Lithium cobalt oxide is a common cathode material for lithium batteries and its chemical formula is LiCoO2. Lithium cobalt oxide has high energy density and good electrochemical properties and is widely used in electronic products such as mobile phones and laptops.
The chemical formula of lithium cobalt oxide can be expressed as LiCoO2, where lithium (Li) is a metal element, cobalt (Co) is a metal element transition and oxygen (O) is a metallic element. a non-metallic element. Lithium cobalt oxide is a compound composed of lithium ions and cobaltate ions. Lithium ions are located at the peaks of the crystal lattice of the cathode material, while cobaltate ions are located at the center of the crystal lattice.
Methods for synthesizing lithium cobalt oxide include the solid phase methodat high temperature, sol-gel method, chemical co-precipitation method, etc. Among them, the high temperature solid phase method is one of the most commonly used methods. It mixes and heats raw materials such as lithium compounds, cobalt compounds and oxides at high temperatures to finally obtain lithium cobalt oxide crystals.
The electrochemical properties of lithium cobalt oxide are closely related to the charging and discharging performance of the battery. In the battery, lithium ions are released from the positive electrode material and move to the negative electrode material through the electrolyte and separator, thereby realizing the process of charging and discharging the battery. The crystal structure, particle size, morphology and other factors of lithium cobalt oxide will affect its electrochemical performance.
The oxLithium cobalt yde is an important cathode material for lithium batteries and its chemical formula is LiCoO2. It has high energy density and good electrochemical properties and is widely used in electronic products.
The advantages of lithium cobalt oxide are:
1. High Energy Density: Lithium Cobalt Oxide has a high energy density, meaning that at the same weight. In this case, more electrical energy can be stored, allowing the battery to have a longer service life.
2. Long service life: Lithium cobalt oxide has a long service life, can adapt to different use environments, and has a long service life. This makes it advantageous in situations where prolonged use is required.
3. Good electrochemical properties: Lithium cobalt oxide has good electrochemical properties.es, which means it can provide higher discharge voltage and smooth discharge current, which makes the battery have better performance.
4. Easy to prepare: Compared with other cathode materials, the preparation process of lithium cobalt oxide is relatively simple and easy to carry out in industrial production.
5. Environmental protection: The lithium cobalt oxide cathode material does not contain harmful elements such as cadmium and is environmentally friendly.
6. Increased safety: Compared to early lithium batteries, lithium cobalt oxide is safer because it does not produce dendrites, reducing the risk of internal short circuits in the battery.
7. Suitable for high-rate charging and discharging: Lithium cobalt oxide has good performance, that is, it can be charged and discharged quickly. This makes it advantageous toin applications where high power is required, such as electric vehicles and mobile devices.
8. Good low temperature performance: Lithium cobalt oxide can still maintain good electrochemical performance in low temperature environments, so it is suitable for use in cold environments.
9. Good self-discharge performance: Lithium cobalt oxide cathode material has a low self-discharge rate, that is, the battery will discharge slowly when not in use, but the rate discharge is slow. This allows lithium cobalt oxide batteries to maintain a long lifespan and not require frequent recharging while in use.
10. Good storage performance: Lithium cobalt oxide cathode material has good storage performance and can maintain its performance unchanged for along period. This makes lithium cobalt oxide batteries suitable for situations where they are not used for long periods of time, such as backup power supplies.
Lithium cobalt oxide batteries compared to ternary lithium batteries
Pacific Automotive Network lithium iron phosphate batteries require cobalt , and solid-state batteries need to use cobalt, and the proportion It is even higher than that of lithium-ion batteries, because lithium-ion iron phosphate batteries are suitable for large-scale use in energy storage. energy on the network.
Solid-state batteries must use cobalt, and the ratio is higher than that of lithium-ion batteries. Since iron phosphate lithium ion batteries are suitable for solid-state batteries, cobalt should be used and. the ratio is higher than that of batteries lithium-ion, because lithium-ion iron phosphate batteries are suitable for large-scale use in on-grid energy storage. Cobalt-free batteries are far from being available. Panasonic's cobalt demand could more than triple over the next five years.
Tesla's statement at this time also overturned the outside world's previous suspicions about Tesla. Everyone thought Tesla would use lithium iron phosphate battery technology in the China-made Model 3. According to relevant media reports, Tesla and Chinese power battery supplier CATL will produce electric vehicles without cobalt batteries in the Shanghai factory after entering into a partnership.
This news also makes the outside world believe that Tesla will change the technology design path, and the choice of power batteries will also include ternary cobalt and lithium batteries.thium iron phosphate. In this regard, some netizens asked: "After using cobalt-free batteries, does it mean that they are lithium iron phosphate batteries?"
(Images/Text/Photos: Pacific Automotive Network Q&A)
Which is better, cobalt-containing or cobalt-free lithium batteries?
Their comparisons differ in terms of performance, security and cost.
1. Performance: Lithium cobalt oxide battery has high energy density and is suitable for portable electronic products, such as mobile phones, laptops, etc. Ternary lithium batteries have relatively low energy density but good safety and are suitable for new energy vehicles and large electrical equipment.
2. Safety: Ternary lithium batteries have good thermal stability during charging and deactivationharge and are not prone to thermal runaway, so they are safer. Lithium cobalt oxide batteries decompose easily and produce gas under high temperature conditions, and their safety is relatively low.
3. Cost: The raw material cost of ternary lithium batteries is relatively high, but due to their better safety, they have gradually become the mainstream choice for new energy vehicles. The cost of lithium cobalt oxide batteries is relatively low, but its application in the field of new energy vehicles is subject to certain limitations.
Lithium batteries containing cobalt are better than those containing cobalt.
As an important raw material for lithium-ion batteries, cobalt can significantly increase the energy density of lithium-ion batteries. In order to replace cobalt,Battery manufacturers often increase the use of nickel to increase the energy density of batteries. However, the increased use of nickel will lead to a reduction in the structural stability of corresponding electrode materials, which will affect battery life and safety.
Lithium batteries that still contain cobalt are therefore better at present, and it seems that the cobalt-free solution is still difficult to achieve. So there isn't much choice.
Basic properties of cobalt:
The chemical valencies of cobalt are +2 and +3. It does not interact with water at room temperature and is stable in humid air. It is oxidized to form CoO when heated above 300°C in air and burns to Co3O4 when white hot. Fine metal cobalt powder made by hydrogen reduction method can ignite spontaneously in airto form cobalt oxide. The electrode potential shows that cobalt is a moderately active metal.
Its chemical properties are similar to those of iron and nickel. Oxidation occurs at high temperatures. When heated, cobalt reacts violently with oxygen, sulfur, chlorine, bromine, etc. to form the corresponding compounds. Cobalt is soluble in dilute acid and is passivated in fuming nitric acid forming an oxide film. Cobalt is slowly attacked by hydrofluoric acid, ammonia and sodium hydroxide. Cobalt is an amphoteric metal.