Detailed explanation of the advantages and disadvantages of lithium manganate batteries

The advantage of the manganese acid tank is good rate performance, easier preparation and lower cost. The disadvantage is that the high temperature performance and cycle performance are poor due to the dissolution of manganese. Through doping with aluminum and sintering granulation, the high temperature performance and cycle performance have been greatly improved, which can basically meet the actual use. In general, lithium manganate batteries have low cost, strong stability, strong low temperature performance, poor high temperature performance, and slightly faster attenuation. There are three types of silver manganate: (1) Layered lithium manganate LiMnO2, theoretical capacity 285mA-h/g, voltage platform 4V. The layered structure is difficult to synthesize and unstable, and it is easy to generate Li2Mn204 spinel structure, which leads to a drop in voltage plateau, poor stability, and irreversible capacity degradation. (2) High-voltage spinel lithium manganese oxide LiMn204, theoretical capacity 148mA-h/g, voltage plateau 4.15. The high temperature performance is poor, and the capacity attenuation above 55℃ is serious. It is also easy to generate Li2Mn204 spinel structure, resulting in a drop in voltage plateau, poor stability, and irreversible capacity degradation. Industrial manganese carp currently uses this type. (3) Spinel lithium manganese oxide Li2Mn2O4, low voltage (3V), low passenger volume, and poor circulation, are all studying how to guard against such things. Ternary: In order to solve the defects of layered lithium manganate, through the method of doping metal elements, invented the ternary material LiNiCoMnO2 (LiNiCoAlO2), which is replaced by Ni and Co (Al), which takes into account the high capacity and high capacity of nickel acid buried. Voltage, high voltage and high safety of lithium manganate, good circulation of lithium borate, and at the same time overcome the shortcomings of difficulty and instability in synthesis of lithium manganate and lithium nickelate, and high cost of lithium borate, becoming the current mainstream cathode material. The theoretical capacity is 280mA-h/g, the voltage is 2.7~4.2, and the current actual capacity is about 160mA-h/g. A battery made of lithium manganate material is used as the positive electrode. So, what is lithium manganate? It is made of EMD (a raw material used as a special material for mercury-free alkaline manganese batteries) and lithium carbonate (also used as a raw material), with corresponding additives, and processed through the steps of mixing and sintering. When we talk about active lithium, we say that it has a spinel structure. This refers to the crystal shape used in lithium batteries. When lithium manganate is not used in lithium batteries, it has a layered structure. Relatively speaking, the spinel structure is more stable than the layered structure (although based on chemical properties, it seems that the stability of different shapes in the geometry can also be thought of), so the spinel structure is still used in actual use. In addition to lithium manganese oxide, lithium drill oxide and ternary lithium battery positive electrodes are also spinel structures, but the spinel structure of lithium manganese oxide is very distinctive compared with its two counterparts, namely: both advantages and disadvantages Very prominent. Its advantages are: low temperature resistance, good rate performance, and relatively easy preparation. The disadvantages are: the material itself is unstable and needs to be mixed with other materials, poor high temperature performance, poor cycle performance, and fast attenuation. These shortcomings of lithium manganate come from the characteristics of manganese. However, due to the widespread existence of manganese, it has a clear cost advantage. Because the lithium manganese oxide material has such distinctive characteristics, people can use its advantages and suppress its shortcomings to make lithium manganese oxide batteries used in different categories, usually referred to as two types of use, A and B. Type A refers to lithium-ion batteries used for power, focusing on safety and cycle performance. The requirement is that the reversible capacity is 100~115mAh/g, and it can maintain 80% capacity after 500 cycles. Class B is mainly used in consumer electronics (mobile phones). It is characterized by high capacity. The general requirement is that the reversible capacity is 120mAh/g, but the cycle performance only requires that the capacity be maintained at 60% after 300 to 500 times. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.