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

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex preparation process of modified negative electrode materials, high cost of modified coating, poor modification effect, etc., and achieve good results The prospect of industrial production, the effect of excellent appearance and cost reduction

Active Publication Date: 2018-11-09
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the defects of complex preparation process of modified negative electrode materials in the prior art, high cost of modified coating, poor modification effect, etc., and provide a modified lithium ion battery negative electrode material and its Preparation

Method used

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

Examples

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Effect test

Embodiment 1

[0046] A preparation method of a modified lithium-ion battery negative electrode material, comprising the steps of:

[0047] (1) Petroleum pitch I and natural graphite are mixed evenly in a ratio of 0.5:10 by weight to obtain a mixture; the mixture is modified for 15 minutes in an impact surface modification system with a frequency of 45 Hz to obtain a modification materials;

[0048] (2) When the flow rate is 1.0m 3 Under the protection of nitrogen gas per hour, carbonize the modified material at 1200°C to obtain the carbonized material;

[0049](3) Grinding and classifying the carbonized material until the average particle diameter D50 of the particles is 17 μm±2 μm.

Embodiment 2

[0051] A preparation method of a modified lithium-ion battery negative electrode material, comprising the steps of:

[0052] (1) Petroleum pitch I and natural graphite are mixed evenly in a ratio of 1:10 by weight to obtain a mixture; the mixture is modified for 15 minutes in an impact surface modification system with a frequency of 45 Hz to obtain a modification materials;

[0053] (2) When the flow rate is 1.0m 3 Under the protection of nitrogen gas per hour, carbonize the modified material at 1200°C to obtain the carbonized material;

[0054] (3) Grinding and classifying the carbonized material until the average particle diameter D50 of the particles is 17 μm±2 μm.

Embodiment 3

[0056] A preparation method of a modified lithium-ion battery negative electrode material, comprising the steps of:

[0057] (1) Petroleum pitch I and natural graphite are uniformly mixed in a ratio of 1:10 by weight to obtain a mixture; the mixture is modified for 20 minutes in an impact surface modification system with a frequency of 45 Hz to obtain a modification materials;

[0058] (2) When the flow rate is 1.0m 3 Under the protection of nitrogen gas per hour, carbonize the modified material at 1200°C to obtain the carbonized material;

[0059] (3) Grinding and classifying the carbonized material until the average particle diameter D50 of the particles is 17 μm±2 μm.

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Abstract

The invention discloses a modified lithium ion battery negative electrode material and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing an asphaltic carbon precursor and a lithium ion battery negative electrode material at a ratio of 0.1:10)-(2:10), performing modified treatment in an impact-type surface modification system for 5-20 minutes, performing carbonizing treatment on the modified materials under inert atmosphere protection, grinding the carbonized materials, performing stage treatment until the average particle size D50 value of the particles is 8-30 microns, thereby obtaining the product. The preparation method is simple, low-temperature carbonizing treatment is not needed, and the cost is greatly reduced, so that the modified negative electrode material has high tap density, regular morphology and excellent processing performance. The prepared modified lithium ion battery negative electrode material has the advantages of high first charge / discharge efficiency and good cycle performance, the first charge / discharge capacity is over 360mAh / g, and the capacity retention ratio is over 90 percent after 400 times of cycle.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a modified lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] In recent years, electronic products are becoming more and more intelligent and multi-functional. Consumers pay more attention to the energy density and service life of batteries, but at the same time they also require lower prices for electronic products. Therefore, some anode materials with low cost, high energy density and long cycle life have been extensively studied. At present, the negative electrodes of lithium-ion batteries are mainly graphite materials, mainly because graphite materials have the advantages of high conductivity and good charge and discharge platform. However, graphite materials also have certain disadvantages. For example, natural graphite is composed of scale layers, and the van der Waals force is the main force between layers. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/38
CPCH01M4/366H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 刘金峰苗荣荣吴志红丁晓阳吉林波
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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