Researchers have successfully prepared a new type of carbon anode material, which is expected to achieve both the high capacity and fast charging of sodium ion batteries.
With the rapid development of power lithium-ion batteries for new energy vehicles, the problems of limited lithium resources and high prices have become increasingly prominent. Due to the similar nature of sodium and lithium, high reserves in nature and low price, sodium ion batteries are considered by the scientific and industrial circles as a next-generation energy storage system that can replace lithium-ion batteries.
The influence of anode materials on the fast charge and rate performance of lithium/sodium ion batteries is very important. Since the ion radius of sodium ions is much larger than that of lithium ions, graphite anode materials currently suitable for lithium ion batteries are no longer suitable for sodium ion batteries. The development of high-performance non-graphite carbon anode materials is of great significance for the development of sodium ion batteries.
The three-dimensional amorphous carbon material prepared by the sodium chloride template method combined with the optimized carbon source composition realizes the effective control of its micro-pore and micro-domain structure.
This result uses sodium chloride template, and appropriately introduces mesopores with a pore diameter of 2-50nm and macropores with a pore diameter of >50nm without significantly increasing the specific surface area. At the same time, the composition optimization of the carbon source and the limitation of the sodium chloride template are used. Domain use, to achieve the regulation of the ratio of disordered/ordered micro-domains, thereby improving the rate performance of the carbon anode material while having higher coulombic efficiency and cycle performance.
Experimental data shows that this new carbon anode material can be charged and discharged at a current density of 9.6 amperes per gram, and the obtained sodium storage capacity is doubled compared with other materials at similar current densities, and the battery can be charged and discharged 600 times No performance degradation. At the same time, the synthesis method of the material is simple, and the preparation process is pollution-free, and has broad application prospects.
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