The electrolyte is composed of a solvent and a supporting electrolyte

    The electrolyte is composed of a solvent and a supporting electrolyte. After normal decomposition, insoluble products such as Li2Co3 and LiF are usually formed, which reduce the battery capacity by blocking the pores of electricity. The reduction reaction of the electrolyte can have adverse effects on the capacity and cycle life of the battery, and the gas generated by reduction can increase the internal pressure of the battery, leading to safety issues. The electrolyte has low adhesion to graphite and other lithium embedded carbons, and easily reacts to produce irreversible capacity. During charging and discharging, the decomposition of electrolyte will form a passive film in the form of electricity, which can separate the electrolyte from the carbon negative and prevent further decomposition of the electrolyte. So as to maintain the structural stability of carbon negative. The reduction limit of the electrolyte under the premise of fantasy occurs during the formation stage of the passivation film, and this process no longer occurs after the cycle is firmly established. The reduction of electrolyte salts participates in the formation of the passivation film, which is beneficial for the firm solidification of the passivation film. However, the insoluble substances generated by the reduction have adverse effects on the solvent reduction products. Moreover, the concentration of electrolyte decreases during the reduction of electrolyte salts, resulting in the loss of battery capacity (LiPF6 reduction produces LiF, LixPF5-X, PF3O, and PF3). At the same time, the formation of the passivation film consumes lithium ions, which can lead to capacity imbalance between the two and result in a decrease in the specific capacity of the battery. The type of carbon used in the process, the composition of the electrolyte, and the additives in the electricity or electrolyte are all factors that affect the loss of film-forming capacity. Electrolytes often contain substances such as oxygen, water, and carbon dioxide.

    Trace amounts of water have no effect on the performance of graphite motors, but excessive water content can generate LiOH (s) and Li2O deposition layers, which are not conducive to lithium ion insertion and cause irreversible capacity loss: H2O+e → OH -+1/2H222 OH -+Li+→ LiOH (s) LiOH+Li++e → Li2O (s)+1/2H2. CO2 in the solvent can be reduced to CO and LiCO3 (s) on the negative side: 2CO2+2e+2Li+→ Li2CO3+COCO will increase the internal pressure of the battery, while Li2CO3 (s) will increase the internal resistance of the battery and affect its function.

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