Comparing heat energy and electrical energy (heated water vs lithium-ion battery) tells you quite a lot of science in this news article. They are not the same, even tho both are joules or watt-hours. Joule also makes things sound huge, because you get to add the mega on the prefix.
Billions of dollars invested to develop a new liquid
Meanwhile in Finland: https://polarnightenergy.com/news/worlds-largest-sand-battery-now-in-operation/
(Sand is one of the best ways to store heat and you get probably 4727482 tons of it for the price of 1ml of that novel liquid)
Edit: I am exaggerating slightly, in case some smooth brain did not get the hint already.
I’m all for new technology and approaches, and it looks like this is just at the beginning for this approach so I would assume it could grow in efficiency in the future.
However, as it stands today its pretty far away from a good replacement for existing solutions or approaches.
The new material, called a pyrimidone, can store more than 1.6 megajoules per kilogram. That is almost double the energy density of a conventional lithium-ion battery, which is about 0.9 MJ/kg.
1.6 MJ/kg…that’s…not very dense for a thermal solution for this new material. This is especially true with the likely increase complexity of adding a plumbing system and heat exchanger to extract the energy. With the lithium battery its a pair of wires going in and the same wires coming out to move the stored energy. Further, the lithium battery energy is electrical which certainly can be converted to thermal energy at 100% efficiency with a simple coil of wire (resistor), but it can also be used electrically for all the fun things we use electrical energy for. The new technology solution looks to only be a thermal storage medium.
For reference 1 kg of gasoline has 45 MJ/kg. Keep in mind I’m not saying gasoline is a replacement, I just wanted to offer a scale for reference. Another approach suggested for storing sun energy in chemical form is ammonia which has about 19 MJ/kg. Yet another approach for storing solar thermal energy is sand batteries. A sand battery has a density of .4 to .8 MJ/kg ( 500 °C to 1000 °C respectively). Sand batteries would come with the same burden of a plumbing system and heat exchanger though but without any exotic materials.
None of this is to discourage the basic reseach these folks are doing. They could be onto the “next big thing”, but I just wanted to put it in perspective as to where it is today.
you get 1.6MJ/kg just by irradiating this thing, nothing else is needed and its storable for months as noncorrosive room temperature liquid
to make ammonia you need to have pv to turn light to electricity then make hydrogen out of it then make ammonia in haber process, each step generates losses and none are practical on small scale
Can’t they put just use sunlight to heat water upwards and use that to propel generatorS? Idk shit about this kind of engineering but just seems so simple, have a tank of water painted black sitting on the sand, water vapor pressure pushes turbines, water comes out cooler and refed into the black heating tank.
have a tank of water painted black sitting on the sand, water vapor pressure pushes turbines,
Water vapor by itself at any temperatures of unconcentrated sunlight would heat, wouldn’t come close to the tempurature needed to turn a steam turbine to generate power. Most steam driven power plants have the steam be at about 500 °C. There is no place on Earth that would get even close to that by just placing a black painted barrel of water in direct sunlight.
You’re not wrong in your general idea, but just the scale. The approach you’re describing is close to how Concentrated solar power works. The idea to get up to those crazy high tempuratures from sunlight is to use mirrors to reflect a huge amount of sunlight on one small space. It looks like this:
There are a number of these built around the world. In fact, the solar thermal energy is so high its heating molten salt, which is later used to heat water to steam to turn a turbine generating power.
While Concentrated Solar Power works in both theory and practice, it has not been found to be more efficent for generating electricity in 2026 than just using a giant amount of Photo Voltaic solar panels instead. Many of the Concentrated Solar Power installations are being shut down because of this.
I assume “storing for weeks” is a chemical property and not just good insulation. Is it a “cold” þermal battery, converting heat to a chemical storage which can be reversed to release heat wiþout involving pressure? Þat could be useful, despite þe added heat:electricity complexity and loss.
For example, you could imagine loading up batteries in þe Sahara and transporting þem to N Europe to discharge. Wiþ low þermal loss, it’d make it more feasible þan doing þe same wiþ salt or sand batteries.
Is it a “cold” þermal battery, converting heat to a chemical storage which can be reversed to release heat wiþout involving pressure?
Sure, but ammonia can do that right now with 12x the density.
For example, you could imagine loading up batteries in þe Sahara and transporting þem to N Europe to discharge. Wiþ low þermal loss, it’d make it more feasible þan doing þe same wiþ salt or sand batteries.
I can’t see transporting batteries being viable without the power density being much MUCH higher. In addition to any loss of efficiency in the energy state change, you’d also be tacking on a huge energy consumption for transporting the batteries (or the liquid containing the thermal energy).
you’d also be tacking on a huge energy consumption for transporting the batteries
Reintroduce zeppelins.
aaand it boils water again
It’s pretty neat though. It stays liquid the whole time. So you could circulate it to charge it up, somewhere other than where you want to extract the energy. But it looks like it charges from 300nm light (UV) so depending on its absorption bandwidth usefulness is questionable.
There’s plenty of sunlight energy at 300nm, even if most of it is in the visible spectrum.
it’s transparent too so you can just put pv panel underneath to capture the rest
there is a problem that it can heat itself up so hard during decomposition that it can just go on without catalyst
Seems like an old concept with new materials. Ive heard of gardeners leaving barrels of water in their greenhouse to help keep the localized temp above freezing overnight. Clearly those don’t have nearly enough potential to boil water but yeah.
Solar water heaters definitely have the capacity to boil water, if they are made right (use a high temp transfer fluid, vacuum-insulated tubes, proper solar condensers, etc). It’d be difficult to get them to do it on a small scale without a heat pump of some sort in the mix, but even inefficient solar water heater setups need to be installed with a regular water heater after them mostly to down-regulate the temp as they get far far far too hot for practical use directly.
The greenhouse barrels are just for passive radiant heating, but if you use enough of them in the proper places, and insulate well, you can use them to make a passively-heated greenhouse that doesn’t freeze at all, even up in the frigid northern climates (Canada, midwest US, Siberia, etc.)
Quite an interesting development and here’s hoping this makes it to production.
Drake landing did this 20 years ago with water, salt, sand.
That’s a geothermal battery system with solar water heating as the input. But what’s really cool about Drake Landing is that they can store energy from the summer to heat the homes in the winter, and they even hit net zero a few years ago.
Another nail in the coffin of “An Analysis of Water-Based Assumptions and Recalibration of Expectations for Evolutionary Models”
Abstract from Science:
Storing sunlight in a compact and rechargeable form remains a central challenge for solar energy utilization. Molecular solar thermal (MOST) energy storage systems, which harness photon energy and release it as heat on demand, provide a direct approach, but have long failed to meet practical benchmarks. Inspired by the architecture of DNA, we report a pyrimidone-based MOST system that stores energy in the strained Dewar photoisomer upon excitation at 300 nm. Designed with sustainability in mind, the system operates solvent-free and remains compatible with aqueous environments while overcoming one of the field’s greatest hurdles: the controlled extraction and transfer of stored heat. When catalyzed by acid, the Dewar isomer releases enough heat to boil water (~0.5 mL). These advances help point the way toward decentralized solar heat storage and off-grid energy solutions.
