Successful synthesis of organic cathode materials for ultra-high-capacity lithium-ion batteries

by:CTECHi     2021-07-22

The reporter learned from Nankai University on the 15th that the team of Chen Jun, an academician of the Chinese Academy of Sciences and professor of the School of Chemistry of Nankai University, has recently designed and synthesized a lithium-ion battery organic cathode material with ultra-high capacity-cyclohexanone, which contains The earth is rich in carbon, hydrogen, and oxygen elements, and this type of organic cathode material exhibits the highest capacity value currently reported for lithium ion batteries, breaking the world record for the capacity of organic cathode materials for lithium ion batteries.

Related results were published in 'Germany Applied Chemistry'. Nankai University is the only unit, the first author is PhD student Lu Yong, and the corresponding author is Chen Jun.

High-capacity, renewable, environmentally friendly, and low-cost lithium battery cathode materials have become a current research focus. Organic electrode materials containing carbon, hydrogen, oxygen and other elements are considered to be very promising cathode materials for the next generation of lithium-ion batteries because of their structural design and environmental friendliness.

However, this type of material still faces problems such as low actual capacity and easy solubility in organic electrolytes, which results in low energy density and serious capacity attenuation. Therefore, how to overcome these two problems, design and synthesize an organic cathode material with ultra-high capacity, and solve the problem of its dissolution in the electrolyte is of great significance.

According to the introduction, the team further optimized the new electrolyte and studied the electrochemical performance of cyclohexanone in lithium-ion batteries. The results showed that the discharge ratio of cyclohexanone The capacity can reach 902mAhg-1, which is the highest known organic electrode material capacity. In addition, due to the low solubility of cyclohexanone in highly polar ionic liquids, it has better cycle performance in ionic liquid-based electrolytes, and the assembled battery exhibits the characteristics of high capacity and long cycle life. Academician of the American Academy of Engineering and Professor Archer of Cornell University believes that this pioneering result has pushed the work in this field to the top.

This work provides a new idea for the design, preparation and battery application of high-capacity organic electrode materials. Lithium-ion batteries with cyclohexanone as the positive electrode can achieve the advantages of higher battery capacity and longer life, providing support for future applications in electric vehicles, energy storage grids and other fields.

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