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A kind of negative electrode material of lithium ion battery and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problem of graphite layer peeling, safety problems, poor cycle life, and graphite interlayer expansion. And other issues

Active Publication Date: 2021-06-04
青岛泰达华润新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Due to its regular layered structure, the cross section is easy to react with the electrolyte, and solvents such as PC will be embedded in the graphite layer to cause the graphite layer to peel off, which is prone to safety problems and leads to poor cycle life
[0005] 2. The problem of graphite interlayer expansion

Method used

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  • A kind of negative electrode material of lithium ion battery and preparation method thereof
  • A kind of negative electrode material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] ①Put 60kg of absolute ethanol into the reaction kettle, choose D50=12μm, specific surface area=7.5m 2 / g, tap density is 0.98g / cm 3 The spherical natural graphite of 40kg is dropped into absolute ethanol, and stirred for 1h to form a uniform slurry. Add 1.2 kg of titanium isopropoxide to the slurry, react at 40° C. for 2 hours while stirring, then wash and filter with ethanol and deionized water in sequence to obtain an intermediate product A.

[0042] ②Put 40 kg of intermediate product A into 60 kg of 10 mol / L sodium hydroxide aqueous solution, react in a reactor at 200° C. for 24 hours, wash and filter with deionized water to obtain solid particle intermediate product B.

[0043]③Put 40 kg of the intermediate product B into 60 kg of 1 mol / L hydrochloric acid solution, react in the reactor at room temperature for 24 hours while stirring, then use deionized water to pH=6.5, filter to obtain solid particles, and dry at 100°C to obtain intermediate Product C.

[0044] ...

Embodiment 2

[0047] ①Put 50kg of absolute ethanol into the reaction kettle, choose D50=8μm, specific surface area=2.5m 2 / g, the tap density is 0.85g / cm 3 50kg of the artificial graphite is dropped into absolute ethanol, stirred for 1h to form a uniform slurry. Add 0.5 kg of titanium isopropoxide to the slurry, react at 35° C. for 1.5 hours while stirring, then wash and filter with ethanol and deionized water in sequence to obtain an intermediate product A.

[0048] ②Put 45 kg of intermediate product A into 55 kg of 10 mol / L sodium hydroxide aqueous solution, react in a reaction kettle at 210° C. for 20 hours, wash and filter with deionized water to obtain solid particle intermediate product B.

[0049] ③ Put 45 kg of the intermediate product B into 55 kg of 1 mol / L hydrochloric acid solution, react in the reactor at room temperature for 20 hours while stirring, then use deionized water to pH = 6.5, filter to obtain solid particles, and dry at 100 ° C to obtain intermediate Product C.

...

Embodiment 3

[0053] ①Put 55kg of absolute ethanol into the reaction kettle, choose D50=8μm, specific surface area=2.5m 2 / g, the tap density is 0.85g / cm 3 artificial graphite, and D50=12μm, specific surface area=7.5m 2 / g, tap density is 0.98g / cm 3 According to the ratio of 6:4, mix the two kinds of graphite, put 50kg of the mixed graphite into absolute ethanol, and stir for 1h to form a uniform slurry. Add 1.0 kg of titanium isopropoxide to the slurry, react at 35° C. for 2 hours while stirring, then wash and filter with ethanol and deionized water in sequence to obtain an intermediate product A.

[0054] ②Put 45 kg of the intermediate product A into 55 kg of 10 mol / L sodium hydroxide aqueous solution, react in the reactor at 210° C. for 24 hours, wash and filter with deionized water to obtain the solid particle intermediate product B.

[0055] ③Put 45 kg of the intermediate product B into 55 kg of 1 mol / L hydrochloric acid solution, react in the reactor at room temperature for 24 hour...

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Abstract

The invention relates to a preparation method of a lithium-ion battery negative electrode material. Anhydrous alcohol is added to a reactor, a certain amount of graphite raw material is added to the anhydrous alcohol, a uniform slurry is formed by stirring, and a certain amount of titanium compound is dropped into the Alcohol solution or liquid titanium compound, react for a certain period of time while stirring at a certain temperature, wash with ethanol and deionized water in turn, and filter to obtain the intermediate product A; disperse the intermediate product A into the sodium hydroxide solution and place it in the reaction kettle , heated to a certain temperature, and kept for a certain period of time; washed with deionized water, and filtered to obtain an intermediate product B; dispersed the intermediate product B into a hydrochloric acid solution, placed in a reaction kettle for stirring, and reacted for a certain period of time. Wash with deionized water until it is close to neutral, filter to obtain solid particles, and dry them at a certain temperature to obtain an intermediate product C; calcinate the intermediate product C, and calcine at a certain temperature for a certain period of time to obtain nano-titanium dioxide coating Graphite anode material.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Since Sony commercialized lithium-ion batteries using hard carbon as the anode material in 1991, carbonaceous materials have been widely used as anode materials for lithium-ion batteries due to their low lithium intercalation potential, relatively cheap price, abundant reserves and easy availability. [0003] Among them, graphite material is currently the mainstream anode material due to its outstanding advantages such as high reversible specific capacity, high initial efficiency, and voltage platform, and will remain an important candidate for lithium-ion battery anode materials in the future. However, graphite materials still have the following problems: [0004] 1. Due to its regular layered structure, the cross-section is easy to react with the electrolyte, and solvents such as PC will be embedded in the graphi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/587H01M10/0525Y02E60/10
Inventor 裴德成郭华德
Owner 青岛泰达华润新能源科技有限公司
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