Chemists at the University of California, Berkeley, have tripled the capacity of lithium-ion batteries of the same weight through manganese-rich layered composite cathode technology. This battery uses traditional lithium manganese spinel cathode technology. The so-called spinel structure refers to a material in which atoms are arranged in three dimensions. In current lithium-ion batteries there is an imbalance between the two electrodes: the negative electrode configuration can accept more charge to increase the specific capacity of the entire battery. Manganese-rich stratification technology includes two meanings: 1. Manganese-rich: refers to high-capacity manganese-rich cathodes. Tests have proven that lithium battery cathode materials have both active components and inert components. Through the active components of the cathode material, lithium ions can be The movement between the negative electrodes forms charge and discharge; while the inert components help stabilize the active material, thereby extending battery life. Manganese-rich cathode materials can bring 1/3 more energy density. 2. Stratification: This means that the preparation of this kind of battery uses two different layered components, so that the positive electrode appears as a layer-by-layer composite structure. For this reason, process selection such as coating, porosity and material composition needs to be carried out. Improve. Through layering technology, the ratio of cathode materials for lithium batteries is made more reasonable, which ultimately greatly increases the number of charges that the cathode material can accept. The company currently cooperating with California chemists to develop this technology is Envia Systems. The battery developed by the company has a specific capacity of 300Wh/kg, and the company hopes to increase this indicator to 400Wh/kg through improvements in cathode materials. When the negative electrode charge of the battery is greater than the positive electrode, the increase in battery capacity mainly depends on the positive electrode material. This is the reason for the existence of manganese-rich layering technology. Through this technology, truly large-capacity lithium batteries can be produced in theory.

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