- Polymer: easy to process, withstands high voltage, has low preparation cost, and the technology is relatively mature; but the ionic conductivity and cycle life need to be improved, the interface resistance is high, and it is easy to be brittle;
- Oxide: The conductivity is higher than that of polymers, and the withstand voltage is high, but the interface resistance is high, the solid contact will continue to deteriorate, and it is sensitive to air. The four major representative companies in China: Qingtao, WELION, ProLogium(TAIWAN), and GANFENG
- Sulfide: highest conductivity and energy density, good contact, easy to process, but narrow temperature range(60-85℃), The major representative companies: CATL, SAMSUNG, SOLIDPOWER
- Polymer: Thermal stability is below 200°C, and fire and combustion may occur at high temperatures. This does not solve the problem of safety performance. Therefore, although polymers were the first to promote commercial application among the three technical routes, they have not been used until now. It has been rolled out on a large scale, so most European car companies have turned to investing in US start-up solid-state battery companies;
- Oxide: Oxide is very hard, the "solid contact" problem is very serious, the porosity is high, and the oxide particles exist in the form of point contact. If we make it with oxide under simple cold pressing at room temperature The all-solid-state battery will be a very high porosity battery. In a liquid battery, all pores are wetted with electrolyte, so there is no problem with interface contact, but in a solid-state battery, these pores cannot conduct lithium. This core problem makes the oxide system unlikely to be an all-solid-state battery, usually a solid-hybrid battery;
- Sulfide: The thermodynamic stability is very poor. How to maintain high stability is a big problem. One solution is to apply an external coating, but this increases the resistance of the battery. In addition, sulfides still cannot avoid the generation of lithium dendrites.
