Preparation of a high-load self-supporting thick electrode and its application in sodium-ion batteries

A sodium ion battery, self-supporting technology, applied in the direction of battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of long sodium ion diffusion path, poor rate performance, slow diffusion, etc., and achieve excellent cycle performance , increase energy density, improve the effect of binding force

Active Publication Date: 2021-04-13
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the loading is increased, since the diffusion path of sodium ions in the electrode is a broken line, the diffusion path of sodium ions is long and slow, and the rate performance is very poor.

Method used

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  • Preparation of a high-load self-supporting thick electrode and its application in sodium-ion batteries
  • Preparation of a high-load self-supporting thick electrode and its application in sodium-ion batteries
  • Preparation of a high-load self-supporting thick electrode and its application in sodium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: (preparation Na 3 V 2 (PO 4 ) 3 @3DFLC-1 self-supporting electrode)

[0037] Weigh 5 g of polyacrylonitrile (organic polymer resin) and add it into 45 g of DMF, and stir for 5 hours until completely dissolved to form a 10% resin solution. Add 10 g of Na to the resin solution 3 V 2 (PO 4 ) 3 (electrode material), stirred for 12 hours, then ultrasonicated for 3 hours, and then stirred for 24 hours to obtain a uniformly dispersed mixed solution. Spread the mixed solution on a glass plate, volatilize for 1mins, set the thickness of the film to 1000μm, and then immerse it in a mixed solution of water and ethanol (1:1 in mass ratio) for 180 minutes, and solidify to form a porous composite membrane. The composite film was pre-calcined at 300 °C for 3 h in an air atmosphere, and then calcined at 800 °C for 4 h in an argon atmosphere to obtain 12 mg cm -2 , 600 μm thick Na 3 V 2 (PO 4 ) 3 @3DFLC-1 self-supporting electrode. The prepared Na 3 V 2 (PO...

Embodiment 2

[0038] Embodiment 2: (preparation Na 3 V 2 (PO 4 ) 3 @3DFLC-2 self-supporting electrode)

[0039] Weigh 5 g of polyacrylonitrile (organic polymer resin) and add it into 45 g of DMF, stir for 6 hours until completely dissolved, and form a 10% resin solution. Add 40 g of Na to the resin solution 3 V 2 (PO 4 ) 3 (electrode material), stirred for 12 hours, then ultrasonicated for 3 hours, and then stirred for 24 hours to obtain a uniformly dispersed mixed solution. Spread the mixed solution on a glass plate, volatilize for 1mins, set the thickness of the film to 1000μm, and then immerse it in a mixed solution of water and ethanol (1:1 in mass ratio) for 180 minutes, and solidify to form a porous composite membrane. The composite film was pre-calcined at 300 °C for 3 h in an air atmosphere, and then calcined at 800 °C for 4 h in an argon atmosphere to obtain 45 mg cm -2 , 600 μm thick Na 3 V 2 (PO 4 ) 3 @3DFLC-2 self-supporting electrode. The battery assembly is the s...

Embodiment 3

[0040] Embodiment 3: (preparation Na 3 V 2 (PO 4 ) 3 @3DFLC-3 self-supporting electrode)

[0041] Weigh 5 g of polyacrylonitrile (organic polymer resin) and add it into 45 g of DMF, stir for 4 hours until completely dissolved, and form a 10% resin solution. Add 10 g of Na to the resin solution 3 V 2 (PO 4 ) 3 (electrode material), stirred for 12 hours, then ultrasonicated for 3 hours, and then stirred for 24 hours to obtain a uniformly dispersed mixed solution. Spread the mixed solution on a glass plate, volatilize for 1mins, set the thickness of the film to 1000μm, and then immerse in the mixed solution of water and ethanol (1:15 in mass ratio) for 180 minutes, and solidify to form a porous composite membrane. The composite film was pre-calcined at 300 °C for 3 h in an air atmosphere, and then calcined at 800 °C for 4 h in an argon atmosphere to obtain 12 mg cm -2 , 600 μm thick Na 3 V 2 (PO 4 ) 3 @3DFLC-3 self-supporting electrodes. The battery assembly is the ...

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Abstract

The invention belongs to the field of electrode materials, and discloses a high-load self-supporting thick electrode prepared by phase inversion, a preparation method and application thereof. The electrode prepared by this process has the following advantages: 1) No current collector, binder and additional conductive carbon are required, which greatly improves the overall energy density of the electrode; 55 mg cm ‑2 , this kind of thick electrode can increase the proportion of active materials in the entire energy storage device, and increase the energy density of the entire energy storage device; 3) Compared with thin electrodes, the preparation steps of high-load thick electrodes are shorter when the same energy storage capacity is achieved. 4) The electrode has micron-scale finger-shaped pores connecting the two electrode surfaces and hundreds of nano-scale pores dispersed throughout the electrode, which ensure that the electrode has excellent performance even under a high load. rate performance. This method will promote the industrial application and large-scale production of high-load self-supporting thick electrodes.

Description

technical field [0001] The invention belongs to the field of electrode materials, and discloses a high-load self-supporting thick electrode prepared by phase inversion, a preparation method and application thereof. Background technique [0002] Energy is an important driving force for social development. The energy currently used is mainly divided into renewable energy (wind energy, water energy, solar energy, etc.) and non-renewable energy (coal, oil, natural gas, etc.). Due to the shortage of non-renewable energy resources and serious environmental pollution, the development of renewable energy has attracted more and more attention. However, renewable energy is discontinuous and unstable, and directly connected to the grid will have a great impact on the grid. Energy storage technology is a key technology to solve the discontinuous and unstable renewable energy. Among many energy storage technologies, lithium-ion batteries have the advantages of high energy density and lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/36H01M4/62H01M4/13H01M10/054
CPCH01M4/13H01M4/139H01M4/366H01M4/625H01M4/628H01M10/054H01M2004/021Y02E60/10
Inventor 郑琼易红明张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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