Method for preparing ternary cathode material through combination of pre-sintering and impregnating and lithium battery

A positive electrode material and joint preparation technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as poor cycle stability, and achieve the effects of low cost, high bulk density, and simple operation

Active Publication Date: 2019-10-01
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention provides a method for the preparation of ternary positive electrode materials in combination with pre-calcination and impregnation, the purpose of which is to solve the problem of poor cycle stability caused by microcracks generated by volume effects in lithium-ion batteries during cycling , while improving the rate capability of the material

Method used

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  • Method for preparing ternary cathode material through combination of pre-sintering and impregnating and lithium battery
  • Method for preparing ternary cathode material through combination of pre-sintering and impregnating and lithium battery
  • Method for preparing ternary cathode material through combination of pre-sintering and impregnating and lithium battery

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Embodiment 1

[0037] The invention provides a method for preparing a ternary positive electrode material in combination with pre-sintering and impregnation, comprising the steps of:

[0038] S1. Weigh 10.00g of the ternary precursor, put it into a tube furnace, and pre-fire it in an air atmosphere at 750°C for 4 hours to obtain an oxide powder with a porous structure. The molecular formula of the ternary precursor is Ni 0.8 co 0.1 mn 0.1 (OH) 2 ;

[0039] S2. Weigh a certain amount of LiOH and dissolve it in 20ml of pure water. The molar ratio of the transition metal and lithium in the ternary precursor is 1:1.05, stir until LiOH is completely dissolved, and configure 2.5mol / L LiOH solution;

[0040] S3. Add the oxide powder of the porous structure obtained in S1 into the LiOH solution in S2, stir at 90°C for 10 hours by stirring and impregnating, and then evaporate to dryness at 90°C to obtain a solid powder;

[0041] S4, the powder solid obtained in S4 is pre-fired at 450°C for 6h in...

Embodiment 2

[0050] The present invention provides another method for preparing a ternary positive electrode material in combination with pre-sintering and impregnation, comprising the steps of:

[0051] S1. Weigh 10.00g of ternary precursor solid powder, put it into a tube furnace, and pre-fire it in an air atmosphere at 650°C for 4 hours to obtain an oxide powder with a porous structure;

[0052] S2. Weigh a certain amount of LiOH and dissolve it in 20ml of pure water, stir until LiOH is completely dissolved, and configure it into a 2.5mol / L LiOH solution, wherein the molar ratio of the transition metal to lithium in the ternary precursor is 1 : 1.05;

[0053] S3. Add the oxide powder obtained in S1 to the solution in S2, stir at 90°C for 10 hours by stirring and impregnating, and then evaporate to dryness in a water bath at 90°C to obtain a solid powder;

[0054] S5. Pre-calcining the solid powder at a temperature of 450°C for 6 hours in a pure oxygen atmosphere at a heating rate of 5°...

Embodiment 3

[0062] The present invention provides another method for preparing a ternary positive electrode material in combination with pre-sintering and impregnation, comprising the steps of:

[0063] S1. Weigh 10.00g of the ternary precursor, put it into a tube furnace, and pre-fire it in an air atmosphere at 250°C for 15 hours to obtain an oxide powder with a porous structure. The molecular formula of the ternary precursor is Ni 0.8 co 0.1 mn 0.1 (OH) 2 ;

[0064] S2. Weigh a certain amount of LiOH and dissolve it in 20ml of pure water. The molar ratio of the transition metal and lithium in the ternary precursor is 1:1.05, stir until LiOH is completely dissolved, and configure 2.5mol / L LiOH solution;

[0065] S3. Add the oxide powder of the porous structure obtained in S1 into the LiOH solution in S2, stir at 200° C. for 1 h by stirring and impregnating, and then evaporate to dryness at 200° C. to obtain a solid powder;

[0066] S4, the powder solid obtained in S4 is pre-fired at...

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Abstract

The method provides a method for preparing a ternary cathode material through combination of pre-sintering and impregnating and a lithium battery. The method comprises the following steps that S1, a ternary precursor is pre-sintered at 250-900 DEG C to obtain oxide powder of a porous structure, wherein the pre-sintering heat preservation time is 0.1-15 hours, and the pre-sintering atmosphere is oxygen-containing gas with the oxygen content of 20-100%; S2, a lithium source is completely dissolved in a solvent; S3, the oxide powder in S1 is added into the solution obtained in S2 to be uniformlydispersed, and after full impregnation, the solvent is dried by distillation to obtain a powder product, wherein the impregnation temperature is 0-200 DEG C, and the impregnation time is 1-24 hours; S4, the powder product in S3 is sintered to obtain the ternary cathode material. The method solves the problem that existing adopted solid-phase mixed lithium-high temperature sintering difficultly ensures uniform mixing of the lithium source and the precursor, and the molten lithium source can cover the surfaces of secondary particles of the precursor, thereby hindering the further reaction in terms of mass transfer.

Description

technical field [0001] The invention relates to the field of positive electrode materials of lithium ion batteries, in particular to a preparation method of a ternary positive electrode material and a lithium battery. Background technique [0002] Lithium-ion battery, as a green secondary battery, has the advantages of high energy density, long cycle life, environmental friendliness, and no memory effect, making it widely used in consumer devices, electric vehicles and other fields. The development of positive electrode materials with high capacity, long cycle, and high safety has become a trend for the further development of lithium-ion batteries. [0003] Using LiCoO 2 , LiNiO 2 , LiMnO 2 The structure of the three is similar and the advantages are complementary. The ternary cathode material LiNi 1-x- y co x mn y o 2 It emerged as the times require, which has caused researchers to study extensively on ternary cathode materials. However, there are some disadvantage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2002/72C01P2004/03C01P2006/40H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王志兴曾玥熙郭华军李新海王接喜颜果春胡启阳彭文杰张晓明
Owner CENT SOUTH UNIV
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