After the rapid development of the lithium battery industry for more than ten years, scientists have discovered that the development potential of the material system is becoming more and more limited, and technological development has entered a bottleneck period.

　　The existing cathode materials cannot give consideration to both safety and energy density. The negative electrode material has not yet found the best material to replace graphite, and the most potential silicon material has the fatal problem of large expansion coefficient.

　　The development direction of the electrolyte is to focus on changing the battery from liquid to solid in order to take into account safety and energy density, but the technology is still immature.

　　The in-depth technological development of lithium batteries has been in trouble, so where is the new way out?

　　The optimization of packaging technology is the most rational solution under the existing conditions. BYD's blade battery is a typical representative. The remaining space that the packaging technology can squeeze is very limited, and it requires a better battery management system to function.

　　In the future, there are two potential directions that are expected to achieve breakthrough development in lithium battery technology:

　　Sodium ion battery

　　A sodium-based battery (SIB) is a rechargeable battery that uses sodium ions (Na+) as a charge carrier. Sodium ion batteries are suitable for large-scale energy storage devices because of the better safety properties, abundant reserves and low price of sodium. The disadvantage of sodium-based batteries in terms of energy density makes it difficult to impact power batteries.

　　Hydrogen energy battery

　　Hydrogen has high energy density, large system capacity, and no need to charge. But the industrial chain of hydrogen energy is a long and complex chain. The cost of hydrogen production, hydrogen storage, and hydrogen transportation is high, infrastructure investment is large, and stability is insufficient. The advancement of the hydrogen energy battery industry takes time.

　　Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate batteries are a perfect replacement for lead-acid batteries, and they are the first choice for grid-connected peak shaving, off-grid energy storage, photovoltaic energy storage, UPS, data center and other industries.

　　Changes in lithium battery technology innovation, process optimization, and management changes will have an impact on specific technical routes, but the overall development will continue.