Lithium manganese dioxide battery is a type of battery with lithium as the negative electrode and manganese dioxide as the positive electrode. Manganese dioxide battery has good performance of low and medium rate discharge, cheap price, good safety performance and competitive with conventional battery, so it is the first commercialized kind of lithium battery.
The following is a fully sealed cylindrical winding lithium manganese dioxide battery as an example to explain the basic manufacturing process of this type of battery, its manufacturing process.
1. Lithium manganese dioxide battery manganese dioxide cathode preparation
Heat-treated electrolytic manganese dioxide powder and acetylene black, polytetrafluoroethylene emulsion, isopropyl alcohol mixed in a certain proportion and stirred into a paste, and then the paste is evenly coated in the metal collector network for heat treatment and lapping made of electrodes; there is a method to prepare a good positive paste is heated and placed on both sides of the metal collector by roller machine rolling and made of electrodes. The prepared electrode should be placed in the environment of air humidity less than 2010.
2. The preparation of lithium metal lithium negative electrode of lithium manganese dioxide battery
According to different battery models, choose the corresponding thickness and width of lithium tape, and cut it into the required length, and then cold welding the lug on the cut lithium tape. Negative electrode preparation must be carried out in an environment with a relative humidity of less than 2%.
3. The preparation of lithium manganese dioxide battery diaphragm
Will meet the thickness and width requirements of polypropylene diaphragm dried and placed in an environment of less than 2% humidity. Usually choose the composite diaphragm can be closed at 130 ~ 160 ℃.
4. The preparation of lithium manganese dioxide battery core
In an environment of less than 2% humidity, two layers of diaphragms slightly wider than the electrode are wrapped around both sides of the positive manganese dioxide electrode to separate the positive electrode from the negative lithium electrode, and then in the winding machine will be wound into a core body and put into the battery case. Lithium manganese dioxide cell core winding structure.
5. Lithium manganese dioxide battery electrolyte solution preparation
Electrolyte solution formula varies from manufacturer to manufacturer, the basic preparation method is to mix the lithium perchlorate with the purified propylene carbonate, ethylene glycol dimethyl ether, etc. in proportion to the water. The preparation of electrolyte solution requires a dry air environment with humidity less than 2%.
6. Lithium manganese dioxide battery electrolyte solution filling and liquid injection port sealing welding
The upper cover with glass insulator will be welded with the shell of installed electrode core first, and then the electrolyte solution of specified weight will be injected into the battery from the injection hole by liquid injection machine, and the hole will be plugged and welded by steel ball.