Superior electrochemical properties and high flexibility are two crucial requirements and challenges for electrochemical capacitors(ECs)applied in flexible and wearable electronics.Here a low-cost and scalable method ...Superior electrochemical properties and high flexibility are two crucial requirements and challenges for electrochemical capacitors(ECs)applied in flexible and wearable electronics.Here a low-cost and scalable method is proposed for the fabrication of mechanically exfoliated graphite paper(MEGP),which shows unique layered microstructures.The MEGP is subsequently used as a current collector to directly load multi-walled carbon nanotube@polypyrrole(MWCNT@PPy)core–shell hybrids as active materials,by electro-codeposition.The resultant MEGP/MWCNT@PPy electrodes demonstrate substantially enhanced electrochemical properties compared to GP/MWCNT@PPy,owing to the 3D interface constructed between layered MEGP and MWCNT@PPy.The symmetrical EC assembled using MEGP/MWCNT@PPy electrodes achieves an areal capacitance of 101.5 mF cm^(−2) at a current density of 0.5 mA cm^(−2),and an ideal rate capability.It also shows an electrochemical stability of 87.1%after 10000 cycles,and retains 95.1%of the initial capacitance after enduring harsh mechanical deformation 400 times.These results indicate that the EC device has superior electrochemical properties and high flexibility with great potential for utilization in flexible and wearable electronic devices.The MEGP we have developed not only ensures the high flexibility of the device,but also boosts its electrochemical performance.展开更多
Natural graphite is investigated as the cathode for aluminum ion batteries in recent years. However, some drawbacks of the natural graphite such as severe volume swelling shorten its lifetime, In this work, we prepare...Natural graphite is investigated as the cathode for aluminum ion batteries in recent years. However, some drawbacks of the natural graphite such as severe volume swelling shorten its lifetime, In this work, we prepared a composite material by depositing an amorphous carbon on the graphite paper, The composite was used as a cathode to study the electrochemical performance in aluminum ion batteries. The charge/discharge results showed that the composite could exhibit a longer cycle life than the graphite paper, Electrochemical analyses demonstrated that the interface between the amorphous carbon and the graphite paper made a major contribution to the improvement of the cycling stability.展开更多
The thin zinc anode in zinc-ion batteries offers the advantages of high energy density and low cost.However,issues such as uneven zinc stripping and dendrite growth significantly reduce the cycling life and safety of ...The thin zinc anode in zinc-ion batteries offers the advantages of high energy density and low cost.However,issues such as uneven zinc stripping and dendrite growth significantly reduce the cycling life and safety of the battery.To address this,this study proposes a novel zinc anode construction strategy based on a graphite paper substrate,which significantly improves the reversibility of zinc deposition/stripping by regulating the distribution of the interfacial electric field.Compared to traditional copper foil-based substrates(Cu foil@Zn),the zinc deposition layer formed on the graphite paper substrate exhibits a more uniform morphology and superior electrochemical performance.Experimental results show that the Gr paper@Zn anode surface presents a brighter metallic luster,with a mass reduction of approximately 16%compared to the Cu foil@Zn.SEM and XRD analyses confirm that the graphite paper substrate promotes the formation of a uniform and dense Zn(002)crystal face orientation deposition layer,while the Cu foil substrate forms a columnar crystal structure with Zn(101)orientation.Furthermore,the Zn||I_(2) full battery assembled with Gr paper@Zn retains 75.1%of its initial capacity after 10000 cycles at a high current rate of 10 C.The Zn||I_(2) large-area pouch battery maintains 81.2%of its capacity after 800 cycles at a current of 0.8 A.More importantly,the assembled Zn||I_(2) multilayer pouch battery delivers an Ah-level capacity(1.67 Ah)and maintains 89.9%of its capacity after 100 cycles.This work provides new interface engineering insights for the design of high-performance thin zinc anodes.展开更多
基金supported by the National Natural Science Foundation of China(21975147,21873058,21601113,and 21573138)the Fund for Shanxi“1331 Project”Key Innovative Research Team.
文摘Superior electrochemical properties and high flexibility are two crucial requirements and challenges for electrochemical capacitors(ECs)applied in flexible and wearable electronics.Here a low-cost and scalable method is proposed for the fabrication of mechanically exfoliated graphite paper(MEGP),which shows unique layered microstructures.The MEGP is subsequently used as a current collector to directly load multi-walled carbon nanotube@polypyrrole(MWCNT@PPy)core–shell hybrids as active materials,by electro-codeposition.The resultant MEGP/MWCNT@PPy electrodes demonstrate substantially enhanced electrochemical properties compared to GP/MWCNT@PPy,owing to the 3D interface constructed between layered MEGP and MWCNT@PPy.The symmetrical EC assembled using MEGP/MWCNT@PPy electrodes achieves an areal capacitance of 101.5 mF cm^(−2) at a current density of 0.5 mA cm^(−2),and an ideal rate capability.It also shows an electrochemical stability of 87.1%after 10000 cycles,and retains 95.1%of the initial capacitance after enduring harsh mechanical deformation 400 times.These results indicate that the EC device has superior electrochemical properties and high flexibility with great potential for utilization in flexible and wearable electronic devices.The MEGP we have developed not only ensures the high flexibility of the device,but also boosts its electrochemical performance.
文摘Natural graphite is investigated as the cathode for aluminum ion batteries in recent years. However, some drawbacks of the natural graphite such as severe volume swelling shorten its lifetime, In this work, we prepared a composite material by depositing an amorphous carbon on the graphite paper, The composite was used as a cathode to study the electrochemical performance in aluminum ion batteries. The charge/discharge results showed that the composite could exhibit a longer cycle life than the graphite paper, Electrochemical analyses demonstrated that the interface between the amorphous carbon and the graphite paper made a major contribution to the improvement of the cycling stability.
基金supported by the National Natural Science Foundation of China(Grant No.52322708)and(Grant No.52441702).
文摘The thin zinc anode in zinc-ion batteries offers the advantages of high energy density and low cost.However,issues such as uneven zinc stripping and dendrite growth significantly reduce the cycling life and safety of the battery.To address this,this study proposes a novel zinc anode construction strategy based on a graphite paper substrate,which significantly improves the reversibility of zinc deposition/stripping by regulating the distribution of the interfacial electric field.Compared to traditional copper foil-based substrates(Cu foil@Zn),the zinc deposition layer formed on the graphite paper substrate exhibits a more uniform morphology and superior electrochemical performance.Experimental results show that the Gr paper@Zn anode surface presents a brighter metallic luster,with a mass reduction of approximately 16%compared to the Cu foil@Zn.SEM and XRD analyses confirm that the graphite paper substrate promotes the formation of a uniform and dense Zn(002)crystal face orientation deposition layer,while the Cu foil substrate forms a columnar crystal structure with Zn(101)orientation.Furthermore,the Zn||I_(2) full battery assembled with Gr paper@Zn retains 75.1%of its initial capacity after 10000 cycles at a high current rate of 10 C.The Zn||I_(2) large-area pouch battery maintains 81.2%of its capacity after 800 cycles at a current of 0.8 A.More importantly,the assembled Zn||I_(2) multilayer pouch battery delivers an Ah-level capacity(1.67 Ah)and maintains 89.9%of its capacity after 100 cycles.This work provides new interface engineering insights for the design of high-performance thin zinc anodes.
