Ammonium-ion battery

Example

Use in Lemonergy

Do not carry lithium-ion assumptions into every chemistry.

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Aqueous battery

Any battery whose electrolyte is water-based, from lead–acid and nickel–metal hydride to aqueous zinc-ion and sodium-ion designs. Water is cheap, non-flammable and highly conductive, but it splits at 1.23 V in theory and around 2 V in practice, which caps cell voltage and energy density.

Aqueous zinc-ion battery

A rechargeable cell with a zinc-metal negative and mildly acidic zinc sulfate electrolyte, in which Zn²⁺ ions and protons insert into a manganese oxide or vanadium oxide positive. It is cheap, non-flammable and runs at about 1.3–1.5 V, aimed at stationary storage; dendrites, hydrogen evolution and dissolution of the positive limit cycle life.

Organic electrode material

An active material made of carbon-based molecules or polymers, such as quinones, imides or nitroxide radicals, that store charge by reversible redox of their functional groups. They need no mined metals, work with lithium, sodium, potassium and zinc ions alike, and can be tuned by chemistry; dissolution in the electrolyte, low density and poor conductivity are the obstacles.

Prussian blue analogue

An open-framework compound, AₓM[Fe(CN)₆], in which iron–cyanide units and another metal form a cubic cage with wide channels for large ions. Made at low temperature from cheap elements, its sodium-rich form, Prussian white, is a leading sodium-ion cathode. Water trapped in the lattice degrades cells, and the cyanide groups raise questions in thermal runaway.

References & further reading

Further reading on this topic

These sources provide broader context; they are not presented as citations for every statement in this entry.

1. Promise and reality of post-lithium-ion batteries with high energy densities

   Jang Wook Choi, Doron Aurbach · Nature Reviews Materials · 2016

   Topic background · Post-lithium-ion materials and battery concepts, including practical cell-level limitations; historical 2016 perspective.

2. DOE/EPRI 2013 Electricity Storage Handbook in Collaboration with NRECA

   Sandia National Laboratories · 2013

   Topic background · Storage technologies and grid services. The publisher notes that its historical cost and deployment figures are outdated.