Battery knowledge · Electrochemistry fundamentals
Oxygen recombination
The internal cycle that lets sealed nickel and valve-regulated lead–acid cells tolerate overcharge: oxygen evolved at the positive electrode diffuses to the negative and reacts back to water, so the excess charge ends as heat instead of gas. It is why NiMH can take a C/10 trickle charge and lithium-ion, which has no such route, cannot.
- Also called
- oxygen cycle, recombinant cycle, internal recombination
Example
Electrochemistry fundamentals: an example situation
A circuit can predict terminal voltage while leaving electrode potentials and reaction kinetics unresolved.
Read Oxygen recombination alongside dT/dt termination in this context. Ending a nickel-cell fast charge when the temperature climbs faster than a set rate, typically about 1 °C per minute, because once the cell is full the charge no longer stored chemically turns into heat. It needs a thermistor against the cells and a charge rate of roughly 0.5C or more to produce a clear rise.
Use in Lemonergy
Connect reaction sites and transport paths.
This is a reference concept. No executable Lemonergy block has been verified for this term.
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.
- Quantities, Units and Symbols in Physical Chemistry, 3rd edition, 2nd printing
IUPAC · 2011
Topic background · Physical-chemistry notation, thermodynamics, electrochemistry and transport quantities.