Lithium battery manufacturer to explain how to improve the volume energy density of lithium batteries? Energy density refers to the size of the energy stored in a unit of a certain space or mass of material, the energy density of the battery is also the average unit volume or mass of electrical energy released by the battery, the energy density of the battery is generally divided into two dimensions: weight energy density and volume energy density. The following lithium battery manufacturers explain how to improve the volume energy density of lithium batteries?
Lithium battery manufacturers explain how to improve the volume energy density of lithium batteries?
Lithium battery, for example, has advantages in volume energy density, and has the potential and prospect of becoming the mainstream technology for power batteries, but the bottleneck is the relatively low safety of high specific energy power batteries. Some people question the development route of power battery technology because of safety issues.
1. Thin shell, fluid collection, diaphragm, increase electrode compaction density, reduce the amount of binder and conductive agent, and increase the content of active substances in the electrode; but the corresponding will bring some risks: thin shell will make the battery less safe, fluid collection makes the electrode easy to fracture, thin diaphragm leads to the reduction of safety, etc., and increase the electrode compaction density may lead to lower absorption rate and brittle electrode, etc.
2. Mix high-capacity and low-pressure materials with high-pressure materials to form a composite system and improve the compaction density of the composite system.
3. Select positive and negative electrode materials with high specific capacity or high voltage platform positive electrode materials.
Lithium-sulfur batteries are regarded as one of the ideal choices for next-generation high-energy density battery systems, and have received a lot of attention from scientific research and industry around the world, and are one of the key research directions for the future layout of various countries, but as the research continues, lithium-sulfur batteries are facing increasingly serious challenges. The current commercial lithium battery energy density is about 260Wh/kg and 700Wh/L.
The main problem at present is the low bulk energy density, which leads to its loss of competitiveness in many important market applications, while the high electrolyte dosage has also become a bottleneck for its weight energy density improvement. In addition, the safety and long cycle life of lithium metal cathode are not yet well solved. Lithium battery has high energy density. Its volume energy density and mass energy density can reach 450Wh/dm3 and 150Wh/kg, respectively, and is still improving.
Lithium sulfur battery volume energy density is low for the following two reasons: intrinsically, the theoretical density of the active material lithium and sulfur is relatively low, lithium 0.534g/cm3, sulfur 2.07g/cm3, while the theoretical density of materials such as lithium cobaltate and ternary in lithium-ion batteries is much higher.
From the electrode construction, there is another most important reason is that sulfur is an electron and ion insulator, so it is necessary to disperse sulfur into a large amount of conductive carbon with high specific surface area in order to play its capacity, and the problem brought about by using a large amount of conductive carbon is that the specific surface area of the whole cathode is very high, and the porosity is very high, and generally speaking, the porosity of the traditional carbon and sulfur cathode is twice that of the lithium-ion battery cathode.
Lithium batteries are considered by many to have largely reached the ceiling of the theoretical value of energy density. In recent years has said that lithium monomer energy density 165wh/kg, pack 140wh/kg. the next two years planning monomer energy density to more than 180wh/kg, volume specific energy density will be increased by 50%, the pack to 160wh/kg, life up to 8 years 1.2 million kilometers, the cost can also save 30%.
It turns out that there are many models put lithium battery can not be put down, mainly because the lithium battery is too big in the past, but the volume energy density is really a concept more recognized by many industry insiders. From the perspective of the car, the volume energy density of lithium batteries is more important, rather than the weight energy density.
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