Scientists from Zhejiang University used graphene films as cathode materials to develop a new type of aluminum-graphene battery. This kind of battery has a long life and can be fully charged in a very short time. It can work normally in the temperature range from minus 40°C to 120°C. This innovation has pointed out an important direction for the practical use of aluminum ion batteries.
The aluminum ion battery is an excellent new battery. The key to its practical application is to find a suitable positive electrode material. The super group of professors from the Department of Polymer Science and Technology of Zhejiang University chose graphene as the magic material and created a unique graphene film as a positive electrode material with an innovative process, which greatly improved the overall performance of the aluminum ion battery, compared with the current mainstream lithium battery and super capacitor. The prospect of contending is very good. Related papers were published in the internationally renowned journal "Science Progress".
"Battery capacity is shown by its battery life. Generally, the battery will continue to decrease with repeated charge and discharge. This is what we call 'durability'." Gao Chao said, "Aluminum-graphene battery at this point The performance is excellent. The battery has undergone 250,000 charge-discharge cycles, and the charge and discharge efficiency is still as high as 91%, and the capacity loss is small. That is, if the smart phone uses such a battery, even if it is charged 10 times a day, It can last for nearly 70 years.
The rate performance of this aluminum-graphene battery is also excellent, as it can be quickly charged at high current while maintaining a high specific capacitance. “Some smart phones now have a fast charge function. It seems that the battery is very full and the actual battery life is not long.” Gao Chao said that the current laboratory data of this new type of battery will be fully charged in 1.1 seconds. Minor loss. "If you use a mobile phone in the future, it's entirely possible to charge 5 seconds to talk for 2 hours."
"Aluminum-graphene batteries do not lose supercapacitors in terms of rate performance and cycle life, and are far more than lithium batteries. Although there is still a gap between lithium-ion batteries and energy density, they are obviously more than supercapacitors." Gao Chao said that in the face of lithium batteries and The two rivals of supercapacitors, aluminum-graphene batteries showed a specific advantage, which can be called "super battery."
Aluminum-graphene batteries also have some unmatched features of other current batteries. From low temperature to minus 40°C, the aluminum-graphene battery can still be charged and discharged 1000 times, high temperature to 100°C, and stable charging and discharging 45,000 times. Even if the battery core is exposed to flame, it will not catch fire or explode. This wide temperature range of use lays the foundation for the future use of aluminum-ion batteries under extreme temperature conditions. The battery is also very flexible and retains its capacity after 10,000 flexes, demonstrating its potential for application in wearable flexible electronic devices.
The superior performance of the "super battery" stems from the excellent microstructure of the graphene film as a positive electrode material and the macroscopic performance it exhibits. The excellent performance of many important batteries depends on how well electrons and ions can smoothly flow between the positive and negative electrodes. Compared to other cathode materials, the graphene films prepared by the Gaochao Group have high quality, no lattice defects, high degree of orientation, and have continuous channels. They are just like highways extending in all directions, allowing electrons and ions to flow freely.