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What is a lithium manganate battery? What will be the impact of lithium manganate batteries

January 18, 2021

What is a lithium manganate battery? What will be the impact of lithium manganate batteries

 


Lithium batteries are ubiquitous in life. The editor has introduced lithium batteries such as 14500 lithium batteries, lithium iron phosphate batteries, and 26650 lithium batteries in previous articles. You can read the previous articles. In this article, the editor will describe the relevant content of lithium manganese oxide batteries. If you are interested in lithium batteries, you may wish to continue reading.

 

lithium battery


1. Technical parameters of lithium manganese oxide battery

Output voltage range: 2.5~4.2v Nominal capacity: 7500mAh


Standard continuous discharge current: 0.2C


Maximum continuous discharge current: 1C


Working temperature: charging: 0~45℃


Discharge: -20~60℃


Lead type: national standard line UL3302/26#, the line length is 50mm, the white line is 10KNTC


Protection board parameters: (each parameter can be set according to customer products)


Overcharge protection voltage / 4.28±0.025V per string


Over-discharge protection voltage 2.4±0.1V


Overcurrent value: 2~4A


The application system of lithium manganate battery still uses plug-in hybrid as the main application field. It should not be ignored that there are 36 pure electric bus models with lithium manganate as the main application, accounting for up to 17%. BAIC New Energy uses lithium manganate in the pure electric bus models the most, followed by Xiamen King Long and CSR. Zhongtong, Yutong, Yangzijiang, Ankai, Shenlong, Yaxing, etc., have all started in pure electric bus models. Application of lithium manganate.


Source: Internet finishing • Author: Anonymous • 2021 Nian 01 Yue 03 Ri 17:32 • 460 Read 0 times


Lithium batteries are ubiquitous in life. The editor has introduced lithium batteries such as 14500 lithium batteries, lithium iron phosphate batteries, and 26650 lithium batteries in previous articles. You can read the previous articles. In this article, the editor will describe the relevant content of lithium manganese oxide batteries. If you are interested in lithium batteries, you may wish to continue reading.


1. Technical parameters of lithium manganese oxide battery


Output voltage range: 2.5~4.2v Nominal capacity: 7500mAh


Standard continuous discharge current: 0.2C


Maximum continuous discharge current: 1C


Working temperature: charging: 0~45℃


Discharge: -20~60℃


Lead type: national standard line UL3302/26#, the line length is 50mm, the white line is 10KNTC


Protection board parameters: (each parameter can be set according to customer products)


Overcharge protection voltage / 4.28±0.025V per string


Over-discharge protection voltage 2.4±0.1V


Overcurrent value: 2~4A


The application system of lithium manganate battery still uses plug-in hybrid as the main application field. It should not be ignored that there are 36 pure electric bus models with lithium manganate as the main application, accounting for up to 17%. BAIC New Energy uses lithium manganate in the pure electric bus models the most, followed by Xiamen King Long and CSR. Zhongtong, Yutong, Yangzijiang, Ankai, Shenlong, Yaxing, etc., have all started in pure electric bus models. Application of lithium manganate.

 


2. Energy density of lithium manganate battery


Lithium manganate is produced from EMD (a raw material used as a unique material for mercury-free alkaline manganese batteries) and lithium carbonate (also used as a raw material), with corresponding additives, through mixing and sintering steps.


In addition to lithium manganese oxide, lithium cobalt oxide and ternary lithium battery positive electrodes are also spinel structures. Still, lithium manganese oxide's spinel structure is very distinctive compared with its two counterparts, namely: both advantages and disadvantages. Very prominent. Its benefits 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 obvious cost advantages.


Because the lithium manganate material has such distinctive characteristics, people can use its advantages and suppress its shortcomings to make lithium manganate batteries be used in different fields, usually referred to as two applications of type A and type B. Type A refers to power batteries, with emphasis 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. Type B is mainly used in consumer electronics (mobile phones), characterized by a high degree. The general requirement is that the reversible capacity is 120mAh/g, but the cycle performance only requires that the power be maintained 60% after 300 to 500 times.


Third, the factors restricting the application of lithium manganate batteries.


Lithium manganate material is used as harmful electrode material in the battery. Due to its characteristics, it is easy to interact with the electrolyte and produce gas during the charge and discharge cycle reaction. Therefore, ordinary lithium manganate batteries are prone to Flatulence will cause the battery core to bulge. The electrical performance will also be significantly reduced, which substantially reduces the lithium manganate battery's theoretical cycle life. The test data shows that ordinary lithium titanate batteries will have Flatulence after about 1500-2000 cycles, leading to failure in everyday use, which is also a fundamental reason for restricting lithium's large-scale application of manganate batteries.


The performance improvement of lithium manganate battery is a complete manifestation of individual materials' performance improvement and the organic integration of critical materials. In response to the requirements of fast charging and long service life, in addition to the harmful electrode material, other necessary raw materials of the lithium battery (including the positive electrode material, separator, and electrolyte), combined with the unique engineering process experience, finally formed no flatulence Lithium titanate LpTO battery products, and first realized the batch application on electric buses.


The test data shows that under the conditions of 6C charge, 6C discharge, and 100% DOD, the cycle life of the lithium manganese titanate LpTO battery exceeds 25000 times, the remaining capacity exceeds 80%, and the Flatulence generated by the storm is not apparent. It affects its life. The actual application of fast-charging pure electric buses also shows that after the batteries are assembled, the electrical performance is also quite excellent, ensuring the daily commercial operation of pure electric buses.


From a physical point of view, the Fermi level of the material determines its working platform voltage. When graphite is used as the negative electrode, the difference between lithium metal and lithium is 0.2 volts, so the working voltage of lithium iron phosphate battery is 3.2V, and the operating voltage of lithium cobalt oxide battery is 3.6 volts. Lithium manganate is 3.8V. Lithium nickel manganate replaces a quarter of the manganese with nickel. The valence state of nickel can change. What are the effects? It increases the voltage platform, which has advantages over lithium iron phosphate and ternary batteries. Everyone knows that lithium iron phosphate batteries have become more valuable for new energy vehicles and energy storage applications in the post-subsidy era today. Finally, when the market starts to have the final say instead of subsidies. Everyone knows the value of lithium iron phosphate batteries. At present, the maximum specific energy of lithium iron phosphate battery cells can reach 180Wh/Kg, and the battery pack has gained 150Wh/Kg. Recently, the bus battery project can work harder to achieve 200Wh/Kg. The system should be 170Wh/Kg; I want to see how high the ternary battery pack can be. This is very interesting, and then the price of a single battery is 0.6~0.7 yuan, which is very cheap. Coupled with long life and high safety, how does Sanyuan compete with iron and lithium? I think this material has an excellent opportunity. Because compared with iron-lithium, graphite anode is also used, and the battery voltage rises from 3.2 volts to 4.5 volts, increasing more than 40%. Although the material's specific capacity is slightly lower than that of iron-lithium, the material density is higher than that of iron-lithium. It is much higher. The same size's battery capacity is not less than that of iron-lithium, but the voltage is increased by more than 40%. What does it mean? It means that its energy density is more than 40% higher than that of iron-lithium batteries, not losing to the three yuan, and the cost is lower than that of iron-lithium batteries.