Hard carbon binder, negative plate containing hard carbon binder and sodium ion battery

A sodium-ion battery and binder technology, which is applied to battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve problems such as easy decomposition, and achieve the effects of low environmental requirements, short process time, and low raw material requirements

Active Publication Date: 2021-06-29
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a hard carbon binder, a negative electrode sheet containing a hard carbon binder, and a sodium ion battery, which can solve the problem that the traditional negative electrode dry-process binder polytetrafluoroethylene (PTFE) is easy to decompose under low pressure

Method used

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  • Hard carbon binder, negative plate containing hard carbon binder and sodium ion battery
  • Hard carbon binder, negative plate containing hard carbon binder and sodium ion battery
  • Hard carbon binder, negative plate containing hard carbon binder and sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1) Preparation of positive pole piece: 95wt% copper iron manganese sodium oxide O3-Na[Cu 0.22 Fe 0.3 Mn 0.48] O 2 Mix with 3wt% acetylene black, use a low-speed mixer to stir at 30r / min for 20min, then add 40% solid content polytetrafluoroethylene (PTFE) emulsion, the addition amount is 2wt%, stir at 30r / min for 2 Hour. Then, the prepared slurry was evenly rolled on an aluminum foil with a thickness of 20 μm, with an areal density of 100 mg / cm 2 , the positive electrode sheet is prepared after drying, slitting and die-cutting.

[0050] 2) Preparation of negative pole piece: 95wt% of anthracite-based hard carbon material and 3wt% of acetylene black were mixed, stirred at a speed of 30r / min for 20min with a low-speed mixer, and then added with 40% solid content of sodium polyacrylate emulsion, and the addition amount was 2 wt %, stirring at 30 r / min for 2 hours. Then, the prepared slurry was evenly rolled on an aluminum foil with a thickness of 20 μm, with an areal ...

Embodiment 2

[0061] 1) The preparation of the positive electrode plate is the same as that of Example 1.

[0062] 2) Preparation of negative pole piece: 95wt% of anthracite-based hard carbon material and 3wt% of acetylene black were mixed, stirred at a speed of 30r / min for 20min with a low-speed mixer, and then added with 40% solid content of PAAS and the monomer acrylic acid on the chain. The ester copolymer was added in an amount of 2 wt %, and the mixture was stirred at a rotational speed of 30 r / min for 2 hours. Then, the prepared slurry was evenly rolled on an aluminum foil with a thickness of 20 μm, with an areal density of 63 mg / cm 2 After drying, slitting and die-cutting, the dry-process negative electrode sheet is prepared.

[0063] 3) 0880138 dry-process sodium ion half-cell was prepared according to the same method as in Example 1 above; the design capacity was 4.5Ah;

[0064] 4) the sodium ion half-cell of gained is baked in the high temperature vacuum box for 24 hours, the l...

Embodiment 3

[0067] 1) The preparation of the positive electrode plate is the same as that of Example 1.

[0068] 2) Preparation of negative pole piece: 95wt% of anthracite-based hard carbon material and 3wt% of acetylene black were mixed, stirred at a speed of 30r / min for 20min using a low-speed mixer, and then added 40% solid content of PAAS and the monomer vinyl acetate on the chain The ester copolymer was added in an amount of 2 wt %, and the mixture was stirred at a rotational speed of 30 r / min for 2 hours. Then, the prepared slurry was evenly rolled on an aluminum foil with a thickness of 20 μm, with an areal density of 63 mg / cm 2 After drying, slitting and die-cutting, the dry-process negative electrode sheet is prepared.

[0069] 3) 0880138 dry-process sodium ion half-cell was prepared according to the same method as in Example 1 above; the design capacity was 4.5Ah;

[0070] 4) the sodium ion half-cell of gained is baked in the high temperature vacuum box for 24 hours, the liqui...

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Abstract

The invention relates to a hard carbon binder, a negative plate containing the hard carbon binder and a sodium ion battery. The hard carbon binder is chain-shaped sodium polyacrylate PAAS or a PAAS copolymer; and the hard carbon binder is used as a sodium ion battery negative electrode binder. The hard carbon binder provided by the invention does not have the problem that the traditional negative electrode dry binder polytetrafluoroethylene (PTFE) is easy to decompose under low pressure, and has the advantages of short process time and low environmental requirements; when the negative electrode material is used for preparing the dry-method sodium ion battery, the advantages of high surface density, simple process and low cost are achieved; and sodium ions in PAAS can migrate in the electrode, so that the electrode has the advantage of supplementing the sodium ions.

Description

technical field [0001] The invention relates to the technical field of sodium ion battery materials, in particular to a hard carbon binder, a negative electrode sheet containing the hard carbon binder, and a sodium ion battery. Background technique [0002] Since the first industrial revolution, human beings have consumed large-scale fossil energy, such as coal, oil, and natural gas. While causing pollution, a large amount of carbon dioxide is released, which directly causes global warming and climate anomalies. Since the beginning of the new century, clean energy such as solar energy, wind energy, and tidal energy has quickly gained popularity due to its advantages of zero pollution and zero emission. However, due to factors such as weather and sunshine, the utilization rate is extremely low; large-scale energy storage technology came into being. [0003] Electrochemical energy storage technology has the advantages of convenience and flexibility, high efficiency, and good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/133H01M10/054
CPCH01M4/622H01M4/13H01M4/133H01M10/054Y02E60/10
Inventor 周权胡勇胜陆雅翔
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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