changeadminBengaluru-based scientists have unveiled a breakthrough that could power the next generation of eco-friendly batteries. Moving beyond lithium batteries, the current favourite, researchers have designed a cathode material suitable for more environmentally friendly Zinc batteries.
Significant advances in energy storage over the past few decades have focused mainly on lithium batteries due to their desirable performance, particularly their high energy density. However, they pose several environmental and safety risks during use.
As an alternative, aqueous zinc-ion-based battery (ZIB) systems have recently attracted attention for their high energy storage capacity, safety, and environmental friendliness.
Researchers around the world are developing various cathode materials suitable for zinc-ion-based electrolyte systems that can last long and deliver high energy storage capacity.
Several oxide materials have already been investigated in this regard, but have failed to demonstrate the required performance in zinc-ion-based systems due to several limitations.
To solve that, a research team led by Dr Ashutosh Kumar Singh of the Centre for Nano and Soft Matter Sciences (CeNS), an autonomous institute under India’s Department of Science & Technology (DST), have come up with a new simple strategy to activate the cathode material by thermo-electrochemical treatment to modify its structure.
This could help the batteries gain high energy storage performance. This represents a straightforward and efficient approach to enhancing the overall energy density and stability of the usual cathode materials.
Fig. The in-situ thermo-electrochemical activation of V2O5 cathode material.
The innovation lies in a simple “activation” process for a standard battery material, vanadium oxide (V2O5). By treating it with a special combination of heat and electricity, they transformed its structure, deliberately creating useful “flaws” or defects. Think of it like turning a solid, smooth wall into a porous, spongy one.
This new, imperfect structure, called zinc-vanadium oxide (Zn-V2O5), has tiny spaces and pathways that allow it to store and release energy far more efficiently than V2O5. The Zn-V2O5 structure also allows hydrogen ions from the battery’s electrolyte to interact with the structure, thereby improving structural stability and lowering the barrier to zinc ion movement during battery charging/discharging.
The activated material enables the zinc-ion battery to achieve a dramatically higher energy density and incredible longevity. It can store much more energy and be recharged thousands of times without significant degradation.
These findings by Dr Ashutosh Kumar Singh and his team were recently published in the Advanced Energy Materials, tackling a long-standing challenge in zinc-ion battery research.
Mr Rahuldeb Roy, a co-author of the research, said, “By realising the difficulty involved in stabilising the cathode material as well as structurally modifying to gain the enhanced performance, we opted for an oversimplified but novel strategy to activate the usual cathode materials used for Zn-ion battery.”
He added that this study not only advances the field of zinc batteries but also that this particular technique can be applied to other cathode materials to enhance storage performance. It could lead to greater efforts to develop sustainable and efficient energy storage technologies for a greener future.
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