High self-discharge results in significant energy loss and conversion of active lithium to inactive lithium in the battery. According to the query "The relationship between specific capacity and Coulomb efficiency of supercapacitors", it is known that high self-discharge results in significant energy loss, conversion of active lithium to inactive lithium in the battery and non- annealed. are all reasons why the Coulomb efficiency of supercapacitors is less than 1. The supercapacitor is an energy storage device with high power density, almost instantaneous charging and discharging, high reliability and long life. ultra long.
What is the reason for the low Coulombic efficiency of lithium iron phosphate
During the first cycle of the lithium battery, the electrolyte and the negative electrode material react at the solid-liquid interphase level, so a layer will be formede.
First, the SEI film will protect the negative electrode material, making the material structure less likely to collapse and increasing the life of the electrode material.
Second, the SEI film will consume part of the lithium ions during the production process, and the negative electrode reaction process is actually a lithium ion insertion and extraction process in the carbon interlayer structure. Therefore, the formation of the SEI film will reduce the efficiency of the first cycle of the negative electrode.
Third, the SEI film is produced not only on the negative electrode surface, but also on the positive electrode surface, but the impact is relatively small, so I will not explain it no more here.
In addition, the first cycle efficiency is a very important performance indicator of negative electrode materials. The higher the efficiency of the first cycle, the betterux it is. By coating, spheroidization and surface modification of the negative electrode material, the first cycle efficiency and service life can be significantly increased.
What is the significance of the shuttle effect in lithium-sulfur batteries?
The theoretical life of a lithium iron phosphate battery is 100% DOD (process of full charge and discharge)
Lifespan: 2000 capacity Always maintaining 80%
Talk about the concept of recycling beneficial to Shenma
Use 2000 and continue to use less recycling
It depends on the specific power consumption of Shenma
If the current can continue to be used, it should be thousands of times
< p>The shuttle effect, also called the shuttle effect, refers to the polysulfide (Li2Sx) intermediate produced by the positive electrode dissolving in the electrolyte during the charging and discharging process. He crosses the separater, diffuses to the negative electrode, and directly reacts with the lithium metal in the negative electrode, ultimately causing irreversible loss of effective substances in the battery, attenuation of battery life and low Coulomb efficiency.In order to maintain the shuttle effect, it mainly involves using supports with a high specific surface area and a porous structure (such as graphene, carbon tubes, etc.) on the positive electrode to adsorb and physically trap sulfur. and polysulfides, then in addition, it involves chemically modifying the support and modifying the active sites to obtain chemical adsorption.