Why Did BYD Abandon Ternary Lithium Batteries in Favor of Lithium Iron Phosphate?

With the rapid growth of lithium iron phosphate (LiFePO4) batteries in recent years, surpassing ternary lithium batteries in market share, BYD's adoption of LiFePO4 is closely linked to this trend. Currently, BYD's blade batteries are, in fact, based on LiFePO4. While ternary lithium batteries remain the mainstream choice for electric vehicle batteries, the advantages of LiFePO4 cannot be overlooked.

Ternary Lithium Batteries: Ternary lithium batteries boast high energy density, with current mainstream models reaching 220Wh/kg, and projected to reach 300Wh/kg with technological advancements. They also exhibit better performance in fast charging due to their high elemental activity. Additionally, ternary lithium batteries are more resistant to ultra-low temperatures, retaining approximately 70% of their capacity at -20°C compared to around 50% for LiFePO4 batteries.

However, despite their impressive performance, ternary lithium batteries have significant drawbacks. They are prone to safety hazards such as thermal runaway, with a higher risk of combustion and explosion, especially under high temperatures. Furthermore, their lifespan is shorter, typically lasting around 2500 cycles of charge and discharge, compared to 3500 or more for LiFePO4 batteries.

Advantages:

1. High energy density

2. Faster charging

3. Better performance in ultra-low temperatures

Disadvantages:

1. Shorter lifespan

2. Vulnerability to high temperatures

3. Susceptibility to physical impact

Lithium Iron Phosphate Batteries: LiFePO4 batteries, composed of inert elements, offer enhanced safety compared to ternary lithium batteries. They demonstrate remarkable stability even under extreme conditions such as compression and high temperatures, making them inherently safer. Moreover, recent advancements have significantly extended the lifespan of LiFePO4 batteries, with some models retaining approximately 80% of their capacity after 3000-5000 cycles of charge and discharge.

Additionally, LiFePO4 batteries are cost-effective, making them an attractive option for various applications. The structural flexibility and superior strength of BYD's blade batteries further enhance their appeal.

Advantages:

1. Longer lifespan

2. Greater thermal stability

3. Enhanced safety

4. Cost-effectiveness

Disadvantages:

1. Poor performance in ultra-low temperatures

2. Currently lower energy density compared to ternary lithium batteries

In conclusion, safety and durability are paramount considerations for users, making LiFePO4 batteries a compelling choice. With cost advantages and promising future prospects, LiFePO4 batteries are poised for widespread adoption. CTECHI's energy storage products, utilizing automotive-grade LiFePO4 batteries, are committed to providing safe and advanced energy storage solutions for outdoor leisure, home energy storage, emergency preparedness, and disaster relief.