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Silicon-based composite anode material for lithium ion battery, preparation method thereof, and lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc. capacity attenuation and other issues, to achieve the effect of favorable exchange, high energy density, and increased contact area

Active Publication Date: 2019-05-10
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon-based negative electrode materials have a large volume effect in the process of intercalation and deintercalation of lithium ions, and are prone to structural damage and pulverization, resulting in rapid decline in battery capacity and even loss of cycle capacity.
[0004] In view of the above problems, the commonly used solutions are to nanometerize silicon-based materials, or compound them with materials with buffer functions, etc., but these methods cannot solve the volume effect of silicon-based materials well.

Method used

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  • Silicon-based composite anode material for lithium ion battery, preparation method thereof, and lithium ion battery

Examples

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Embodiment 1

[0046] A preparation method for a silicon-based composite negative electrode material for a lithium ion battery, comprising the following steps:

[0047] (1) Preparation of metal-organosilicon framework materials:

[0048] Add 0.15 mol of silver nitrate, 1 mol of silicon dioxide and 0.6 mol of dihydroxytartaric acid into the reaction kettle, add an aqueous solution of NaOH, mix well, stir and react the mixture at 80°C for 14 hours, and use the obtained reaction product with After washing with ethanol several times, the metal-organosilicon framework material was obtained by drying.

[0049] (2) Preparation of silicon-based composite anode material precursor

[0050] Mix the above metal-organosilicon framework material with 1.5mol silicon-tin alloy particles (with a particle size of 500nm) uniformly to obtain a silicon-based composite negative electrode material precursor.

[0051] (3) Sintering:

[0052] The precursor obtained in step (2) was placed in a tube furnace under a...

Embodiment 2

[0055] The silicon-based composite negative electrode material of this example was prepared in the same manner as in Example 1, except that 0.05 mol of aluminum nitrate was added in step (1).

Embodiment 3

[0057] A preparation method for a silicon-based composite negative electrode material for a lithium ion battery, comprising the following steps:

[0058] (1) Preparation of metal-organosilicon framework materials:

[0059] Add 0.12 mol of zinc chloride, 1 mol of tetraethyl orthosilicate and 1 mol of 2,4 dihydroxybenzoic acid and triethylamine into the reaction kettle, mix evenly, and stir the mixture at 100°C for 12 hours. The obtained reaction product was washed with ethanol several times, and then dried to obtain the metal-organosilicon framework material.

[0060] (2) Preparation of silicon-based composite anode material precursor:

[0061] Mix the metal-organosilicon framework material with 0.8 mol of silicon nanoparticles (particle diameter D50 is 30nm) to obtain a silicon-based composite negative electrode material precursor.

[0062] (3) Sintering:

[0063] The precursor obtained in step (2) was placed in a tube furnace under a nitrogen protective atmosphere, and the...

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Abstract

The invention provides a silicon-based composite anode material for a lithium ion battery, comprising a three-dimensional porous network skeleton, and a silicon-based material loaded on the three-dimensional porous network skeleton, wherein the three-dimensional porous network skeleton is formed by thermal decomposition of a metal source, and a complex of a silicon source and an organic ligand. The volume effect of the silicon-based material in the silicon-based composite anode material is small, and the subsequent contact area with the electrolyte is large. The invention also provides a method of preparing the silicon-based composite anode material, and a lithium ion battery produced thereby.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a silicon-based composite negative electrode material for lithium ion batteries, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion battery is currently the most widely used secondary battery. Due to its advantages of specific capacity, high charge and discharge efficiency, good cycle performance and low cost, it has become a research hotspot in the battery industry. Important components, which affect the specific energy and cycle life of lithium-ion batteries, have always been the focus of lithium-ion battery research. [0003] Silicon-based anode materials have the highest lithium storage capacity and low voltage platform, and are regarded as the most promising anode materials for lithium-ion batteries. However, silicon-based negative electrode materials have a large volume effect during the intercalation and deintercalation ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 尚伟丽孔令涌李洁凤任望保
Owner SHENZHEN DYNANONIC
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