• Are Liquid Batteries the Key to a Renewable Energy System?

Fuel for Thought

Are Liquid Batteries the Key to a Renewable Energy System?

Mar 22 2023

In 2009, Donald Sadoway, a materials chemistry professor at MIT, conceived a groundbreaking battery that could revolutionize the way cities are powered, making it possible for solar energy to be stored and utilized during nighttime hours. This innovation is of particular importance as the world transitions to renewable energy sources to combat climate change. 

Conventional batteries have limitations that hinder their effectiveness for large-scale energy storage. They are composed of at least one solid active material, which restricts conductivity and current flow. Moreover, solid materials can degrade over time, reducing their overall lifespan. 

A promising solution to these problems is the liquid battery, which utilizes all-liquid active materials. Current prototypes indicate that liquid batteries could cost less than a third of today's best batteries and have a substantially longer lifespan. 

Unlike conventional batteries, liquid batteries use molten metal electrodes and a molten salt electrolyte to conduct current. This design results in a highly resilient device that can quickly absorb vast amounts of electricity. Sadoway's liquid battery can operate at electrical currents "tens of times higher than any [battery] that's ever been measured." Moreover, the materials are inexpensive, and the manufacturing process is straightforward. 

The first prototype of the liquid battery features a container surrounded by insulating material, with molten raw materials added in distinct layers. The container doubles as a current collector, connecting to power supplies like solar panels or to the electrical grid to provide energy to homes and businesses. 

Liquid batteries can play a crucial role in the transition to renewable energy sources, especially in large-scale storage applications. By enabling the storage of excess energy generated during periods of low demand, liquid batteries can help reduce the need for new power plants and transmission lines. They are also versatile, making them suitable for use in various locations. 

One significant challenge to implementing liquid batteries on a massive scale is the requirement for solar farms large enough to generate excess power for charging the batteries. However, the benefits of cheap, long-lasting energy storage outweigh the difficulties, positioning liquid batteries as a critical component in the global shift toward renewable energy

Sadoway envisions wiring large cells together to create massive battery packs capable of meeting peak electricity demands in cities like New York City, which requires about 13,000 megawatts. Such a battery pack would cover nearly 60,000 square meters. 

While numerous energy storage solutions have been proposed for intermittent power sources, the liquid battery offers several advantages. It is cost-effective, durable, and applicable in a wide range of settings. According to Sadoway, "No one had been able to get their arms around the problem of energy storage on a massive scale for the power grid. We're literally looking at a battery capable of storing the grid." 

Since the development of initial prototypes, the research team has altered the metals and salts used in the liquid battery to improve its practicality. Although Sadoway has not revealed the new materials, he confirms that they function based on the same principles. The team anticipates that a commercial version of the battery will be available within five years. 

As the world moves toward a more sustainable future, liquid batteries have the potential to revolutionize the way we store and utilize renewable energy. Their affordability, longevity, and adaptability make them a promising solution for large-scale energy storage, paving the way for cities to rely on renewable energy sources even during the night.


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