Solving the technical bottleneck of lithium cell batteries with ice
Today, with the rapid development of mobile phone technology, the technological development of lithium cell batteries has fallen into a bottleneck period. Unless new and better battery materials or battery technology are found to have a qualitative leap, lithium battery suppliers want to increase battery life by increasing the battery capacity. However, the risk of doing so is high. Samsung is an example. However, researchers who are determined to innovate and change have never given up. Finally, a new solution has been discovered recently, that is, the condensation method, which can ensure the endurance of lithium cell batteries in a safe situation and can be bent. Can be fully adapted to bendable mobile devices that may appear.
So what exactly is the condensation method? In fact, it is very simple, using ice-templating to vertically align the solid electrolyte structure in the battery to enhance conductivity. The birth of this new type of battery is also paving the way for flexible smartphones and tablets in the concept.
At the moment, liquid electrolytes for rechargeable lithium cell batteries on the market are highly flammable and can easily cause safety problems. The culprit of the Note 7 accident last year was it. Therefore, Columbia University's School of Engineering and Applied Sciences decided to try to use solid electrolytes instead of flammable liquid electrolytes.
Because traditional liquid electrolytes are extremely flammable, they use ice stencils to give ceramic solid electrolytes a vertically aligned columnar structure, and batteries using ceramic solid electrolytes are significantly safer and more conductive. The preparation of such lithium cell batteries is also very rare. When making, first add ceramic particles to the bottom and cool the aqueous solution, then let the ice layer grow, extrude a part of the frozen aqueous solution, and let the ceramic particles become in the battery. Mainstream. Finally, create a vacuum environment to sublimate the ice into a vapor state, thus completing the vertical alignment structure. Once the vertical alignment architecture is in place, it needs to be combined with a polymer that is a macromolecule of many repeating subunits that provides mechanical support and flexibility to the electrolyte.
Yuan Yang, an assistant professor of materials science and engineering at Columbia University, mentioned that flexible solid-state lithium cell batteries can solve safety problems once and for all, whether on mobile devices or on electric vehicles, while increasing energy density. In previous experiments, researchers used a variant of the solution. They used randomly dispersed ceramic particles in the polymer electrolyte, and also tried fiber-like ceramic electrolytes, but these solutions could not achieve vertical alignment.
In previous experiments, researchers used a variant of the solution. They used randomly dispersed ceramic particles in the polymer electrolyte, and also tried fiber-like ceramic electrolytes, but these solutions could not achieve vertical alignment. Haowei Zhai, the lead author of the research report, said: "At the time, we thought that by combining the vertical alignment of the ceramic electrolyte with the polymer electrolyte, lithium ions can be turned on the fast lane and enhance the conductivity of the lithium cell batteries." He also said that they believe This is the first time in the industry to use ice stencils to make flexible solid electrolytes. The new electrolytes are not only safe and reliable, but also non-toxic and harmless. The new solution optimizes the conductivity of lithium ions and opens a window for the development of next-generation rechargeable batteries. After switching to solid electrolysis, the graphite layer used in the original lithium cell batteries can be replaced with lithium metal, which can increase the energy of 60~70% of the battery.
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