American scientists have found that replacing carbon atoms with boron atoms has greatly improved solid-state lithium-ion battery technology!

APR 16, 2019   Pageview:62

According to foreign media reports, BrandonWood, a scientist at Lawrence Rivermore NaTIonal Laboratory (LLNL), and Mirjana Dimitrievska, a scientist at the National Institute of Standards and Technology (USA), led an international R&D collaboration, and the research team found it in lithium battery electrolyte. If boron atoms (boronatom) are used instead of carbon atoms, the mobility of lithium ions is improved. This feature is attractive for solid-state batteries.


This is an example of the so-called "frustraTION": the dynamics of the system determine that lithium ions will never be satisfied with staying in place, so lithium ions will always be in motion.


Compared to current batteries, solid-state lithium-ion batteries can increase safety, voltage, and energy density. However, solid-state batteries are still in the early stages of development, and so far few commercial solid-state lithium batteries have been achieved.


One of the core barriers to commercialization of solid-state batteries is that there are too few solid electrolyte materials to choose from, which are designed to ensure that lithium ions can move effectively between positive and negative poles.


However, there are many problems with the available materials, some of which have problems with the stability of the materials and others are difficult to process. As for the remaining alternatives, most of them are eliminated because of the slow movement rate of lithium ions, which means that at the time of production, make sure the material is very thin.


The new study focuses on the new material, closed borates, which has recently been found to have a faster lithium ion flow rate. According to Wood, the electrochemical properties of the material are stable and easier to process. Compared with other materials, its advantages are more.


Although there are some barriers to commercialization, thermal stability, mechanical strength, and cyclicity are high, which is precisely the focus of the team's attention. The new material is attractive and may be used in the future to replace today's solid electrolyte materials.


The electrolyte material is a salt material that contains positively charged anhydrous lithium chloride and negatively charged closed boric acid anions. The study showed that the closed boric acid anion can quickly complete the readjustment of its position, hover within the solid Matrix, and alternate displacement according to a specific priority orientation.


If carbon is added to the closed boric acid anion, a so-called dipole is generated, which will repel lithium ions in the nearby carbon atoms. With the speed of the anion, the carbon atoms will face different positions, each time forcing the lithium ions in the solid matrix to move to the nearby area. Since this type of salt is a galloping anion, the flow speed of lithium ions becomes very fast.


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