Grinding is very important for lithium ion batteries. If the product is good, but high quality cannot be guaranteed during grinding, it will affect the life of the battery. Dry and wet grinding are very important for batteries.
Dry grinding and wet grinding are two different processes. There are three important points in the dry grinding process:
The first is humidity, because this will affect the final performance of the product, so we must reduce its humidity.
The second is metal pollution. We must closely control this link to ensure the purity of the metal. If the metal is not pure, it may form crystals, which will cause a short circuit and even fire.
The third point is to strictly control the grinding state. Sometimes we will see that some manufacturers cannot achieve the best working environment, which will cause stagnation in the dry grinding state, which will affect the grinding quality. In the process of wet grinding, humidity is very dangerous. The process of wet grinding is very complicated, but the most important thing is to keep it dry in the system.
Grinding and dispersing technology of battery materials
The grinding of battery materials is divided into positive electrode materials and negative electrode materials. The positive electrode refers to a lithium ion battery using lithium iron phosphate as the positive electrode material. The positive electrode materials of lithium ion batteries mainly include lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, and lithium iron phosphate. Among them, lithium cobalt oxide is the cathode material used in most lithium-ion batteries. The negative electrode material mainly uses the grinding of metal silicon. At present, the minimum particle size after metal grinding is D90≤100nm
Recently, reports about the progress of new lithium iron phosphate batteries that are expected to replace traditional lithium batteries have continued, bringing a new energy technology closer to reality: lithium batteries containing iron.
The technical white paper of lithium iron phosphate battery shows that the energy density of a single cell of 32650 specifications (diameter 32mm / length 65mm) can be increased to 6000mAh after using the composite nanomaterials ground by a nano-sand mill. Compared with the 5000mAh specification, the same volume has been improved by a full 1000mAh, which is as much as 20%, and the iPhone 4S mobile phone can be recharged almost 4 times in 1 section.
What is more gratifying is that when used in a single low-rate charge-discharge environment, this battery remains at about 80% after being used up to 3000 times, and ordinary lithium batteries are recharged about 500 times. Too. According to the calculation of charging and discharging every 3 days, it can be used continuously for 24 years and is a veritable long-life battery.
This new battery technology can be widely used in various devices such as portable mobile power, small UPS, laptop batteries, new energy vehicles, etc., and for different use environments, different cell colors are used according to the difference in cycle charging times: oriented The military grade is gold with 3000 cycles; the blue is used in the field of civilian cars, 2,500 times;
Nano sand mill for lithium iron phosphate adopts the following new technologies:
1. The grinding cavity adopts all-ceramic grinding cavity without metal ion pollution;
2. Nano sand mill ceramic materials:95% pure zirconia ceramics (yttrium stabilized zirconia beads),pressureless silicon carbide ceramics, silicon nitride ceramics;
The application of the latest nano materials in lithium batteries:
Silicon-based materials are one of the current research hotspots of anode materials due to their advantages such as high capacity, relatively low charge and discharge platform, and abundant reserves. In this research direction, different structures such as core-shell, hollow silicon nanospheres, hollow silicon nanotubes, and silicon nanowire arrays were designed and prepared to further optimize their electrochemical performance.
At normal temperature, germanium has a higher electronic conductivity and lithium ion diffusion rate than silicon, so germanium is a strong candidate for the anode material of high-power lithium-ion batteries. At present, researchers are trying to prepare various germanium nanostructure materials to improve their electrode performance.
The theoretical capacity of metal tin as a negative electrode material for lithium ion batteries is as high as 994 mAh / g, but its capacity tends to decay rapidly and its cycle performance is poor. In recent years, researchers have developed a series of nanoparticles, nanotubes, nanosheets, nanofibers, porous structures and other forms of tin oxide synthesis and preparation methods, which significantly improved its cycle performance and rate performance.
Titanium dioxide is an ideal anode material for lithium ion batteries that is expected to replace graphite electrodes. In recent years, researchers have conducted a lot of research work on TiO2 anode materials with different morphologies and nanostructures. Iron oxide has attracted great attention from researchers due to its advantages such as high theoretical capacity, abundant resources, and low price.
The most representative cathode material, LiFePO4, is currently a hotspot in the research of cathode materials for lithium ion batteries. Our researchers are committed to using carbon coating, conductive metal ion coating, metal ion doping, and electrode material nanotechnology to improve The performance of LiFePO4. The modified LiFePO4′s discharge capacity, high rate discharge performance, and cycle performance have been improved to varying degrees.
This direction focuses on the systematic study of new lithium-ion battery separator materials including silica, aluminum oxide coated polyimide, polyethylene, polypropylene, polyvinylidene fluoride, etc. The impact of rate discharge performance.
Flexible lithium ion battery
Research in this direction mainly focuses on the use of graphene foam as a current collector to load iron oxide and lithium titanate and other materials to improve the performance of flexible lithium ion batteries and the development of flexible electrode materials based on carbon nanotubes.
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Post time: Apr-09-2020