Method for producing anode active material containing lithium, magnesium compound oxide

A technology of composite oxides and active materials, which is applied in the field of preparation of positive multi-component active materials, can solve the problems of low capacity of lithium manganese oxide positive electrode materials, complex synthesis process, and limited application range, so as to improve electrochemical performance and synthesis process. Simple and shortened heat treatment time

Inactive Publication Date: 2006-03-01
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of the above-mentioned prior art are: not only the synthesis process is complicated, but also the capacity of the lithium manganese oxides prepared by these methods as the positive el

Method used

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  • Method for producing anode active material containing lithium, magnesium compound oxide
  • Method for producing anode active material containing lithium, magnesium compound oxide
  • Method for producing anode active material containing lithium, magnesium compound oxide

Examples

Experimental program
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Embodiment 1

[0037] Under normal temperature and pressure, a 0.1M mixed solution of nickel acetate, cobalt acetate and manganese nitrate was prepared stoichiometrically, and was added dropwise to a lithium hydroxide solution with a concentration of 2mol / l at a flow rate of 0.3ml / min to react and control The pH value of the reaction is at 8, and the precipitate obtained by the reaction is filtered out, and washed repeatedly with deionized water until the pH value reaches neutrality, and then the precipitate is vacuum-dried to obtain a coprecipitate M(OH) 2 , where M includes Ni, Co and Mn; the prepared coprecipitate M(OH) 2 According to M(OH) 2 : Lithium carbonate=1: 1 mol ratio adds lithium carbonate and carries out ball milling and mixes, and makes the mixed powder that contains Li and M; The mixed powder technique that contains Li and M that is made is compressed under the hydraulic press of 50MPa pressure, then Place the pressed tablet in a muffle furnace for pre-calcination at 480°C f...

Embodiment 2

[0039] Under normal temperature and pressure, prepare 0.5M mixed solution of soluble nickel nitrate, cobalt nitrate and manganese acetate according to stoichiometry, and add it dropwise at a flow rate of 0.3ml / min to a lithium hydroxide solution with a concentration of 2mol / l for reaction. Control the pH value of the reaction at 10, filter the precipitate obtained from the reaction, and use deionized water to wash repeatedly until the pH value reaches neutrality, and then vacuum dry the precipitate to obtain a coprecipitate M(OH) 2 , where M includes Ni, Co and Mn; the prepared coprecipitate M(OH) 2 According to M(OH) 2 : The mol ratio of Lithium Hydroxide=1:1 adds Lithium Hydroxide and carries out ball milling mixing, makes the mixed powder that contains Li and M; The mixed powder that makes Li and M is compressed under the hydraulic press of 50MPa pressure, Then place the pressed tablet in a muffle furnace for pre-calcination at 480°C for 3 hours; cool the pre-calcined prod...

Embodiment 3

[0041] Except that the prepared pellets were baked in a muffle furnace at 800°C for 6 hours, the others were the same as in Example 2, and the obtained LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The scanning electron microscope image is shown in image 3 .

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Abstract

A method for preparing positive electrode multielement active material containing lithium / manganese composite oxide includes directly using lithium hydroxide coprecipitation to prepare M ( OH )2 , mixing it with lithium salt in grinding , forming plate by pressing , prebaking , cooled ball grinding , forming plate by pressing and backing . In the method , applied nickel salt is nickel acetate or nickel nitrate , applied cobalt salt is cobalt acetate or cobalt nitrate, applied manganese salt is manganese nitrate or manganese acetate and applied lithium salt is lithium carbonate or lithium acetate .

Description

technical field [0001] The technical solution of the present invention relates to an electrode that selects lithium manganese oxide as one of the active materials, specifically a method for preparing a positive multi-element active material containing lithium manganese composite oxide in a lithium ion battery. Background technique [0002] Batteries are an indispensable energy component for many portable devices. Lithium-ion batteries have higher energy density and cycle performance than other rechargeable batteries. Due to the rapid development of electronic products, electric vehicles and various battery-powered products, the demand for lithium-ion batteries has increased. Commercial lithium-ion batteries are mainly based on layered LiCoO 2 It is a positive electrode material, but cobalt resources are scarce, toxic, polluting the environment and expensive, which limits the further development of lithium-ion batteries, forcing people to devote themselves to the developmen...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/48H01M4/58C01D15/00C01G45/00
CPCY02E60/10
Inventor 韩恩山朱令之李鹏张会情阮艳莉常亮张西慧
Owner HEBEI UNIV OF TECH
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