BYD is focusing its third generation polyanion sodium battery platform on stationary energy storage rather than passenger vehicles. The company targets a manufacturing cost of 0.3 yuan (0.04 USD) per watt hour by 2027 using a 189Ah heavy duty cell architecture. This contrasts with CATL which has put sodium batteries into mass produced cars. The article details how BYD overcomes the low conductivity of polyanion chemistry through nanofabrication and carbon coating. The resulting cells achieve over 10,000 cycles with a 33 year operational life. The main bottleneck remains hard carbon anode supply which is fragmented and lacks standardized processing. Full cost parity with lithium iron phosphate is not expected until 2027.
