Research on polymer solid - state lithium battery
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2020/12/11 09:53:31
Solid polymer electrolytes, also known as ionic conductive polymers.Solid polymer electrolyte has good film-forming property and can be used as electrolyte of lithium ion battery.Solid polymer electrolytes are widely used in electronics, medical treatment, space technology, electrochromatics, optoelectronics, sensors and so on.
In recent years, rechargeable lithium-ion batteries with high capacity, high voltage, long cycle life and low self-discharge have attracted wide attention and been regarded as excellent energy storage devices.However, due to the growth of lithium dendrites during use and the potential safety risks of organic liquid electrolyte used, the use of lithium dendrites in portable equipment and electric vehicles is limited.Therefore, compared with liquid electrolysis liquid phase, solid polymer electrolyte with high safety performance has been developed rapidly.At the same time, in all-solid-state batteries, it is expected to be combined with high-capacity lithium metal (3860 mA·h/ G −1) as the negative electrode, which can greatly improve the energy density of solid-state batteries.
On January 19, 2021 by the Chinese powder, Chinese society of the host, the energy particle materials branch of the changsha institute of mining and metallurgy research institute of advanced materials assisted the second key material ratio to solid state battery technology conference will be in changsha, the international exhibition held a grand hotel, at the appointed time, professor Liu Yulong will bring the report "the research of the solid-state lithium polymer battery", forum guests share related research results.
PEO is one of the most widely studied polymer matrix materials in recent years.Its dielectric constant is high (r ≈ 5) and its ability to dissolve lithium is strong.However, due to low ionic conductivity (≈ 10-7s /cm-1) at room temperature and narrow electrochemical window (& LT;Defects such as 4.0V vs. Li+/Li) greatly limit their use.In order to overcome the above problems, the research group proposed a variety of strategies to improve PEO electrolytes, such as the synthesis of cross-linked polymers;Adding inorganic particles into the polymer;Block copolymers and other methods were synthesized.The electrochemical performance of the modified solid electrolyte can be improved.
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