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A kind of self-healing lithium ion battery silicon-based negative electrode material and preparation method thereof

A technology for silicon-based negative electrode materials and lithium-ion batteries, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as battery loss of function and internal structure damage, and achieve improved conductivity, low cost, and improved cycle performance Effect

Active Publication Date: 2022-08-09
KAIFENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on the characteristics of self-healing, this type of material can also show excellent characteristics in lithium-ion batteries, because the internal structure of lithium batteries also suffers from certain mechanical damage during the charge-discharge cycle, which eventually leads to The battery loses its original function

Method used

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  • A kind of self-healing lithium ion battery silicon-based negative electrode material and preparation method thereof
  • A kind of self-healing lithium ion battery silicon-based negative electrode material and preparation method thereof

Examples

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example 1

[0018] such as figure 1 Shown is the silicon-based anode material for lithium-ion batteries. It includes a self-healing layered silicon-based material, which uses layered silicon or silicon-carbon material as a core matrix, and is uniformly coated with a high polymer film layer with self-healing ability, and the high polymer film layer is composed of It is composed of multiple cross-linked self-healing adhesive and conductive agent. The silicon-based negative electrode material for lithium ion batteries is characterized in that the multiple cross-linked self-healing binder includes exchangeable non-polar covalent bonds and exchangeable polar covalent bonds such as polyurethane, polyacrylic acid esters and titanates. Preferred are branched polypropylene carbonate composite polyurethane (PPC-PU), polyacrylate and butyl titanate, the conductive agent is hydroxylated carbon nanotubes; the silicon-based or silicon-carbon material is micron or nanoscale particles Material. The m...

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Abstract

The invention provides a silicon-based negative electrode material for a self-healing lithium ion battery and a preparation method thereof. Specifically, it is a self-healing layered silicon-based material, which uses granular silicon or silicon-carbon material as a core matrix, and is uniformly coated with a self-healing polymer film layer. It is composed of multiple cross-linked self-healing adhesives and conductive agents. The preparation method includes the following steps: Step 1: preparation of polyurethane material. Step 2: Preparation of multiple cross-linked self-healing adhesives. Step 3: Preparation of self-healing silicon matrix composites.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and more particularly, to a silicon-based negative electrode material with multiple cross-linked self-healing binders for lithium ion batteries and a preparation method thereof. Background technique [0002] With the increasing demand for energy storage, lithium-ion batteries need larger and higher energy density in order to reflect more excellent electrochemical performance. The commercial negative electrode material is mainly graphite material. Although graphite material has the advantages of low price and stable performance, the theoretical specific capacity of this material is only 372mAh.g4, which is far from meeting the needs of modern energy storage batteries. Therefore, the development of a new type of anode material with higher specific energy has become an urgent need for lithium-ion batteries to improve the overall battery specific capacity. The theoretical mass specific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/38H01M10/0525
CPCH01M4/366H01M4/386H01M4/622H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 刘进郝延蔚王丽孙瑞敏周永恒周华
Owner KAIFENG UNIV