Cornell University's Solid State Battery Technology Breakthrough Use Cycle Charging Speed Double Upgrade

- Oct 22, 2019-

People's requirements for batteries are not high: they provide energy for as long as needed, charging is fast, and there is no sudden fire, but a series of cell phone battery fires in 2016 shook consumers' lithium-ion batteries. confidence. Since its introduction in the 1980s, lithium-ion batteries have helped lead the development of modern portable electronics, but have been plagued by security issues. As people become more interested in electric vehicles, researchers and industry insiders are looking for technologies to improve rechargeable batteries that need to be able to safely and reliably power cars, self-driving cars, robots and other next-generation devices. According to foreign media reports, a new study by Cornell University in the United States has improved the design of solid-state batteries. Solid-state batteries are inherently safer and have higher energy densities than existing lithium-ion batteries, which rely on flammable liquid electrolytes to rapidly transfer chemical energy stored in molecular bonds to electrical energy. Cornell researchers have turned liquid electrolytes into solid polymers inside electrochemical cells, taking advantage of liquid and solid properties to overcome the current critical limitations affecting cell design. QingZhao, a postdoctoral researcher and lead author of the study, said: "Imagine a glass filled with ice cubes. Some ice cubes will touch the glass, but there are also gaps. But if the glass is filled with water and frozen, the interface It will be completely covered, and a strong connection between the ice cubes in the glass and the water can be established. The same concept can be used in the battery to promote the high rate transfer of ions to the electrolyte on the solid surface of the battery electrode without the need for flammability. Liquid.” The key to this solution is the introduction of special molecules that initiate polymerization in the electrochemical cell without compromising other functions of the cell. If the electrolyte is a cyclic ether, an initiator can be designed that tears the ring to create a reactive monomer chain that is bonded together to produce a long chain molecule that is substantially chemically identical to the ether. These sturdy polymers remain tightly connected at the metal interface, like ice in a glass. In addition to helping to improve battery safety, solid electrolytes help next-generation batteries use metals such as lithium and aluminum as anodes, enabling greater energy storage than today's most advanced battery technologies. In this case, the solid electrolyte prevents the metal from forming dendrites, resulting in short circuit, overheating, and failure of the battery. Despite the obvious advantages of solid-state batteries, mass production has been hampered. High manufacturing costs and poor interface performance due to previous designs have created significant technical hurdles. In addition, solid-state systems are able to stabilize battery thermal changes, eliminating the need for battery cooling. According to the researchers, the field technology for the production of new polymer electrolytes is expected to extend the cycle life of high energy density rechargeable metal batteries and increase the charging capacity.