Main materials: positive electrode, negative electrode, electrolyte and diaphragm.
Structure: round and square; Lamination and winding
Morphology: polymer (flexible package), liquid lithium ion (steel shell)
2. Working principle of lithium battery
The anode material is LiMn2O4, and the cathode material is graphite.
When charging, Li+ in the positive electrode and Li+ in the electrolyte gather to the negative electrode to obtain electrons, which are reduced to Li and embedded in the carbon material of the negative electrode. When discharging, Li embedded in the negative carbon material loses electrons and enters the electrolyte, and Li+ in the electrolyte moves to the positive electrode.
3. Composition principle of lithium battery
① Positive electrode structure
LiMn2O4 (lithium manganate)+conductive agent (acetylene black)+binder (PVDF)+ current collector (aluminum foil) anode
② Negative electrode structure
Graphite+conductive agent (acetylene black)+binder (PVDF)+ current collector (copper foil) negative electrode
4. Charging process
When the battery is charged, the electron E on the positive electrode runs from the external circuit to the negative electrode, and the positive lithium ion Li+ "jumps" into the electrolyte from the positive electrode, "climbs over" the winding hole in the diaphragm, "swims" to the negative electrode, and combines with the long-distance electrons.
The reaction at the anode 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 electron E from the negative electrode runs to the positive electrode through the external circuit, and the positive lithium ion Li+ "jumps" into the electrolyte from the negative electrode, "climbs over" the winding hole in the diaphragm, "swims" to the positive electrode, and combines with the long-running electrons.
The reaction at the anode is Li1-xMn2O4+xli++xe (electron) ==LiMn2O4.
The reaction at the negative electrode is LixC6 == 6C+xLi+xe.
