A kind of preparation method of porous lithium nickelate positive electrode material

Abstract

The invention discloses a preparation method of a porous lithium nickelate cathode material. The method includes: adding an alkali-containing organic template agent into a nickel salt anhydrous ethanol solution, performing heating stirring until the color of the reactants turns from dark green to light green, and then conducting airtight standing at room temperature to obtain a nickel hydroxide sol; subjecting the sol t o dynamic rotation aging to form nickel hydroxide gel, and then performing drying to obtain nickel hydroxide powder; mixing the nickel hydroxide powder with lithium hydroxide powder and grinding the substances uniformly, then adding deionized water for further grinding, conducting drying, and then subjecting the prepared deep green block solid to low temperature plasma treatment, and removing the template agent, thus obtaining the porous lithium nickelate cathode material. The porous lithium nickelate cathode material prepared by the method provided by the invention hasa porous structure, provides more channels for deintercalation of lithium ions, and improves the discharge specific capacity, discharge rate and cycle stability of the prepared material. The preparation method provided by the invention also has the advantages of simple process, mild conditions, good repeatability, facilitation of industrial popularization, etc.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a porous lithium nickelate positive electrode material. Background technique [0002] In recent years, due to the rapid development of the global information industry and the rapid popularization of portable electronic products (such as: notebook computers, digital cameras and digital video cameras, etc.), the requirements for battery performance are also getting higher and higher. Specifically, excellent batteries not only require With the advantages of high capacity, high power, light weight, small size and no pollution, its safety and charge-discharge cycle life must also be high, which greatly stimulates the rapid development and technological progress of the battery industry. [0003] Due to the advantages of high working voltage, high specific energy, long cycle life, small self-discharge coefficient and no memory effect, lithium...

AI Technical Summary

Problems solved by technology

However, the natural resources of cobalt are limited and expensive, coupled with the low capacity (reversible capacity of 110-150mA h / g), this greatly limits the application and performance of lithium-ion batteries using lithium cobaltate as the cathode material. further improvement of

Lithium nickelate is one of the most promising positive electrode materials that is expected to replace lithium cobaltate. Its theoretical capacity is 294mA h / g, its actual capacity can reach 190-210mA h / g, and it has less impact on the environment. In terms of price and resources, it has more advantages than lithium cobaltate. At present, lithium nickelate is mainly faced with the problems of difficult preparation methods and serious capacity fading at high temperature as the positive electrode material of lithium ion batteries.