Recently, the team of Chen Jun, academician of the Chinese Academy of Sciences and professor at the School of Chemistry of Nankai University, designed and synthesized a very high capacity organic cathode material for batteries lithium: cyclohexanexone, which contains the Carbon, hydrogen and oxygen are abundant on Earth, and this type of organic cathode material has the highest capacity value currently reported for lithium-ion batteries, establishing a new world record for the capacity of organic cathode materials for lithium-ion batteries. The relevant results were published in “German Applied Chemistry”. The first author is Lu Yong, a doctoral student at Nankai University, and the corresponding author is Chen Jun. Nankai University is the author's only institution.
Large-capacity, renewable, environmentally friendly and inexpensive lithium battery cathode materials arebecome a hot spot in current research. Organic electrode materials containing carbon, hydrogen, oxygen and other elements are regarded as the new generation lithium-ion battery cathode materials with very sustainable development prospects due to their capacity structural design, their environmental friendliness, their low cost and their abundance.
However, this type of material still faces problems such as low actual capacity and easy dissolution in organic electrolyte, resulting in low energy density and a significant loss of capacity. Therefore, it is of great importance to overcome these two major problems, design and synthesize ultra-high capacity organic cathode materials and solve their dissolution problems in the electrolyte.
“Thanks to molecular design, wecan see that among many organic carbonyl cathode materials, the cyclic ketone material composed of only carbonyl groups has no non-electrochemically active structural units. , it therefore embodies the highest theoretical specific capacity at present. " Chen Jun said that during the experiment, the team first synthesized cyclohexanexone by dehydration reaction and studied the reaction mechanism of cyclohexanexanone by infrared and Raman characterization methods. The results showed that during the charging and discharging process, the mutual conversion of carbonyl and enol groups occurs
The team further optimized the new electrolyte and studied the electrochemical properties. of cyclohexanone in lithium-ion batteries The results showed that the specific discharge capacity of cyclohexanone can reach 902 mA h -1, which is the highest capacity value.e currently known organic electrode materials.
Additionally, due to the low solubility of cyclohexanehexanone in highly polar ionic liquids, it exhibits better cycling performance in ionic liquid-based electrolytes, the assembled battery has features such as. high capacity and long service life. Professor Archer, an academician of the American Academy of Engineering and Cornell University, believes that this pioneering achievement pushed work in this field to its peak.
This work provides a new idea for the design, preparation and battery application of high-capacity organic electrode materials. Lithium-ion batteries using cyclohexanexone as the positive electrode can achieve higher battery capacity and longer cycle life, providing support for future applications in vehicleselectricity, energy storage networks and other fields.