A kind of positive electrode material and preparation method thereof, positive electrode coating material and lithium ion battery

A technology for lithium ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of low utilization rate of materials, complicated preparation process, serious material agglomeration, etc. The effect of embedding, simple preparation method and good cycle performance

Active Publication Date: 2018-02-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of this method is complicated, the material agglomeration is serious, the energy consumption is high, and the obtained NH 4 FeF 4 Orthorhombic positive electrode materials have a small specific surface area and low material utilization

Method used

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  • A kind of positive electrode material and preparation method thereof, positive electrode coating material and lithium ion battery
  • A kind of positive electrode material and preparation method thereof, positive electrode coating material and lithium ion battery
  • A kind of positive electrode material and preparation method thereof, positive electrode coating material and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] (1) According to the amount of substance ratio n(Fe 3+ ):n(F - )=1:4 Weigh 2.8280g Fe(NO 3 ) 3 ﹒ 9H 2 O, 0.7986gNH 4 HF 2 Add 70ml of absolute ethanol to a polytetrafluoroethylene beaker, and stir at room temperature at 500rpm for 12h until the solution turns milky white.

[0070] (2) Transfer the above-mentioned milky white solution to a 100ml polytetrafluoroethylene reaction liner, put it into a steel jacket of a hydrothermal kettle for sealing, and then put it in an oven for solvothermal reaction at 100°C for 12h.

[0071] (3) After cooling down to room temperature, the precipitate in the reactor was vacuum filtered, washed with absolute ethanol, and then dried to obtain the positive electrode material powder, which was designated as I1.

[0072] Carry out X-ray powder diffraction test to the cathode material powder that embodiment 1 prepares, and XRD collection of patterns is as follows figure 1 shown, compared to NH 4 FeF 4 The standard card shows that th...

Embodiment 2

[0075] (1) According to the amount of substance ratio n(Fe 3+ ):n(F - )=1:3.9 Weigh 2.8280g Fe(NO 3 ) 3 ﹒ 9H 2 O, 0.7786g NH 4 HF 2 Add 65ml of absolute ethanol to a polytetrafluoroethylene beaker, and stir at 600rpm at room temperature for 10h until the solution turns milky white.

[0076] (2) Transfer the above-mentioned milky white solution to a 100ml polytetrafluoroethylene reaction liner, put it into a steel sleeve of a hydrothermal kettle for sealing, and then put it in an oven for solvothermal reaction at 120°C for 13h.

[0077] (3) After cooling down to room temperature, the precipitate in the reaction kettle was vacuum filtered, washed with absolute ethanol, and then dried to obtain the positive electrode material powder, which was denoted as I2.

[0078] Carry out X-ray powder diffraction test to the cathode material powder that embodiment 2 prepares, obtain and figure 1 The same XRD pattern.

Embodiment 3

[0080] (1) According to the amount of substance ratio n(Fe 3+ ):n(F - )=1:4.1 Weigh 2.164g FeCl respectively 3 ·6H 2 O, 1.2136gNH 4 F Add 70ml of absolute ethanol to a polytetrafluoroethylene beaker, stir at 400rpm at room temperature for 14h until the solution turns milky white.

[0081] (2) Transfer the above-mentioned milky white solution to a 100ml polytetrafluoroethylene reaction liner, put it into a steel jacket of a hydrothermal kettle for sealing, and then put it in an oven for solvothermal reaction at 140°C for 11 hours.

[0082] (3) After cooling down to room temperature, centrifuge the precipitate in the reaction kettle at a speed of 4000 rpm, wash with absolute ethanol, and then dry the precipitate to obtain the positive electrode material powder, which is denoted as I3.

[0083] Carry out X-ray powder diffraction test to the cathode material powder that embodiment 3 prepares, obtain and figure 1 The same XRD pattern.

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Abstract

The invention relates to the field of battery materials, in particular to a cathode material, a preparation method thereof, a positive coating material prepared from the cathode material, and a lithium ion battery containing the positive coating material. The cathode material is NH4FeF4, and the microstructure is a hollow microsphere with opening, the spherical shell of the hollow microsphere is composed of NH4FeF4 nanoparticles with a particle size of 40-300nm. The cathode material provided by the invention has an open type hollow microsphere structure and large specific surface area, is conducive to rapid disembedding of lithium ions in the material, realizes high capacity and high rate charge-discharge of the battery, and improves the cycle stability of the battery.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a positive electrode material, a preparation method of the positive electrode material, a positive electrode coating material prepared from the positive electrode material, and a lithium ion battery containing the positive electrode coating material. Background technique [0002] Traditional fossil energy sources such as coal, oil, and natural gas are becoming increasingly depleted and causing significant environmental pollution. In the 21st century, energy crisis and environmental pollution have become the main problems facing human beings. Vigorously developing and efficiently utilizing renewable clean energy such as wind energy, solar energy, tidal energy, nuclear energy, and geothermal energy has become the most effective way to solve the above two problems. As a carrier of energy storage and conversion, secondary batteries hold the hope of changing the energy structure and r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCC01G49/009C01P2002/72C01P2004/03C01P2004/34C01P2004/61C01P2006/12H01M4/582H01M10/0525Y02E60/10
Inventor 吴川陈光海吴锋白莹
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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