Can CR2016 battery solve the safety problems of electric vehicles? What technical bottlenecks has its development encountered?

　　As the heart of electric vehicles, power batteries have attracted as much attention as the current hot new energy vehicles. Among them, lithium-ion batteries are favored by the new energy automobile industry because of their high energy density, low self-discharge rate, high cycle efficiency, and long cycle life, and have huge market development potential.

　　However, the current lithium-ion battery technology is not yet mature, and the problem of unstable safety still exists. In addition, the frequent battery fire accidents have been irritating the nerves of consumers, and the development of solid-state battery technology may be a key to solving the problem of electric vehicles. New options for security issues.

　　➤Solid electrolytes become a trend

　　The cost of lithium-ion batteries used now is relatively high and the technology is immature. There are many potential safety hazards in the lithium-ion batteries produced. Wang Zhenbo, a professor at Harbin Institute of Technology, said.

　　It is understood that large-scale power battery accidents have occurred frequently in recent years, largely due to the use of liquid electrolytes inside the batteries. Safety is very critical for lithium-ion battery energy storage. Li Liangliang, associate professor at the School of Materials Science and Engineering at Tsinghua University, emphasized that commercial lithium-ion batteries currently on the market generally use organic liquid electrolytes. Its disadvantages are that it is easy to burn and may leak liquid, causing environmental pollution.

　　➤Technical bottlenecks are difficult to break through

　　High safety is the basis and prerequisite for the application of energy storage batteries, and solid-state technology is the best way to solve the safety problem of secondary batteries. Solid-state lithium batteries have entered a stage of accelerating global layout and research and development, and many well-known institutions are developing solid-state lithium batteries. Wen Zhaowei said.

　　At present, many battery and automobile manufacturers, including South Korea's Samsung, Japan's Toyota and my country's CATL, have increased their investment in solid-state battery research and development, and some batteries have entered the vehicle installation and testing stage. Although the prospects are promising, the road to developing CR2016 battery is by no means smooth sailing due to various technical and process problems.

　　Efficient electrolyte material systems are lacking. Wen Zhaowei pointed out that solid-state battery materials are currently developing rapidly, but comprehensive applications are lacking. As the core material of CR2016 battery, there has been a breakthrough in the single indicator of solid lithium-ion conductors, but the comprehensive performance cannot yet meet the needs of large-scale energy storage. In this regard, Dong Shanmu also believes that the solid-state electrolytes used in today's CR2016 battery generally have performance shortcomings, and there is still a big gap between the requirements of high-performance lithium-ion battery systems.

　　➤New technologies emerge one after another

　　For CR2016 battery, we need to conduct research from the most basic materials, interfaces, and monomers to the final system modules. Only by fundamentally solving the key material and interface issues can we carry out systematic process research to meet the requirements of single cells. Performance requirements. Wen Zhaowei said.

　　In the face of continuous challenges in the development process, various new technologies are contending, and some solid-state battery technologies have made the latest breakthroughs.

　　For example, in terms of solid electrolyte materials, the industry has found that CR2016 battery based on the garnet-structured lithium lanthanum zirconium oxygen (LLZO) solid electrolyte system have excellent cycle performance and rate performance, and it has therefore become a major technical hotspot. LLZO is an excellent filler that can improve the performance of polymer-based composite solid electrolytes. The LLZO-based solid-state battery can still maintain 81% capacity after 1,000 cycles. Li Liangliang introduced.

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