no. 7 alkaline battery

Analysis of no. 7 alkaline battery capacity

Battery capacity is one of the important performance indicators of lithium-ion batteries. It indicates the amount of electricity stored in lithium-ion batteries under certain conditions. It is usually measured in Ah (ampere-hour) or mAh (milliampere-hour) (1Ah=1000mAh). The important method for obtaining no. 7 alkaline battery capacity parameters is to integrate the current over time when the battery is discharged from 100% SOC to 0% SOC (that is, within the detection voltage range), that is, where Q is the battery capacity (Ah), I is the current (A), and t is the detection time (h). 1 milliampere-hour is equivalent to 3.6 coulombs.

In general, capacity data can be read directly in the detection system software. For the battery materials being tested, capacity analysis generally requires the determination of three data: first charge capacity, first discharge capacity (positive electrode material), and reversible capacity.

a. The first charge capacity is the charge capacity of the no. 7 alkaline battery at the end of the first charge;

b. The first discharge capacity is the discharge capacity of the no. 7 alkaline battery at the end of the first discharge;

c. The reversible capacity is the capacity value after the battery cycle stabilizes (the test value at room temperature is also called the rated capacity)

Generally, the discharge capacity of the 3rd to 5th week is selected, and sometimes the discharge capacity after 10 weeks may be selected. In practical applications, the analysis of the gram capacity, surface capacity and volume capacity of the test material or electrode is more valuable for reference. For example, the gram capacity is the discharge capacity per unit mass of active material, C=Q/m; the surface capacity is the discharge capacity per unit area of the test electrode, C=Q/S; the volume capacity is the discharge capacity per unit volume of the electrode, C=Q/V. In the formula, C is the discharge capacity mAh/g (milliampere-hour per gram), mAh/cm2 (milliampere-hour per square centimeter) or mAh/cm3 (milliampere-hour per cubic centimeter), Q is the discharge capacity mAh (milliampere-hour), m is the mass of the active material g (gram), S is the area of the test electrode cm2 (square centimeters), and V is the volume of the test electrode cm3 (cubic centimeters). The gram capacity parameter is more intuitive for comparing the performance of test materials, while the surface capacity and volume capacity are more valuable for reference when the positive and negative electrode capacities are matched in the actual application of the test materials. It is recommended to provide information on all three specific capacities when publishing an article.

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