Jun 12, 2019 Pageview:462
A new type of lithium-ion battery based on water electrolytes has been developed by a team of Chinese scientists, according to the Physicist Organization Network. Not only has the voltage for the first time reached the 4-volt standard required for household electronics such as laptops, but it can completely avoid the fire and explosion risks of existing commercial lithium batteries. The two related papers were published in the recently published "Science" and "Joule" magazines.
Among the existing electronic products, lithium ion batteries use non-aqueous electrolytes. When working, the battery voltage must meet the 4-volt standard, and it is easy to decompose at this working voltage. Therefore, lithium batteries often use organic solvents as electrolytes. However, such electrolytes are flammable and explosive, which may cause electronic products to burst into flames and have great safety. hidden dangers.
The Wangchunsheng team of the University of Maryland developed a hydrolytic battery in 2015, but the voltage can only reach 3 volts, and its electrode performance will be affected by aqueous solutions. This time, Wangchunsheng's team collaborated with scientists such as Xukang of the US Army Research Laboratory to develop this upgraded version of the water-based lithium battery.
The researchers designed a new polymer gel coating. Because of its special drainage, the water molecules can not get close to the electrode surface after coating on the electrode. After the first charge, the gel breaks down to form a stable interface that separates the electrode from the electrolyte and prevents the water molecules from breaking down at working voltage. The technology not only improves the energy storage and charge and discharge performance of the battery, but also completely avoids the danger of organic solvent electrolyte explosion.
Although the operating voltage of the new battery has reached commercial level, there is still a lot of room for improvement compared to existing lithium ion batteries. For example, the material cost of the new battery is high, and it can only be charged and discharged 50 times to 100 times. To have a commercial competitive advantage, the charging and discharging cycle must reach more than 500 times.
However, it is undeniable that the electrochemical treatment method behind the new battery has important reference significance for battery technology such as sodium ion battery, lithium sulfur battery, zinc magnesium multiion battery, as well as electroplating and electrochemical synthesis.
The page contains the contents of the machine translation.
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