"Aqueous zinc-ion batteries are emerging as a credible alternative to lithium-ion for grid storage. Discuss the techno-economic case and the R&D challenges India is addressing." (15M)

Aqueous zinc-ion batteries (AZIBs) use a zinc-metal anode with a water-based electrolyte instead of the flammable organic solvents of lithium-ion cells. With India targeting 500 GW non-fossil capacity by 2030 and net-zero by 2070, cheap and safe stationary storage is the binding constraint — and AZIBs are a credible, though not yet commercial, answer.

The techno-economic case

• Cost and abundance: zinc is abundant, cheap and non-toxic compared with lithium, cobalt and nickel, lowering the cost of storage for renewable integration [2].
• Safety: the aqueous, non-flammable chemistry suits large stationary grid installations, where fire risk — not weight — is the binding design concern [1].
• Manufacturing: water-based cells avoid the dry-room, inert-atmosphere assembly lithium-ion demands, cutting capital expenditure [1].
• Strategic autonomy: substituting zinc for imported Li-Co-Ni reduces exposure to concentrated global critical-mineral value chains, complementing the National Critical Mineral Mission [2].

R&D challenges India is addressing

• Failure modes: commercialization is blocked by zinc dendrite growth, the parasitic hydrogen evolution reaction (HER), anode corrosion and poor cycling stability [1].
• Interface engineering: scientists at INST Mohali developed an electrolyte additive (BDIM) that adsorbs on the zinc surface and regulates the inner Helmholtz plane — a scalable fix that avoids costly bulk-material redesign [1].
• Cathode innovation: CeNS Bengaluru unlocked a sulfur-vacancy 1T-MoS₂ cathode, retaining 97.91% capacity over 500 cycles at 99.7% Coulombic efficiency [2].
• Lab-to-grid translation: institutional tie-ups such as JNCASR–Hindustan Zinc are attempting scale-up of indigenous Zn-ion technology [3].

The techno-economic logic is settled; durability is the frontier. India's DST-anchored institutes are attacking precisely that gap through frugal, scalable chemistry rather than import-heavy redesign. Sustained support — linking such research to ACC-battery manufacturing incentives and ANRF funding — can convert this laboratory advantage into affordable grid storage, advancing both energy security and the climate commitments made at COP26.