Tin oxide-hard carbon composite negative electrode material, and preparation method and application thereof

A technology of tin oxide and negative electrode materials, which is applied in the field of tin oxide-hard carbon composite negative electrode materials and its preparation, can solve the problems that cannot completely solve the problem of alloyed negative electrode expansion, and achieve the convenience of large-scale application and operability Strong, simple preparation process

Inactive Publication Date: 2021-02-05
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to increase the specific capacity of hard carbon materials, it is a good strategy to combine hard carbon materials with high-capacity alloying reaction negative electrodes: on the one hand, the introduction of alloying reaction negative electrodes can greatly increase the specific capacity of materials; on the other hand, Hard carbon materials can also be used as a buffer matrix for alloying reaction-type negative electrodes, reducing the damage to the electrode structure caused by volume expansion during charging and discharging, improving the conductivity of the electrode, and further optimizing the electrochemical performance of the electrode material. A single carbonaceous compound cannot completely solve the expansion problem caused by the alloyed negative electrode, and there is still room for modification
[0006] To sum up, the prior art still lacks a negative electrode material that has a high specific capacity and high stability, and is composited with a carbon-based negative electrode and an alloyed negative electrode with a precise structural design.

Method used

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  • Tin oxide-hard carbon composite negative electrode material, and preparation method and application thereof
  • Tin oxide-hard carbon composite negative electrode material, and preparation method and application thereof
  • Tin oxide-hard carbon composite negative electrode material, and preparation method and application thereof

Examples

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Embodiment 1

[0037] A preparation method for a tin oxide-hard carbon composite negative electrode material, comprising the steps of:

[0038] Preparation of sacrificial templates by emulsion polymerization:

[0039] Under the condition of 80°C, add 0.5g sodium lauryl sulfate and 0.2g sodium bicarbonate into 250ml deionized water and stir, then drop 40ml styrene monomer and 0.1g potassium persulfate into the solution, stir for 14 hour, obtain polystyrene macromolecule sacrificial templating agent;

[0040] Mix 2g of catechol and 2ml of 37%wt formaldehyde solution in 80ml of deionized water, add 1g of sodium stannate and 20ml of sacrificial template solution, mix and stir to prepare the precursor solution;

[0041] The precursor solution is granulated by spray drying method to obtain precursor particles. The spray drying is air flow type, the inlet air temperature is 180°C, the outlet air temperature is 60°C, and the feed rate is 2ml / s;

[0042] The precursor particles were calcined at 550...

Embodiment 2

[0055] A preparation method for a tin oxide-hard carbon composite negative electrode material, comprising the steps of:

[0056] Preparation of sacrificial templates by emulsion polymerization:

[0057] Under the condition of 80°C, add 0.5g sodium lauryl sulfate and 0.2g sodium bicarbonate into 250ml deionized water and stir, then drop 40ml styrene monomer and 0.1g potassium persulfate into the solution, stir for 14 hour, obtain polystyrene macromolecule sacrificial templating agent;

[0058] Mix 2g of catechol and 2ml of 37%wt formaldehyde solution in 80ml of deionized water, add 1g of sodium stannate and 20ml of sacrificial template solution, mix and stir to prepare the precursor solution;

[0059] The precursor solution is granulated by spray drying method to obtain precursor particles. The spray drying is air flow type, the inlet air temperature is 180°C, the outlet air temperature is 60°C, and the feed rate is 2ml / s;

[0060] Precursor particles were calcined at 500°C f...

Embodiment 3

[0062] A preparation method for a tin oxide-hard carbon composite negative electrode material, comprising the steps of:

[0063] Preparation of sacrificial templates by emulsion polymerization:

[0064] Under the condition of 80°C, add 0.5g sodium lauryl sulfate and 0.2g sodium bicarbonate into 250ml deionized water and stir, then drop 40ml styrene monomer and 0.1g potassium persulfate into the solution, stir for 14 hour, obtain polystyrene macromolecule sacrificial templating agent;

[0065] Mix 2g of phenol and 1ml of 80%wt furfural solution in 80ml of deionized water, add 1g of sodium stannate and 20ml of sacrificial template solution, mix and stir to prepare the precursor solution;

[0066] The precursor solution is granulated by spray drying method to obtain precursor particles. The spray drying is air flow type, the inlet air temperature is 200°C, the outlet air temperature is 60°C, and the feed rate is 2ml / s;

[0067] The precursor particles were calcined at 550° C. f...

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Abstract

The invention relates to a preparation method of a tin oxide-hard carbon composite negative electrode material. The preparation method comprises the following steps: mixing and stirring a phenolic monomer, an aldehyde monomer, tin salt, a sacrificial template agent and water to prepare a precursor solution; granulating the precursor solution by a spray drying method to obtain precursor particles;and calcining the precursor particles to obtain the tin oxide-hard carbon composite negative electrode material. The tin oxide-hard carbon composite negative electrode material is prepared according to the preparation method. The invention discloses an application of a tin oxide-hard carbon composite negative electrode material in a lithium ion battery. The preparation method has the beneficial effects that hard carbon and tin oxide with high specific capacity are compounded by using the spray drying method, so that the test specific capacity of the lithium ion battery is improved and is muchhigher than that of a commercial graphite material; and the cycling stability of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a tin oxide-hard carbon composite negative electrode material and a preparation method and application thereof. Background technique [0002] The current application scenarios such as 3C products, electric vehicles, and energy storage power stations put forward higher requirements for lithium-ion batteries, and hope to store more power with smaller volume or lighter weight, so the quality / volume of lithium-ion batteries is improved Energy density is crucial to lithium-ion batteries, and improving the specific capacity of electrode materials is one of the important strategies to increase the energy density of lithium-ion batteries. Among them, the negative electrode material is based on carbon, and the composite alloy negative electrode with high specific capacity is important way. [0003] Hard carbon materials are non-graphitizable amorphous carbon materials with short-rang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/04H01M10/0525
CPCH01M4/364H01M4/483H01M4/625H01M4/0471H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 韩建涛范晨阳方淳
Owner HUAZHONG UNIV OF SCI & TECH
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