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Negative pole piece for sodium ion battery, preparation method of negative pole piece and sodium ion battery

A technology of sodium ion battery and negative pole piece, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of affecting battery safety performance, low gram capacity of positive and negative electrodes, dendrites, etc. The formation of sodium dendrites, the reduction of overpotential, and the effect of improving cycle performance

Pending Publication Date: 2022-05-20
DALIAN CBAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, the positive electrode materials of sodium ion batteries mainly include Prussian blue, sodium vanadium phosphate, and sodium iron nickel manganate, with a gram capacity between 100 and 160mAh. The gram capacity of the positive and negative electrodes for producing sodium ions is low, so there is always a big gap between sodium-ion batteries and lithium-ion batteries in terms of energy density
[0005] In the case that the positive electrode material and the negative electrode material do not effectively increase the gram capacity, using sodium metal (theoretical specific capacity 1166mAh / g) as the negative electrode becomes an effective choice to increase the energy density of the battery, but sodium metal is prone to defects such as dendrites during charging. Affect battery safety performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment provides a negative electrode sheet for a sodium battery, the preparation method of which is as follows:

[0046] 1. Prepare a melt-blown cloth containing a conductive agent, the thickness of the melt-blown cloth is 2.0 μm, the porosity is 68%, the mass percentage of the conductive agent in the melt-blown cloth is 56%, and the conductive agent is carbon black;

[0047] 2. Soak the above melt-blown cloth in 10% hydrofluoric acid solution for 8 hours;

[0048] 3. In step 2, the melt-blown cloth is washed with deionized water until neutral, and dried in vacuum at 80°C for 8 hours;

[0049] 4. Perform thermal bonding in the order of top, middle and bottom of melt blown cloth, 10μm aluminum foil, and melt blown cloth to form the negative electrode of sodium battery. The thermal bonding temperature is 90°C and the thermal bonding pressure is 2MPa.

[0050] This embodiment also provides a 32140 cylindrical sodium ion battery prepared according to the following...

Embodiment 2

[0061] 1. Prepare a melt-blown cloth containing a conductive agent. The thickness of the melt-blown cloth is 2.5 μm, the porosity is 82%, the mass percentage of the conductive agent in the melt-blown cloth is 80%, and the conductive agent is acetylene black;

[0062] 2. Soak the above melt-blown cloth in 10% hydrofluoric acid solution for 8 hours;

[0063] 3. In step 2, the melt-blown cloth is washed with deionized water until neutral, and dried in vacuum at 80°C for 8 hours;

[0064] 4. Carry out thermal bonding according to the sequence of melt-blown cloth, 8 μm polypropylene non-porous film, and melt-blown cloth to form the negative electrode of sodium battery. The thermal bonding temperature is 70°C and the thermal bonding pressure is 1.8 MPa.

[0065] The battery preparation method is the same as in Example 1.

Embodiment 3

[0067] 1. Prepare a melt-blown cloth containing a conductive agent. The thickness of the melt-blown cloth is 2.3 μm, the porosity is 71%, the mass percentage of the conductive agent in the melt-blown cloth is 32%, and the conductive agent is carbon black;

[0068] 2. Soak the above melt-blown cloth in 10% hydrofluoric acid solution for 8 hours;

[0069] 3. In step 2, the melt-blown cloth is washed with deionized water until neutral, and dried in vacuum at 80°C for 8 hours;

[0070] 4. Carry out thermal bonding according to the sequence of the melt-blown cloth, 8 μm polyethylene non-porous film, and melt-blown cloth to form the negative electrode of the sodium battery. The thermal bonding temperature is 70°C and the thermal bonding pressure is 1.6 MPa.

[0071] The battery preparation method is the same as in Example 1.

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Abstract

The invention relates to the technical field of sodium-ion batteries, in particular to a negative pole piece for a sodium-ion battery, a preparation method of the negative pole piece and the sodium-ion battery. The preparation method of the negative pole piece for the sodium ion battery comprises the following steps: 1) preparing melt-blown cloth, and loading a conductive agent on the melt-blown cloth to obtain the melt-blown cloth containing the conductive agent; 2) soaking the melt-blown cloth containing the conductive agent in a hydrofluoric acid solution, washing with water, and drying to obtain a functional layer; and 3) carrying out thermal bonding according to the sequence of one functional layer, one middle structural layer and the other functional layer. The negative pole piece for the sodium ion battery provided by the invention can effectively inhibit dendritic crystals formed by sodium metal in the circulation process, and improves the cycle performance and the safety performance of the battery.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a negative pole piece for a sodium ion battery, a preparation method thereof, and a sodium ion battery. Background technique [0002] In the 21st century, lithium batteries are used in many fields such as mobile phones, computers, wearable devices, electric vehicles, two-wheeled bicycles, electric tools, and street lamps. With the increasing use of lithium batteries, the consumption of lithium resources is increasing and the consumption rate is faster. The increase in lithium production cannot meet the increase in consumption. This is because first, lithium resources are Limited, mainly in the state of spodumene ore and salt lake lithium. Second, lithium cannot be extracted from salt lake lithium in winter, which has caused the price of lithium metal and its compounds to skyrocket this year. [0003] In contrast, sodium has a wide range of sources and abundant reser...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M10/054H01M4/13
CPCH01M4/13H01M4/139H01M10/054H01M2004/021Y02E60/10
Inventor 王元杰薄晋科田秀君曹仕良
Owner DALIAN CBAK POWER BATTERY CO LTD