Thermal battery stores 100 times more heat than water

[Planetx7]

Hello,
you've heard of this super thermal storage method: Thermal battery stores 100 times more heat than water
13.1.2018: in 39 Nachrichten Science:
https://energiestammtisch.hpage.com/39nachrichtenscience2017.html

  Thermische Batterie speichert 100 Mal so viel Wärme wie Wasser http://www.trendsderzukunft.de/waermebatterie-neues-material-wirkt-als-hocheffizienter-waermespeicher/2018/01/11/ - AzoPMA ein Polymer https://d-nb.info/1119447607/34

https://www.ipfdd.de/de/organisation-und-leute/personal-homepages/prof-dr-brigitte-voit/optisch-und-thermisch-sensitive-polymermaterialien/ - https://www.nature.com/articles/s41598-017-17906-w poly(4-phenylazophenyl methacrylate) (AzoPMA), can have energy densities up to 698 J/g

https://www.nbcnews.com/mach/science/battery-bottles-sunshine-could-bring-new-solar-revolution-ncna836416 - Paving the Way for a Non-Electric Battery to Store Solar Energy https://www.umass.edu/newsoffice/article/paving-way-non-electric-battery-store

that sounds so unbelievable, and I have not found anything since then, does that know of you?

[e2matrix]

Not sure how that would be possible.   Traditional science at least says water can store more kilocalories per mole than any other substance.  Is this actually about storing heat or is it about storing power in batteries?

[F6FLT]

The energy density of a lithium metal battery is 1.8 MJ/Kg.
In the last link, they say they have 510 J/g, which means 0.51MJ/Kg.

It's less than a third of a lithium battery, and it's thermal energy, not electricity. Not bad but imho we are still rather far from practical applications.

[Floor]

Its about thermal energy....

https://www.umass.edu/newsoffice/article/paving-way-non-electric-battery-store

The term "battery" does not of necessity  refer to a battery of electric cells.

" Azo PMA Ounce for Ounce it holds 200 times as much thermal energy as water"

        floor

[onepower]

e2matrix

Not sure how that would be possible.   Traditional science at least says water can store more kilocalories per mole than any other substance.  Is this actually about storing heat or is it about storing power in batteries?

The issue is few understand the term "heat" and even fewer understand the term "energy" within a broad context.
For example water can store a large amount of energy as heat or thermal energy which relates to the internal kinetic energy of it's particles. Water does have the highest specific heat at 4.18 kJ/Kg.K however a sodium acetate hand warmer can store magnitudes more energy than water because it can store energy as sensible heat which we can feel and as latent heat relating to a reversible chemical process. So the sodium acetate can give up heat and drop in temperature like water then you click a little disk and it heats up again because of the stored latent energy generating even more heat.

As such we should understand that "heat" relates to to the internal kinetic energy of a substance however this does not always represent the total energy of the substance. Heat is simply a form of energy however there are many other forms of energy which can be stored in a substance and converted to heat on demand.