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Quantum dot water-based coated copper foil for silicon-based negative electrode material and preparation method thereof

A technology of silicon-based negative electrode materials and quantum dots, which is applied in the direction of battery electrodes, electrode carriers/current collectors, structural parts, etc., can solve the problem of reducing the cycle life of lithium-ion cycle batteries, affecting the performance of lithium-ion cycle batteries, and not being able to exert nanometer The effective capacity of silicon powder and other issues can be improved to improve cycle performance and other electrical properties, reduce internal resistance, and reduce impedance

Active Publication Date: 2020-11-06
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of nano-silica powder can effectively relieve the volume expansion of silicon-based negative electrode materials. However, due to the large difference in specific gravity between nano-silica powder and graphite powder, when the two are combined as active materials, after slurrying according to existing conventional methods, the In the process of coating and drying, the difference in specific gravity between the two can easily cause floating slurry and agglomeration of nano silicon powder, which will affect the overall performance of the lithium-ion cycle battery. In this way, not only the effective capacity of nano silicon powder cannot be exerted, but It will also reduce the cycle life of lithium-ion cycle batteries

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  • Quantum dot water-based coated copper foil for silicon-based negative electrode material and preparation method thereof

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Embodiment 1

[0028] A quantum dot water-based coated copper foil for silicon-based negative electrode materials proposed by the present invention is characterized in that its raw materials include: copper foil, binder, solvent, and quantum dots.

[0029] Wherein, the mass ratio between binder, solvent and quantum dot is 2:97.97:0.03;

[0030] The binder is polyimide;

[0031] The solvent is water;

[0032] Quantum dots are prepared according to the following process: single-layer graphene is subjected to ultrasonic crushing or high-speed shearing to obtain quantum dots with a particle size of 5 nm;

[0033] The present invention also proposes a method for preparing a silicon-based negative electrode material with a quantum dot water-based coating copper foil, comprising the following steps:

[0034] S1. Binder pretreatment: Pretreat the binder at 120°C for 6 hours to obtain a pretreated binder;

[0035] S2. Mechanical stirring: put the pretreatment binder in the solvent, stir at a frequ...

Embodiment 2

[0039] A quantum dot water-based coated copper foil for silicon-based negative electrode materials proposed by the present invention is characterized in that its raw materials include: copper foil, binder, solvent, and quantum dots.

[0040] Wherein, the mass ratio between binder, solvent and quantum dot is 1.5:98.45:0.05;

[0041] The binder is made of polyacrylic acid;

[0042] The solvent is water;

[0043] Quantum dots are prepared according to the following process: multilayer graphene is subjected to ultrasonic crushing or high-speed shearing to obtain quantum dots with a particle size of 10nm;

[0044] The present invention also proposes a method for preparing a silicon-based negative electrode material with a quantum dot water-based coating copper foil, comprising the following steps:

[0045] S1. Binder pretreatment: Pretreat the binder at 100°C for 4 hours to obtain a pretreated binder;

[0046] S2. Mechanical stirring: put the pretreatment binder in the solvent, ...

Embodiment 3

[0050] A quantum dot water-based coated copper foil for silicon-based negative electrode materials proposed by the present invention is characterized in that its raw materials include: copper foil, binder, solvent, and quantum dots.

[0051] Wherein, the mass ratio between binder, solvent and quantum dot is 3:96.9:0.1;

[0052] The binder is sodium alginate;

[0053] The solvent is water;

[0054] Quantum dots are prepared according to the following process: multi-layer graphene is subjected to ultrasonic crushing or high-speed shearing to obtain quantum dots with a particle size of 15nm;

[0055] The present invention also proposes a method for preparing a silicon-based negative electrode material with a quantum dot water-based coating copper foil, comprising the following steps:

[0056] S1. Binder pretreatment: Pretreat the binder at 120°C for 12 hours to obtain a pretreated binder;

[0057] S2. Mechanical stirring: put the pretreatment binder in the solvent, stir at a f...

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Abstract

The invention discloses quantum dot-containing waterborne coating copper foil for silicon-based anode material. The quantum dot-containing waterborne coating copper foil comprises the following raw materials: copper foil, a binder, a solvent and a quantum dot. According to the quantum dot-containing waterborne coating copper foil for silicon-based anode material and a preparation method of the quantum dot-containing waterborne coating copper foil, a preparation process is optimized, so that a quantum dot coating is uniformly distributed, cohesiveness between the copper foil and a current collector and a conductive agent can be improved effectively after the copper foil is applied to a lithium-ion silicon-based anode material, internal resistance of a lithium-ion cycle battery is reduced, cycle performance, effective capacity and other electrical properties of the lithium-ion cycle battery are improved, and cycle life of the lithium-ion cycle battery is prolonged effectively.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a quantum dot water-based coated copper foil for a silicon-based negative electrode material and a preparation method thereof. Background technique [0002] With the sustainable and healthy development of the new energy industry, the development of mobile portable electronic products and new energy electric vehicle technology has put forward higher and higher requirements for the development of long-range energy lithium-ion batteries. [0003] Compared with the traditional graphite negative electrode, the theoretical lithium storage capacity (4200mAh / g) and lower delithiation potential (<0.5V) of silicon are 10 times higher than the theoretical lithium storage energy of graphite materials (372mAh / g), and the voltage platform of silicon Slightly higher than graphite, it is difficult to cause lithium precipitation on the surface during charging, and the safety performa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 王义飞李新峰任森
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY