In recent years, with the improvement of the functions […]
In recent years, with the improvement of the functions of high-tech products such as digital cameras, at the same time, higher requirements have been placed on the performance of alkaline batteries. Among them, the requirements for battery capacity, storage life and heavy-load output performance are the most obvious.
1. Capacity. Capacity improvement is a never-fading topic in the battery industry. Since the specific specifications and shape standards and national standards of alkaline batteries are clearly stipulated, the freedom of changing the shape is relatively small, but if the battery manufacturer can strictly control the size of the steel shell, it is within the IEC standard but close to the upper limit , then it is a good way to achieve high filling of the active material inside the battery by thinning the label paper and thinning the copper needle, so as to achieve the highest increase in the battery capacity.
2. Storage life. Since metallic zinc is in a thermodynamically unstable state in an alkaline K()H system, there is a tendency to react with water or OH to generate nitrogen, so solving the problem of self-corrosion of zinc electrodes is the key to solving the storage life of batteries. With the development trend of mercury-free alkaline batteries, it is imminent to solve the problem of self-corrosion of zinc electrodes.
3. Heavy-duty output performance. To solve the heavy-load output performance, the first thing to consider is to reduce the internal resistance of the battery. The internal resistance of the battery mainly comes from the contact resistance and the internal resistance of the material itself. The contact resistance includes the contact between the positive electrode ring and the steel shell, the contact between the current collector and the negative electrode zinc paste, the contact between the positive and negative electrodes and the diaphragm material, etc. In addition to the resistance of the material itself, the resistance is also related to the positive and negative electrode formulations.
In order to be in an advantageous position in the fierce market competition, it is the key for battery manufacturers to produce alkaline zinc-manganese batteries with high capacity, long life and strong output performance under heavy load.