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Development of needle-shaped lithium battery CR425

by:dcfpower     2021-02-20
u003cpu003eTurn to summary: Use Li-MnO2 battery materials and technology to manufacture CR425 lithium battery. Focus on the preparation of positive electrode active material and battery assembly technology for testing and improvement. The XRD test tested electrolytic manganese dioxide (EMD) before and after heat treatment. ), the prepared battery was discharged at different temperatures with constant current and constant resistance, and the open circuit voltage, short circuit current, internal resistance and discharge capacity of the battery stored for 1 week, 3 months and 6 months were tested. The results show that the battery performance fully meets the technical requirements of the CR425 lithium battery pack, and can be used as a light-emitting buoy for fishing at night or as a lighting power source for commercial pens at night. u003c/pu003eu003cpu003eWith the rapid development of the electronics industry, batteries are called the heart of electronic products, and their status in the development of the national economy and people's lives is becoming more and more important. Li-MnO2 batteries have the characteristics of high voltage, high energy density, wide operating temperature range, good storage performance and cheap raw materials, so they are widely used in various household appliances, industrial equipment and military equipment. At present, there is a kind of BR425 needle-shaped lithium battery matched with light-emitting diodes on the market, which is used as a light-emitting buoy for fishing enthusiasts at night or as a lighting power source for business general-purpose pens at night. )n, high specific energy, no gas evolution during storage, low self-discharge electrode, good safety performance, but solid carbon fluoride (CFx)n is not as convenient and cheap as Li-MnO2 battery cathode material electrolytic manganese dioxide source, battery The production process is not as mature as the Li-MnO2 battery process. Therefore, the author uses electrolytic manganese dioxide as the positive electrode material to manufacture the CR245 needle-shaped lithium battery pack. The heat treatment of EMD, the production process and the battery assembly are tested, and the battery performance is tested. (1) The internal heating type rotary furnace is used to process EMD. XRD test proves that EMD is transformed from mainly γ-phase MnO2 to γ- and β-mixed MnO2, which meets the requirements of lithium manganese battery cathode active material. (2) The CR425 lithium battery is made using EMD as the cathode material. When the battery is stored at room temperature for 1 week and is continuously discharged with a constant current of 0.5mAh, the discharge capacity reaches or exceeds the rated capacity at 50℃ and 20℃. It can discharge 90% of the rated capacity at ℃, and about 70% of the rated capacity at -10℃; the result of continuous discharge with 5KΩ constant resistance is basically the same as that at constant current. (3) After the battery is stored at room temperature for 3 to 6 months, the open circuit voltage and discharge platform voltage decrease slightly, the internal resistance increases significantly, and the short-circuit current decreases greatly, but the battery can still be discharged under constant current 0.5mAh discharge at room temperature More than 98% of the rated capacity. (4) Use the special pen of Business Communication and the fishing light-emitting buoy to investigate the actual effect of the developed battery, which can work continuously for 50h and 20h respectively. u003c/pu003eu003c/pu003e
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