Introduction to the working principle and structure of lithium-ion batteries

1. Important materials for the basic structure of lithium-ion batteries: positive electrode, negative electrode, electrolyte, diaphragm structure: round, square; laminated, winding form: polymer (soft packaging), liquid lithium ion (steel shell) 2. lithium ion battery Working principle Positive electrode material: LiMn2O4, negative electrode material: When graphite is charged, Li+ in the positive electrode and Li+ in the electrolyte accumulate to the negative electrode to obtain electrons, which are reduced to Li and embedded in the carbon material of the negative electrode. During discharge, Li embedded in the carbon material of the negative electrode loses electrons and enters the electrolyte, and the Li+ in the electrolyte moves to the positive electrode. 3. Composition principle of lithium ion battery ① Positive structure LiMn2O4 (lithium manganate) + conductive agent (acetylene black) + binder (PVDF) + current collector (aluminum foil) positive electrode ② negative structure graphite + conductive agent (acetylene black) + adhesive The principle and concept of the mixture (PVDF) + current collector (copper foil) negative power lithium battery is so simple! 4. During 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 from the positive electrode into the electrolyte, crawls through the twisty hole in the diaphragm, and swims to reach it. The negative electrode is combined with the electrons that have run over long ago. The reaction on the positive electrode is LiMn2O4u003du003dLi1-xMn2O4+Xli++Xe (electrons) The reaction on the negative electrode is 6C+XLi+Xeu003du003dLixC65. During the discharge process, the battery is discharged, and the electron e on the negative electrode passes through the The circuit ran to the positive pole, and the positive lithium ion Li+ jumped from the negative pole into the electrolyte, crawled through the twisty hole in the diaphragm, swam to the positive pole, and combined with the electrons that had run over long ago. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Detailed explanation of the protection function of lithium iron phosphate battery