Lithium ion battery has been widely used in portable electronic devices, storage devices and other fields. But with the lithium ion battery has been gradually applied to the intelligent mobile phone, electric cars and other fields, the demand for lithium's rapid growth year after year, while the global lithium reserves are very limited and uneven distribution, caused by the rapid rise in the price of raw materials, restrict the low cost, high performance storage devices. The rapid development of potassium and lithium with similar physical and chemical properties, and its abundant reserves, low cost, and compared with sodium oxide has lower reduction potential, which was two times the potassium ion battery system based on attention. In addition, in recent years double, carbon batteries due to its negative environmental use cheap graphite materials, has the advantages of low cost, high working voltage, by the industry's attention.

Combined with the advantages of lithium ion batteries and their double carbon batteries, Tang Yongbing and team member Ji Bifa, Zhang Fan, et al. Successfully developed a new type of high performance, low cost, double carbon and potassium ion battery. The battery using environmentally friendly mesocarbon microbeads as anode, graphite as cathode electrolyte; using cheap six fluorine potassium phosphate as electrolyte salt dissolved in an organic solvent. The reaction mechanism is: when charging, the electrolyte of potassium ion movement to the MCMB anode surface, and embedded into the graphite layer, and six fluorine phosphate anion intercalated into graphite anode; discharge, potassium ion released from anode the graphite layer, and six fluorine phosphate cathode in graphite intercalation to the electrolyte.

Research shows that the discharge voltage of the median new low-cost double carbon potassium ion battery is up to 4.5V, the single button battery can also lit two LED lights, and the battery charge and discharge capacity after 100 cycles, almost no attenuation, so it can meet the requirements of high voltage devices. Relative to the traditional lithium ion battery technology, the a new type of battery will greatly reduce the production cost, but also has high safety, environmental friendly, energy density is relatively high, so in the large-scale renewable clean energy storage, and has wide application prospect of communication standby power supply and other fields.

Issued by Miss Geng, HRD, Jul. 31, 2017.

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