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Characteristics of cathode materials for lithium-ion batteries

by:dcfpower     2021-03-16
The difference between lithium-ion batteries and other batteries Compared with nickel-hydrogen batteries, the charge-discharge voltage of lithium-ion batteries is higher, about 3 times that of nickel-hydrogen batteries, at 3.7 V, while the charge-discharge voltage of nickel-hydrogen batteries is 1.2 V. Compared with lithium metal batteries, both have higher volume ratio energy and mass ratio energy, but relatively speaking, the stability of lithium ion batteries is better than lithium metal batteries. For the past lead-acid batteries and nickel-cadmium batteries, their performance and stability are not as good as the currently widely used lithium-ion batteries, and they are gradually being replaced by lithium-ion batteries and fuel cells. In addition, the volume specific energy and mass specific energy of lithium-ion batteries are higher than that of nickel-hydrogen batteries. In terms of working principle, lithium-ion batteries are different from other batteries. For example, in a lead-acid battery system, the reactant is an electrolyte, while for lithium ion Batteries actually pass through the electrolyte between the positive and negative electrodes. Both the positive and negative electrodes are made of embedded materials. The electrolyte is easily transferred between the positive and negative electrodes. Therefore, the lithium-ion battery also has a name called a swing battery.'   The working principle of lithium-ion batteries The working principle of lithium-ion batteries is relatively simple. During discharge, some lithium ions will be separated from the negative electrode material and enter the electrolyte solution, and the same amount of lithium ions will be inserted into the positive electrode material in the electrolyte. In the external circuit, electrons will flow from the negative electrode to the positive electrode at the same time to supply power to the load and provide energy. Lithium-ion batteries can also carry out a reversible charging process, which occurs when there is current or external voltage on the positive and negative electrodes When loading. The characteristics of lithium battery pack cathode materials After the first proposal and advent of lithium-ion batteries, research on cathode materials has been going on. Various new cathode materials with low cost and good performance have been widely studied and discussed. The cathode materials of lithium-ion batteries must meet the following requirements: ①Easy to synthesize and low cost; ②Low pollution to the environment; ③Strong stability when in contact with electrolyte; Strong conductivity; ⑤When lithium ions are transferred in the electrolyte, they must be able to quickly react with lithium ions during insertion and extraction of the cathode material; ⑥It must be able to react with lithium ions in a reversible chemical reaction; ⑦ Must be able to oxidize The reduction reaction contains transition metal elements. After meeting the above requirements, the dynamic and thermodynamic properties of the embedded battery system need to be considered for the design of the new cathode material. The morphology and structure of the cathode material are also required in the design. Factors to be considered.    The influence of particle size on the electrochemical performance of the cathode material The diameter, density, morphology and distribution of the material particles have a great influence on the kinetics of the battery cathode, and it plays a role in the stability and electrochemical performance of the battery. It plays an important role. For example, spherical crystal grains gather to form a single spinel spherical crystal grain, which will enhance the cycle performance of the battery. The smaller particle diameter can make the chemical reaction more rapid. This is because the ions and electrons are in the material. The diffusion path will shorten as the particle diameter decreases, but too small particle size also has corresponding disadvantages. For example, lower tap density will cause too low energy density and poor thermal stability. During the reaction, the reaction activity will decrease. In continuous research and analysis, various synthesis methods will synthesize material particles of different sizes. The proper particle size and morphology will make the performance of the lithium ion battery more superior.u003c/pu003e
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For details on custom lithium ion battery, see Shenzhen Chuangneng Ruiyuan Electronics CO.,LTD. at Ruiyuan Electronics.
Shenzhen Chuangneng Ruiyuan Electronics CO.,LTD.’s model also predicts (i) a positive effect of management on firm performance; (ii) a positive relationship between product market competition and average management quality (part of which stems from the larger covariance between management with firm size as competition strengthens); and (iii) a rise (fall) in the level (dispersion) of management with firm age.
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