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    Home > Adv.mater. Shenzhen Advanced Institute has developed a new high efficiency and low cost potassium ion battery technology

    Adv.mater. Shenzhen Advanced Institute has developed a new high efficiency and low cost potassium ion battery technology

    • Last Update: 2017-04-27
    • Source: Internet
    • Author: User
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    Recently, Tang Yongbing, researcher of functional film materials research center of Shenzhen Institute of advanced integration technology, Chinese Academy of Sciences, and his research team have successfully developed a new high-performance and low-cost potassium type dual ion battery technology, which is expected to replace the existing traditional lithium-ion battery technology and realize industrialization Related research results a new potassium ion based dual ion battery has been published online in the International Material Journal advanced materials doi: 10.1002/adma.201700519 Lithium ion batteries have been widely used in portable electronic equipment, energy storage equipment and other fields However, with the gradual application of lithium-ion batteries in smart phones, electric vehicles and other fields, the demand for lithium is growing rapidly year by year, and the global reserves of lithium are very limited and unevenly distributed, resulting in the rapid rise in the price of raw materials, which seriously restricts the rapid development of low-cost and high-performance energy storage parts in China Due to the similar physical and chemical properties of potassium and lithium, and its rich reserves, low cost, and lower redox potential compared with sodium, the secondary battery system based on potassium ion has been widely concerned Combined with the advantages of potassium ion battery and double ion battery, Tang Yongbing and his graduate student Ji Biffa have successfully developed a new type of tin graphite double ion battery with high efficiency and low cost based on potassium ion electrolyte The battery uses tin foil as the anode and collector, expanded graphite as the anode, and potassium hexafluorophosphate as the potassium salt electrolyte, which is cheap and easy to get, is used to dissolve in organic solvent The new battery has high energy density and long cycle life, and greatly reduces the production cost of the battery The reaction mechanism of the new battery is as follows: when charging, the potassium ion in the electrolyte moves to the negative electrode surface of the tin foil to form a potassium tin alloy, and the hexafluorophosphate is inserted into the positive graphite; when discharging, the potassium tin alloy on the negative electrode is de potassium, and the hexafluorophosphate in the positive graphite is de embedded back into the electrolyte The results show that after 300 cycles of charging and discharging at a constant current of 50mA g-1, the capacity of the new potassium based double ion battery remains 93%, and the energy density can reach 155wh / kg, which is equivalent to the energy density of the existing traditional lithium ion battery The research results are expected to replace the existing traditional lithium-ion battery technology, and have a huge industrial application prospect The research was supported by NSFC, Guangdong innovation research team, Guangdong science and technology program, Shenzhen Science and technology program and NSFC (a) The reaction mechanism diagram of the new type of potassium ion battery; (b) the XRD diagram of sn-k alloying reaction; (c) the rate performance curve of the battery; (g) the cycle stability test curve of the new type of battery.
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