Views: 240 Author: Site Editor Publish Time: 2023-12-08 Origin: Site
A Li-Mn battery is a lithium dioxide manganese battery in general. It is a type of battery in which the negative electrode is lithium and the positive electrode is manganese dioxide.
The lithium dioxide manganese battery has good low and medium rate discharge performance, a low price, and good safety performance. Because it is competitive with traditional batteries, it was the first type of lithium battery to be commercialised.
Using a fully sealed cylindrical winding Li-Mn battery as an example, this article discusses the basic manufacturing process as well as the production flow for this type of battery.
To make a paste, combine heat-treated electrolytic manganese dioxide powder, acetylene black, polytetrafluoroethylene emulsion, and isopropyl alcohol in a certain proportion. The paste is then evenly applied over a metal collector grid before being heat treated and rolled to produce an electrode. Another way is to heat the prepared positive electrode paste and roll it through a rolling machine on both sides of the metal collector to produce an electrode. The prepared electrode should be stored in an environment with less than 2% humidity.
Choose lithium strips with the proper thickness and width for the Li Mno2 cell model and cut them to the needed length. The electrode tabs are then cold welded onto the lithium strips that have been cut. The negative electrode must be prepared in an atmosphere with a relative humidity of less than 2%.
Dry and store a polypropylene separator of the specified thickness and width in an environment with less than 2% humidity. Typically, a composite separator that can be closed at 130-160°C is chosen.
Wrap two layers of separators on both sides of the manganese dioxide positive electrode in an atmosphere with less than 2% humidity to isolate the positive electrode from the lithium negative electrode. Then, using a winder, wind it into a core and place it in the battery case. The graphic depicts the winding structure of the Li-Mn battery core.
Different lithium manganese dioxide battery providers use different electrolyte solution formulations. Dehydrated lithium perchlorate is mixed in a proportion with purified propylene carbonate, ethylene glycol dimethyl ether, and other components. The electrolyte solution should be prepared in a dry air environment with less than 2% humidity.
Weld the upper cover with glass insulators to the shell with the electrode core inserted first, and then use an injection machine to inject the necessary amount of electrolyte solution into the battery through the injection hole. Finally, solder the hole shut with a steel ball.
What Are the Differences Between Primary and Secondary Lithium Batteries?
To begin, we must distinguish between two sorts of batteries. A lithium primary battery is one that can generate electricity when it is created but cannot be reused. Secondary lithium batteries must be charged before use, and they can be charged and discharged several times.
Secondary lithium batteries are classified into four categories based on the materials used in the positive and negative electrodes of the battery core: lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and lithium-ion batteries.
1. Reversible changes occur between the electrode volume and structure during the discharge of secondary lithium batteries, whereas the internal structure of lithium primary batteries is considerably simpler because it does not require the regulation of these reversible changes.
2. Lithium primary batteries have a larger mass-specific capacity and volumetric-specific capacity than regular rechargeable batteries, but their internal resistance is substantially higher than that of secondary lithium batteries, resulting in a lower load capacity.
3. Lithium primary batteries have substantially lower self-discharge than secondary lithium batteries. Lithium primary batteries, like alkaline and carbon batteries, can only be discharged once. Secondary lithium batteries can be reused.
4. Secondary lithium batteries are less harmful to the environment than main lithium batteries. After use, lithium primary batteries must be thrown, however rechargeable batteries can be used repeatedly. Secondary-generation rechargeable batteries that meet national requirements can typically be used more than 1,000 times, implying that the waste generated by rechargeable batteries is less than a thousandth of that generated by lithium primary batteries. Secondary lithium batteries offer substantial benefits in terms of waste reduction, resource utilisation, and economics.
5. Lithium primary batteries have significantly higher internal resistance than secondary lithium batteries, and their high current discharge performance is likewise poorer.
6. The mass-specific capacity of lithium primary batteries is greater than that of standard secondary lithium batteries under conditions of low current and intermittent discharge. When the discharge current exceeds 800mAh, however, the capacity advantage of lithium primary batteries is considerably reduced.
Disposable lithium batteries, also known as primary lithium batteries, include lithium sub-batteries, lithium manganese batteries, lithium sulphur batteries, lithium iron batteries, and other non-rechargeable primary batteries.