New electrochemical corrosion preparation technology for making battery electrode "in one step"
On December 5, it was learned from Tianjin University that the Jikemeng research team of Tianjin University, together with Professor Tan Yongwen's team of Hunan University, developed an electrochemical corrosion preparation technology that can be used to make battery electrodes in only one step by using cobalt phosphorus alloy. The relevant research results were recently published in the international journal Advanced Materials.
In recent years, with the rapid development of portable electronic equipment and new energy and clean energy vehicles, the market demand for batteries is growing. The traditional battery electrode preparation process involves nearly ten steps, such as gluing, batching, homogenizing, coating, rolling, baking, and so on; Many non active materials such as binder, conductive agent and collector are also needed, which greatly increases the preparation cost of the battery and greatly reduces its actual energy density.
It is reported that the new technology only needs to put the cobalt phosphorus alloy into the energized salt solution for selective corrosion and potential control oxidation, and then the battery electrode can be prepared in one step. The whole preparation process is less than 1 hour, safe and green, and easy to achieve large-scale production. Thanks to its integrated structural design, the electrode material can be used for battery assembly without burdening, homogenizing, coating and other cumbersome steps like other electrode materials, greatly simplifying the battery preparation process.
The density of active material of cobalt based compound electrode made by this technology is 2-3 times that of traditional graphite electrode. The higher the density of active substance, the higher the storage capacity per unit volume of electrode. The research results show that the storage capacity of the newly developed cobalt based compound electrode is 5 times that of the graphite electrode with the same volume, and its integrated structure design also makes its charging rate nearly 10 times faster than that of the traditional graphite electrode, and its cycle life exceeds 6000 times, which is 2-4 times the cycle life of the lithium battery on the market.
"Only two kinds of raw materials are needed to prepare electrodes using this technology. One is the salt that people eat in their daily life, and the other is the metal alloy with very mature industrial production technology. In addition, no other additives and traditional collector fluid that must be used are needed. Because salt and alloy are very common and cheap, this integrated electrode has a very significant cost advantage, and excellent energy storage performance also enables It has a very broad application prospect. " Introduced by Ji Kemeng.
The successful research and development of this electrode preparation technology has opened up a new idea for the development of new integrated energy storage electrode, expanded the application field of industrial alloy with high added value, and helped the industrialization process of electrochemical corrosion technology.
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