Explanation

A rechargeable battery that primarily relies on the potential difference between the positive and negative electrodes of lithium to store/release electrical energy. Li ion battery is mainly composed of positive pole, negative pole, separator and electrolyte. The electrode (including positive electrode and negative electrode) is the carrier for lithium ion insertion and removal, which is generally composed of active material particles, conductive additive and adhesive composition. The separator isolates the positive and negative electrodes, and elonrolyte is filled into the pores of the separator to transfer lithium ions. Its composition is generally lithium salt dissolved in organic solvent. The working principle of the Li ion battery is that during the charging process, the lithium ion and the electron move from the lower energy positive pole to the higher energy negative pole through the electrolyte and the external circuit respectively, and consume electric energy at the same time; The discharge process is the opposite, where lithium ions and electrons move from the negative electrode to the positive electrode through an electrolyte and an external circuit, respectively, while releasing electrical energy to drive the external circuit to do work. The energy density of Li ion battery depends on the voltage and specific capacity of its electrode materials. According to the different electrode materials selected, the current operating voltage of Li ion battery can be as low as 2.0V and as high as 4.5V. Compared with other secondary cell systems, Li ion battery has the advantages of high voltage, high energy density, long cycle life, low self-discharge rate, no memory effect, and environmentally friendly. Li ion battery have been widely used in mobile phones, notebook computers, consumer electronics and various electric vehicles. In the future, Li ion battery also have broad application prospects in the field of energy storage.

Classification