How to improve the specific capacity of lithium battery by manganese - rich stratification technology

In the case that the negative charge of the battery is greater than the positive charge, the improvement of the battery capacity mainly depends on the positive material, which is one of the major advantages of the manganese rich layered technology. Through this technology, the real large-capacity lithium battery can be produced theoretically.

A chemist at the university of California, Berkeley, tripled the capacity of a lithium-ion battery of the same weight using a layered, manganese-rich composite anode technology.

The batteries use the traditional lithium-manganese spinel cathode technology, which refers to a three-dimensional arrangement of atoms. Current lithium-ion batteries are known to have an imbalance between the two electrodes: the negative electrode configuration can accept more charge to improve the specific capacity of the entire battery.

Manganese rich stratification technology includes two meanings:

1, rich in manganese: refers to high capacity rich in manganese positive electrode, the test proved that the lithium battery positive electrode material has both active components and inert components, through the positive electrode material active components, lithium ions can move between the positive and negative poles to form charge and discharge; The inert component helps stabilize the active material, thus extending battery life. A manganese-rich anode material provides an extra third of the energy density.

2. Layering: the preparation of this kind of battery adopts two different layering components, so that the positive electrode presents a layer upon layer composite structure. Therefore, the process selection of coating, porosity and material composition needs to be improved. By layering technology, the ratio of anode materials of lithium battery is more reasonable, and the amount of charge accepted by anode materials is greatly increased.

Currently, the company that developed this technology in cooperation with the above California chemists is envea systems. The specific capacity of the battery developed by the company is 300Wh/kg, and the company hopes to increase this index to 400Wh/kg through the improvement of anode materials. In the case that the negative charge of the battery is greater than the positive charge, the improvement of the battery capacity mainly depends on the positive material, which is one of the major advantages of the manganese rich layered technology. Through this technology, the real large-capacity lithium battery can be produced theoretically.

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