Lithium manganese oxide batteries are a type of lithium-ion battery. For the classification of lithium-ion batteries, because their negative electrode is basically carbon raw material, the main classification method in the industry is based on the positive electrode material of lithium-ion batteries. The so-called lithium manganese oxide battery refers to a battery with a positive electrode made of lithium manganese oxide material. So, what is lithium manganese oxide? It is produced from EMD (a raw material used as a special material for mercury free alkaline manganese batteries) and lithium carbonate (also used as a raw material), combined with corresponding additives, through mixing, sintering and other steps.

Now, when we talk about lithium manganese oxide, we say it has a spinel structure, which refers to the crystal shape it uses in lithium batteries. When lithium manganese oxide is not used in lithium batteries, there is also a layered structure. Relatively speaking, the spinel structure is more stable than the layered structure (although stability of different shapes in geometry can also be thought of based on chemical properties), so spinel structure is still used in practical applications.

In addition to lithium manganese oxide, lithium cobalt oxide and ternary lithium battery positive electrodes are also spinel structures. However, lithium manganese oxide, which has a spinel structure, has a very distinct personality compared to its two counterparts, that is, its advantages and disadvantages are very prominent. Its advantages are: low temperature resistance, good rate performance, and relatively easy preparation. The disadvantages are: the material itself is unstable, needs to be mixed with other materials, poor high temperature performance, poor cycling performance, and fast decay. These drawbacks of lithium manganese oxide are derived from the characteristics of manganese. However, due to the widespread presence of manganese, it has a significant cost advantage.

Because lithium manganese oxide materials have such distinct characteristics, people can easily utilize their advantages and suppress their disadvantages, making lithium manganese oxide batteries applicable in different fields, usually referred to as Class A and Class B applications. Class A refers to batteries used for power batteries, with a focus on safety and cycling performance. The requirement is for a reversible capacity of 100-115mAh/g, which can maintain 80% capacity after 500 cycles. Class B is mainly used in consumer electronics (mobile phones), characterized by high capacity. The general requirement is a reversible capacity of 120 mAh/g, but the cycling performance only requires maintaining 60% capacity after 300-500 cycles.

The different performance of these two types of batteries is achieved during the production process. As mentioned earlier, the preparation of lithium manganese oxide is relatively simple. If it is to be processed into positive electrodes suitable for Class A and Class B batteries respectively, the additives and operating procedures will be different, and different synthesis methods will be used. Specifically, there are: high-temperature solid-phase method, melt impregnation method, microwave synthesis method, co precipitation method, hydrothermal synthesis method, etc. If each preparation method is described in detail, it is a manufacturing process problem. Here, it is only necessary to know that there are multiple methods.