What should I know about a Saltwater Battery?

The Facts about Saltwater Batteries

Sodium chloride is the electrolyte used in a salt water battery. Batteries making use of toxic or flammable materials are more difficult to recycle; they are non flammable.

Due to their proven technology and continuously decreasing costs, lithium-ion batteries are the market's main energy storage choice. There are also alternatives to lithium-ion storage, such as saltwater batteries. These have been around for years in various forms, and they are poised to have a tremendous impact on energy storage in the coming years.

In the last few years, solar energy has moved beyond niche markets. Some people do not have access to a grid connection, so they are switching to this renewable energy source. A reliable storage system becomes essential to such users. For now, another storage option dominates the industry. This market could be drastically changed by saltwater batteries.

The maintenance-free nature of these batteries makes them a great option. This article describes all the important information about this storage option. So let’s dive straight in.

Structure of Saltwater Batteries


As well as an anode, cathode, electrolyte, separator, current collector and battery housing, an aqueous sodium ion battery cell has anode, cathode, electrolyte, and current collector. It is similar to the construction of a lead-acid battery, except that it uses environmentally friendly, non-toxic materials.

Charging a Saltwater Battery

It is relatively simple to operate the battery. The sodium ions migrate to the anode and settle in the grid of the anode during charging because of the current collector, which carries electrical energy into the battery.

Discharging a Saltwater Battery

The process of discharging occurs in reverse. In the case of the sodium battery, the sodium ions are directed to the cathode, and the electrical energy is transferred to the consumer via the current collector.

Saltwater Batteries: What are they? Saltwater Batteries: How do they work?


A saltwater battery stores electricity to be used later just like any other form of battery. Saltwater batteries are chemistry-based batteries with a distinct advantage over other energy storage methods (for example, lithium-ion and lead-acid batteries). An electrolyte solution of salt water captures, stores, and eventually discharges energy in saltwater batteries. The batteries that you find in your saltwater tap use sodium, the same element as the one found in table salt, for conducting electricity, unlike traditional lithium-ion batteries.

The Advantages of Saltwater Batteries

As a result of their chemistry, saltwater batteries provide a number of benefits. In addition to their potential use with solar panels, some of these attributes have led to their becoming a promising energy storage medium for the future:


Additionally, saltwater batteries have the advantage of being recyclable because they do not contain heavy metals and toxic elements. Batteries are becoming a bigger part of our lives globally, so it is essential that we make plans for their recycling in order to make batteries truly sustainable energy sources.

Maintenance is not required

Batteries soaked in saltwater are able to discharge fully without being harmed. Additionally, a fully discharged battery won't have a negative effect on the cycle life of the battery. Moreover, the battery can run for up to a week or two without being charged. It is therefore not necessary to control the charge of batteries with battery maintenance systems.

Lifecycle that is quite long

In contrast to many other battery options, saltwater batteries have a long lifecycle, making them able to be used for long periods of time. It would mean that saltwater batteries would need to be replaced less often than most lithium-ion batteries and that over time, you would likely save money.

A salt water battery is no exception; after some time, it will degrade. Their capacity drops to 70% after 4,000 cycles, according to Aquion. When discharged over a period of 4 hours, one should still be able to produce 1.1 kilowatt-hours after 8 years.

Disadvantages of Saltwater Batteries

The perfect innovation has not yet been found. The same applies to saltwater batteries. In addition to the disadvantages, there are some:

The Density of Energy is Lower

This product also has a size limitation. Lithium-ion batteries in a given amount of space store more energy compared to saltwater batteries. Consequently, the need for larger batteries is being created because of low energy density. Batteries with a larger capacity require more material to manufacture.


Because these batteries are lower density, they are more expensive. The fact that they have to make bigger batteries means that manufacturers incur more expenses in the manufacturing process. Compared to lead-acid and lithium batteries, the cost of producing lithium-ion batteries is on the decline. Availability of saltwater batteries will increase after the cost challenge for large-scale production is overcome.

The C-Rate is Limited

It has a C-rate of 0,5 or half that of saltwater batteries. Different batteries can be compared based on their C-rate. Battery capacity influences the amount of charge the battery can hold.

In order for the batteries to discharge their entire capacity at once, only half of it can be discharged. As a result, these batteries are not the best if you are trying to use more energy in a short period of time.

How is the Situation with Saltwater Batteries?


The benefits of saltwater batteries seem too numerous to ignore, so you would think they would be integrated into every solar panel installation and widely utilized for energy storage at the utility level. The situation is not as it seems, and there are a few key reasons.

Its upfront cost - specifically, its price compared to lithium-ion batteries, the established market leader - is the most significant barrier for saltwater batteries to reach the mass market. Compared to lithium-ion batteries, saltwater batteries are just now starting to be explored, though their costs have fallen exponentially over the past few years.

Cost isn't the only issue affecting saltwater batteries, since their size plays a huge role. In comparison to a lithium-ion battery, saltwater batteries are less energy dense, storing less energy in the same amount of space. The downside of this is that, for a given amount of energy, you require a larger battery. And larger batteries are more expensive to produce and use more materials. Cost challenges for saltwater batteries are only going to become more prevalent as lithium-ion battery prices continue to fall. Price is likely to remain the largest barrier to the commercial availability of saltwater batteries until such time that they can be produced at scale.

Despite saltwater batteries' uncertain future, they are still widely used today. The lower energy density of these systems makes them suitable for larger grid storage systems than smaller residential and commercial storage systems because space is not as critical as it is for smaller consumer and business equipment. Any company that wants to make saltwater batteries will face a huge challenge due to these costs.

This technology has its limitations, which experts must address. The C-rate needs to be resolved through more research. The issue of low density must be addressed by manufacturers. In order for batteries to compete with other energy storage technologies, they must be cost-effectively produced at smaller capacities.

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