Research on the Performance Test of Lithium Ion Battery Anode Based on Energy Density Optimization Technology of Layered Cathode Material

Abstract

Lithium-ion capacitor batteries have the advantages of both lithium-ion batteries and supercapacitors. Lithium battery cathode materials have problems such as irreversible structural transformation during cycling, resulting in high initial irreversible capacity loss, poor rate performance, energy decay and voltage decay. The design and selection of lithium-source cathode materials are particularly important for the development of lithium-ion batteries. The cathode material LiNi <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$_{8}\mathbf{Co}_{0.15}\mathbf{Al}_{0.05}\mathbf{O}_{2}$</tex> is a hot topic of current research. It has other features such as high storage capacity, low cost, low toxicity, and good safety, and is considered to be a good replacement for LiCoO2 as the cathode material. However, when the ternary cathode material is charged, it will have an adverse chemical reaction with the electrolytic cell, resulting in its structural instability, so that its resistance, cycle and rate performance become poor, and coating modification is to solve these problems. one of the methods. The coating modification can hinder the side reaction between the electrolytic cell and the positive electrode material, thereby improving the transmission efficiency of lithium ions and reducing the impedance of the positive electrode material. The source of the cathode material LiNi <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$_{8}\mathbf{Co}_{0.15}\mathbf{Al}_{0.05}\mathbf{O}_{2}$</tex> in this paper is obtained by using the co-precipitation method in oxygen under the most ideal conditions-high temperature solid phase method. In this paper, LiNi <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$_{8}\mathbf{Co}_{0.15}\mathbf{Al}_{0.05}\mathbf{O}$</tex> is used as the research object. First, the hydroxide precursor is prepared by co-precipitation method, and then a layer of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{Ni}_{1/3}\mathbf{Co}_{1/3}\mathbf{Mn}_{1/3}(\mathbf{OH})_{2}$</tex> is coated on the surface of the precursor., get the cathode material with shell structure, and then use XRD, SEM, EDX, electrochemical test and other analysis methods to study its structure, morphology and electrochemical performance and other properties. The research results show that under different magnifications, the weakened amount of the coated cathode material is significantly lower than that of the uncoated cathode material. It can be determined that the electrochemical performance of the lithium-ion battery can be increased by coating the cathode material.