A recent study by Lawrence Livermore National Laboratory has found that hydrogen can greatly increase the capacity and conductivity of lithium-ion batteries. Of course, this study can also pave the way for better storage media, including hydrogen itself. The new progress mainly revolves around combining lithium-ion battery graphene nano-foam anodes with hydrogen. Graphene materials have been widely used in industrial production, including energy storage devices such as lithium ion batteries.
Dr. Ye Jianchao (post-graduate / Jianchao Ye) and the improved lithium-ion battery at Lawrence Livermore National Laboratory (LLNL).
The most common is 3D graphene nanofoam, which you can find in many types of electrochemical storage media, including hydrogen tanks, super capacitors, energy sorbents, and lithium batteries.
In addition, it is also used in filtration, insulation, and desalination systems. Scientists believe that all of these applications will benefit from this new study and usher in varying degrees of improvement.
The 'Ye Jianchao' in operation and Morris Wang watched on the side.
Atomic hydrogen is a residue in the graphene production process, but its role in point storage applications is somewhat less well understood. It is well known that hydrogen adsorbents affect the structure of graphene. If it is not doped with hydrogen, it is theoretically a nonconductive insulator.
The goal of LLNL is to find out exactly how hydrogen and graphene are related in the production process, and how to manipulate and improve the quality of graphene used in storage media. The team's experiments involved processing graphene and hydrogen at low temperatures, which caused graphene to open up a small hole with hydrogen, allowing lithium to penetrate more easily.
In lithium-ion batteries, this improvement can not only increase their discharge power, but also enhance their absorptive capacity. In addition, overall capacity can be improved because lithium can be more easily confined to the edge of the graphene material.
Electrochemical properties of 3D GNFs.
LLNL scientist Brandon Wood said:
We have found a way to significantly increase the rated capacity of graphene nano-foam electrode materials through hydrogen treatment. After combining the experimental results with detailed simulations, we were able to track and refine this subtle interaction between defects and free hydrogen. This leads to some subtle changes in graphene chemistry and morphology, and confirms a huge and dramatic effect on performance.
However, the authors of the article also pointed out that their experiments did not answer some key questions, such as how to optimize the density of defects, and how to find the best combination of hydrogen and graphene materials in order to clearly achieve higher energy density of lithium-ion batteries. .
Further research plans will continue work in this area. Articles on this research have been published in the recent journal Nature Scientific Reports.
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