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Method for preparing water-based lithium cobaltate electrode plate from water soluble adhesive sodium alginate

A water-based lithium cobaltate and sodium alginate technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problem of low battery rate performance, achieve good electrochemical stability, good adhesive strength, and improve cycle stability Effect

Inactive Publication Date: 2018-02-23
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Water-soluble sodium alginate binder for high-voltage and high-energy aqueous LiCoO 2 The preparation of electrode sheets, the electrode has better electrochemical performance at high voltage than PVDF as the binder, however, the rate performance of the battery is still low, and one of the key challenges is to determine the best strategy to develop high-quality loaded electrodes , does not affect the cycle ability and rate performance of the battery

Method used

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  • Method for preparing water-based lithium cobaltate electrode plate from water soluble adhesive sodium alginate
  • Method for preparing water-based lithium cobaltate electrode plate from water soluble adhesive sodium alginate
  • Method for preparing water-based lithium cobaltate electrode plate from water soluble adhesive sodium alginate

Examples

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Effect test

Embodiment 1

[0021] (1) Prepare a sodium alginate (SA) aqueous dispersion with a mass fraction of 2 wt%. First, weigh 2.744g of deionized water according to the calculation, add 0.056g of sodium alginate (SA) powder under stirring, and stir for about 2 hours until it is completely dissolved.

[0022] (2) Accurately weigh 3.16g of lithium cobalt oxide (LCO) and 0.05g of conductive carbon black (CB) in a mortar, grind them thoroughly to make them evenly mixed.

[0023] (3) Accurately weigh the above ground mixture, pour it into a beaker, and stir for 6 hours.

[0024] (4) Coat the above-mentioned uniformly stirred material on aluminum foil to form a film with a thickness of 100 μm, and then place it in a vacuum drying oven at 120°C for 12 h to obtain the code-named SA1 electrode. After rolling with a roller press, the circular electrode sheet with a diameter of 15 mm was made by pressing the sheet. The mass of the electrode sheet was accurately weighed with an analytical balance and the dat...

Embodiment 2

[0026] (1) Prepare a sodium alginate (SA) aqueous dispersion with a mass fraction of 2 wt%. First, weigh 1.96g of deionized water according to the calculation, add 0.04g of sodium alginate (SA) powder under stirring, and stir for about 2 hours until it is completely dissolved.

[0027] (2) Accurately weigh 1.62g of lithium cobaltate (LCO) and 0.153g of conductive carbon black (CB) in a mortar, grind them thoroughly to mix them evenly.

[0028] (3) Accurately weigh the above ground mixture, pour it into a beaker, and stir for 6 hours.

[0029] (4) Coat the above-mentioned uniformly stirred materials on aluminum foil to form a film with a thickness of 100 μm, and then place it in a vacuum drying oven at 120 °C for 12 h to obtain a code-named SA2 electrode. After rolling with a roller press, the circular electrode sheet with a diameter of 15 mm was made by pressing the sheet. The mass of the electrode sheet was accurately weighed with an analytical balance and the data was recor...

Embodiment 3

[0031] (1) Prepare a sodium alginate (SA) aqueous dispersion with a mass fraction of 2 wt%. First, weigh 2.45g of deionized water according to the calculation, add 0.05g of sodium alginate (SA) powder under stirring, and stir for about 2 hours until it is completely dissolved.

[0032] (2) Accurately weigh 1.62g of lithium cobaltate (LCO) and 0.153g of conductive carbon black (CB) in a mortar, grind them thoroughly to mix them evenly.

[0033](3) Accurately weigh the above ground mixture, pour it into a beaker, and stir for 6 hours.

[0034] (4) Coat the above-mentioned uniformly stirred materials on aluminum foil to form a film with a thickness of 100 μm, and then place it in a vacuum drying oven at 120 °C for 12 h to obtain a code-named SA3 electrode. After rolling with a roller press, the circular electrode sheet with a diameter of 15 mm was made by pressing the sheet. The mass of the electrode sheet was accurately weighed with an analytical balance and the data was record...

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Abstract

The invention discloses a method for preparing a water-based lithium cobaltate electrode plate from water soluble adhesive sodium alginate. The method particularly comprises the following steps: (A) preparing the following raw materials in percentage by weight: 88%-91% of lithium cobaltate, 1%-4% of adhesive sodium alginate and 8%-9% of conductive carbon black; (B) preparing mixed slurry accordingto a formula, grinding, and stirring for uniform mixing, wherein a solvent adopted in the mixed slurry is deionized water, and the concentration range of a prepared adhesive concentration is about 2%; and (C) uniformly coating an aluminum foil with the prepared slurry in a film formation thickness of 50-150 microns, drying, and carrying out rolling and slicing, so as to obtain the water soluble lithium cobaltate electrode plate. The prepared water-based lithium cobaltate electrode plate has relatively good cycling stability and rate capability under a voltage of 4.5V when the proportion is 64.75 to 6.1 to 1.6; and when the voltage is 4.5V, the volume of a lithium cobaltate electrode plate prepared from PVCF under 10C is 4.1mAh / g, and the volume of a lithium cobaltate electrode plate prepared from SA reaches 125.2mAh / g.

Description

technical field [0001] The invention relates to a method for preparing a water-based lithium cobaltate electrode sheet, in particular to a method for preparing a water-based lithium cobaltate electrode sheet by using a water-soluble adhesive sodium alginate. Background technique [0002] With the development of electronic equipment faster and faster, toward the direction of high performance and light weight, the energy density of lithium-ion batteries is also required to be higher and higher, so high-voltage lithium-ion batteries are being extensively studied. And for a long time LiCoO 2 It is a lithium-ion cathode material that has attracted much attention because of its high capacity, good cycle stability and easy preparation. Compared with other materials, LiCoO 2 It also has a larger tap density. LiCoO 2 Performance improvement has also been studied, theoretically, by improving the LiCoO 2 The charging potential can further improve its capacity and energy density. L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/1391H01M4/364H01M4/525H01M4/621H01M10/0525Y02E60/10
Inventor 高媛瑞施利毅刘洪江张登松
Owner SHANGHAI UNIV
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