All-solid-state lithium battery comes out: the energy density doubles through the deep-sea test

by:CTECHi     2021-08-17

The reporter learned from a related meeting held by the Qingdao Institute of Bioenergy and Processes of the Chinese Academy of Sciences that the recently successfully developed high-energy-density, high-performance all-solid-state lithium battery has just passed the 11,000-meter full-sea depth simulation pressure chamber cycle Stress testing is expected to become the ideal energy power for all-sea deep submersibles such as 'Jiaolong' in the future.

It is understood that traditional liquid lithium batteries have potential safety hazards that are easy to leak, catch fire and explode, while the comprehensive performance of ordinary solid lithium batteries cannot be considered. Relying on the Qingdao Energy Storage Industry Technology Research Institute's Ru0026D team, under the guidance of Academician Chen Liquan and Researcher Cui Guanglei, a series of all-solid polymer electrolytes with excellent comprehensive performance have been developed to solve the above-mentioned bottleneck problems.

The study found that the electrochemical window of the new all-solid electrolyte membrane can be as high as 4.6V, and the thermal stability temperature of the electrolyte can reach at least 200℃. In the case of lithium-ion batteries, after 1000 long cycles of charging and discharging, it still maintains 92% of its capacity. Even when researchers perform corner cutting and nail penetration tests on this solid-state battery, it can still be charged and discharged normally.

The successful development of this all-solid polymer electrolyte with high thermal dimensional stability, excellent mechanical strength, wide electrochemical window and high room temperature ionic conductivity will enable lithium ion The battery electrolyte can be seamlessly combined with electrode materials of various shapes, and it is expected to be widely used in the manufacture of lithium power batteries for electric vehicles. According to the scientific research personnel of the Institute of Energy, this kind of solid-state battery will not cause safety accidents such as fire and explosion even under extreme conditions such as collision and extrusion of the car and high temperature.

Furthermore, because this scientific research result has doubled the energy density of lithium batteries, the cruising range of electric vehicles is expected to increase to more than 450 kilometers, and the application prospects are extremely broad. Its excellent pressure resistance will also greatly promote the development of electric vehicles, spacecraft and deep-submersible vehicles.

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