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A coating modification method for preparing high-temperature lithium-ion battery lithium manganate cathode material

A positive electrode material and modification technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of large thickness of coating layer, poor bonding force between coating layer material and lithium manganese oxide, poor cycle performance and rate performance of materials, etc. question

Inactive Publication Date: 2015-08-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating layer obtained by this method is uneven, the thickness of the coating layer is relatively large, and the binding force between the coating layer material and lithium manganate is poor, so the cycle performance and rate performance of the material are still relatively poor.

Method used

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  • A coating modification method for preparing high-temperature lithium-ion battery lithium manganate cathode material
  • A coating modification method for preparing high-temperature lithium-ion battery lithium manganate cathode material
  • A coating modification method for preparing high-temperature lithium-ion battery lithium manganate cathode material

Examples

Experimental program
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Effect test

Embodiment example 1

[0024] Add the ethanol solution of tetrabutyl titanate to LiMn 2 O 4 In the ethanol suspension (of which LiMn 2 O 4 The mass ratio to tetrabutyl titanate is 10:1), and continue to stir for 20 minutes. Then, it was transferred to a hydrothermal reaction kettle and kept at 150°C for 5 hours. After cooling to room temperature, the precipitate was filtered and washed several times to obtain an amorphous titanium oxide-coated lithium manganate precursor; The body is fully mixed with a certain amount of lithium hydroxide in ethanol solution, dried at 80°C, and after grinding, treated in an air atmosphere at 700°C in a high-temperature furnace for 12 hours to obtain Li 4 Ti 5 O 12 Coated modified LiMn 2 O 4 Cathode material. figure 1 It is an X-ray diffraction pattern, the analysis of the modified material does not affect the main material LiMn 2 O 4 Spinel structure. figure 2 Is Li 4 Ti 5 O 12 Coated modified LiMn 2 O 4 Photo of cathode material, showing Li 4 Ti 5 O 12 The coating is ...

Embodiment example 2

[0027] Add the ethylene glycol solution of tetrabutyl titanate to LiMn 2 O 4 Ethylene glycol suspension (of which LiMn 2 O 4 The mass ratio to tetrabutyl titanate is 10:1), and continue to stir for 20 minutes. Then, it was transferred to a hydrothermal reactor and kept at 120°C for 15 hours. After cooling to room temperature, the precipitate was filtered and washed several times to obtain an amorphous titanium oxide-coated lithium manganate precursor; The body is thoroughly mixed with a certain amount of lithium nitrate in methanol solution, dried at 80°C, and after grinding, treated in an air atmosphere at 750°C in a high-temperature furnace for 10 hours to obtain Li 4 Ti 5 O 12 Coated modified LiMn 2 O 4 Cathode material.

Embodiment example 3

[0029] Add the ethanol solution of tetrabutyl titanate to LiMn 2 O 4 In the ethanol suspension (of which LiMn 2 O 4 The mass ratio to tetrabutyl titanate is 15:1), continue to stir for 20 minutes. Then, it was transferred to a hydrothermal reactor and kept at 200°C for 2 hours. After cooling to room temperature, the precipitate was filtered and washed several times to obtain an amorphous titanium oxide-coated lithium manganate precursor; The body is thoroughly mixed with a certain amount of lithium acetate in ethylene glycol solution, dried at 120°C, and after grinding, treated in an air atmosphere at 800°C in a high-temperature furnace for 5 hours to obtain Li 4 Ti 5 O 12 Coated modified LiMn 2 O 4 Cathode material.

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Abstract

The invention discloses a coating and modification method of spinel lithium manganate and an application of the spinel lithium manganate as high-temperature lithium-ion-battery cathode materials. The method is characterized in that lithium titanate coating layers directly grow on surfaces of lithium manganate crystals and have the same lattice orientation as the lithium manganate crystals. According to the method, firstly, a titanium source is added into a suspension of the lithium manganate, then the suspension is transferred to a polytetrafluoroethylene reactor for reaction at the temperature of 80-200 DEG C for 1-24 h, final lithium manganate precursors are obtained and finally mixed with a lithium source to be calcined at the temperature of 500-800 DEG C for 0.5-12 h, and lithium manganate cathode materials, which are epitaxially coated with lithium titanate, of different coating amounts and different coating layer thicknesses are obtained. The lithium manganate cathode materials coated and modified with the method are excellent in normal-temperature and high-temperature cycling performance and rate performance. Problems that the lithium manganate is poor in cycling performance and rate performance when used as the cathode materials of lithium ion batteries are solved.

Description

Technical field [0001] The invention relates to a coating modification method of a lithium ion battery cathode material, in particular to a method for preparing a high temperature lithium titanate coated lithium manganate cathode material and a lithium manganate based on the modification method as a lithium ion battery Application of cathode materials. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products such as mobile phones, notebooks, and cameras due to their high energy density, high power density, high working voltage, low environmental pollution, and low self-discharge. At the same time, lithium-ion batteries are also the most competitive power source in the field of electric vehicles. Compared with traditional cathode materials such as lithium cobalt oxide, spinel lithium manganese oxide has the advantages of abundant resources, low price, environmental friendliness, and good safety to become the most potential power battery ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391
CPCH01M4/485H01M4/505Y02E60/10
Inventor 曹传宝李继利
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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