Aqueous Batteries: Companies, Startups & Research

Salient Energy Inc., Form Energy and APh ePower are named aqueous-battery startups, with distinct chemistry and application focuses. Salient Energy develops zinc-ion batteries for grid storage; Form Energy is developing iron-air batteries for long-duration storage; APh ePower has patented aqueous aluminum-battery designs and zinc–vanadium cells. Their profiles indicate different routes rather than a single direct comparison.

The Chinese Academy of Sciences, Central South University and Nankai University are prominent research organizations in the field. Their recent work includes electrolyte additives, hydrogel and supramolecular electrolytes, and protective layers for zinc anodes. The Chinese Academy of Sciences also appears among recent contributors to studies on interfacial regulation and zinc deposition.

Aqueous batteries have received $111,271,804 across 127 grants since 2020. These figures summarize grant activity associated with the field. The funding-round entries include organizations and transactions that are not clearly specific to aqueous-battery development, so they should not be added to the grant total as dedicated sector funding.

Prime Planet Energy And Solutions and Panasonic Ip Management Corporation lead the listed patent holders, with 61 patents each. Panasonic Energy Co. Ltd follows with 54, while RIKEN has 42. The list also includes Guangdong Brunp Recycling Technology Co. and Fujifilm Co., reflecting activity across battery companies and research organizations.

No: patent activity fell 35.4% in the last 12 months compared with the previous 12 months, while publications rose 3.5%. The recent pattern suggests research output remains active even as patenting has slowed. These indicators describe different kinds of activity and do not by themselves show whether commercialization is advancing or retreating.

Recent developments include zinc-anode interface engineering, low-temperature electrolytes and long-life iron-flow chemistry. In September 2026, Chongqing University researchers reported a hydrated eutectic electrolyte with 9,650 hours of operation, and the Chinese Academy of Sciences reported an alkaline all-iron flow battery exceeding 6,000 charge-discharge cycles in October 2026. EnerVenue also secured an 11-MWh aqueous metal battery order in September 2026.

The main approaches include zinc-based, aqueous alkali-ion, multivalent-ion, iron-based, redox-flow and nickel-based batteries. Zinc systems are prominent in research but face anode instability; iron-based designs target long-duration storage. Flow batteries keep active materials in external tanks, while alkali-ion and multivalent-ion chemistries explore alternative charge carriers. Each trades off materials, transport, durability and system complexity.

China leads the listed country activity with 17,547 documents, followed by the United States with 10,685, Japan with 6,804 and South Korea with 5,180. China accounts for 39.9% of documents in the country breakdown. These figures indicate where recorded research and technology activity is concentrated, not necessarily where commercial production capacity is located.

Grid-scale storage, renewable energy integration, transport and mobility, portable and wearable electronics, and data centers and backup power are listed applications. Grid-scale storage shows recent growth of 29.0% against the previous 12-month period. Aqueous designs are especially relevant where safety and stationary storage needs can matter more than compact size, though each application still depends on performance and durability.