China has developed a carbon negative electrode material with excellent sodium retention

Institute of Physics, Chinese Academy of Sciences, Dr. Li Yunming, Hu Yongsheng researchers using hydrothermal method to obtain a hard carbon microspheres, and then use cotton as a precursor through a one-step carbonization obtained a hard carbon microtubules, although hard carbon has excellent Of sodium storage performance, but its high cost limits the industrial application. Next, they proposed to add a second phase, such as a hard carbon precursor, to the soft carbon precursor pitch to obtain an amorphous carbon material with a high degree of disorder by the interaction therebetween, and this composite precursor has Higher carbon yield (about 60%), as the negative electrode material for sodium ion batteries, exhibits specific capacity up to 250 mAh / g, excellent cycle stability and rate performance.

Recently, they made breakthroughs in carbon-based anode materials for sodium ion batteries. Using cheaper and cheaper anthracite as a precursor, they obtained a carbon negative electrode material with excellent sodium retention by simple pulverization and one-step carbonization. Pyrolysis of anthracite results in a soft carbon material, but unlike soft carbon from bitumen, it has a high degree of disorder below 1600 ° C with up to 90% carbon yield and a sodium storage capacity of 220 mAh / g, excellent cycle stability. The most important thing is the highest price / performance ratio of all carbon-based negative electrode materials. Its application prospects are also validated in a flexible battery. The energy density of a flexible battery fabricated using it as a negative electrode and a Cu-based layered oxide as a positive electrode is 100 Wh / kg, and the capacity retention rate at 1 C charge-discharge rate is 80 %, - 20% discharge capacity of 86% at room temperature, cycle stability, and passed a series of safety tests for lithium-ion batteries. The successful development of low-cost sodium-ion battery is expected to be the first to be applied to low-speed electric vehicles and lead-free of low-speed electric vehicles. As the technology is further matured, it will be popularized in areas such as communication base stations, household energy storage and grid storage.


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