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. Inflatable Baby Float,Child Float Seat,Inflatable Baby Boat,Inflatable Baby Seat P&D Plastic Manufacture Co., Ltd , https://www.jmairfuniture.com