[jobu]

I found an article from April 2016 that talks about an electrolyte breakthrough with zinc and manganese batteries:

> the test battery was able to reach a storage capacity of 285 milliAmpere-hours per gram of manganese oxide over 5,000 cycles, while retaining 92 percent of its initial storage capacity.

https://www.sciencedaily.com/releases/2016/04/160418145631.h...

According to Wikipedia, lithium ion batteries have an energy density of 100–265 Watt-hours per kilogram at 3.6 - 3.8 Volts with 400 - 1,200 cycles. Converting that to Amp-hours (Wh)/(V) =(Ah) means about 74 Ah/Kg in the best case scenario.

I'm not sure if the tech from University of Adelaide is the same as what was published by Pacific Northwest National Laboratory, and I wasn't able to find any info about discharge/recharge rate, but it looks like it compares very well to lithium ion in the other areas.

[aidenn0]

It's not meaningful to compare Ah between different cell chemistries, because they may have different voltages. You should convert the Ah to Wh and then compare. For Zn-Mn typical cell voltages are a bit less than half that of Li Ion batteries.

For actual apples-to-apples comparison you will want to compare actual battery assemblies -- the numbers reported from labs often exclude parts of the batteries. In this case they are comparing just the MnO2 cathode weight judging by the quote you posted. Some of the wikipedia numbers on Li Ion will also be from articles like this too, so who knows how it reflects on reality.

[strbean]

A "per gram of manganese" energy density doesn't really translate directly into... energy density... does it?