Прогресс в материалах для литиевых батарей в Хунаньском университете - Оборудование для литий-ионных батарей
22 Окт 2022
Lithium rich manganese cathode material xLi2MnO3˙ (1-x) LiMO2 (M=Ni, Co, M) has the characteristics of high specific capacity (>250mAh/g), high working voltage, low cost, environmental friendliness, etc. It has attracted the attention of researchers in recent years and is considered as a strong competitor of the next generation of lithium ion battery cathode materials.
The rapid development of mobile electronic equipment and electric vehicle industry has promoted the vigorous development of lithium-ion battery technology. However, the problems of low specific capacity of lithium-ion battery cathode materials and low specific energy of battery have become important obstacles to the further development of electric vehicles. Lithium rich manganese cathode material xLi2MnO3˙ (1-x) LiMO2 (M=Ni, Co, M) has the characteristics of high specific capacity (>250mAh/g), high working voltage, low cost, environmental friendliness, etc. It has attracted the attention of researchers in recent years and is considered as a strong competitor of the next generation of lithium ion battery cathode materials. However, lithium rich manganese cathode materials also have some shortcomings, such as poor magnification performance and poor cycling performance, which is also the reason why lithium rich cathode materials cannot be commercialized.(Lithium - Ion Battery Equipment)
Recently, Wen Xiaofeng, a postgraduate of Professor Liang Kui's team, found that after the lithium rich manganese cathode material was treated with aluminum nitrate solution and calcined, its surface layer structure could be transformed into a spinel structure, and a layer of aluminum oxide was coated on the spinel structure. The spinel structure has a 3D lithium ion transport channel, which greatly improves the lithium ion conduction rate, thereby improving the magnification performance of the material; At the same time, the aluminum oxide coating can isolate the direct contact between the active material and the electrolyte, prevent the damage of the electrolyte to the active material, and improve the circulation performance. This treatment method has simple process and low requirements for equipment, which can simultaneously improve the magnification performance and cycling performance of lithium rich manganese cathode materials. After modification, the discharge capacity of lithium rich manganese cathode material can reach 240 mAh/g at 250 mA/g current density and 190 mAh/g at 1250 mA/g high current density.
The rapid development of mobile electronic equipment and electric vehicle industry has promoted the vigorous development of lithium-ion battery technology. However, the problems of low specific capacity of lithium-ion battery cathode materials and low specific energy of battery have become important obstacles to the further development of electric vehicles. Lithium rich manganese cathode material xLi2MnO3˙ (1-x) LiMO2 (M=Ni, Co, M) has the characteristics of high specific capacity (>250mAh/g), high working voltage, low cost, environmental friendliness, etc. It has attracted the attention of researchers in recent years and is considered as a strong competitor of the next generation of lithium ion battery cathode materials. However, lithium rich manganese cathode materials also have some shortcomings, such as poor magnification performance and poor cycling performance, which is also the reason why lithium rich cathode materials cannot be commercialized.(Lithium - Ion Battery Equipment)
Recently, Wen Xiaofeng, a postgraduate of Professor Liang Kui's team, found that after the lithium rich manganese cathode material was treated with aluminum nitrate solution and calcined, its surface layer structure could be transformed into a spinel structure, and a layer of aluminum oxide was coated on the spinel structure. The spinel structure has a 3D lithium ion transport channel, which greatly improves the lithium ion conduction rate, thereby improving the magnification performance of the material; At the same time, the aluminum oxide coating can isolate the direct contact between the active material and the electrolyte, prevent the damage of the electrolyte to the active material, and improve the circulation performance. This treatment method has simple process and low requirements for equipment, which can simultaneously improve the magnification performance and cycling performance of lithium rich manganese cathode materials. After modification, the discharge capacity of lithium rich manganese cathode material can reach 240 mAh/g at 250 mA/g current density and 190 mAh/g at 1250 mA/g high current density.
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