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A method for preparing ternary high-nickel positive electrode material by sol-gel self-propagating combustion method

A technology of self-propagating combustion and positive electrode materials, applied in the direction of electrical components, battery electrodes, electrode manufacturing, etc., can solve the problems of poor dispersion of positive electrode materials, insufficient combustion, insufficient rate performance, etc., achieve high uniformity, reduce demand, The effect of improving the magnification performance

Active Publication Date: 2019-07-19
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Using the sol-gel self-propagating combustion method to prepare lithium-ion battery cathode materials, the primary problem to be solved is that when traditional citric acid and nitrate are used as sols, the combustion is not sufficient enough to make the dispersion of the final cathode material poor, resulting in Insufficient magnification performance
In addition, nitrate as a sol will produce a large amount of NO or NO in the combustion process 2 , leading to air pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Dissolve lithium carbonate, nickel carbonate, cobalt carbonate and aluminum carbonate in deionized water according to the molar ratio of 1.1:0.6:0.3:0.1, and stir evenly, wherein the concentration of metal ions is 2mol / L; Add glutamic acid into the solution at a molar ratio of 1:1, add sodium fluoride at a molar ratio of 1:2 between sodium fluoride and glutamic acid, and stir evenly to make a mixed solution;

[0043] (2) Put the mixed solution obtained in step (1) in a water bath at 80°C until the water is fully evaporated to obtain a sol, place the obtained sol in an evaporating dish, heat up to 90°C in an oven and dry until the dry gel is formed ;

[0044] (3) heating the xerogel obtained in step (2) to 350° C. in an oven, and keeping it warm for 2 hours, so that the xerogel self-propagatingly burns to fully generate a fluffy powder;

[0045] (5) Under an oxygen atmosphere, heat up the powder obtained in step (3) to 600°C at a rate of 10°C / min for pre-sintering f...

Embodiment 2

[0048] (1) Dissolve lithium carbonate, nickel carbonate, cobalt carbonate and aluminum carbonate in deionized water according to the molar ratio of 1.2:0.8:0.15:0.05, and stir evenly, wherein the concentration of metal ions is 2mol / L; Add glutamic acid into the solution at a molar ratio of 1:2, add sodium fluoride at a molar ratio of 2:1 between sodium fluoride and glutamic acid, stir evenly, and make a mixed solution;

[0049] (2) Put the mixed solution obtained in step (1) in a water bath at 100°C until the water is fully evaporated to obtain a sol, put the obtained sol in an evaporating dish, heat up to 70°C in an oven and dry until the dry gel is formed ;

[0050] (3) heating the xerogel obtained in step (2) to 400° C. in an oven, and keeping it warm for 1 hour, so that the xerogel self-propagatingly burns to fully generate a fluffy powder;

[0051] (5) Under an oxygen atmosphere, heat up the powder obtained in step (3) to 400°C at a rate of 50°C / min for pre-sintering for...

Embodiment 3

[0054] (1) Lithium carbonate, nickel carbonate, cobalt carbonate and aluminum carbonate are dissolved in deionized water according to the molar ratio of 1.2:0.5:0.2:0.3, and stirred evenly, wherein the concentration of metal ions is 3.5mol / L; Add glutamic acid to the solution at a molar ratio of 2:1 for metal ions, add sodium fluoride at a molar ratio of 1:1 between sodium fluoride and glutamic acid, stir evenly, and make a mixed solution;

[0055] (2) Put the mixed solution obtained in step (1) in a water bath at 75°C until the water is fully evaporated to obtain a sol, place the obtained sol in an evaporating dish, and heat up to 100°C in an oven to dry until the dry gel is formed ;

[0056] (3) heating the xerogel obtained in step (2) to 270° C. in an oven, and keeping it warm for 2.5 hours, so that the xerogel self-propagatingly burns to fully generate a fluffy powder;

[0057] (5) Under an oxygen atmosphere, heat up the powder obtained in step (3) to 550°C for 7 hours at...

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Abstract

The invention relates to a method for preparing a ternary high-nickel positive electrode material by employing a sol-gel self-propagating combustion method. The ternary high-nickel positive electrode material is LiNi<1-x-y>CoxAlyO2 (1-x-y is greater than 0.5, x is smaller than 1 and greater than 0 and y is smaller than 1 and greater than 0). The method comprises the steps of mixing and dissolving a lithium source, a nickel source, a cobalt source and an aluminum source into deionized water, adding glutamic acid and sodium fluoride to obtain a mixed solution; preparing dry gel from the mixed solution; carrying out heating and heat preservation, and carrying out complete self-propagating combustion on the dry gel to generate fluffy powder; and carrying out heat treatment on the powder to prepare lithium nickel cobalt aluminate positive electrode material. Sol-gel self-propagating combustion is carried out to prepare the lithium nickel cobalt aluminate by employing a glutamic acid as water-soluble gel and sodium fluoride as a catalyst. According to the method, the rate capability of the material can be improved, the cycling stability of the material is improved and the first cycling specific discharge capacity reaches 270-320mAh / g; and meanwhile, the requirements on heat treatment equipment can be reduced and the method has a good application prospect.

Description

technical field [0001] The invention relates to the field of battery material preparation, in particular to a method for preparing a ternary high-nickel positive electrode material by a sol-gel self-propagating combustion method. Background technique [0002] With the vigorous development of new energy vehicles, the lithium-ion battery industry has entered a stage of rapid development. The key materials that affect the performance of lithium-ion batteries mainly include positive electrode materials, negative electrode materials, and electrolytes. Among them, the positive electrode material is currently the main factor limiting battery performance, and it is also the main factor accounting for the high cost of lithium-ion batteries, which is close to 40%. [0003] In recent years, the most studied cathode materials are mainly lithium iron phosphate, lithium manganese oxide, and ternary materials. Among them, ternary materials have outstanding advantages in terms of cost and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/525
CPCH01M4/0471H01M4/525Y02E60/10
Inventor 谭强强夏青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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