What is the development trend of solid state fast charge lithium ion batteries?

A few days ago, Toyota and Renault / Nissan / Mitsubishi Alliance respectively stated that the goal is to launch electric vehicles using solid-state batteries between 2022 and 2025. At the end of last year, Ganfeng lithium-ion industry also announced that it will build the first-generation lithium-ion battery research and development pilot production line.

Subverting traditional technology, solid state batteries become a new pet

"Solid state batteries that combine high energy density and high security are not only an ultimate goal of battery technology, but have become a global phenomenon. On March 21, Dr. Ctocheyong, deputy general manager of Enli Energy Technology Co., Ltd., told the science and technology daily reporter.

Solid state batteries refer to energy storage devices that do not contain liquids in the battery structure and all materials exist in a solid state. They consist of "positive electrode materials + negative electrode materials" and solid electrolytes. Lithium solid battery has the advantages of good safety performance and long cycle life of Gaohe. It is an ideal power battery for electric vehicles.

Compared to the 150-year-old lead-acid batteries, the lithium-ion batteries that entered industrialization in 1991 using organic electrolytes are still the most advanced batteries on the market.

"With the rapid development of modern materials science and manufacturing technology, the battery technology in the post-lead lithium era has quietly come. "In the near future, solid state batteries will enter our society with a solid step and change our lives," Cheyong said. "

Che Yong explained that solid-state batteries have very significant advantages. Since solid-state electrolytes replace the organic electrolytes that may burst in traditional lithium ion batteries, this solves the dilemma of high energy density and high safety, which will eliminate the users of electric vehicles. "Life anxiety", It is even expected to achieve rapid charging.

So far, thanks to the continuous efforts of scientists, solid-state battery technology has no insurmountable technical bottleneck, but there are still technical problems to be solved. "The core technology of solid state batteries is solid electrolyte material technology that achieves high Ionic conductivity and advanced manufacturing technology that realizes low impedance solid-solid interface. "Che Yong further explained. In terms of solid electrolyte materials, Professor Kanno of the Tokyo Institute of Technology in Japan invented the sulphide solid electrolyte with Ionic conductivity > 10-2S / cm(beyond the traditional organic electrolyte) at room temperature in 2011.

Cheyong said the technology has become the technological basis for Toyota, the leading company in the industrialization of solid-state batteries. Compared with sulphide solid electrolytes, oxide solid electrolytes are more advantageous in terms of high safety and productivity, but the improvement of Ionic conductivity at room temperature is still a problem in the century.

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