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Method for preparing hollow nickle-manganese composite oxide balls

A composite oxide, hollow sphere technology, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve problems such as reducing the cycle performance of materials, and achieve the effect of maintaining monodispersity and improving electrochemical performance.

Active Publication Date: 2014-09-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Co-precipitation preparation technology has become a very important method for this material, but in the process of preparing spinel from the product obtained by using carbonate as a coprecipitant, it is inevitable that the manganese in the material will completely become tetravalent, and a large amount of trivalent manganese The existence of the material will significantly reduce the cycle performance of the material

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  • Method for preparing hollow nickle-manganese composite oxide balls
  • Method for preparing hollow nickle-manganese composite oxide balls
  • Method for preparing hollow nickle-manganese composite oxide balls

Examples

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Embodiment 1

[0030] In this embodiment, the nickel salt is nickel sulfate, the manganese salt is manganese sulfate, the carbonate is sodium carbonate, the oxidant is potassium permanganate, and the lithium source is lithium acetate.

[0031] 1. Weigh 13.14g nickel sulfate and 15.21g manganese sulfate, add to deionized water to make 400mL metal ion mixed solution, weigh 19.29g sodium carbonate into 400mL aqueous solution, use a peristaltic pump to control the feeding rate to 2mL / min, adding the metal ion mixed solution to the carbonate mixed solution. After the addition is complete, age for 10-20h, filter the precipitate and wash with deionized water. Set aside after vacuum drying.

[0032] 2. Weigh 0.237g of potassium permanganate and dissolve it in 30mL of deionized water, add 0.4075g of the dried precipitate, uniformly disperse it and transfer it to a hydrothermal reactor with a teflon liner, heat it to 160°C and keep it warm for 14h . After centrifugal cleaning and drying, the target pro...

Embodiment 2

[0038] In this embodiment, the nickel salt is nickel sulfate, the manganese salt is manganese sulfate, the carbonate is sodium carbonate, the oxidant is potassium persulfate, and the lithium source is lithium carbonate.

[0039] 1. Weigh 6.57g nickel sulfate and 12.675g manganese sulfate, add deionized water to make 300mL aqueous solution, weigh 12.72g sodium carbonate into 300mL aqueous solution, use a peristaltic pump to control the feeding rate to 2mL / min, and remove the metal ions. The mixed solution is added to the mixed solution of carbonate. After the addition is complete, age for 10-20h, filter the precipitate and wash with deionized water, vacuum dry for later use

[0040] 2. Weigh 0.5134g potassium persulfate and dissolve it in 30mL deionized water, add 0.3480g of dried precipitate, uniformly disperse it and transfer it to a hydrothermal reactor with teflon liner, heat it to 120°C and keep it for 6h. After centrifugal cleaning and drying, the target product is obtained. ...

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Abstract

The invention discloses a method for preparing hollow nickle-manganese composite oxide balls. The method comprises the following steps: adding water into nickle salt and manganese salt to prepare a metal-ion mixed solution, preparing carbonate into a carbonate solution, and adding the metal-ion mixed solution into the carbonate mixed solution to form a coprecipitation precursor; uniformly dispersing the prepared coprecipitation precursor and a solution containing an oxidizing agent, and performing hydrothermal reaction to prepare a product; and uniformly mixing the obtained product and a lithium source according to a molar ratio of 1:(1-1.1), and calcining for 8-24 hours at the temperature of 500-900 DEG C. The method disclosed by the invention has the advantages that the in-situ oxidation-reduction reaction is adopted and the coprecipitated carbonate can be oxidized in situ to form a precursor of nickle-manganese spinel material, so that the condition of increase of trivalent manganese caused by the incomplete oxidation of Mn in the conversion process from pure carbonate to nickle-manganese spinel is avoided; due to the Kirkendal effect in the chemical reaction, the hollow structure is formed, so that the electro-chemical performance of the material is enhanced.

Description

Technical field [0001] The invention belongs to the field of raw materials and negative electrodes for lithium ion battery cathode materials, and specifically relates to a method for preparing nickel-manganese composite oxide hollow balls. Background technique [0002] Transition metal oxides have been the focus of scientists, especially lithium battery scientists, for many years. The existing mature system cathode materials such as: layered structure of lithium cobalt oxide, spinel structure of lithium manganese oxide and lithium nickel manganate, and olivine structure of lithium iron phosphate materials. The central elements correspond to transition elements. Of cobalt, manganese, nickel, iron, etc. As an important type of negative electrode material for lithium-ion batteries, transition metal oxides, such as CoO, Co3O4, Fe2O3, and CuO, all use transition metal oxides to change their valence to make them have reversible capacity. So in this sense, it is the transition metal t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王强饶媛媛曾晖王康平
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY