode material, COF still has many problems to be solved urgently.
For example, the strong π-π interaction leads to low redox site utilization, which directly affects its reversible energy storage capacity
.
Therefore, how to accurately design the COF molecular structure of the atomic layer structure to realize the full excitation and utilization of the active lithium storage sites between or inside the material structure will open up new ideas for the application of COF materials in the field of energy storage
.
?? Figure 1 The preparation of the atomic layer structure of E-TP-COF and its application in the cycle performance of cathode batteries? Based on the above research status and the problems faced, the research group of Professor Guo Hong proposed for the first time that C=O and C=N are dual effective Atomic layer covalent organic framework (E-TP-COF) modified by redox sites and successfully applied to cathode materials for lithium-ion batteries
.
The research group is based on previous research (Hong Guo*, et.
al, ACS Energy Lett.
, 2020,1022; Hong Guo*, et.
al, Appl.
Catal.
B:Environ.
, 2019, 243; Hong Guo*, et.
al, Adv.
Funct.
Mater.
2018, 1707480; Hong Guo*, et.
al, Nano Energy 2018, 51), constructed a unique petal-like two-dimensional atomic layer covalent organic framework through molecular level design, with High electrochemical kinetics and structural stability
.
The experimental results show that the introduction of C=O and C=N dual active sites regulated by the atomic layer structure significantly enhances the electrochemical activity and capacity of COF as a positive electrode for lithium-ion batteries (Figure 1)
.
? The cluster-like TP-COF is peeled off by mechanical peeling to obtain an atomic layer (less layer) of E-TP-COF material.
When E-TP-COF is used as the positive electrode of a lithium ion battery, the temperature is 200 mA g-1 At current density, the high capacity of 96 mAh g-1 is maintained after 500 cycles, and the Coulombic efficiency is close to 100%.
The electrochemical performance of E-TP-COF material is better than other newly reported organic compounds in LIB
.
This work provides a new strategy for the development of advanced organic electrode materials for low-cost, long-lasting cycle stability, high-capacity and reversible rechargeable batteries
.
? The results of this paper have been awarded by the 973 Program, the National Natural Science Foundation of China, the Yunnan Provincial Department of Science and Technology-Yunnan University Joint Key Fund, the Provincial Advanced Energy Materials International Joint Research Center, the Provincial University All-Solid State Ion Battery Key Laboratory Project, and Yunnan University Outstanding Support from the Youth Program and the postgraduate research and innovation project of Yunnan University
.
83) Announced the latest breakthrough development of new energy storage materials "Dual-Active-Center of Polyimide and Triazine Modified Atomic-Layer Covalent Organic Frameworks for High-Performance Li Storage"
.
Doctoral student Zhao Genfu is the first author of the paper, and Professor Guo Hong is the author of the communication
.
? As a high-performance energy storage device, lithium-ion batteries have been widely used in various mobile power sources and other renewable clean energy carriers
.
The development of high-performance and sustainable green electrode materials is critical to the development of lithium-ion batteries
.
Compared with traditional inorganic compounds, covalent organic framework (COF) is a kind of porous crystalline framework material with designable composition and structure, and strong stability.
The framework structure of its functional organic unit exhibits open ion and Electron transmission channels have appeared on the stage of electrochemical storage in recent years
.
As an ideal lithium storage electrode material, COF still has many problems to be solved urgently.
For example, the strong π-π interaction leads to low redox site utilization, which directly affects its reversible energy storage capacity
.
Therefore, how to accurately design the COF molecular structure of the atomic layer structure to realize the full excitation and utilization of the active lithium storage sites between or inside the material structure will open up new ideas for the application of COF materials in the field of energy storage
.
?? Figure 1 The preparation of the atomic layer structure of E-TP-COF and its application in the cycle performance of cathode batteries? Based on the above research status and the problems faced, the research group of Professor Guo Hong proposed for the first time that C=O and C=N are dual effective Atomic layer covalent organic framework (E-TP-COF) modified by redox sites and successfully applied to cathode materials for lithium-ion batteries
.
The research group is based on previous research (Hong Guo*, et.
al, ACS Energy Lett.
, 2020,1022; Hong Guo*, et.
al, Appl.
Catal.
B:Environ.
, 2019, 243; Hong Guo*, et.
al, Adv.
Funct.
Mater.
2018, 1707480; Hong Guo*, et.
al, Nano Energy 2018, 51), constructed a unique petal-like two-dimensional atomic layer covalent organic framework through molecular level design, with High electrochemical kinetics and structural stability
.
The experimental results show that the introduction of C=O and C=N dual active sites regulated by the atomic layer structure significantly enhances the electrochemical activity and capacity of COF as a positive electrode for lithium-ion batteries (Figure 1)
.
? The cluster-like TP-COF is peeled off by mechanical peeling to obtain an atomic layer (less layer) of E-TP-COF material.
When E-TP-COF is used as the positive electrode of a lithium ion battery, the temperature is 200 mA g-1 At current density, the high capacity of 96 mAh g-1 is maintained after 500 cycles, and the Coulombic efficiency is close to 100%.
The electrochemical performance of E-TP-COF material is better than other newly reported organic compounds in LIB
.
This work provides a new strategy for the development of advanced organic electrode materials for low-cost, long-lasting cycle stability, high-capacity and reversible rechargeable batteries
.
? The results of this paper have been awarded by the 973 Program, the National Natural Science Foundation of China, the Yunnan Provincial Department of Science and Technology-Yunnan University Joint Key Fund, the Provincial Advanced Energy Materials International Joint Research Center, the Provincial University All-Solid State Ion Battery Key Laboratory Project, and Yunnan University Outstanding Support from the Youth Program and the postgraduate research and innovation project of Yunnan University
.