Introduction to Lithium Manganate Lithium Manganate Battery Introduction

Lithium manganate, a positive electrode material with good synthesis performance and stable structure, is the key to lithium ion battery electrode materials. Lithium manganate is one of the promising lithium ion cathode materials. However, its poor cycle performance and electrochemical stability greatly limit its industrialization, and doping is an effective method to improve its performance. Metal ions doped with strong M-O bonds, strong octahedral stability and similar ionic radius to manganese ions can significantly improve their cycle performance. The biggest advantage of lithium manganate and lithium cobaltate, ternary and other cathode materials is that the price is cheap, the biggest disadvantage is the low capacity (only can be played to 100-110, Henan thinking typical value: 105), not too good pressure It is a transition product of lithium cobaltate and ternary materials. The research on the specific surface area of lithium manganate is very important. The specific surface area detection data of lithium manganate is only true and reliable by the BET method. There are many domestic the instrument can only be tested by direct comparison method, and now it has been eliminated in China. At present, the specific surface area test at home and abroad adopts the multi-point BET method. The specific surface area measurement standards developed at home and abroad are based on the BET test method. Please refer to the national standard (GB/T19587-2004) - Determination of gas adsorption BET principle a method of specific surface area of solid materials. The specific surface area detection is actually a relatively time-consuming task. Due to the different adsorption capacity of the sample, some samples may take a whole day to test. If the test process is not fully automated, the tester cannot leave at all times. High concentration, observing the dashboard, and manipulating the knobs, a little inattention will lead to the failure of the test process, which will waste a lot of valuable time for the testers. The truly fully automated intelligent surface area tester products meet the international standards of the test instrument industry. All the similar international products are fully automated, and the manually operated instruments have already been eliminated abroad. The truly fully automated intelligent surface area analyzer product frees testers from repetitive mechanical operations, greatly reducing their work intensity, training is simple, and work efficiency is improved. The truly fully automated intelligent specific surface area measuring instrument product greatly reduces the error caused by human operation and improves the test accuracy. The F-Sorb2400 specific surface area tester is an instrument that can truly realize the BET detection function (both direct contrast method). The more important F-Sorb2400 specific surface area tester is the only fully automated and intelligent specific surface area inspection equipment in China. The test results are highly consistent with international standards, and the stability is also good, while reducing human error and improving the accuracy of test results.

Lithium battery cathode material comparison

Lithium cobaltate

Advantages: The first generation of commercial lithium-ion battery cathode materials, there are many irreplaceable advantages: the material has good processing performance, high density, relatively high specific capacity, stable material structure, good cycle performance, material voltage the platform is relatively high and stable, and it is the most mature and the only commercial cathode material. It has an irreplaceable advantage in a short period of time, especially in the field of communication batteries.

Disadvantages: The high price, the almost unlimited capacity, the shortage of resources, and the poor security make it inevitably suffered the fate of being replaced in the last 5 to 10 years. Now there are two directions for replacing lithium cobalt oxide materials. One is in the field of power batteries, lithium manganate and lithium ferrite are the most promising materials, and the other is in the field of communication batteries, nickel-cobalt-lithium and nickel-cobalt-manganese-lithium. The material is the most promising alternative to lithium cobalt oxide.

2. Lithium iron phosphate

Advantages: low price, high safety performance, good structural stability, and superior cycle performance make it a broad application prospect as a power battery and backup power supply field.

Disadvantages: low tap density, low volume specific capacity, low conductivity, poor low-temperature discharge performance, poor rate discharge and other issues need to continue to study and improve

3. Nickel cobalt manganese

Advantages: The material with relatively high capacity has a specific capacity higher than that of lithium cobaltate by more than 30%, and has the same upper and lower limit voltages as lithium cobaltate, which is relatively easy to use on a large scale and relatively inexpensive. The safety is relatively good, the price is relatively low, the compatibility with the electrolyte is good, and the cycle performance is excellent. It is the battery positive electrode material which is most likely to be applied simultaneously in the small communication and small power fields, and even in the large power field possible.

Disadvantages: The synthesis of materials is relatively difficult, the density of materials is relatively low, the voltage platform of the material is low, the charge and discharge efficiency is low, and the compatibility and poor safety of the electrolyte are still to be solved.

Comment: The high capacity and high security of this material is unmatched by other materials and will be brought to market in the last few years. With the deepening of research, industrialization will develop rapidly in the last two years.

4. Lithium manganate

Advantages: Through years of research, the performance of materials has been greatly improved. Its high security and low price make it have broad application prospects in the field of power batteries.

Disadvantages: The specific capacity is relatively low and the high temperature cycle is low.

Comment: Through the research in recent years, the cycle performance of modified lithium manganate has been improved to some extent, and the specific capacity has been improved. High temperature performance has been well resolved, accelerating the pace of industrialization. The high safety of modified lithium manganate in the field of power batteries, low price, and superior density of iron and lithium make it the most promising power battery material. It will become the main substitute for lead-acid batteries in the next five years, becoming the main starting power source, UPS power source and backup power source, becoming the leader of secondary batteries.

Modified lithium manganate - perfect single crystal octahedron.

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