A recent study by Lawrence Livermore National Laboratory has found that hydrogen can greatly enhance the capacity and conductivity of lithium-ion batteries. Of course, this research can also pave the way for better storage media, including hydrogen itself. The new progress mainly around the lithium-ion battery graphene nano-foam anode and hydrogen combine. Graphene materials in industrial production has been widely used, including lithium-ion batteries and other energy storage devices.
Lawrence Livermore National Laboratory (LLNL) postdoctoral Ye Jianchao (Jianshu Ye) and improved lithium-ion battery
The most common are 3D graphene nanobubbles, which you can find on many types of electrochemical storage media, including hydrogen canisters, supercapacitors, energy sorbents, and lithium batteries.
In addition, it is also used for filtration, insulation, and desalination systems. Scientists believe that all of these applications will benefit from this new study and will see some degree of improvement.
Ye Jianchao in action with Morris Wang on the sidelines
Atomic hydrogen is a residue in the production of graphene, but its role in point-storage applications is somewhat less well understood. It is well known that hydrogen adsorbents can affect the structure of graphene. Without hydrogen doping, it is theoretically a non-conductive insulator.
The goal of LLNL is to find out exactly what the relationship between hydrogen and graphene is in the production process and how to manipulate and improve the quality of graphene used in storage media. The team's experiment involved treating graphene with hydrogen at low temperatures, which led to the opening of graphene with a small hole in hydrogen that allows lithium to penetrate more easily.
In lithium-ion batteries, this improvement can not only enhance its discharge power, but also enhance its absorption capacity. In addition, because lithium can be more easily confined to the edge of graphene materials, the overall capacity will be improved.
Electrochemical properties of 3D GNFs
LLNL scientist Brandon Wood said:
We found a way to dramatically improve the nominal capacity of the graphene nanofoam electrode material by hydrogen treatment. After combining the experimental results with detailed simulations, we were able to track improvements in this subtle interaction between defects and free hydrogen. This leads to some subtle changes in the chemistry and morphology of graphene and confirms the huge and dramatic impact on performance.
However, the authors also pointed out that their experiment 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 allow lithium-ion batteries to achieve higher energy density .
Further research projects will continue in this area and articles on the study have been published in the recent issue of Nature Scientific Reports.
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