A kind of preparation method of interface modified cathode material for lithium ion battery

Abstract

The invention relates to a method for preparing an interface-modified cathode material for a lithium-ion battery, which solves the problems of poor charging and discharging stability, poor rate performance, and severe cycle capacity attenuation in the existing lithium-ion battery cathode material. The method includes: step 1, preparing positive electrode material; step 2, preparing metal salt solution; step 3, dispersing treatment; step 4, sintering treatment; step 5, electrochemical lithiation treatment; 5.1) making the coating material as an electrode; 5.2) vacuum drying the electrode to obtain the prepared electrode; 5.3) using the prepared electrode as the cathode and the lithium sheet as the anode, the area of ​​the lithium sheet is at least twice the working area of ​​the prepared electrode, and placing the two electrodes in the organic electrolyte; 5.4) Electrochemical treatment is carried out using a two-electrode system; the prepared electrode is charged, and after charging to a certain level, it is left to stand for a period of time, and the active ingredients in the prepared electrode are stripped, washed, and centrifuged, and the separated lower layer material is the interface modified positive electrode Material.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material, in particular to a method for preparing an interface-modified positive electrode material for a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in portable devices such as mobile phones and notebooks due to their advantages such as high voltage, high specific energy of titanium, long cycle life, good safety performance, wide operating temperature range, no memory effect, small self-discharge, and environmental friendliness. , medical equipment, power tools, digital products, etc. In recent years, the application range of lithium-ion batteries has also expanded to some new fields such as new energy transportation (electric vehicles, hybrid vehicles, etc.), smart grids, and new energy (solar, wind) energy storage. The performance of materials puts forward higher requirements. [0003] Lithium-ion batteries mainly include positive elec...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing an interface-modified positive electrode material for a lithium-ion battery. Aiming at the deficiencies in the prior art, an interface-modified layer is provided, which has good ion-conducting properties without affecting the electrode. Discharge voltage platform, so that the positive electrode material can operate stably at the existing voltage, thereby overcoming the problems of poor charge and discharge stability, poor rate performance, and serious cycle capacity decay of the existing lithium-ion battery positive electrode materials

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