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Rechargeable lithium battery (LIB) is considered as the best hope for the next generation of battery technology due to its long life, high specific power and energy density. However, they cannot meet the rising demand of emerging technologies such as electric vehicles. Li-Se battery technology is increasingly considered as a potential substitute for LIBs due to its high theoretical volume capacity and higher conductivity.

In the first similar study published in Nature Communications, engineers from Surrey Institute of Advanced Technology (ATI) and the technical team of the University of Sydney worked together to introduce in detail how they used monoatomic catalysts to produce efficient cathodes for Li-Se batteries. Their batteries have excellent speed capability and excellent long-term cycle performance.

Sari's team used the zeolite imidazole framework (ZIF) particles placed on the surface of polystyrene spheres to be controlled exquisitely. Then, the core shell of ZIF is converted into carbon material with hollow structure. Through further fine-tuning, ATI team successfully produced atomic cobalt electrocatalyst, nitrogen-doped hollow porous carbon, nitrogen-doped hollow porous carbon and cobalt nanoparticles. The carbon/selenium composite was produced by embedding selenium in the hollow carbon particles.

As the cathode material of Li-Se battery, atomic cobalt electrocatalyst shows excellent electrochemical performance, including excellent rate capability (311mAh g-1 at 50C) and excellent cycle stability (267 mAh g-1 after 5000 cycles, the capacity attenuation of each cycle is 0.0067% at 50C current density), and the coulomb efficiency is about 100%.

Dr. Jian Liu, an associate professor of energy materials at ATI, one of the important authors, said: "We really believe that our atomic cobalt doped synthetic materials can pave the way for lithium selenium batteries and make it the preferred battery technology for future generations.". Although our results are incredibly encouraging, there is still a way to go to realize our dream of high capacity and sustainable battery technology.

Professor Ravi Silva, director of ATI at the University of Surrey, said: "We are extremely proud of the creative and excellent work done by Dr. Liu's team. This research may be a decisive moment in the development of sustainable battery technology.".

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