18 June 2026·PIB

Advancing electrolyte engineering for durable and affordable aqueous batteries

In this note

1. At a Glance

Aqueous Zinc-Ion Batteries (AZIBs) are water-electrolyte rechargeables positioned as low-cost, non-flammable alternatives to lithium-ion for grid-scale renewable energy storage [1].
Indian researchers (Ministry of Science & Technology ecosystem) have advanced electrolyte additive / interface engineering to suppress zinc dendrites, hydrogen evolution and corrosion — the four main failure modes blocking AZIB commercialization [1].
For UPSC: intersects GS-III (energy security, indigenous R&D, science & tech) and GS-II (governance of S&T institutions under DST) — a textbook example of frugal innovation supporting India's renewable & net-zero 2070 push.

18 June 2026: PIB release by the Ministry of Science & Technology announced a newly developed electrolyte additive that improves safety, lifespan and affordability of rechargeable zinc batteries via interface engineering rather than costly material redesign [1].
Parallel DST-funded work at CeNS, Bengaluru (autonomous body under DST) unlocked a new 1T-MoS₂ cathode enabling zinc-ion batteries for grid storage — published in ACS Energy & Fuels [2].

AZIBs emerged in the 2010s as an alternative to Li-ion because zinc is abundant, cheap, non-toxic, and water-compatible, eliminating flammable organic solvents [2].
Persistent commercialization barriers: zinc dendrite growth (short-circuits), hydrogen evolution reaction (HER) (electrolyte loss, pressure build-up), corrosion of Zn anode, and poor cycling stability [1].
Earlier strategies focused on expensive material redesign (new cathodes, separators); the new Indian approach uses cheap, scalable additive-based interface engineering [1].

Topic: Electrolyte engineering for AZIBs [1].
Nodal ministry: Ministry of Science & Technology, Government of India [1].
Related DST autonomous institute: Centre for Nano and Soft Matter Sciences (CeNS), Bengaluru — works on zinc-ion cathodes [2].
Battery chemistry: Zinc-metal anode + aqueous (water-based) electrolyte [2].
Key problems addressed: Zn-dendrite growth, HER, corrosion, low cycle life [1].
Strategy: Interface engineering through electrolyte additive (scalable, low-cost) [1].
Related performance benchmark (CeNS 1T-MoS₂ cathode): 97.91 % capacity retention after 500 cycles, Coulombic efficiency 99.7 %, current density 1 A g⁻¹, voltage window 0.2–1.3 V [2].
Publication venue (CeNS): ACS Energy & Fuels [2].

Scientific / Technological

Interface engineering modifies the Zn-anode/electrolyte interface chemistry, forming a protective layer that blocks parasitic water reduction (HER) and steers uniform Zn²⁺ deposition [1].
Avoids costly redesign of bulk electrode materials — a frugal, scalable lever [1].

Economic

Zinc is far cheaper and globally abundant vs. Li, Co, Ni → cuts import dependence and storage cost for renewable integration [2].
Aqueous electrolyte removes the need for dry-room manufacturing required for Li-ion, lowering CAPEX [1].

Environmental

Water-based, non-flammable, non-toxic chemistry → safer for stationary storage; supports India's net-zero 2070 and renewable energy targets [1][2].

Strategic

Reduces dependence on Li, Co, Ni value chains dominated by China, DRC, Australia, Chile — aligns with critical minerals security and Atmanirbhar Bharat [2].

Administrative / Governance

Demonstrates the DST autonomous-institute model (CeNS, INST etc.) for translational deep-tech research [2].

18 June 2026: PIB release — electrolyte additive for safer, longer-lasting, affordable Zn batteries via interface engineering [1].
2025–26: CeNS Bengaluru (DST) reported sulfur-vacancy-induced 1T-MoS₂ cathode for AZIBs with ~98% retention over 500 cycles [2].

AZIBs use a water-based (aqueous) electrolyte — non-flammable, unlike Li-ion organic electrolytes [1].
Main failure modes of Zn anodes: dendrite growth, HER, corrosion, poor cycling [1].
The June 2026 advance uses electrolyte additive / interface engineering, NOT new cathode material [1].
Nodal ministry: Ministry of Science & Technology [1].
CeNS Bengaluru is an autonomous institute under DST [2].
CeNS cathode material for AZIBs: 1T-phase MoS₂ with sulfur vacancies [2].
CeNS battery retention: 97.91 % after 500 cycles, CE 99.7 % [2].
Voltage window: 0.2–1.3 V vs Zn²⁺/Zn [2].
Zinc is preferred for grid storage due to abundance, low cost, safety, high theoretical capacity [2].
Target application: large-scale renewable energy storage [1].

National Critical Mineral Mission — Li/Co/Ni dependency context.
PLI Scheme for Advanced Chemistry Cell (ACC) batteries — manufacturing push.
National Green Hydrogen Mission — sister clean-energy storage vector.
Solar / Wind RE targets (500 GW non-fossil by 2030) — drives storage demand.
CeNS, INST Mohali, ARCI Hyderabad — DST autonomous bodies in materials R&D.
Lithium-ion battery basics — for contrast.
India's Net-Zero 2070 pledge (COP26) — policy backdrop.
Anusandhan National Research Foundation (ANRF) — new R&D funding architecture.

AZIB ≠ Zn–air battery and ≠ Ni–Zn; AZIB uses Zn²⁺ intercalation in aqueous electrolyte.
Nodal ministry is Ministry of Science & Technology / DST, NOT MNRE or Ministry of Heavy Industries.
The June 2026 work is about an electrolyte additive, not a new cathode (separate CeNS work).
HER (Hydrogen Evolution Reaction) is a parasitic side reaction in AZIBs — not the working reaction.
CeNS is in Bengaluru and under DST, not under MeitY or CSIR.