Technical analysis of cathode material performance of 4LR44 battery phosphate and lithium manganate batteries

　　Technical analysis of cathode material performance of 4LR44 battery phosphate and lithium manganate batteries. Lithium-ion batteries are increasingly used in mobile phones, notebook computers, digital cameras, electric vehicles, etc. due to their advantages such as high energy density, low self-discharge current, high safety, large current charge and discharge, high number of cycles, and long life. Automobiles, special aerospace, special equipment and other fields. The lithium battery industry has become one of the important industrial directions for the development of the national economy. Today we will analyze the performance technology of 4LR44 battery phosphate and lithium manganate battery cathode materials that have been studied in recent years.

　　4LR44 battery phosphate battery cathode material performance technical analysis

　　1. The cathode material should have a higher redox potential, so that the battery has a higher output voltage;

　　2. During the lithium ion intercalation/deintercalation process, the structure of the cathode material should change as little or as little as possible to ensure good cycle performance of the battery;

　　3. The redox potential of the positive electrode should change as little as possible during the intercalation/deintercalation process of lithium ions, so that the voltage of the battery does not change significantly to ensure smooth charging and discharging of the battery;

　　4. The positive electrode material should have high conductivity, which can charge and discharge the battery with high current;

　　5. Lithium ions should have a large diffusion coefficient in the electrode material to facilitate rapid charging and discharging of lithium batteries.

　　4LR44 battery phosphate has abundant raw materials, is relatively cheap compared to other materials, is environmentally friendly, and has good cycle performance and high safety, making it the first to be used in electric vehicles. However, the 4LR44 battery phosphate material has poor electrical conductivity and low tap density, resulting in low volume energy density, limiting its further application.

　　Lithium manganate battery cathode material performance technical analysis

　　Lithium manganate has spinel type and layered type, and the main type is spinel type lithium manganate. Compared with lithium cobalt oxide, it has the characteristics of abundant resources, low price, low environmental pollution and excellent safety performance. However, this battery still has the problems of low initial specific capacity and rapid capacity fading after repeated use at high temperatures. The theoretical capacity of spinel structure lithium manganate is about 148mAhg-1, and the practical capacity is 90-120mAhg-1. The normal operating voltage is 3-4V, but within the charge and discharge range of 3V, the insertion and detachment reaction of Li+ The reversibility is poor, the spinel structure is difficult to maintain integrity, and the cycleability is poor. In addition, during high-temperature cycles, the material's capacity fades seriously due to the dissolution of manganese in the electrolyte and the Jahn-Teller effect.

　　Due to the high content of elements in the main element composition analysis, if conventional analysis methods of low-content impurity elements are used, large errors are likely to occur. Therefore, titration method is usually used for bulk element analysis. The method studied is to determine the nickel content in the cathode material by diacetyl oxime precipitation-EDTA titration in the presence of a large amount of interfering elements manganese and cobalt. Research results show that the standard deviation of this method is less than 0.054, the coefficient of variation is less than 0.20%, and the recovery rate is between 99.63% and 100.5%.

　　For lithium manganate cathode materials, YS/T798-2012 specifies the test methods for the first discharge specific capacity, first charge and discharge efficiency, platform capacity ratio and cycle life of lithium nickel cobalt manganate.

　　There are many analysis methods for the physical and chemical properties and application performance of materials. Screening and determining the analysis methods suitable for the properties of lithium-ion battery cathode materials will help lithium-ion battery cathode material workers accurately analyze the properties of their own materials, and will also help different lithium-ion batteries. Comparison of data between cathode material workers is of great significance in promoting the development of cathode materials for lithium-ion batteries.

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