Chemical power has become an indispensable energy storage method for people. In the current chemical battery system, the lithium battery is considered to be the most promising energy storage device due to its high energy density, long cycle life, and no memory effect. At present, traditional lithium-ion batteries use organic liquid electrolytes. Although liquid electrolytes can provide higher ionic conductivity and good interface contact, they cannot be safely used in metal lithium systems. They have low lithium ion migration and are easy to leak. Problems such as volatile, flammable, and poor safety hinder the further development of lithium batteries. Compared with liquid electrolytes and inorganic solid electrolytes, all-solid polymer electrolytes have the advantages of good safety performance, flexibility, easy processing into films, and excellent interface contact. At the same time, they can also inhibit the problem of lithium dendrites. At present, it has received extensive attentionAt present, people have higher and higher requirements for lithium-ion batteries in terms of safety and energy density. Compared with lithium-ion batteries of traditional liquid organic systems, all-solid-state lithium batteries have huge advantages in this regard. As one of the core materials of all-solid-state lithium batteries, all-solid-state polymer electrolytes are one of the important development directions of all-solid-state lithium battery research. To successfully apply all-solid-state polymer electrolytes to commercial lithium batteries, it should meet the following requirements Several requirements: room temperature ion conductivity is close to 10-4S/cm, lithium ion migration number is close to 1, excellent mechanical properties, electrochemical window close to 5V, good chemical thermal stability, and environmentally friendly and simple preparation method.
Starting from the mechanism of ion transport in all-solid polymer electrolytes, researchers have done a lot of modification work, including blending, copolymerization, development of single-ion conductor polymer electrolytes, high-salt polymer electrolytes, adding plasticizers, Carry out cross-linking and develop organic/inorganic composite system. Through these research work, the overall performance of the all-solid polymer electrolyte has been greatly improved, but it can be seen that the all-solid polymer electrolyte that can be commercialized in the future must not be obtained through one modification method, but multiple modification methods. Compound. We need to understand the modification mechanism more thoroughly, choose the appropriate modification method for the wrong occasion, and develop an all-solid polymer electrolyte that can truly meet the needs of the market.
Post time: Sep-24-2021