High-energy density 18650 electrical core and production method thereof

Abstract

The invention relates to the field of a battery, and discloses a high-energy density 18650 electrical core. The 18650 electrical core comprises a housing, a positive plate, a negative plate, a diaphragm and an electrolyte. a current collector of the positive plate is aluminum foil, a positive active substance is nickel cobalt lithium manganate 811; the current collector of the negative plate is copper foil, a negative active substance is a silicon-based composite material; the diaphragm is a PP or PE material; a solute of the electrolyte is lithium hexafluorophosphate and lithium bisoxalatoborate, and the solvent of the electrolyte is a mixture of one of succinic anhydride and fluoroethylene carbonate as well as vinylene carbonate. The 18650 electrical core selects the specific positive and negative materials for cooperation, has high-energy density, overcomes many technical defects during a preparation process, and practically realizes batch production.

Description

technical field [0001] The invention relates to the field of batteries, in particular to an 18650 battery cell with high energy density and a preparation method thereof. Background technique [0002] 18650 is the originator of lithium-ion batteries, a standard lithium-ion battery model set by Japan's SONY company in order to save costs, where 18 means a diameter of 18mm, 65 means a length of 65mm, and 0 means a cylindrical battery. Common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. The voltage of lithium ion battery is 3.6V and 4.2V, the voltage of lithium iron phosphate battery is 3.2V, the capacity is usually 1200mAh-3000mAh, and the common capacity is 2200mAh-3600mAh. [0003] Now with the vigorous development of pure electric vehicles, the existing materials and systems of 18650 batteries can no longer meet the energy density requirements of electric vehicles. In order to improve the cruising range of electric vehicles, t...

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Problems solved by technology

[0003] Now with the vigorous development of pure electric vehicles, the existing materials and systems of 18650 batteries can no longer meet the energy density requirements of electric vehicles. In order to improve the cruising range of electric vehicles, the energy density of the battery itself must be increased. Therefore There is an urgent need to develop a 18650 battery suitable for electric vehicle power batteries