-(2)Introduction to the Advantages and Disadvantages of Lithium Manganate Batteries

(2)Introduction to the Advantages and Disadvantages of Lithium Manganate Batteries
author:enerbyte source:本站 click279 Release date: 2023-11-16 10:42:11
abstract:
(3) Spinel lithium manganese oxide Li2Mn2O4, with low voltage (3V), low customer volume, and poor circulation, are all being studied on how to prevent the occurrence of such things. Ternary: In order to solve the defects of layered lithium manganate, Ni and Co (Al) were invented by doping meta...

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(3) Spinel lithium manganese oxide Li2Mn2O4, with low voltage (3V), low customer volume, and poor circulation, are all being studied on how to prevent the occurrence of such things. Ternary: In order to solve the defects of layered lithium manganate, Ni and Co (Al) were invented by doping metal elements to replace the strong ternary material LiNiCoMnO2 (LiNiCoAlO2). This method takes into account the high capacity and voltage of nickel acid burial, the high voltage and safety of lithium manganate, the good cycling performance of lithium manganate, and overcomes the difficulties and instability in the synthesis of lithium manganate and lithium nickel oxide, as well as the high cost of lithium manganate. It has become the current mainstream positive electrode material. Theoretical capacity 280mA-h/g, voltage

2.7~4.2, the actual capacity now produced is around 160mA-h/g.

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 previously used as a specialized 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.

When we talk about lithium manganese oxide, we say it has a spinel structure, which refers to its crystal shape applied to lithium-ion batteries. When lithium manganese oxide is not applied to lithium-ion batteries, there is also a layered structure. Relatively speaking, the spinel structure is more stable than the layered structure (although based on chemical properties, it seems that stability of different shapes in geometry can also be imagined), so the spinel structure is still used in practical applications. In addition to lithium manganate, the positive electrode of lithium drilling acid and ternary lithium-ion batteries also have a spinel structure. However, lithium manganate, a spinel structure, has a very distinct personality compared to its two peers, with outstanding advantages and disadvantages. Its advantages are: low temperature resistance, good rate performance, and 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 attenuation. These drawbacks of lithium manganese 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 use their advantages and suppress their disadvantages, making it suitable for different fields, commonly referred to as Class A and Class B applications. Class A refers to lithium batteries used for power, with a focus on safety and cycling performance. The requirement is that the reversible capacity should be between 100-115mAh/g, and 80% capacity can be maintained after 500 cycles. Class B is important for consumer electronics (mobile phones), characterized by high capacity. The general requirement is a reversible capacity of 120mAh/g, but the cyclic performance only requires maintaining 60% capacity after 300-500 cycles.

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