Batteries are advantageous for short-term energy storage, while concentrated solar power plants may aid in grid stabilization.
FREMONT, CA: Wind and solar energy generation costs have decreased considerably. This is one of the reasons why the US Department of Energy anticipates renewable energy to be the fastest increasing energy source in the United States through 2050. However, energy storage remains very expensive. And, because renewable energy generation does not occur continuously—it occurs when the wind blows, or the sun shines—storage is critical. Some developing technologies may help make this possible.
Longer charges
Stay ahead of the industry with exclusive feature stories on the top companies, expert insights and the latest news delivered straight to your inbox. Subscribe today.
Most people already use batteries in numerous facets of their daily lives, from alkaline batteries for small electronics to lithium-ion batteries for cars and computers. However, there is still considerable room for growth.
For instance, high-capacity batteries with extended discharge times—up to ten hours—may be advantageous for storing solar energy at night or extending the range of electric vehicles. At the moment, just a few of these batteries are in use. However, new forecasts indicate that up to 100 gigawatts of these batteries will likely be built by 2050. This can have a significant impact on the viability of renewable energy.
One of the most significant impediments is the scarcity of lithium and cobalt, which are currently required to manufacture lightweight, powerful batteries. Around 10 percent of the world's lithium reserves and nearly all of the world's cobalt reserves, according to some estimates, will be gone by 2050.
Scientists are developing strategies for recovering lithium and cobalt batteries and developing batteries made of alternative materials. Towards the end of this decade, Tesla plans to begin manufacturing batteries free of cobalt. Sodium, which contains many of the same properties as lithium but is far more abundant, is another alternative.
Safer batteries
Another purpose is to increase the battery's safety. Electrolytes are one area of research—the medium, typically liquid, that allows an electric charge to flow from the battery's anode, or negative terminal, to the cathode or positive terminal.
When a battery is being used, the electrolyte's charged particles move about to keep the battery's charge balanced. Electrolytes frequently contain combustible substances. They can cause the battery to overheat and catch fire or melt if they leak.
Scientists are developing solid electrolytes that will strengthen batteries. Although particle movement is far more complex in solids than in liquids, positive lab-scale results indicate that these batteries could be ready for use in electric vehicles in the coming years, with commercialization targeted as early as 2026.
While solid-state batteries are ideal for consumer devices and electric vehicles, scientists are researching all-liquid systems dubbed flow batteries for large-scale energy storage.
Both the electrolyte and the electrodes are liquids in these devices. This enables super-fast charging and enables the manufacture of huge batteries. These technologies are prohibitively expensive, but research is continuing to drive down the cost.