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Analysis of the impact of lithium ion battery life

From:CTECHI GROUP Limited     Release time:2019-10-11

Overview:Lithium-ion battery charge and discharge cycle process is a complex physical and chemical reaction process, and its cycle life influence factors are various. On the one hand, it is related to the characteristics of the battery itself, such as design, manufacturing process and material performance degradation; on the other hand, it is related to the external influence of the battery during use, such as the use environment and charging and discharging system.

Analysis of the impact of lithium ion battery life

1. Many factors

Lithium-ion battery charge and discharge cycle process is a complex physical and chemical reaction process, and its cycle life influence factors are various. On the one hand, it is related to the characteristics of the battery itself, such as design, manufacturing process and material performance degradation; on the other hand, it is related to the external influence of the battery during use, such as the use environment and charging and discharging system.

2. Application scenario

With the development of technology and the maturity of technology, the application of lithium-ion battery customization has become more and more extensive. The faster the battery capacity is attenuated under the same conditions, the battery quality is relatively poor. Lithium-ion batteries have the advantages of high cell voltage, relatively low mass, and environmental friendliness. However, after a plurality of cycles of charge and discharge cycles, the performance such as battery capacity may decrease. The cycle performance of lithium-ion batteries is an important indicator of their quality. Many standards for lithium-ion batteries have a cycle life.

3, lithium ion battery custom structure and principle introduction

Before the lithium-ion battery is customized for the first time, during the charging and discharging process of the battery, a passivation film can be formed on the phase interface between the negative electrode and the electrolyte. It acts as a membrane between the electrode and the electrolyte. It is an excellent insulator of lithium ion. The lithium ion can be freely embedded and removed through the passivation layer. It has the characteristics of a solid electrolyte, so this passivation film It is called "solid electrolyte interface film", referred to as SEI. Lithium-ion battery customization is mainly composed of positive and negative materials, electrolyte, separator, current collector and battery casing. The positive and negative materials are composed of two different lithium ion intercalation compounds. When charging, lithium ions are deintercalated from the positive electrode and inserted into the negative electrode through the electrolyte through the separator, and the opposite is true when discharging.


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