14250 battery

New high-performance, low-cost 14250 battery technology has been successfully developed

Recently, Tang Yongbing, a researcher at the Functional Thin Film Materials Research Center of the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, and his research team have successfully developed a new high-performance, low-cost 14250 battery technology, which is expected to break the existing 14250 battery industry pattern. The relevant research results "A Noveland Generalized Lithium-Ion Battery Configuration Utilizing Al Foils as Both Anodes and Current Collectors for Enhanced Energy Density (A new universal high-energy density 14250 battery based on aluminum foil anode/current collector)" have been published online in the excellent materials journal Advanced Materials, (DOI: 10.1002/adma.201604219, IF=18.96), and an international invention patent (PCT/CN2016/081346) has been applied for.

With the development of science and technology, lithium batteries have been widely used in portable electronic devices, mobile tool power supplies and other fields, and their market size has expanded rapidly. In particular, the demand for electric vehicles and large-scale energy storage facilities has increased, and the development of new secondary batteries with high energy density, low cost and long cycle life has become more urgent. Since Sony commercialized lithium batteries in 1991, they have a 25-year development history. Their working principle is to rely on the movement of lithium ions between the positive electrode (lithium cobalt oxide, lithium iron phosphate, ternary, etc.) and the graphite negative electrode (embedding and de-embedding) to realize the battery's charging and discharging process. However, commercial lithium batteries still have problems such as low energy density, high manufacturing cost and large capital investment, which restrict the development of the battery industry.

Based on the above considerations, researcher Tang Yongbing and his team members Ji Bifa, Zhang Fan, Sheng Maohua and others successfully developed a new 14250 battery based on aluminum foil negative electrode. The new battery directly uses aluminum foil as both the battery negative electrode and current collector, replacing the graphite negative electrode and copper foil current collector of traditional lithium batteries; the positive electrode uses currently common commercial lithium cobalt oxide, lithium iron phosphate, ternary materials, etc.; the electrolyte uses carbonate solvents. The new battery has a new full-battery reaction mechanism: when charging, lithium ions are deintercalated from the positive electrode material, move to the surface of the aluminum foil negative electrode, and form an aluminum-lithium alloy with aluminum; when discharging, lithium ions are removed from the aluminum-lithium alloy and embedded in the positive electrode material.

This structure can not only effectively reduce the weight and volume of the battery, significantly improve the mass and volume energy density, but also greatly reduce the production and manufacturing costs, and has wide universality. The research results show that the energy density of the full battery (LCO-Al) with lithium cobalt oxide as the positive electrode and aluminum foil as the negative electrode can reach 263Wh/kg, and the battery capacity remains at 81% after 250 charge and discharge cycles; the energy density of the full battery (LFP-Al) with lithium iron phosphate as the positive electrode and aluminum foil as the negative electrode reaches 163Wh/kg, and the battery capacity remains at 84% after 500 charge and discharge cycles; the energy density of the full battery (NCM-Al) with nickel cobalt manganese oxide ternary material as the positive electrode and aluminum foil as the negative electrode reaches 258Wh/kg, and the battery capacity remains at 86% after 250 charge and discharge cycles. This research result has great industrialization prospects and is expected to change the existing 14250 battery industry landscape.

This research was funded by the Guangdong Provincial Innovation Research Team, Guangdong Provincial Science and Technology Plan Project, Shenzhen Science and Technology Plan Project and the National Natural Science Foundation.

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