Cr2O5 cathode material with high energy density -Lithium - Ion Battery Equipment

High energy density Cr2O5 cathode material developed by HKUST -Lithium - Ion Battery Equipment

How to improve the energy density of lithium-ion batteries has always been the core content of lithium-ion battery research, especially in the aspect of cathode materials. In order to improve the specific energy, people are "unscrupulous". Therefore, a variety of cathode materials for lithium-ion batteries are emerging one after another, such as lithium rich manganese, ternary materials, etc. The specific capacity of some cathode materials has reached more than 200mAh/g, However, these cathode materials often have the problems of poor cycle life and high irreversible capacity, so people have never stopped developing new high energy density cathode materials. Transition metal oxides, such as NiO, CoO, CuO and other materials, have ultra-high specific capacity (higher than 500mAh/g), which attracts extensive attention. However, the working voltage of these materials to lithium is often lower than 1.0V, so they can only be used as cathode materials, limiting their application in lithium ion batteries. However, the latest research found that some high valence transition metal oxides, such as VO2, V2O5 and MoO3, can achieve a lithium voltage of more than 2.0V, so they have great potential for application in the field of lithium ion batteries. Based on the above research, Xu YongFeng et al. of the University of Science and Technology of China conducted research on the high valence transition metal oxide Cr2O5 material. In the experiment, Cr2O3 was used as raw material, calcined at 350 ℃, 375 ℃ and 400 ℃ in air atmosphere for 2 hours, and then ground to obtain Cr2O5 material.(Lithium - Ion Battery Equipment)

The research shows that the performance of the material is closely related to the baking temperature. With the increase of the baking temperature, the capacity of the material decreases, but the cycling performance has been significantly improved. The material obtained at 400 ℃ has the best cycling performance, the capacity retention rate of 100 cycles can reach 96%, but the capacity is slightly lower, about 220mAh/g, while the material obtained at 350 ℃ has the highest capacity, up to 275mAh/g, and the maximum energy density of the material can reach 819Wh/kg, This is higher than 550Wh/kg of LiCoO2 material. Cyclic voltammetry scanning showed that the discharge voltage plateau of the material was about 3.17V.

The energy conversion efficiency of Cr2O5 material is 83%, which is much higher than CoO (54.6%) and RuO2 (54.9%). It has a good application prospect. The specific capacity of Cr2O5 material exceeds 200mAh/g, the working voltage is higher than 3V, the raw material cost is low, the energy density is high, and the synthesis process is very simple, so it has broad application prospects in the field of energy storage.



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