Lithium battery protection board testing equipment: advantages of new lithium metal batteries

With the widespread adoption of new energy vehicles, the demand for power batteries is also increasing. At present, the most common power batteries for lithium battery protection boards are lithium batteries, such as CATL's ternary lithium batteries and BYD's lithium iron phosphate batteries. Compared to other materials, lithium metal batteries can achieve higher energy density, but their stability is a major challenge.

To solve this problem, researchers have tested a new type of lithium metal battery that not only greatly improves the stability of the battery, but also has extremely high energy density.

At present, researchers from Karlsruhe Institute of Technology (KIT) and Ulm Helmholtz Institute for Electrochemical Energy Storage (HIU) have reported a new type of lithium metal battery through equipment. By improving the cathode and electrolyte of the battery, stability can be greatly improved and an energy density of 560Wh/kg can be achieved.

You should know that the current energy density of CATL's battery system is 215Wh/kg. The cathode of this battery uses a nickel rich cathode, which can store higher energy per unit mass compared to the commonly used graphite negative electrode.

However, the stability of nickel rich cathodes in commonly used organic electrolytes (LP30) still needs to be improved.

So researchers used a non-volatile and flame-retardant double anionic ionic liquid electrolyte, ILE, instead of LP30.

As is well known, the storage capacity of lithium-ion batteries decreases with increasing usage.

In the electrolyte LP30, ions break on the cathode, and in these cracks, the electrolyte reacts, resulting in structural damage. Not only that, a thick moss like lithium layer will also form on the anode. And ILE electrolyte can significantly reduce such reactions, thereby maintaining the storage capacity of the battery.

Experiments have shown that the capacity of this new type of lithium battery can still reach 88% of its original capacity after 1000 uses. Overall, this type of battery not only has high energy density and long lifespan, but also has good safety performance. This research is of great significance for achieving carbon neutrality in transportation modes.