The main difference between solid-state batteries and lithium-ion batteries is in the electrolyte. The lithium-ion electrolyte is liquid, in the form of a gel, a polymer, which makes it difficult to lose weight. In addition, a single lithium-ion battery pack is not very powerful, so multiple packs must be connected in series to increase the weight further. The cost of engineering, manufacturing and installing battery packs accounts for a large proportion of the overall cost of electric vehicles.
Solid-state batteries have high safety functions. Traditional lithium-ion batteries use organic liquid electrolytes. Under abnormal conditions such as overcharging and internal short circuit, the batteries are prone to heat, resulting in electrolyte expansion, spontaneous combustion and even explosion, posing serious safety risks. On the other hand, many inorganic solid electrolytes have no problems of non-combustion, no corrosion, no volatilization and leakage. Compared with the liquid electrolytic liquid containing flammable solvent, the safety of the battery has also made great progress.
Solid battery refers to a storage device that contains no liquid in the battery structure and all materials exist in solid form. It is composed of "positive material negative material" and solid electrolyte. Solid lithium battery is an ideal power battery for electric vehicle due to its advantages of good safety performance, high energy density and long cycle life.
It has recorded the long service life of lithium battery, which can reach more than 6 years. The battery with lithium iron phosphate as the positive electrode uses 1CDOD charge and discharge, which can be used for 1000 times. Lithium batteries have strong temperature adaptability, which can be used in the environment of -20--60, and can be used in the environment of -45 after processing.