Tag Archives: energy density

Solar Thermal Fuel

A few months ago, a paper was published called Macroscopic heat release in a molecular solar thermal energy storage system available here: https://pubs.rsc.org/en/content/articlehtml/2018/ee/c8ee01011k

The overall concept is explained in this one sentence: “A solar thermal fuel is like a rechargeable battery, but instead of electricity, you put sunlight in and get heat out, triggered on demand,”  – Jeffrey Grossman, Engineer MIT

Here is a simple diagram that shows the concept:

When heat from the sun warms a fluid, it changes the molecules so that this heat can be released at a later time on demand when it is exposed to a catalyst.

What I see as a huge instant benefit is the efficiency of the system. Solar panels are around 20% efficient, which is horrible, but some of the best solar heat collectors such as the evacuated tube collectors can be in the high 90%. Being that heating accounts for about half of the average home energy use, this method makes a lot of sense.

It is likely you have experience with a fluid that operates similar to this – sodium acetate heating pads. These are plastic containers with a simple chemical solution. When you heat them up, the solution liquefies and stays that way until activated. There is a tiny metal, flexible disc inside. When the disc is bent or “clicked”, it triggers a chain reaction crystallization process of the chemical that heats up.  This is of course oversimplified compared to the Solar Thermal Fuel technology, but is suffice to convey the concept in simple terms.

For an article, which is much simpler than the paper listed at the top of this post, go here: https://www.sciencealert.com/scientists-develop-liquid-that-sucks-up-sun-s-energy

Beyond Lithium Batteries

John Goodenough

John Goodenough is one of the original developers of the lithium ion battery. Recently, he has been involved in developing some battery technology that has 3-10 times or greater the energy density of lithium ion batteries. And, they’re very safe, non-toxic, and can be charged REALLY fast!

“Cost, safety, energy density, rates of charge and discharge and cycle life are critical for battery-driven cars to be more widely adopted. We believe our discovery solves many of the problems that are inherent in today’s batteries,” Goodenough said.

These batteries can also be made at a much lower cost since sodium can be used instead of lithium, which is in massive abundance in sea water. The electrolytes in this battery are actually made of a solid GLASS and is changing the way batteries and electricity are looked at.

Read this for more of the story: https://news.utexas.edu/2017/02/28/goodenough-introduces-new-battery-technology

Here is an abstract of the paper that discusses this revolutionary battery technology: http://pubs.rsc.org/en/Content/ArticleLanding/2017/EE/C6EE02888H#!divAbstract

This is a related abstract: http://pubs.rsc.org/en/content/articlelanding/2016/ee/c5ee02924d#!divAbstract