Lithium-ion batteries face ongoing challenges from upstart technologies, while concerns continue over their potential instability. The ultimate winner could be the contender offering the best blend of high energy density, fast charging, and longer lifespan. Scientists at Dongguk University in Korea, have developed a hybrid lithium-ion anode, that could tip the scales in lithium-ion’s direction.
Hybrid Lithium-Ion Anode Boosts Density and Lifespan
A heterostructure is a combination of two or more distinct materials, in a specific arrangement. In this instance, the Dongguk University built a hierarchical heterostructure.
This means they created successive layers of graphene oxide, and nickel-iron double hydroxides. This hybrid structure combined the high conductivity of graphene oxide, with faster charging nickel-iron layered double hydroxides.
However, the key to their ultimate success lay in their ability to optimize the material interfaces at the nanoscale level. Their hybrid lithium-ion anode considerably enhanced both energy storage capacity, and long-term cycling stability.
The team leader, Prof Jae-Min Oh, believes the key to better batteries lies in moving on from simply improving individual components. Instead, he believes, the answer lies in multiple interacting materials. We need combinations that create synergy, and lead to smaller, lighter, and more efficient batteries, he believes.
Testing and Proving the Performance of the New Anode
Anodes play a defining role in battery performance. They receive ions from the cathode while a battery is discharging, and dispatch electrons that power devices. This is how the ultimate performance of a battery depends on the efficiency of its anode.
In this particular instance, the Dongguk University lithium-ion battery anode performed well. It demonstrated high specific capacity, that was greater than conventional alternatives. It retained high capacity even after faster charging and discharging.
“This breakthrough was made possible through close cooperation between experts in diverse materials,” Prof Jae-Min Oh observes. “By combining our strengths, we were able to design and optimize this hybrid system more effectively.”
More Information
Silicon-Graphite Anodes – The Way Forward?
Anodes and Cathodes and Their Roles
Preview Image: Heterostructures for Enhanced Energy Storage
