A kind of preparation method of porous lithium nickelate cathode material doped with magnesium and tin

Abstract

The invention discloses a preparation method of a porous lithium nickelate anode material doped with magnesium and tin. The preparation method comprises the following steps: adding an alkali solution,magnesium salt, tin salt and deionized water in a template agent, uniformly stirring, and slowing dropwise adding in an anhydrous ethanol solution of nickel salt to prepare a nickel hydroxide solution doped with magnesium and tin; ageing the obtained sol to form gel, and drying to prepare powder; and mixing the powder and lithium hydroxide powder, uniformly grinding, adding deionized water, grinding, drying, performing low temperature plasma treatment on the prepared solid, and removing the template agent to prepare the porous lithium nickelate anode material doped with magnesium and tin. Bydoping with Mg<2+> and Sn<4+>, the heat stability of a lithium nickelate structure can be enhanced, and high discharge capacity can be maintained; and the porous structure provides more channels for disembedding lithium ions, and the specific discharge capacity, the discharge rate and the cycling stability of the prepared material are further improved.

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 cathode material doped with magnesium and tin. 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 memo...

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.