Structure of Lithium ion Battery

- Aug 04, 2018 -

Structure of Lithium ion Battery


The main structures of lithium ion batteries include positive and negative electrodes, electrolyte, separator and other accessories. The cathode material is the focus of the research. Three lithium and lithium iron phosphate all describe the cathode materials for lithium ion batteries. The current application of the anode material is mainly graphite, high crystallinity, good conductivity, the capacity of the lithium ion is large, 372mAh/g, greatly exceeded the capacity of the cathode material, which is why the main reason for the current research of the cathode material.


The electrolyte of lithium battery is different from the traditional battery (lead-acid battery, nickel cadmium battery, etc.) and does not use the electrolyte with water as solvent, because the theoretical decomposition voltage of water is only 1.23V (think of the ideal voltage of the single battery for the last phase of the fuel cell), so the battery voltage with water as the electrolyte is up to about 2V. And the voltage of the lithium battery is about 3-4V. The commonly used electrolyte materials are inorganic anionic lithium salts, LiBF4, LiPF6 and LiAsF6 three kinds. Solvents include esters, ethers and SA.


The diaphragm is used to separate the electrons and through the ion, so that the electrons must be moved from the external circuit, while the ion can move through the electrolyte to ensure that the external circuit has current through the circuit to prevent the short circuit from the battery. The diaphragm material has single layer PE, single layer PP, three layer PP and so on.