What is lithium manganate battery?

1. Manganic acid lithium battery Technical parameters.

(1) Output voltage range: 2.5 ~ 4.2V nominal capacity: 7500mah.

(2) Standard continuous discharge current: 0.2C.

(3) Maximum continuous discharge current: 1C.

(4) Operating temperature: charging: 0 ~ 45 ℃.

(5) Discharge: - 20 ~ 60 ℃.

(6) Lead model: national standard wire ul302 / 26#, wire length 50mm, white wire 10kntc.

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

(8) Overcharge protection voltage / 4.28 ± 0.025v per string.

(9) 2.4 ± 0.1V over discharge protection voltage.

(10) Overcurrent value: 2 ~ 4a.

Manganic acid lithium battery Plug in hybrid is still the main application field of the application system. It can not be ignored that there are 36 pure electric buses with lithium manganate as the main application, accounting for 17% of the supporting models of lithium manganate. Lithium manganate is the most widely used BAIC new energy in pure electric buses, followed by Xiamen Jinlong and CSR. In addition, Zhongtong, Yutong, Yangzi River, Ankai, Shenlong, Yaxing, etc. All began to use lithium manganate in pure electric buses.

2. Manganic acid lithium battery Energy density.

Lithium manganate is made from EMD (a raw material, which was once used as a special material for mercury free alkaline manganese battery) and lithium carbonate (also raw material) through mixing, sintering and other steps.

In addition to lithium manganate, the positive electrodes of lithium cobalt oxide and ternary lithium batteries are also spinel structures, but the two spinel structures of lithium manganate have a very distinctive character compared with these two types, that is, their advantages and disadvantages are very prominent. It has the advantages of 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 cycle performance and fast attenuation. These disadvantages of lithium manganate stem from the characteristics of manganese. However, due to the widespread existence of manganese, it has obvious cost advantages.

Because lithium manganate material has such distinctive characteristics, it is easy to use its advantages to restrain its disadvantages, so that lithium manganate battery can be used in different fields, usually called class A and class B. Class a refers to power batteries, focusing on safety and cycle performance. The reversible capacity is required to be 100 ~ 115mah / g, and 80% capacity can be maintained after 500 cycles. Class B is mainly used for consumer electronics (mobile phones), which is characterized by high capacity. Generally, the reversible capacity is required to be 120mAh / g, but the cycle performance only needs to maintain 60% capacity after 300 ~ 500 cycles.

3. Restricted manganic acid lithium battery Application factors

Lithium manganate material is used as negative electrode material in battery. Due to its own characteristics, the material and electrolyte are easy to interact, resulting in gas precipitation in the process of charge discharge cycle reaction. Therefore, ordinary manganic acid lithium battery It is easy to swell, resulting in battery bulging, greatly reducing the electrical performance and greatly reducing the theoretical cycle life of lithium manganate battery. The test data show that ordinary titanate lithium battery It will swell after about 1500-2000 cycles, resulting in failure of normal use, which is also an important reason restricting the large-scale application of lithium manganate battery.

Manganic acid lithium battery The improvement of properties is the comprehensive embodiment of the improvement of single material properties and the organic integration of key materials. According to the requirements of fast charging and long service life, in addition to the negative electrode material,lithium battery Other key raw materials (including cathode material, diaphragm and electrolyte) shall also be combined with special engineering process experience to finally form non flatulent lithium titanate lpto battery products, and first realize batch application on electric buses.

The test data show that under the conditions of 6C charge, 6C discharge and 100% DOD, the cycle life of lithium manganese titanate lpto single battery exceeds 25000 times and the remaining capacity exceeds 80%. At the same time, the flatulence produced by the battery is not obvious, which does not affect its service life; The practical application of fast charging pure electric bus also shows that after the battery is assembled, the electrical performance is also quite excellent, which can ensure the daily commercial operation of pure electric bus.

From a physical point of view, the meter energy level of material cost determines the voltage of its working platform. When graphite is used as negative electrode, the difference between graphite and metal lithium is 0.2 V, so iron phosphate lithium battery The operating voltage of lithium cobalt oxide battery is 3.2V, that of lithium manganate battery is 3.6V and that of lithium manganate battery is 3.8V. Nickel lithium manganate replaces a quarter of manganese, and the price state of nickel can be changed. What's the effect? Compared with lithium iron phosphate and ternary battery, the increase of voltage platform has advantages. As we all know, in today's post subsidy era, iron phosphate is very important for new energy vehicles and energy storage applications lithium battery Has the final say that the market has the final say, not the subsidy. It is well known that iron phosphate lithium battery The value of. At present, the maximum specific energy of lithium iron phosphate battery monomer is 180wh / / kg, and the battery pack reaches 150wh / kg. Recently, with further efforts of the bus battery project, the monomer can reach 200wh / kg and the system can reach 170wh / kg.

Then there is the price. The price of some single batteries reaches 0.6 ~ 0.7 yuan, which is very cheap. Compared with iron lithium, the same graphite negative electrode is used, and the battery voltage increases from 3.2 V to 4.5 V, with a one-time increase of more than 40%. Although the gram specific capacity of the material is slightly lower than that of iron lithium, the material density is much higher than that of iron lithium. The battery capacity of the same size is not lost to iron lithium, but the voltage increases by more than 40%. What does that mean? This means that its energy density is more than 40% higher than that of iron lithium battery, does not lose to ternary, and the cost is lower than that of iron lithium battery.