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Interpretation of the structure and principle of lithium battery

2019-03-29 09:42:00 0

1. Basic structure of lithium battery


Main materials: positive electrode, negative electrode, electrolyte, diaphragm

Structure: round, square; lamination, winding

Form: polymer (flexible packaging), liquid lithium ion (steel shell)


battery|geb|lithium polymer


2, lithium battery working principle

Cathode material: LiMn2O4, anode material: graphite

Li+ of the positive electrode during charging and Li+ in the electrolytic solution are aggregated to the negative electrode to obtain electrons, which are reduced to a carbon material in which Li is embedded in the negative electrode. Li which is embedded in the negative carbon material during discharge loses electrons and enters the electrolyte, and Li+ in the electrolyte moves toward the positive electrode.


3, lithium battery composition principle

(1) positive electrode structure

LiMn2O4 (lithium manganate) + conductive agent (acetylene black) + binder (PVDF) + current collector (aluminum foil) positive electrode

(2) negative electrode structure

Graphite + conductive agent (acetylene black) + binder (PVDF) + current collector (copper foil) anode

battery|geb|lithium polymer


4, the charging process

The power supply charges the battery. At this time, 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, “crawling” through the curved hole on the diaphragm, “swim "Get to the negative pole and combine with the electronics that have been running long ago."

The reaction occurring on the positive electrode is LiMn2O4==Li1-xMn2O4+Xli++Xe (electron)

The reaction occurring on the negative electrode is 6C+XLi+Xe==LixC6


5, the discharge process

The battery is discharged. At this time, the electron e on the negative electrode runs from the external circuit to the positive electrode, and the positive lithium ion Li+ “jumps” into the electrolyte from the negative electrode, “crawls” through the curved hole on the diaphragm, and “swims” to arrive. The positive pole is combined with the electrons that have long since ran.

The reaction occurring on the positive electrode is Li1-xMn2O4+xli++xe(electron)==LiMn2O4

The reaction occurring on the negative electrode is LixC6==6C+xLi+xe


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