Recently, Hefei University of Technology, researchers at the school successfully prepared a new type of carbon negative electrode material, the material is expected to achieve high-capacity sodium-ion battery and fast charge both.
Relevant results published in the field of energy materials internationally renowned academic journal "advanced energy materials".
With the rapid development of power batteries for new energy vehicles, the problem of limited lithium resources and higher prices has become increasingly prominent. Due to the similar nature of sodium and lithium, high reserves in nature and low price, sodium ion battery is regarded by science and industry as the next generation energy storage system that can replace lithium ion battery.
According to reports, the anode material on the lithium-ion battery fast charge and rate performance is crucial, because the ionic radius of sodium ions is much larger than the lithium ion, currently used in lithium-ion battery graphite negative electrode material is not suitable for sodium Ion batteries, the development of high-performance non-graphite carbon anode materials for the development of sodium ion batteries is of great significance.
Hefei University of Technology School of Materials Science and Engineering Professor Xiang Hongfa and his research team, the use of sodium chloride template method with optimized carbon source prepared by the preparation of three-dimensional amorphous carbon material to achieve its micro-pore and micro-structure effective Regulation.
The results of the use of sodium chloride template, without significant increase in specific surface area under the premise of the appropriate introduction of mesopores with a pore size of 2 ~ 50 nm and macropores with a pore diameter of> 50 nm at the same time, the use of carbon source composition optimization and sodium chloride template Of the limited role, to achieve the orderly / orderly micro-ratio control, thereby improving the performance of carbon anode material rate while having a higher Coulomb efficiency and cycle performance.
Experimental data show that the new carbon negative electrode material can be charged and discharged at a current density of 9.6 amperes per gram, and the sodium storage capacity obtained is doubled compared with other materials at similar current densities. After charging and discharging for 600 times, the battery Performance without attenuation. At the same time, the material synthesis method is simple, and the preparation process has no pollution, and has broad application prospects.