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Ceramic lithium battery negative electrode material adopting semi-hollow structure and preparation method

A negative electrode material, lithium battery technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of poor stability of positive and negative electrode materials, low capacity, material and binder, SEI film shedding, etc., to achieve a solution Effect of macroscopic volume deformation and elimination of volume deformation

Inactive Publication Date: 2018-11-23
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to various problems such as low capacity, poor stability of positive and negative materials, etc., further research and improvement are needed.
The current negative electrode materials are mainly carbon-based materials, and non-carbon-based materials are mainly silicon-based. However, the silica gel with a solid content of 15% has a large volume deformation during the lithium intercalation process, which leads to material and bonding problems. The agent and SEI film fall off, which affects the service life of the negative electrode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A lithium battery negative electrode material of a semi-hollow structure ceramic of the present invention is prepared by the following method:

[0023] (a). Mix water and conductive ceramic powder in a weight ratio of 6:85 to form a conductive ceramic slurry; mix rare earth oxide cerium oxide and conductive ceramic slurry in a weight ratio of 1:110 to obtain a rare earth doped conductive ceramic slurry precursor;

[0024] (b). Nano-silicon, silica gel with a solid content of 15% and a polyethylene spherical polymer material of 50 μm are mixed according to a mass ratio of 100:100:5 to obtain a mixture;

[0025] (c). Mix the mixture described in step (b) with the conductive ceramic slurry precursor according to a weight ratio of 100:85, and grind for 30 minutes;

[0026] Mixing ball milling to obtain a mixed precursor;

[0027] (d). The mixed precursor after ball milling in step (c) was left to stand for 23 hours. After the ceramic slurry was dehydrated and solidified, ...

Embodiment 2

[0029] A lithium battery negative electrode material of a semi-hollow structure ceramic of the present invention is prepared by the following method:

[0030] (a). Mix conductive ceramic slurry with water and conductive ceramic powder in a weight ratio of 12:110; mix rare earth oxide ceria and conductive ceramic slurry in a weight ratio of 4:110 to obtain rare earth doped Conductive ceramic slurry precursor;

[0031] (b). Mix nano-silicon, silica gel with a solid content of 15% and polymethyl methacrylate spherical polymer material of 10 μm, and obtain a mixture according to a mass ratio of 100:100:10;

[0032] (c). Mix the mixture described in step (b) with the conductive ceramic slurry precursor according to a weight ratio of 120:85, and grind for 50 minutes;

[0033] Mixing ball milling to obtain a mixed precursor;

[0034] (d). The mixed precursor after ball milling in step (c) was static for 24 hours. After the ceramic slurry was dehydrated and solidified, the temperatu...

Embodiment 3

[0036] A lithium battery negative electrode material of a semi-hollow structure ceramic of the present invention is prepared by the following method:

[0037] (a). Mix water and conductive ceramic powder in a weight ratio of 10:90 to form a conductive ceramic slurry; mix rare earth oxide europium trioxide and conductive ceramic slurry in a weight ratio of 4:110 to obtain a rare earth doped conductive ceramic slurry precursor;

[0038] (b). Mix nano-silicon, silica gel with a solid content of 15% and a polystyrene spherical polymer material of 20 μm, and obtain a mixture according to a mass ratio of 100:10020:5;

[0039](c). Mix the mixture described in step (b) with the conductive ceramic slurry precursor according to a weight ratio of 100:100, and grind for 60 minutes;

[0040] Mixing ball milling to obtain a mixed precursor;

[0041] (d). The mixed precursor after ball milling in step (c) was left to stand for 24 hours. After the ceramic slurry was dehydrated and solidifie...

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Abstract

The invention relates to the technical field of lithium battery negative electrode materials, in particular to a ceramic lithium battery negative electrode material adopting a semi-hollow structure, and a preparation method. A rare-earth oxide is mixed with conductive ceramic slurry to obtain a rare-earth-doped conductive ceramic slurry precursor; nano-silicon and silicon dioxide gel are mixed with a spherical high molecular material to obtain a mixture; and standing is performed after the mixture and the conductive ceramic precursor are subjected to mixing and ball milling, after the ceramicslurry is dewatered and solidified, sintering is performed by quick heating, and then natural cooling is performed to the room temperature, thereby obtaining the lithium battery negative electrode material adopting a similar core-shell structure. By virtue of the preparation method, the problem of macroscopic volume deformation of a silicon-based negative electrode in a charging or discharging process is solved.

Description

technical field [0001] The invention relates to the technical field of lithium battery negative electrode materials, in particular to a semi-hollow structure ceramic lithium battery negative electrode material and a preparation method. Background technique [0002] Lithium-ion batteries have become the mainstream products of commercial batteries due to their excellent characteristics. However, due to various problems such as low capacity and poor stability of positive and negative materials, further research and improvement are needed. The current negative electrode materials are mainly carbon-based materials, and non-carbon-based materials are mainly silicon-based. However, the silica gel with a solid content of 15% has a large volume deformation during the lithium intercalation process, which leads to material and bonding problems. The agent and SEI film fall off, thereby affecting the service life of the negative electrode material. Therefore, the suppression of volume ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/48H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD