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Gradient-doped high-energy-density type lithium cobalt oxide positive electrode material and preparation method thereof

A high energy density, gradient doping technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as poor electrochemical performance, eliminate structural mutations, improve electrochemical performance, and increase doping elements effect of concentration

Active Publication Date: 2018-05-08
GEM JIANGSU COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a gradient doped high energy density lithium cobalt oxide positive electrode material and its preparation method, aiming to solve the technical problem of poor electrochemical performance of existing lithium cobalt oxide positive electrode materials

Method used

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  • Gradient-doped high-energy-density type lithium cobalt oxide positive electrode material and preparation method thereof
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preparation example Construction

[0025] The preparation method of the highly doped high energy density lithium cobalt oxide cathode material provided by the present invention comprises the following steps:

[0026] (1) Weigh the Co salt, Al salt, and Mg salt according to the ratio of Co: Al: Mg mass ratio (99.5-99.9): (0-0.3): (0-0.2), and dissolve them in deionized water, Salt solution A 1 .

[0027] The Co salt is SO 4 , Al salt is Al 2 (SO 4 ) 3 , Mg salt is MgSO 4 , configured into a salt solution A 1 The concentration of metal ions in the medium is 1mol / L.

[0028] (2) Concentration NaOH solution is configured; ammonia solution C is configured according to the ratio of metal ion:ammonia substance ratio of 1:(0.1~1) 1 .

[0029] Described NaOH solution concentration is 2mol / L, ammonia solution C 1 The concentration is 1mol / L;

[0030] (3) Add a certain amount of deionized water and ammonia water in the reactor to configure ammonia solution C 2 .

[0031] The ammonia solution C 2 The concentr...

Embodiment 1

[0044] CoSO 4 、Al 2 (SO 4 ) 3 , MgSO 4 Weigh according to the ratio of Co:Al:Mg mass ratio of 99.8:0.1:0.1, dissolve in deionized water, and make salt solution A with metal ion concentration of 1mol / L 1 ; Configure a NaOH alkali solution with a concentration of 2 mol / L; configure a 1 mol / L ammonia solution according to the ratio of the metal ion:ammonia substance molar ratio of 1:0.1. Add a certain amount of deionized water and ammonia water into the reaction kettle, and make a 0.5mol / L ammonia solution as the bottom liquid. Then the saline solution A 1 , NaOH solution and ammonia solution were added to the reaction kettle at a certain flow rate at the same time, and the co-precipitation reaction was carried out for 12 hours. During this process, the stirring rate, pH and temperature in the reaction kettle were controlled to be 500rad / min, 11.5, and 50°C respectively; After aging for 12 hours, the precipitate was washed several times until the washing liquid was neutral,...

Embodiment 2

[0049] CoSO 4 、Al 2 (SO 4 ) 3 , MgSO 4 Weigh according to the ratio of Co:Al:Mg mass ratio of 99.7:0.2:0.1, dissolve in deionized water, and make salt solution A with metal ion concentration of 1mol / L 1 ; Configure a NaOH alkali solution with a concentration of 2 mol / L; configure a 1 mol / L ammonia solution according to the ratio of the metal ion:ammonia substance molar ratio of 1:0.1. Add a certain amount of deionized water and ammonia water into the reaction kettle, and make a 0.5mol / L ammonia solution as the bottom liquid. Then the saline solution A 1 , NaOH solution and ammonia solution were added to the reaction kettle at a certain flow rate at the same time, and the co-precipitation reaction was carried out for 12 hours. During this process, the stirring rate, pH and temperature in the reaction kettle were controlled to be 500rad / min, 11.5, and 50°C respectively; After aging for 12 hours, the precipitate was washed several times until the washing liquid was neutral,...

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Abstract

The invention is applicable to the technical field of a lithium battery, and provides a gradient-doped high-energy-density type lithium cobalt oxide positive electrode material and a preparation method thereof. According to the lithium cobalt oxide material prepared by the method, Al and Mg concentrations in the material inner layer are relatively low while Al and Mg concentrations in the materialouter layer are relatively high, so that gradient doping distribution is formed, thereby eliminating structural sudden change caused by sudden change of the doped element concentrations; meanwhile, the doping element concentration on the surface of the material can be improved, and the material surface structure can be stabilized; in addition, after Al and Mg gradient-doped cobalt oxide X<2> is obtained, Mn, Ti, Zr and Ce doping and primary calcining are performed to obtain primary lithium cobalt oxide particles D1; and next, F and PO<4><3-> doping and secondary calcining are performed to finally obtain the gradient-doped high-energy-density type lithium cobalt oxide positive electrode material. By virtue of the preparation method, the electrochemical performance of the lithium cobalt oxide material in a high charging cut-off voltage can be improved effectively.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a gradient doped high energy density lithium cobalt oxide cathode material and a preparation method thereof. Background technique [0002] At present, the modification methods of lithium cobaltate materials are mainly doping the matrix and coating the surface of the material. Under the lower charging cut-off voltage (4.2-4.35V) in the past, traditional doping and coating methods can effectively improve the electrochemical performance of lithium cobalt oxide materials; however, as the market demands higher and higher energy density for batteries, Lithium cobalt oxide materials have begun to develop towards high voltages. Under high charge cut-off voltages (4.45V-4.6V), traditional doping and coating methods have limited improvement in the electrochemical performance of materials. When the matrix is ​​doped with more elements, it can stabilize the material structure, but...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525Y02E60/10
Inventor 徐世国靳亚珲栗志涛宋健巍丁文秀王星宁
Owner GEM JIANGSU COBALT IND CO LTD
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