BYD shifts focus to low-cost sodium batteries for energy grids

Chinese battery giant BYD is carving out a distinct niche in the rapidly evolving sodium-ion battery industry, focusing on large-scale energy storage systems while rival CATL pushes the technology into passenger vehicles.

According to industry data released in June 2026, CATL and Changan Automobile have launched a mass-produced electric vehicle powered by a 45-kWh sodium-ion battery pack, Chinese media reports.

BYD, however, is directing its third-generation sodium battery technology toward stationary energy storage, aiming to reduce manufacturing costs to just 0.3 yuan ($0.04) per watt-hour by 2027.

The company's strategy centers on a 189Ah, 2.9-volt sodium-ion cell based on a polyanion sodium iron phosphate chemistry, commonly known as NFPP. While the chemistry offers advantages in durability and safety, its widespread adoption has been limited by extremely low intrinsic electrical conductivity.

BYD says it has addressed this challenge through a dual-modification approach. The company reduces active material particles to nanoscale dimensions, shortening electron transport distances, while applying carbon coatings that significantly improve conductivity. Together, these measures boost electrical performance by several orders of magnitude.

Industry research suggests the technology is particularly suited to grid-scale applications. Data from a June industry report indicates NFPP cells demonstrate strong thermal stability and lower gas generation compared with alternative sodium-ion chemistries, making them attractive for densely packed commercial and utility-scale storage installations.

The batteries are also designed for longevity. BYD targets more than 10,000 charge-discharge cycles, which could translate into operational lifespans exceeding three decades under standard grid-use conditions. Such durability is increasingly valued as countries expand renewable energy capacity and seek cost-effective storage solutions.

Despite growing interest in sodium-ion technology, industry analysts note that supply chain challenges remain. Hard carbon anodes, a critical component in sodium batteries, still lack standardized manufacturing processes, contributing to inconsistent production yields and limiting cost competitiveness with established lithium iron phosphate (LFP) batteries.

Financial projections cited by industry researchers suggest sodium-ion batteries may not achieve full cost parity with LFP technology until 2027.

The divergence between BYD and CATL highlights the emergence of a multi-chemistry battery market. While lithium-based batteries continue to dominate high-performance transport applications, sodium-ion technology is increasingly being positioned for specialized roles, including grid storage, heavy industry and infrastructure projects where safety, durability and low costs outweigh energy-density requirements.

As China's battery leaders pursue different paths, sodium-ion technology appears poised to become an important complement rather than a replacement for lithium-based systems.

By Aghakazim Guliyev