From：CTECHI GROUP Limited Release time：2019-01-05
Overview：In recent years, due to the wide application of portable electronic products in our daily life, lithium-ion batteries have been the focus of energy storage research and development. With the increasing demand for global energy storage in more and more fields, such as electric vehicles, hybrid electric vehicles, especially large grid energy storage (solar energy, wind energy, tidal energy) used to buffer intermittent energy sources, lithium-ion batteries can not meet the needs of society due to the cost and limited availability of lithium. Therefore, besides lithium-ion batteries, other battery technologies need to be developed.
In recent years, due to the wide application of portable electronic products in our daily life, lithium-ion batteries have been the focus of energy storage research and development. With the increasing demand for global energy storage in more and more fields, such as electric vehicles, hybrid electric vehicles, especially large grid energy storage (solar energy, wind energy, tidal energy) used to buffer intermittent energy sources, lithium-ion batteries can not meet the needs of society due to the cost and limited availability of lithium. Therefore, besides lithium-ion batteries, other battery technologies need to be developed.
Sodium ion batteries are promising batteries. The storage of Na resources on the earth is more than one thousand times higher than that of Li resources, and the cost of developing Na resources is much lower than that of Li resources. Moreover, sodium and Li elements are in the same main group in the periodic table of elements and have similar chemical and physical properties, which makes sodium as the energy storage medium of secondary batteries have similar mechanism with Li. However, because the radius of sodium ion is larger than that of Li ion, it is difficult to insert sodium ion into the existing active electrode materials, which also leads to the serious delay in the development and application of Na ion batteries. Therefore, it is of great significance to research and develop high performance and low cost electrode materials for sodium ion batteries, especially for anode batteries. At present, scientists have developed many kinds of anode materials for sodium ion batteries. Carbon-based materials have attracted great interest of researchers because of their rich, low potential, low cost and other advantages. These advantages are of great significance to the practical application of sodium ion batteries. However, the capacitance of carbon-based anodes is limited, the initial coulomb efficiency is low, and the rate performance is poor in practical application. Therefore, the development of new carbon-based anode materials is a hot research area of sodium ion batteries.
Recently, Zheng Chunming team of Tianjin University, together with Galen D. Stucky team of California University, developed a honeycomb-like nitrogen-rich layered porous carbon as a high-speed anode material with superstable recyclability, which can significantly improve the performance of sodium ion batteries. The research team used glycine as carbon and nitrogen precursor and sodium chloride as template. After spray drying, pyrolytic porous carbon with expansive layer spacing and high disorder was synthesized under the mobile ammonia gas. The disordered phase and extended interlayer distance of layered porous carbon reduce the barrier of Na ion insertion, thus improving the storage rate of Na ion. The abundant nitrogen doping in layered porous carbon results in abundant defects and improves the electrochemical activity. At the same time, layered porous structure and nitrogen doping together bring outstanding energy storage performance and excellent and stable cycle performance to carbon-based anode materials. At 500 mA/g current density, after 3000 cycles of charging and discharging, 255.9 mA*h/g reversible discharge capacity can also be provided. Even at high current density (5000mA/g) and ultra-long cycle (10000 cycle), 101.4mA*h/g reversible capacity can be obtained, and 97.3% discharge capacity can be retained compared with 1000 cycle, which also proves that layered porous carbon has excellent rate performance and cycle stability.
Subsequently, the team used layered porous carbon as the anode and Na3V2 (PO4) 3/C as the cathode to form a full cell and a larger wearable full cell. At a current density of 100 Ma/g, it can also provide 238.7 mA*h/g of potential power within a voltage range of 1-3.9 volts after 100 cycles. Compared with the second cycle, it retains 95.3% of the power. Wearable batteries show excellent power output. These two results show the practical application prospects of layered porous carbon in sodium ion batteries.
Compared with lithium-ion batteries, sodium-ion batteries have lower cost. We hope that such battery technology will appear in our daily life as soon as possible. Looking forward to the early application of the new generation battery system.
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