What about the material analysis of lithium cobalt, lithium manganese and lithium iron phosphate batteries?

1, LiCoO2

In the current commercial lithium ion battery, the layered structure of LiCoO2 is basically used as the anode material. Its theoretical capacity is 274mAh/g, while the actual capacity is about 140mAh/g. It has also been reported that the actual capacity has reached 155mAh/g. The main advantages of this anode material are: high working voltage (average working voltage is 3.7v), stable charging and discharging voltage, suitable for large current charging and discharging, high specific energy, good cycling performance, high conductivity, simple production process, easy preparation, etc. The main disadvantages are: high price, poor resistance to overcharge, cycle performance to be further improved.

2, LiMn2O4

LiMn2O4 has spinel structure for lithium ion battery cathode material. Its theoretical capacity is 148mAh/g, and its actual capacity is 90 ~ 120mAh/g. Working voltage range is 3 ~ 4V. The main advantages of the anode material are: abundant manganese resources, low price, high safety and easy preparation. The disadvantage is that the theoretical capacity is not high; The material will slowly dissolve in the electrolyte, that is, the compatibility with the electrolyte is not good. In the process of deep charge and discharge, the material is prone to lattice lattice degeneration, resulting in the rapid attenuation of battery capacity, especially at higher temperatures. In order to overcome the above disadvantages, a new layered manganese trivalent oxide LiMnO2 has been developed in recent years. The theoretical capacity of the anode material is 286mAh/g, and the actual capacity is about 200mAh/g. Operating voltage range is 3 ~ 4.5v. Although compared with spinel LiMn2O4, LiMnO2 has been greatly improved in both theoretical capacity and practical capacity, there is still the problem of structural instability during charging and discharging. In the process of charging and discharging, the crystal structure changes repeatedly between the layered structure and the spinel structure, which causes the repeated expansion and contraction of the electrode volume, leading the deterioration of the battery to cycle performance? Moreover, LiMnO2 also has the problem of dissolution at higher operating temperature. The solution to these problems is doping and surface modification of LiMnO2. Welcome progress has been made.

3, LiFePO4

In recent years, research on the hot lithium ion battery anode materials. Its theoretical capacity is 170mAh/g, and its actual capacity is up to 110mAh/g without doping modification. The LiFePO4 is more stable, safer, environmentally friendly and affordable. The main disadvantages of LiFePO4 are low theoretical capacity and low room temperature conductivity. For these reasons, LiFePO4 has promising applications in large lithium-ion batteries. However, LiFePO4 also faces a number of performance shortcomings in order to be competitive in the lithium ion battery market as a whole.

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