Salt of the Earth: The Rise of CATL’s Sodium-Ion Batteries

Introduction

The global race for sustainable energy is shifting gears. While lithium has long been the undisputed king of batteries, a new contender is emerging from the labs of CATL (Contemporary Amperex Technology Co., Limited): the Sodium-ion battery.

What is it?

At its core, a Sodium-ion battery works similarly to the lithium-ion batteries in your phone or laptop.

However, instead of using scarce lithium, it utilizes sodium, the primary element in common table salt. CATL’s first-generation cells use a specialized Prussian blue analogue material for the cathode and a unique hard carbon for the anode, allowing sodium ions to move freely

Why is it preferred?

The shift toward sodium is not just about being different, but it has many strategic advantages:

• Abundance & Cost: Sodium is found everywhere, making it significantly cheaper and less prone to the “lithium-price-rollercoaster.”
• Cold Weather Hero: Unlike lithium batteries that “hibernate” in winter, CATL’s sodium cells retain about 90% of their capacity at -20°C.
• Rapid Charging: These batteries can charge to 80% in just 15 minutes, rivaling the fastest chargers on the market today.
• Safety: They are thermally stable and can be transported at “zero volts,” making them much safer to ship than their lithium counterparts.

What are the Challenges?

It isn’t all smooth sailing. The main hurdle is Energy Density. Sodium ions are larger and heavier than lithium ions, meaning they store less energy in the same amount of space. While CATL has achieved an impressive 160–175 Wh/kg, it still trails behind high-end lithium batteries, making it more suitable for budget cars or stationary energy storage.

What to Look Forward To?

We are currently entering the “Multi-Power Era.”

CATL has already launched the Naxtra brand and is integrating these cells into “AB” battery packs” – mixing sodium and lithium cells in one vehicle to get the best of both worlds.

As mass production scales in 2026, expect to see sodium-ion batteries powering everything from affordable electric hatchbacks to massive grid-storage facilities that keep the lights on when the sun goes down.