li ion 18650 battery pack.Talk about the effect of gelling agent content on the discharge performance of alkaline batteries

　　Glue refers to a latex-thick liquid or semi-solid preparation in the form of a homogeneous, suspension or emulsion made of drugs and appropriate excipients. Add a certain amount of gel agent to the negative electrode zinc paste of the alkaline zinc-manganese battery to make the zinc powder and electrolyte in the zinc paste form a stable and evenly dispersed paste, ensuring that there is sufficient electrolyte on the surface of the zinc powder particles during battery discharge. Covering and preventing uneven settlement of zinc powder and electrolyte.

　　In addition, the gel agent can also promote the contact between zinc powders and between zinc powders and current collectors, thereby improving the occurrence of abnormal voltage drops when the battery is subjected to vibration and during use. While the gel agent has many of the above advantages, it also hinders the free movement of ions in the electrolyte and reduces the mass transfer performance of the zinc paste electrode.

　　Zinc pastes with different gelant contents were made into alkaline batteries, and 5mA and 10mA discharge tests were performed on them using battery discharge detection equipment at room temperature, and the discharge end voltage was set to 1V. As a result, we found that adding too much or too little gelling agent will prevent the battery from achieving optimal discharge performance. If the amount of gel agent added is too small, although the discharge voltage of the battery is relatively high in the early and middle stages of discharge, the voltage begins to drop suddenly in the middle and late stages, resulting in a short discharge time. If too much gelling agent is added, the constant current discharge voltage of the battery is low. This is caused by poor diffusion of reactants or products or uneven contact between zinc powder particles. When the gelling agent content is 80 mg, the alkaline battery Discharge performance reaches its best.

　　Therefore, during the manufacturing process, battery manufacturers must choose the appropriate amount of gelling agent to ensure the discharge capacity of the battery while maintaining a higher discharge voltage and better high-current discharge performance of alkaline batteries.

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