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The team led by Tang Yongbing from the Shenzhen Advanced Technology Research Institute of the Chinese Academy of Sciences has developed a new type of battery technology, which was recently published in Advanced Energy Materials. If this technology is industrialized, it will have a significant impact on the existing lithium battery industry landscape.

At present, the main energy conversion and storage devices in many fields are lithium-ion batteries, but lithium-ion batteries have low energy density, high manufacturing costs, and battery disposal can cause serious environmental problems. Both lithium-ion battery pack driven electric vehicles and fuel cell driven electric vehicles face challenges in cost and range.

Tang Yongbing's team has discovered a new type of high-energy density aluminum graphite dual ion battery, which is a new high-efficiency and low-cost energy storage battery. They have adjusted the positive and negative electrodes of traditional lithium-ion batteries, replacing lithium cobalt oxide, lithium manganese oxide, ternary or lithium iron phosphate that have been widely used in lithium-ion batteries with inexpensive and readily available graphite as the positive electrode material; Using aluminum foil as both the negative electrode material and negative current collector of the battery; The electrolyte is composed of conventional lithium salts and carbonate organic solvents.

The working principle of this battery is different from traditional lithium-ion batteries. During the charging process, the positive electrode graphite undergoes anion intercalation reaction, while the aluminum negative electrode undergoes aluminum lithium alloying reaction, and the discharge process is the opposite. This new reaction mechanism not only significantly improves the working voltage of the battery (3.8~4.6V), but also significantly reduces the quality, volume, and manufacturing cost of the battery, thereby comprehensively improving the energy density of the entire battery (~220Wh/kg).

"This discovery is surprising, it is a new battery technology that has never been reported before," commented the reviewer. If this technology is industrialized, future smartphones may be even thinner and lighter than they are now, and they no longer need to be charged every day. At the same time, it also solves the key problems of high cost and short range of electric vehicle batteries. However, the current battery technology still needs to be optimized, such as improving battery cycling stability.

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