What are the cathode materials for lithium ion batteries?
Motive battery (lithium ion battery) is the heart of new energy vehicle, generally speaking, power battery cost about 40% of new energy vehicle. The cathode material is the core of power battery, and its cost in power battery is about 40%.
The choice of cathode material directly determines the performance of the battery. Because cathode materials have a great influence on battery performance, many researchers are committed to developing cathode materials with higher performance, such as lithium nickel acid, lithium cobalt, lithium titanate and so on.
1. lithium nickel oxide. Lithium nickel oxide is mainly represented by lithium nickel acid. The product characteristics are similar to that of nickel cobalt oxide, but the price is lower than that of nickel cobalt oxide. Because of its high energy density ,274 mAh/g, is an ideal cathode material for lithium ion battery with high energy density.
2. lithium cobalt oxide. Lithium cobalt oxide is mainly represented by lithium cobalt oxide, which has five high characteristics, namely, high energy density, high price, high power, high commercialization degree, high cycle life, and obvious deficiency. Cobalt salt needs to be imported.
3. lithium titanium oxide. The typical representative of lithium titanium oxide is lithium titanate, this field Zhuhai Yinlong occupies the dominant position, the advantage of lithium titanate is fast charge, the disadvantage is that the energy density is small, running for a period of time need to charge. Another advantage is security, and the third advantage is that the number of cycles can reach 20,000.
4. nickel cobalt multiple oxides. This is what we often call multiple oxides. At present, the most common are lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminate. Among them, lithium nickel cobalt manganese oxide is divided into lithium nickel cobalt manganese oxide 111, lithium nickel cobalt manganese oxide 523, lithium nickel cobalt manganese oxide 622, lithium nickel cobalt manganese oxide 811.
5. lithium manganese oxide. Lithium manganese oxide is mainly represented by lithium manganese oxide and lithium permanganate. The resources are abundant in our country, and the products are also hot research at present. LiMn2O4 have its high energy density, but the stability is greatly reduced. Especially under high temperature, the LiMn2O4 is unstable.
6. lithium iron and phosphorus oxides. The main representative of lithium iron and phosphorus oxide is lithium iron phosphate. The performance of all parties is balanced, non-toxic and pollution-free, and the cycle times are not less than 2000 times. As the power energy of passenger cars, the safety performance belongs to the high grade.
moreover, cathode candidates for li-ion batteries can be classified into three main categories according to their structure :(1) layered LiMO2(m =Co、Ni、Mn) cathode materials ;(2) LiMn2O4 cathode materials with spinel structure; and (3) LiFePO4 cathode materials with olivine structure.
