What are the factors that will affect the charge discharge ratio of lithium battery?

　　1. The charge discharge rate performance of lithium ion battery is directly related to the migration ability of lithium ion on the positive and negative electrodes, electrolyte and their interfaces. All factors that affect the migration rate of lithium ion (these factors can also be equivalent to the internal resistance of the battery) will affect the charge discharge rate performance of lithium ion battery. In addition, the heat dissipation rate inside the battery is also an important factor affecting the rate performance. If the heat dissipation rate is slow, the heat accumulated in the process of large capacity charging and discharging cannot be transferred, which will seriously affect the safety and service life of lithium ion batteries. Therefore, it is of great significance to study and improve the charge discharge rate performance of lithium ion batteries, improve the migration rate of lithium ions and the internal heat dissipation rate of batteries. For the internal resistance of lithium ion batteries, conductive agents are usually added inside the positive active materials to reduce the contact resistance between the active materials and between the active materials and the positive base collector, improve the conductivity (ionic and electronic conductivity), and improve the utilization and performance of the positive materials. Different materials and different shapes of conductive agents will affect the internal resistance of lithium ion batteries, and then affect their amplification performance. The collector (lug) of the positive and negative electrodes is the carrier of energy transfer between the lithium ion battery and the outside world. The collector resistance also has a great influence on the amplification performance of the battery. Therefore, the multiplying performance and cycle life of lithium ion battery can be improved by changing the material, size, extraction method and connection process of the collector.

　　2. In addition, the liquid absorption rate and porosity of the isolation membrane also have a great impact on the lithium ion trafficability, and will also affect the rate performance of the lithium ion battery to a certain extent (relatively small). The penetration degree of electrolyte and positive and negative electrode materials of lithium ion battery will affect the contact resistance of the interface between electrolyte and electrode, thus affecting the multiplying performance of the battery. The total amount, viscosity, impurity content of electrolyte and the pores of positive and negative electrode materials will change the contact impedance between electrolyte and electrode, which is an important research direction to improve the amplification performance. The ionic conductivity of electrolyte The ionic conductivity of electrolyte is the same as the resistance of water, which has a great influence on the swimming speed of lithium ions. At present, the ionic conductivity of organic electrolytes used in lithium ion batteries, whether liquid or solid, is not very high. The electrolyte resistance has become an important part of the whole battery resistance, and its impact on the high rate performance of lithium ion batteries cannot be ignored. In addition to improving the ionic conductivity of the electrolyte, we should also pay attention to the chemical and thermal stability of the electrolyte. When charging and discharging at a large rate, the electrochemical window of the battery has a wide range. If the chemical stability of the electrolyte is not good, it is easy to oxidize and decompose on the surface of the cathode material, affecting the ionic conductivity of the electrolyte. Diffusion capacity of positive and negative lithium ion batteries The rate at which lithium ion batteries are deinterbedded and embedded in the positive and negative active materials, that is, the rate at which lithium ions escape from the positive and negative active materials, or the rate at which they enter the active materials from the positive and negative surfaces to find a stable place, is an important factor affecting the charge discharge ratio.

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