button battery cr1620

Overview of the physical and chemical properties of organic liquid electrolytes for button battery cr1620

The organic liquid electrolyte used in button battery cr1620 is an electrolyte solution formed by dissolving appropriate lithium salts in an organic aprotic mixed solvent. For the convenience of expression, this book will refer to it as organic electrolyte or electrolyte.

Common organic liquid electrolytes are generally systems consisting of 1 mol/L lithium salt/mixed carbonate solvent. As a medium for transferring charge and mass, the electrolyte suitable for button battery cr1620 should generally meet the following requirements:

A. High conductivity in a wide temperature range, preferably above ((1~2)X10-3S/cm, and the lithium ion migration number is as high as possible;

B. Wide liquid temperature range (liquid range), at least liquid in the range of -20~80℃;

C. Good chemical stability, basically no reaction with electrode active materials (such as positive and negative electrode materials), current collectors, diaphragms, etc.;

D. Good compatibility with electrode materials, and can form a stable and effective passivation film; E. Good electrochemical stability, high decomposition voltage, to reduce the self-discharge of the battery and the increase in the internal pressure of the battery during operation;

F. High flash point and ignition point, good safety; G. Environmental friendliness, the decomposition products have little impact on the environment. The above requirements are important guarantees for achieving low internal resistance, long life and high safety of button battery cr1620. The selection of lithium salts, organic solvents and the optimization of electrolyte solutions determine the battery's cycle efficiency, operating voltage, operating temperature and storage period, which are one of the key technologies for developing button battery cr1620.

In a sense, the liquid electrolyte of button battery cr1620 plays a decisive role in battery performance.

After decades of research and practice, the electrolyte used in button battery cr1620 has basically taken shape. Commercial electrolytes generally choose LiPF6 as lithium salt, and the solvent is mostly a mixed solvent composed of ethylene carbonate (EC) and dimethyl carbonate (DMC) or diethyl carbonate (DEC). In addition, there are a small number of electrolyte systems used for special purposes. These electrolyte systems support the commercialization of button battery cr1620 and future research and development.

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