Breakthrough in Electrolyte Engineering for Zinc‑Ion Batteries
Scientists at the Institute of Nano Science and Technology (INST), Mohali, have created an electrolyte additive called BDIM. The additive selectively adsorbs on zinc metal, regulates the Inner Helmholtz Plane (IHP), and curbs unwanted reactions such as hydrogen evolution reaction (HER). The work, published in ACS Electrochemistry, offers a practical route to extend the life of Aqueous zinc ion batteries (AZIBs) without costly material redesign.
Key Developments
- BDIM contains multiple oxygen and nitrogen donor sites that bind strongly to zinc, displacing water molecules from the electrode interface.
- By occupying the IHP, BDIM reduces water‑induced side reactions, suppressing zinc dendrite formation and corrosion.
- Researchers used a ultramicroelectrode (UME) together with fast‑scan cyclic voltammetry (FSCV) to directly monitor charge‑transfer and mass‑transfer kinetics during zinc deposition.
- The additive was synthesized by reacting glutamic acid with NaOH, followed by glyoxal, formaldehyde and acetic acid, heating at 70 °C for 24 hours, and lyophilising the product.
Important Facts
The study shows that BDIM‑treated zinc anodes exhibit markedly lower HER currents and reduced corrosion rates compared with untreated cells. The additive’s selective adsorption on the negatively polarized zinc surface creates a protective layer that limits water access, thereby improving cycling stability and safety. The research was led by Dr. Ramendra Sundar Dey, Scientist E, INST, and is expected to benefit grid‑scale renewable energy storage, backup power systems, and other large‑scale applications.
Exam Relevance
Understanding this technology is important for GS 3 (Science & Technology) and GS 3 (Economy) topics such as energy storage, renewable integration, and indigenous innovation. The development illustrates how India’s research ecosystem—through agencies like the Department of Science and Technology (DST)—can produce cost‑effective solutions for critical infrastructure. It also highlights the role of interface engineering, a concept that can be linked to broader discussions on material science and sustainable technology.
Way Forward
For policy makers, the next steps include:
- Facilitating scale‑up of BDIM production through public‑private partnerships.
- Integrating the additive into national programmes for renewable energy storage and smart grid development.
- Encouraging further research on electrolyte additives for other battery chemistries.
- Monitoring performance in pilot projects to validate long‑term reliability and cost benefits.
By extending battery life and reducing maintenance costs, the technology can lower the overall cost of renewable energy deployment, supporting India’s climate goals and energy security.