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Join hydrogen can extend lithium battery endurance?
US Lawrence Livermore National Laboratory (LLNL) researchers found that adding hydrogen as long as the lithium ion battery electrodes, can significantly increase the battery capacity to extend the operating time and accelerated transmission job.
Lithium-ion battery is a rechargeable battery type, during discharge in lithium-ion battery from the positive and negative move, and then the positive electrode during charging of a lithium ion moves back negative.
Lithium-ion batteries have several key characteristics - capacity, voltage and energy density, the final performance of these properties by the combination of lithium ion and the electrode material to decide. Subtle changes in the structure, chemistry and shape of the electrode, may significantly affect the extent of its lithium-ion how strongly bonded.
Through experiment and calculation, Livermore National Laboratory researchers who found protection in lithium ion batteries, graphene nano bubble hydrogen electrode after treatment showed higher capacity and faster data transfer capability.
"These findings provide a qualitative analysis point of view, contribute to the design of high-power electrode graphene-based materials," LLNL materials scientist Morris Wang expressed. He is also one of the study published in (Nature Scientific Reports) journals OF NATURAL SCIENCES "report."
Graphene material is stored in the energy component of commercial applications, including lithium-ion battery and a supercapacitor, seriously affecting their capacity to low cost mass production of such material. The usual methods of chemical synthesis will eventually leave a large amount of hydrogen atoms, it is for the electrochemical properties of graphene is also difficult to determine the effect caused.
Computational experiments with multi-dimensional Livermore Lab researchers found that the use of hydrogen-rich grain boundary defects deliberately for graphene bottom-temperature treatment, can actually increase the rate of capacity. Hydrogen and defects in graphene interaction opened after the smaller pores, the lithium ion can promote a more permeable, so as to enhance the transmission rate. By increasing the edge (most likely hydrogen attached to it) attached lithium ion can be recycled to provide more capacity.
"Electrode performance improvement is an important breakthrough, it is possible to open more real-world applications," said postdoctoral researcher Livermore Lab's Materials Sciences Sector cum lead author of the research paper Jianchao Ye representation.
In order to study the role of hydrogen and hydride defects in lithium ion storage properties of graphene, the researchers applied different heat treatment conditions combined with hydrogen exposure, focus its 3D graphene nano-foam (GNF) electrochemical properties, mainly the graphene defect-rich composition. The researchers used 3D graphene nano bubble since it has many potential applications, including hydrogen storage, catalysis, filtration, insulation, energy absorption, desalting capacitors, super capacitors and lithium ion batteries.
Graphene 3D foam can make non-stick properties will not become more complicated because of the additive, which can be an ideal choice mechanism studies.
"We found that after hydrogen treatment, graphene nano-foam electrodes have significant progress. By combining this experiment combined with detailed simulations, we will be able to track the progress of the subtle interaction with defects and hydrogen dissociation between in response graphene chemistry and morphology of some small changes brought about by the results, and finally it could have a tremendous impact amazing in terms of performance, "LLNL researchers also another author of the study indicate Brandon Wood.
According to the study results show that hydrogen can control this process can also be used for other graphene-based anode material, the best lithium-ion transmission and storage applications can be recycled.
Lithium-ion battery is a rechargeable battery type, during discharge in lithium-ion battery from the positive and negative move, and then the positive electrode during charging of a lithium ion moves back negative.
Lithium-ion batteries have several key characteristics - capacity, voltage and energy density, the final performance of these properties by the combination of lithium ion and the electrode material to decide. Subtle changes in the structure, chemistry and shape of the electrode, may significantly affect the extent of its lithium-ion how strongly bonded.
Through experiment and calculation, Livermore National Laboratory researchers who found protection in lithium ion batteries, graphene nano bubble hydrogen electrode after treatment showed higher capacity and faster data transfer capability.
"These findings provide a qualitative analysis point of view, contribute to the design of high-power electrode graphene-based materials," LLNL materials scientist Morris Wang expressed. He is also one of the study published in (Nature Scientific Reports) journals OF NATURAL SCIENCES "report."
Graphene material is stored in the energy component of commercial applications, including lithium-ion battery and a supercapacitor, seriously affecting their capacity to low cost mass production of such material. The usual methods of chemical synthesis will eventually leave a large amount of hydrogen atoms, it is for the electrochemical properties of graphene is also difficult to determine the effect caused.
Computational experiments with multi-dimensional Livermore Lab researchers found that the use of hydrogen-rich grain boundary defects deliberately for graphene bottom-temperature treatment, can actually increase the rate of capacity. Hydrogen and defects in graphene interaction opened after the smaller pores, the lithium ion can promote a more permeable, so as to enhance the transmission rate. By increasing the edge (most likely hydrogen attached to it) attached lithium ion can be recycled to provide more capacity.
"Electrode performance improvement is an important breakthrough, it is possible to open more real-world applications," said postdoctoral researcher Livermore Lab's Materials Sciences Sector cum lead author of the research paper Jianchao Ye representation.
In order to study the role of hydrogen and hydride defects in lithium ion storage properties of graphene, the researchers applied different heat treatment conditions combined with hydrogen exposure, focus its 3D graphene nano-foam (GNF) electrochemical properties, mainly the graphene defect-rich composition. The researchers used 3D graphene nano bubble since it has many potential applications, including hydrogen storage, catalysis, filtration, insulation, energy absorption, desalting capacitors, super capacitors and lithium ion batteries.
Graphene 3D foam can make non-stick properties will not become more complicated because of the additive, which can be an ideal choice mechanism studies.
"We found that after hydrogen treatment, graphene nano-foam electrodes have significant progress. By combining this experiment combined with detailed simulations, we will be able to track the progress of the subtle interaction with defects and hydrogen dissociation between in response graphene chemistry and morphology of some small changes brought about by the results, and finally it could have a tremendous impact amazing in terms of performance, "LLNL researchers also another author of the study indicate Brandon Wood.
According to the study results show that hydrogen can control this process can also be used for other graphene-based anode material, the best lithium-ion transmission and storage applications can be recycled.