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Lithium-ion film cell negative pole and preparing method

A thin-film battery and lithium-ion technology, applied in the direction of electrode manufacturing, battery electrodes, active material electrodes, etc., to achieve the effects of reducing production costs, good repeatability, and simplifying operation steps

Inactive Publication Date: 2008-05-28
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there has been no use of electrostatic spray deposition to prepare the anode material XLi for miniature lithium-ion batteries. 2 Report on O·YCoO Thin Film Electrode

Method used

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  • Lithium-ion film cell negative pole and preparing method
  • Lithium-ion film cell negative pole and preparing method
  • Lithium-ion film cell negative pole and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First assemble the electrostatic spray deposition device used in the present invention: put one end of the 0.8 mm inner diameter silicone tube into a 250 ml conical flask containing the precursor solution, connect the other end to a needle with a pinhole inner diameter of 0.4 mm, and then fix the silicone tube In the groove of the flow tube of the peristaltic pump, the positive lead wire clamp of the DC high voltage generator with a control flow range of 0-50ml / h and a voltage range of 0-40000V is connected to the injection needle and keeps the needle tip vertically upward, directly above the needle tip 1 A thermocouple is placed horizontally at -4cm, the temperature control range is 0-800°C, and the negative pole of the DC high voltage generator is connected to the thermocouple.

[0022] Then prepare the precursor solution: then prepare the precursor solution: take 0.0255 grams of LiOAC·2H respectively 2 O and 0.6227 g Co(OAC) 2 .·4H 2 O (that is, the molar ratio of ...

Embodiment 2

[0029] Take 0.0255 g of LiOAC·2H respectively 2 O and 0.6227 g Co(OAC) 2 4H 2 O (i.e. the Li:Co molar ratio is 1:1), stirred and fully dissolved in 50mL carbitol, using the same operation steps as in Example 1, using copper foil as the substrate, heating the substrate to a temperature of 245°C and The electrode film was obtained after being kept at this temperature and deposited for 2 hours, and its performance was tested after being assembled into a battery.

[0030] figure 2 It is the X-ray diffraction spectrogram of the incident copper target of the compound obtained in this example. In the figure, there are three sharp diffraction peaks at 44°, 52° and 75°, which are the diffraction peaks of the substrate, at 36°, 42.5°, There are four broad diffraction peaks around 61.5° and 74°, which are the (111), (200), (220) and (311) planes of CoO, respectively, and the relative intensity ratio of the peaks at 2θ of 42.5° and 36° is 1: 1.53; Know LiOAC 2H by embodiment 1 2 O d...

Embodiment 3

[0035] Take LiOAC·2H respectively 2 O and Co(OAC) 2 4H 2 O: Prepare five solutions with Li:Co ratios of 0.25:1, 0.5:1, 1:1, 2:1 and 4:1, the concentration of Co in each solution is 0.005 mol / L, and the solvent is 50 ml of carbo alcohol. Using the same steps as in Example 1, still choose foamed nickel as the substrate, keep the substrate at a constant temperature of 225 ° C, and deposit it for 2 hours respectively to obtain five chemical compositions of XLi 2 O.YCoO (X=0.125, Y=1), XLi 2 O.YCoO (X=0.25, Y=1), XLi 2 O·YCoO (X=0.5, Y=1), XLi 2 O·YCoO(X=1, Y=1) and XLi 2 The electrode film of O·YCoO (X=2, Y=1), the performance of which was tested after the obtained electrode film was assembled into a battery.

[0036] Figure 7 The capacity of the electrode film prepared for this example at a voltage range of 3.00-0.01 volts and a discharge rate of 1C. When Li:Co is 0.25:1, 0.5:1, 1:1, 2:1 and 4:1, the discharge capacity of the electrode film is 480mAh / g, 550mAh / g, 760mAh...

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Abstract

The method includes steps: mixing lithium acetate and cobalt acetate according to 0.25-4:1 mol ratio, and solving the admixture to carbitol to form solution of precursor body in density of metal positive ion as 0.001-0.02 mol / liter; solution flowed to spray head in 2-4 ml. / hr uniform speed, adjusting interval between spray head and substrate as 1-4 cm, controlling constant temperature 200-300 deg.C for substrate, adjusting DC voltage between spray head and substrate to obtain steady and even spray; obtaining XLi2O .YcoO film of composite oxides in thickness 1-200 micro; film is in 3D mesh structure, and mesh size as 2-30 micro, Li2O and CoO as amorphous phase and crystallite state respectively; 2 theta of characteristic peak of X ray for incidence to copper target as 36, 42.5, 61.5, 74 degrees, and relative intensity ratio of peak as 1:1-1.7 for 2 theta being as 42.5 and 36 degrees. Features are: high first discharge capacity, low first capacity loss and excellent cycle performance.

Description

technical field [0001] The invention belongs to the technical field of preparation methods for thin-film electrodes of miniature lithium-ion batteries, and in particular relates to the preparation of composite oxide miniature lithium-ion battery cathode films composed of cobalt oxide and lithium oxide by electrostatic spray deposition (ESD). Background technique [0002] In recent years, with the emergence of mobile phones, notebook computers and other products, lithium-ion batteries with small volume and high energy density are gradually becoming commercialized and become a research hotspot. Therefore, the preparation of high-performance, low-cost electrodes for thin-film lithium-ion batteries is of great significance for the development of microelectronic devices. [0003] The international patent WO01 / 31720A1 introduces the method of chemical vapor deposition or sputtering to prepare silicon alloy thin film as the negative electrode material of lithium ion battery. The a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/58H01M4/48H01M4/04H01M4/131H01M4/1391H01M4/525
CPCY02E60/12Y02E60/10
Inventor 陈春华余彦
Owner UNIV OF SCI & TECH OF CHINA
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