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High-nickel ternary cathode material coated with fast ion conductor and preparation method thereof

A technology of ion conductor and positive electrode material, which is applied to the field of high nickel ternary positive electrode material coated with fast ion conductor and its preparation field, can solve the problems of increased internal resistance of battery and reduced discharge specific capacity, and achieves reduction of internal resistance of battery, The effect of reducing polarization and ensuring capacity

Inactive Publication Date: 2020-01-14
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a high-nickel ternary positive electrode material coated with a fast ion conductor and a preparation method thereof, the purpose of which is to solve the problems that the internal resistance of the battery increases and the discharge specific capacity decreases after the ternary positive electrode material is coated and modified

Method used

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  • High-nickel ternary cathode material coated with fast ion conductor and preparation method thereof
  • High-nickel ternary cathode material coated with fast ion conductor and preparation method thereof
  • High-nickel ternary cathode material coated with fast ion conductor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Weigh 0.1653g of ethyl orthosilicate C 8 h 20 o 4 Si(TEOS), 0.2977g of Al(NO 3 ) 3 9H 2 O and 0.0547 g of LiNO 3 Put it into a beaker, add 60mL of alcohol, and add 2.5g of citric acid as a templating agent, and keep stirring in an oil bath at 80°C for 3h.

[0037] (2) Weigh 10.0 g of the precursor, add it into the solution of (1), and keep stirring and mixing for 6 hours.

[0038] (3) When the solution in (2) is stirred at 100°C and becomes sol-gel, take it out and dry it in an oven at 120°C for 24 hours; grind the obtained solid to obtain a powder material of 1wt% lithium aluminum silicate-coated precursor ;

[0039] (4) After weighing a certain mass of the powder obtained in (3), subtract the mass of the coated substance, and add lithium hydroxide according to the molar ratio of lithium to transition metal element 1:1.05, (such as the mass of the precursor after deducting is 9.8 g, calculate the molar mass of the transition metal element in the precursor to ...

Embodiment 2

[0061] (1) Weigh 1.1571g of tetraethyl orthosilicate C 8 h 20 o 4 Si(TEOS), 2.0839g of Al(NO 3 ) 3 9H 2 O and 0.3829g of LiNO 3 Put it into a beaker, add 60mL of alcohol, and add 2.5g of citric acid as a templating agent, and keep stirring in an oil bath at 80°C for 3h.

[0062] (2) Weigh 10.0 g of the precursor, add it into the solution of (1), and keep stirring and mixing for 6 hours.

[0063] (3) After the solution in (2) is stirred into a sol-gel form, take it out and put it in an oven at 120° C. to dry for 24 hours; and grind the obtained solid evenly to obtain a 7wt% lithium aluminum silicate-coated precursor powder material;

[0064] (4) After weighing a certain mass of the powder obtained in (3), subtract the mass of the coated substance, add lithium hydroxide according to the molar ratio of lithium to transition metal element 1:1.05, and mix and mix;

[0065] (5) Pre-sinter the powder mixed in (4) at 480°C for 6 hours; sinter at 800°C for 15 hours, the sinterin...

Embodiment 3

[0073] (1) Weigh 0.1653g of ethyl orthosilicate C 8 h 20 o 4 Si(TEOS), 0.2977g of Al(NO 3 ) 3 9H 2 O and 0.0547 g of LiNO 3 Put it into a beaker, add 60mL of alcohol, and add 2.5g of citric acid as a templating agent, and keep stirring in an oil bath at 80°C for 3h.

[0074] (2) Weigh 10.0 g of the precursor, add it into the solution of (1), and keep stirring and mixing for 6 hours.

[0075] (3) After the solution in (2) is stirred into a sol-gel state, take it out and put it in an oven at 120° C. to dry for 24 hours; and grind the obtained solid evenly to obtain a powder material of 1 wt% lithium aluminum silicate-coated precursor;

[0076] (4) After weighing a certain mass of the powder obtained in (3), subtract the mass of the coating material, add lithium hydroxide according to the molar ratio of lithium to transition metal element 1:1.05, and mix it;

[0077] (5) Pre-sinter the powder mixed in (4) at 480°C for 6 hours; sinter at 900°C for 15 hours, the sintering he...

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Abstract

The invention provides a high-nickel ternary cathode material coated with a fast ion conductor and a preparation method thereof. The high-nickel ternary cathode material is spherical or spheroidic secondary particles composed of primary particles, the diameter of the high-nickel ternary cathode material is 1-30 [mu]m, and the chemical formula of the high-nickel ternary cathode material is LiNi0.8Co0.1Mn0.1O2. The preparation method comprises the following steps of: weighing raw materials for synthesizing the fast ion conductor in proportion, and uniformly dispersing the raw materials in a solvent to obtain a mixed solution; adding the high-nickel ternary precursor into the mixed solution, and then performing stirring, drying and grinding to obtain high-nickel ternary precursor powder coated with the fast ion conductor; and uniformly mixing the obtained precursor powder with a lithium salt, and performing sintering to obtain the high-nickel ternary cathode material coated with the fastion conductor. The fast ion conductor material is used as a coating substance of the ternary cathode material and can provide a fast transmission channel for lithium ion transmission, so that the purpose of reducing the internal resistance of the battery is achieved; and after coating, the cycling stability of the battery is improved under the condition that the specific discharge capacity of thebattery is not reduced.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a high-nickel ternary positive electrode material coated with a fast ion conductor and a preparation method thereof. Background technique [0002] Due to its light weight, good stability, no memory effect, and environmental friendliness, lithium-ion batteries have been widely used in portable devices, power tools, drones, and household appliances. However, in recent years, with the rapid development of new energy vehicles, people have gradually increased their requirements for lithium-ion batteries as their energy storage devices, such as reducing the internal resistance of lithium-ion batteries, increasing output power, and improving cycle stability. [0003] High-nickel ternary cathode materials have become the most potential materials for lithium-ion battery cathode materials to be used in new energy vehicles due to their high platform, hig...

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
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 王志兴莫文彬郭华军李新海王接喜颜果春胡启阳彭文杰吴雨琪谭欣欣蒋湘康
Owner CENT SOUTH UNIV
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