On May 27, Ningde Times said in an institutional survey that the company has been in the research and development of solid-state batteries for many years, and is currently in the first echelon. The company can already make solid-state battery samples, but there is still a long way to go before the commercialization of solid-state batteries. A long way to go.
my country’s new energy vehicle manufacturers currently mainly use liquid batteries. However, relying on the existing ternary batteries in the next five years, it is difficult to achieve the energy density higher than 350Wh/kg and cannot meet the national requirements. In addition, in the process of switching from lithium iron phosphate to high-nickel ternary, many car companies experienced battery spontaneous combustion accidents.
Solid-state batteries can address energy density and safety issues. The biggest difference between solid-state batteries and the current mainstream traditional lithium-ion batteries is the electrolyte, which uses a solid electrolyte to replace the electrolyte and separator of traditional lithium-ion batteries. Liquid lithium and solid-state batteries replace liquid electrolytes with solid electrolytes, which greatly reduces the risk of thermal control.
Solid-state batteries have the following advantages:
Solid-state batteries replace liquid electrolytes with solid-state electrolytes, greatly reducing the risk of thermal runaway.
The electrochemical window of solid-state batteries can reach more than 5V, which is higher than that of liquid lithium batteries (4.2V).
The solid-state battery can simplify the packaging and cooling system, further reduce the battery weight in a limited space, and the volumetric energy density is more than 70% higher than that of the liquid lithium battery (graphite negative electrode), reaching 500Wh/kg
However, solid state batteries also have certain disadvantages. For example, its fast-charging performance is poor, and physical contact deteriorates during cycling, affecting its lifespan. In addition, the preparation process of solid-state batteries is also very complicated.
Ningde Times published two patents on solid-state batteries in January this year, namely “a preparation method of a solid electrolyte” and “a sulfide solid electrolyte sheet and its preparation method”. In addition, CATL also revealed at the recent shareholders meeting that it will release sodium-ion batteries around July this year. Na-ion batteries may become a supplementary solution to lithium batteries due to their low-cost advantages of abundant raw material reserves and easy access.
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