A battery pack contains one or more identical battery cells. Each battery is stored in two electrodes, and the positive electrode and the negative electrode are separated from the diaphragm. The chemical reaction between the electrodes involves various complex reactions of ions and electrons. During the charge and discharge process, the ion is switched from the positive and negative electrolyte by electrolyte, and the electrons are forced to pass through the external circuit. In rechargeable batteries, chemical reactions are reversible.
The choice of solvent is originally mainly based on the conductivity of the salt solution, the classic example is propylene carbonate (PC), but it quickly found that the PC-based solution causes a decrease in lithium electrode cycle due to uncontrollable passivation phenomena.
Therefore, some solvent mixtures were screened. At present, a mixture of high dielectric solvents (i.e. (Ie, dimethyl ethane (DME) or methylmethoic acid NJ (MF) to ensure sufficient conductivity.
Other solvent mixtures have also been found to optimize the performance of the carbon-based negative electrode battery. Considering the role of collagenization, the reaction of the electrode is generally affected by the passivation film performance, and is also associated with the type and composition of the selected electrolyte solution.
The electrolyte of a lithium ion battery made of graphite is usually selected from the solution of LiPF6 or UN (CFSO) in an EC-PC or an EC-DMC mixed solvent. For the coke electrode of the disorderless structure, the embedding process does not promote the formation of the fractionation, and these electrodes are not sensitive to the performance of the electrolyte like the crystal stone electrode, for example, the PC containing electrolyte, it is easy to make the graphite electrode, but can Since it is successfully applied to the coke electrode.
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