Physicists network reported that the United States team of Chinese scientists developed a new type based on aqueous electrolyte for lithium ion batteries, not only the voltage for the first time to laptop computers and other home electronics required standard of 4 v, and can completely avoid the existing commercial lithium-ion batteries of fire and explosion danger.The two papers are published in a recent issue of the journal science and joule.
Lithium-ion batteries in existing electronics use non-aqueous electrolytes.Work, battery voltage must satisfy the standard of 4 v, and in the working voltage water easy to decompose, lithium batteries commonly used organic solvents as the electrolyte, but this kind of electrolyte flammable and explosive, could lead to fire explosion of electronic products, there is great potential safety hazard.
Wang chunsheng, of the university of Maryland, developed a hydro-electric solution battery in 2015, but the voltage could only reach 3 volts, and the electrode performance would be affected by the water solution.This time, wang chun-sheng's team, together with scientists from the us army research laboratory, xu kang, collaborated on the development of the upgraded version of the water-based lithium battery.
The researchers designed a new type of polymer gel coating, because of its special drainage, the water molecules could not get close to the surface of the electrode when applied to the electrode.After the first charge, the gel breaks down into a stable interface, isolating the electrode and the electrolyte, preventing the water molecules from breaking down under the working voltage.The technology not only improves the energy storage and discharge performance of the battery, but also avoids the danger of explosive electrolyte.
Although the working voltage of the new battery has reached the commercial level, there is still a lot of room for improvement compared with existing lithium-ion batteries.For example, the new battery has a high material cost and can only charge and discharge 50 times to 100 times. The charging cycle must be more than 500 times in order to have a commercial competitive advantage.
But it is undeniable that the electrochemical process behind the new battery, for sodium ion batteries, lithium sulfur batteries, zinc magnesium ion battery cell technology, and areas such as electroplating and electrochemical synthesis, has important significance.