CR2032 button cell batteries

　　What is the core technology of CR2032 button cell batteries?

　　Lithium batteries are representatives of modern high-performance batteries and are composed of four main parts: positive electrode material, negative electrode material, separator, and electrolyte.

　　The separator is an important component of the lithium battery pack and an important component that supports the electrochemical process of charging and discharging the lithium-ion battery. It is located between the positive and negative electrodes inside the battery, ensuring the passage of lithium ions while blocking electron transmission. The performance of the separator determines the interface structure, internal resistance, etc. of the battery, which directly affects the battery's capacity, cycle, safety performance and other characteristics. Excellent separators play an important role in improving the overall performance of the battery.

　　Electrolyte, lithium battery electrolyte is generally a mixture of high dielectric constant cyclic carbonate and low dielectric constant linear carbonate. Generally speaking, the electrolyte of lithium-ion battery should meet the requirements of high ionic conductivity (10-3~10-2S/cm), low electronic conductivity, wide electrochemical window (0~5V), and good thermal stability (-40~60℃ ) and other requirements. Lithium hexafluorophosphate and other new lithium salts, solvent purification, electrolyte preparation, and functional additive technology continue to advance. The current development direction is to further increase its operating voltage and improve the high and low temperature performance of the battery. Safe ionic liquid electrolytes and solid electrolytes are under development.

　　The negative electrode materials that can be used in CR2032 button cell batteries packs include graphite, hard/soft carbon and alloy materials. Graphite is currently a widely used negative electrode material, and its reversible capacity can reach 360mAh/g. Amorphous hard carbon or soft carbon can meet the needs of batteries for higher rate and lower temperature applications and is beginning to be used, but it is mainly mixed with graphite. Lithium titanate anode material has optimal rate performance and cycle performance and is suitable for high-current fast-charging batteries, but the battery produced has low specific energy and high cost.

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