A battery that can run 630 kilometers on a single charge

Last year alone, there were more than 100,000 newly registered electric vehicles (ev) in the country
.
Norway is the only country
on a par with this figure.
At present, the core material that determines the battery life and charging speed of the common electric vehicle is the anode material
.
The domestic battery industry has been committed to finding revolutionary ways
to improve battery capacity by introducing new technologies or other anode materials.
But what if we get rid of the anode material completely?

Professor Soojin Park of Pohang University of Technology and doctoral student in the Department of Chemistry Sungjin Cho collaborated with Professor Dong-Hwa Seo of the Ulsan Institute of Science and Technology (UNIST) and Dr.
Dong Yeon Kim to develop a lithium-free anodic battery
with long battery life on a single charge.

The newly developed anodeless battery has a capacity energy density of 977Wh/L, which is 40%
higher than that of conventional batteries (700wh/L).
This means that the battery can travel 630 kilometers on
a single charge.

Since lithium ions enter and exit the electrode during repeated charge and discharge, the battery usually changes the structure
of the anode material.
That's why battery capacity drops
over time.
It is believed that if the anode material is not used and only the bare anode collector is used to charge and discharge, then the energy density that determines the battery capacity increases
.
However, this method has a key weakness that leads to significant expansion of the anode volume and shortens the life cycle
of the battery.
It swells because there is no stable lithium storage space
in the anode.

To overcome this problem, the team successfully developed an anodeless battery
by adding an ionic conductive substrate to the commonly used carbonate-based liquid electrolyte.
The substrate not only forms an anode protective layer, but also helps to minimize the volume expansion
of the anode.

Studies have shown that the battery maintains a high capacity-2 high current density of ^4.
2 mA milliampere-2 in ^{carbonate-based} liquid electrolytes for a long time
.
It has also been theoretically and experimentally confirmed that the substrate can store lithium
.

What's more, more strikingly, is that the team successfully demonstrated that solid-state hemis use silver-based sulfide-based solid electrolytes
.
The battery can maintain high capacity for a long time and is expected to accelerate the commercialization
of non-explosive batteries.