Breakthrough energy density technology -Lithium - Ion Battery Equipment

Breakthrough energy density technology -Lithium - Ion Battery Equipment

A Canadian battery research team led by Tesla battery expert Jeff Dahn is about to break through the energy density barrier of a new, next-generation battery. The team recently published the discovery in a new paper, Resolving Anode-Free Battery Defects with Electrolyte Solutions. After breaking this barrier, the energy density of next-generation battery cells is expected to reach revolutionary and unprecedented heights.

According to the paper, "Diagnosing and Correcting Anode-Free Battery Failure Through Electrolyte and Morphological Analysis," Dahn and his team showed that some anode-free batteries have a higher unit storage capacity than conventional lithium ions, which is important for increasing the The range of electric vehicles is critical.(Lithium - Ion Battery Equipment)

Anode-free batteries are also lighter than conventional batteries, said Hansen Wang, a battery researcher at Stanford University.

"The idea is to use lithium only on the cathode side to reduce the electric weight," Hansen said in an interview. However, as energy storage capacity increases, some headwinds start to emerge. One of them, according to the abstracts of the papers published in the scientific journal Nature, is that the battery loses its capacity too quickly and has a shortened lifespan.

Additionally, there are safety concerns with anode-free batteries, which involve the metallic lithium inside the battery.

Dahn and his team found that using a double-salt carbonated electrolyte solution to counteract the effects of degradation was able to extend the life of anode-free batteries.

The team noted:
"Recently, we demonstrated that the lifespan of anode-free batteries can be extended using a double-salt carbonate electrolyte. We employed 2.6 g Ah−1 liquid electrolyte to participate in the degradation process of anode-free batteries in our experiments, using scanning electron microscopy and X-ray tomography Observe the degradation of the pristine lithium form and diagnose the cause of electrolyte degradation and depletion using nuclear magnetic resonance spectroscopy and ultrasound projection spectroscopy. For safety feature testing, we measure the battery temperature during nail penetration."

Using a double-salt carbonate electrolyte solution in the battery, Dahn's team found that an inactive mixture of dead lithium forms large lithium columns in the battery, creating a typical lithium form within the battery that can address service life. shorter question.

Tesla has previously patented an electrolyte solution that could be added to lithium-ion batteries to extend the life of the battery. The optimized electrolyte successfully extended the life of the anode-free battery to 200 cycles, a significant improvement.

For example, the Stanford University experiment mentioned above was conducted in June 2020. Experiments show that the anode-free battery can run for 100 cycles before the capacity drops to 80 percent.

The results of this research will lead to longer battery life in electric vehicles. Tesla has been working hard to develop a battery with a million-mile range, which may be revealed at the company's Battery Day event on September 22.

While energy density is key to extending range, there is a fine line between extending range on each charge. Dahn's team's research will eventually continue, which is a major advance in terms of past research results.



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