The basic working principle of
lithium batteries.
1、 The basic structure of lithium batteries
Main materials: positive electrode, negative electrode, electrolyte, separator
Structure: circular, square; Lamination, winding
Form: Polymer (flexible packaging), liquid lithium-ion (steel shell)
The principle and concept of power batteries are as simple as that!
2、 The working principle of lithium batteries
Positive electrode material: LiMn2O4, negative electrode material: graphite
During charging, Li+in the positive electrode and Li+in the electrolyte aggregate towards the negative electrode, obtaining electrons that are reduced to Li and embedded in the carbon material of the negative electrode. During discharge, Li embedded in the negative carbon material loses electrons and enters the electrolyte, causing Li+in the electrolyte to move towards the positive electrode.
3、 The composition principle of lithium batteries
lithium battery
① Positive electrode structure
LiMn2O4 (lithium manganese oxide)+conductive agent (acetylene black)+binder (PVDF)+current collector (aluminum foil) positive electrode
② Negative structure
Graphite+conductive agent (acetylene black)+binder (PVDF)+collector (copper foil) negative electrode
The principle and concept of power batteries are as simple as that!
4. Charging process
The power source charges the battery. At this point, the electron e on the positive electrode runs from the external circuit to the negative electrode, and the positive lithium ion Li+"jumps" from the positive electrode into the electrolyte, "crawls" through the arc-shaped hole on the separator, "swims", "reaches the negative electrode" and combines with the electrons that have already run.
The reaction that occurs on the positive electrode is LiMn2O4==Li1-xMn2O4+Xli++Xe (electron)
The reaction on the negative electrode is 6C+XLi+Xe==LixC6
5. Discharge process
When the battery is discharged, the electrons e on the negative electrode run from the external circuit to the positive electrode, and the lithium ions Li+on the positive electrode "jump" from the negative electrode into the electrolyte, "climb" through the arc-shaped hole on the separator, and "swim" to the positive electrode to combine with the electrons that have already run.
The reaction that occurs on the positive electrode is Li1-xMn2O4+xli+xe (electron)==LiMn2O4
The reaction on the negative electrode is LixC6==6C+xLi+xe
