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What is a Sodium-ion Battery? And What are the advantages and disadvantages of Sodium-ion Battery?

Contemporary Amperex Technology Co., Ltd. (CATL Battery) launched the first-generation sodium-ion battery with the world's highest energy density of 160Wh/kg on July 29, which attracted great attention from the battery industry; and what is a Sodium-ion Battery? And What are the advantages and disadvantages of Sodium-ion Battery?

What is a Sodium-ion Battery?

The sodium-ion battery has a similar working principle to the lithium-ion battery. Sodium ions also shuttle between the cathode and anode. However, compared with lithium ions, sodium ions have a larger volume and higher requirements regarding structural stability and the kinetic properties of materials. This has become a bottleneck for the industrialization of sodium-ion batteries.

Advantages of sodium-ion batteries:

sodium resources are more abundant, and the global distribution is even; the cost of sodium-ion batteries is about 30% lower than that of lithium batteries, and the cost advantage is obvious; sodium-ion batteries are safer and are not easy to produce lithium dendrites.

Disadvantages of sodium ion batteries:

lower energy density of sodium ion batteries; short cycle life; and the industrial chain is still incomplete.

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Sodium-ion vs. Lithium-ion Battery: Which is a Better Alternative?

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Lithium is the most common element in battery manufacturing, with China controlling the global lithium-ion battery supply chain (79% of all lithium-ion batteries). China also controls 61% of global lithium refining capacity used for battery storage and electric cars.

The next big supplier is Argentina, accounting for 21% of global deposits, giving it tremendous power in raw material mining and to influence the lithium supply chain, with 13 proposed projects and dozens more in the works.

Lithium-ion batteries are made of scarce and pricey elements such as cobalt and lithium. Lithium prices have increased by more than 700% since amid rising demand for batteries. Lithium-based batteries would likewise have difficulty meeting the increasing demand for power grid energy storage. Technology companies are looking for alternatives to replace traditional lithium-ion batteries.

Sodium-ion vs. Lithium-ion Battery Technology

Sodium-ion batteries are a promising alternative to lithium-ion batteries &#; currently the most widely used type of rechargeable battery. Both types of batteries use a liquid electrolyte to store and transfer electrical energy, but differ in the type of ions they use.

An examination of Lithium-ion (Li-ion) and sodium-ion (Na-ion) battery components reveals that the nature of the cathode material is the main difference between the two batteries. Because the preparation cost of the cathode from raw materials is the same for both types of battery technologies, the main cost reduction for sodium-ion batteries comes from raw materials.

Due to the multiple advantages of sodium-ion batteries, large players in the energy industry are investing in acquiring and developing this technology. For example, Faradion, a battery technology company in the UK and an innovator in Na-ion battery, was recently acquired by Reliance New Energy Solar, a subsidiary of Reliance Industries, for $135 million.

Challenges for Sodium-ion Battery

Despite the advantages, sodium ion battery manufacturing needs to overcome several challenges before it can be widely adopted as a replacement for lithium-ion batteries.

• Lack of a well-established supply chain for the materials used in the batteries.
• Since the technology is still in its infancy, very few companies operate in this segment, leading to higher cost of batteries.
• The technology to make sodium-ion batteries is still in the early stages of development.
• Sodium-ion based batteries have limitations of flexibility as they cannot be turned into various shapes like prismatic, cylindrical etc.
• These are less dense and have less storage capacity compared to lithium-based batteries.
• Existing sodium-ion batteries have a cycle life of 5,000 times, significantly lower than the cycle life of commercial lithium iron phosphate batteries, which is 8,000-10,000 times.

Can Sodium-based Batteries Replace Lithium-ion Batteries?

While there are many potential advantages to using sodium-ion batteries over lithium-ion batteries, there are also several challenges that need to be overcome before they can be widely adopted as a replacement.

If sodium-ion batteries are to become the backbone of the energy storage industry, they must continue to improve their technical performance. Researchers are working to improve the performance and stability of the batteries, as well as to reduce their cost, while companies are looking to establish a supply chain for the materials used in the batteries.

Author: Sanket Chipade

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