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Coated and modified anode material and preparation method thereof

A positive electrode material and modification technology, applied in the direction of positive electrode, active material electrode, battery electrode, etc., can solve the problems of structural damage of positive electrode material, safety accident, easy reaction between positive electrode material and electrolyte, etc., to achieve high specific capacity, The effect of stable structure and excellent fast charging performance

Active Publication Date: 2015-07-29
北京盟固利新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the condition of high charging voltage, on the one hand, the positive electrode material and the electrolyte are prone to react, causing safety accidents; on the other hand, the structure of the positive electrode material itself will be destroyed.

Method used

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  • Coated and modified anode material and preparation method thereof
  • Coated and modified anode material and preparation method thereof
  • Coated and modified anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0049] Step 1. Preparation of matrix

[0050] In the above step 1, the matrix is ​​represented by the following formula I:

[0051] LiCo 1-x m x o 2

[0052] Formula Ⅰ

[0053] In the above formula I, the M is one or more of Mg, Al, Mn, Ni, Ca, Zr, Cr, Ti, Cu, Zn, Y, Ce, Mo, Nb, V, P and F .

[0054] In the above formula I, the value range of x is as follows: 0≤x≤0.3.

[0055] In the above step 1, the preparation method of the matrix is ​​not particularly limited, and can be selected according to actual needs and actual conditions.

[0056] In a preferred embodiment, the matrix is ​​prepared by a method comprising the following two steps:

[0057] Step (1), mixing the lithium source, the cobalt source and the M-containing compound, and then sintering the mixed material at 500-1100° C. for 3-20 hours.

[0058] In the above step (1), the lithium source is one or more of lithium carbonate, lithium hydroxide, lithium nitrate and lithium acetate.

[0059] In the above ste...

Embodiment 1

[0113] 1. Preparation of matrix

[0114] (1) 75.369g Li 2 CO 3 , 160.53g Co 3 o 4 and 1.509g NiO 2 Ball milling and mixing, after mixing evenly, sinter the mixed material at 1000°C for 12 hours;

[0115] (2) After the sintered mixed material is crushed and passed through a 300-mesh sieve, the matrix LiCo 0.99 Ni 0.01 o 2 .

[0116] 2. Preparation of coated and modified positive electrode materials

[0117] (1) 0.75g tin antimony oxide (mass ratio SnO 2 :Sb 2 o 3 =90:10, D50=10nm) was added into 100mL deionized water to form A solution;

[0118] (2) LiCo prepared in 150g step 1 0.99 Ni 0.01 o 2 After adding to liquid A, stir and disperse evenly, then dry in an oven at 160°C, pass through a 200-mesh sieve, and sinter at 350°C for 4 hours to obtain a coated and modified positive electrode material.

Embodiment 2

[0120] 1. Preparation of matrix

[0121] (1) 49.333g LiOH, 237.884g CoCO 3 and 4.7g Cr 2 o 3 Ball milling and mixing, after mixing evenly, sinter the mixed material at 1000°C for 12 hours;

[0122] (2) After the sintered mixed material is crushed and passed through a 200-mesh sieve, the matrix LiCo 0.97 Cr 0.03 o 2 .

[0123] 2. Preparation of coated and modified positive electrode materials

[0124] (1) 0.75g indium tin oxide (mass ratio In 2 o 3 :SnO 2 =90:10, D50=20nm) was added into 100mL deionized water to form A solution;

[0125] (2) LiCo prepared in 150g step 1 0.97 Cr 0.03 o 2 After adding to liquid A, stir and disperse evenly, then dry in an oven at 120° C., pass through a 200-mesh sieve, and sinter at 350° C. for 4 hours to obtain a coated and modified positive electrode material.

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Abstract

The invention discloses a coated and modified anode material which comprises a matrix and a coating layer, wherein the matrix is shown as LiCo(1-x)MxO2, the value range of x is more than or equal to 0 and less than or equal to 0.3, and M is one or more of Mg, Al, Mn, Ni. Ca, Zr, Cr, Ti, Cu, Zn, Y, Ce, Mo, Nb, V, P and F; the coating layer is one or more of metal oxides. The coated and modified anode material has the advantages of stable structure, good safety, high specific capacity and low cost.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular relates to lithium ion battery positive electrode materials, in particular, relates to a coating modified positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of secondary battery, which mainly relies on the movement of lithium ions between the positive and negative electrodes to work. [0003] Lithium-ion batteries have the advantages of high specific capacity, high voltage and good safety, and are widely used in portable electronic products. With the increasing market demand for lithium-ion battery cathode materials, the requirements for electrochemical capacity, fast charging performance, cycle performance and safety performance of cathode materials are also getting higher and higher. [0004] At present, the most commonly used cathode material for lithium-ion batteries is layered LiCoO 2 , and its res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/131H01M4/1391
CPCH01M4/131H01M4/1391H01M4/366H01M4/525H01M4/62H01M10/0525H01M2004/028Y02E60/10
Inventor 高利亭江卫军白珍辉魏卫苏迎春张溪王晓浦崔妍庞自钊朱晓沛
Owner 北京盟固利新材料科技有限公司
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