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Modified ternary cathode material and preparation method thereof, lithium ion battery

A cathode material and modification technology, which are applied in the field of lithium ion batteries, modified ternary cathode materials and their preparation, can solve the problems of low discharge specific capacity and poor cycle stability, and achieve good cycle stability and good material rate performance. , the effect of reducing side effects

Active Publication Date: 2019-01-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an improved coating layer containing lithium metaindium oxide with high discharge specific capacity and good cycle performance in order to overcome the problems of poor cycle stability and low discharge specific capacity in the prior art. Non-toxic ternary cathode material

Method used

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  • Modified ternary cathode material and preparation method thereof, lithium ion battery
  • Modified ternary cathode material and preparation method thereof, lithium ion battery
  • Modified ternary cathode material and preparation method thereof, lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The preparation of modified ternary cathode material comprises the following steps:

[0046] (1) Weigh 0.1956g In(NO 3 ) 3 Add 20mL of absolute ethanol to the powder for stirring and mixing, the stirring speed is 100 rpm, and the stirring time is 30min, so that In(NO 3 ) 3 The powder is completely dissolved to form a homogeneous solution;

[0047] (2) Add 10.0000g LiNi to the resulting homogeneous solution 0.8 co 0.1 mn 0.1 o 2 The powder was stirred and mixed, the stirring temperature was 30°C, the stirring speed was 800 rpm, and the stirring time was 1h, so that In(NO 3 ) 3 Uniformly adsorbed on LiNi 0.8 co 0.1 mn 0.1 o 2 s surface;

[0048] (3) Evaporate the product obtained in step (2) to dryness at 60°C and a stirring speed of 100 rpm, and then dry it in a blast drying oven at 120°C for 12 hours to obtain a solid powder;

[0049] (4) The obtained solid powder was calcined at 400°C for 12 hours in an air atmosphere to obtain LiNi coated with lithium me...

Embodiment 2

[0051] The preparation of modified ternary cathode material comprises the following steps:

[0052] (1) Weigh 0.7826g In(NO 3 ) 3 Add 40mL of absolute ethanol to the powder for stirring and mixing, the stirring speed is 800 rpm, and the stirring time is 10min, so that In(NO 3 ) 3 The powder is completely dissolved to form a homogeneous solution;

[0053] (2) Add 10.0000g LiNi to the resulting homogeneous solution 0.8 co 0.1 mn 0.1 o 2 The powder was stirred and mixed, the stirring temperature was 40°C, the stirring speed was 100 rpm, and the stirring time was 20h, so that In(NO 3 ) 3 Uniformly adsorbed on LiNi 0.8 co 0.1 mn 0.1 o 2 s surface;

[0054] (3) Evaporate the product obtained in step (2) to dryness at 80°C and a stirring speed of 500 rpm, and then dry it in a blast drying oven at 90°C for 8 hours to obtain a solid powder;

[0055] (4) The obtained solid powder was calcined at 1000°C for 3 hours in an air atmosphere to obtain LiNi coated with lithium met...

Embodiment 3

[0057] The preparation of modified ternary cathode material comprises the following steps:

[0058] (1) Weigh 1.9565g In(NO 3 ) 3 Add 80mL of absolute ethanol to the powder for stirring and mixing, the stirring speed is 500 rpm, and the stirring time is 30min, so that In(NO 3 ) 3 The powder is completely dissolved to form a homogeneous solution;

[0059] (2) Add 10.0000g LiNi to the resulting homogeneous solution 0.8 co 0.1 mn 0.1 o 2 The powder was stirred and mixed, the stirring temperature was 30 ° C, the stirring speed was 500 rpm, and the stirring time was 10 h, so that In(NO 3 ) 3 Uniformly adsorbed on LiNi 0.8 co 0.1 mn 0.1 o 2 s surface;

[0060](3) Evaporate the product obtained in step (2) to dryness at 70°C and a stirring speed of 800 rpm, and then dry it in a blast drying oven at 100°C for 20 hours to obtain a solid powder;

[0061] (4) The obtained solid powder was calcined at 600°C for 6 hours in an air atmosphere to obtain a 10% mass fraction of li...

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Abstract

A modified ternary cathode material and a preparation method thereof; a lithium ion battery is provided, wherein the general formula of the modified ternary cathode material is LiNixCoyM1- X- YO2 @ aLiInO2, where 0.8 <= x < 1, 0 < y < 1, 0 < 1- X- Y< 1, M is Mn and / or Al element, a is the content of lithium meta indium oxide coating layer, based on the total weight of the modified ternary cathodematerial, 0 <a<=10% by weight. The invention also includes a preparation method of a modified ternary cathode material and a lithium ion battery. The modified ternary cathode material of the inventionhas good cycle stability and magnification performance, and the preparation method is simple in operation, low in cost and safe and reliable. On this basis, the discharge capacity and cycle performance of the lithium ion battery using the modified ternary cathode material as the cathode material are significantly improved, and the lithium ion battery can be used in the field of power battery.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a modified ternary positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of long cycle life, no memory effect, environmental friendliness, and low self-discharge rate, and have broad application prospects. With the promotion of new energy vehicles, power lithium-ion batteries have been greatly developed. Therefore, further research and development of lithium-ion battery materials with high energy density and high power density has become a hot topic in the fields of chemistry, materials, physics and energy in the world today. [0003] In order to realize the concept of high energy density and high power density of lithium-ion batteries, it is necessary to be cautious in finding suitable positive electrodes, negative electrodes and electrolytes. In recent years, the pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 郑俊超刘洋范鑫铭贺振江汤林波
Owner CENT SOUTH UNIV
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