A chemist at the University of California at Berkeley used manganese-rich layered composite cathode technology to double the capacity of a lithium-ion battery of the same weight.

　　In the case that the negative electrode charge of the battery is greater than that of the positive electrode, the increase in battery capacity mainly depends on the positive electrode material. This is a major advantage of the manganese-rich layered technology. This technology can theoretically produce a real large-capacity lithium battery.

　　A chemist at the University of California at Berkeley used manganese-rich layered composite cathode technology to double the capacity of a lithium-ion battery of the same weight.

　　This kind of battery uses the traditional lithium manganese spinel cathode technology. The so-called spinel structure refers to a material with three-dimensional arrangement of atoms. As we all know, in current lithium-ion batteries, there is an imbalance between the two electrodes: the negative configuration can accept more charge to increase the specific capacity of the entire battery.

　　Manganese-rich layering technology has two meanings:

　　1. Manganese-rich: refers to the high-capacity manganese-rich positive electrode. Experiments have shown that the positive electrode material of lithium battery has both active and inert components. Through the active component of the positive electrode material, lithium ions can move between the positive and negative electrodes to form charge and discharge; while inert The ingredients help stabilize the active material, thereby extending battery life. Manganese-rich cathode materials can bring 1/3 more energy density.

　　2. Layering: It means that the preparation of this battery uses two different layered components to make the positive electrode appear as a layer-by-layer composite structure. For this reason, the process selection of coating, porosity and material composition needs to be carried out. Improve. Through the layering technology, the lithium battery cathode material ratio is more reasonable, and finally the acceptable charge amount of the cathode material is greatly improved.

　　The company currently cooperating with the above-mentioned 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 the improvement of cathode materials. In the case where the charge of the negative electrode of the battery is greater than that of the positive electrode, the improvement of the battery capacity mainly depends on the positive electrode material. This is a major advantage of the manganese-rich layered technology. This technology can theoretically produce a real large-capacity lithium battery.