How to improve the cycle of charge discharge cycles for a new type of lithium negative battery
Publish：Sino Energy Corporation Time：2017-07-18
NASA‘s Jet Propulsion Laboratory has developed a new type of lithium anode electrochemical cell, which increases the number of cycles of charge discharge in rechargeable lithium batteries. Although the old two stage lithium battery has better storage performance, but the cycle life is shorter, because the composition of the lithium battery is not compatible with the physical and chemical properties, and after several cycles, the cathode is easy to decompose.
The new lithium battery uses a material compatible with the electrolyte, which is moist and chemically stable. The dielectric has low evaporation capacity and good electrochemical stability, thus improving the packaging and security of the battery. Furthermore, the battery can be operated at a moderate temperature below 100 DEG C and thus suitable for motor vehicles, communications, and many other aspects.
In addition to the lithium anode, the new lithium battery has two titanium sulfide cathodes and electrodes made of LIA3F6.
The dispenser is coated with a surfactant and a formula of a specific binding force in the cathode, compatible with the new electrode. The results show that the cycle life of the battery is 2 times as good as that of the battery.
The sulfone based dielectric solution, such as 3MeS, is a heterocyclic compound. These compounds are chosen as dielectric solutions because they have stronger antioxidant and anti reductive effects than the commonly used 2MeTHF dielectric solution.
In addition, the dielectric fluid has the characteristics of low melting point, high boiling point, so the use of wide temperature. But at the same time, they are extremely polar, and can not make the non-polar material of the dispenser moist. Therefore, on the surface of the dispenser, it needs to be coated with "wow" or "Silicon - B two" as a surface activator. These substances allow the dielectric fluid to become liquid, without affecting the stability of the electrode.
In order to improve the mechanical stability of the cathode, ethylene vinyl chloride (PVC) is used as a binder to replace Teflon used in the past. Since the electrolyte does not make the material moist, it is necessary to add sulfone compounds to maintain its wettability.
