A kind of cathode material of modified lithium ion battery coated with strong electronegative organic layer and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of battery cycle performance not being greatly improved, active material lattice falling off, etc., to achieve suppression of side reactions, cycle Performance improvement and conductivity improvement effect

Active Publication Date: 2022-06-24
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under high temperature and high voltage, the carbon material or inorganic material coating layer will fall off due to the excessive volume expansion and contraction of the active material lattice, and the dissolution of the positive electrode active material in the electrolyte is still serious. The protection of transition metal ion dissolution and deposition and the structural transformation of positive electrode active materials cannot be realized at the same time, and the battery cycle performance has not been greatly improved.

Method used

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  • A kind of cathode material of modified lithium ion battery coated with strong electronegative organic layer and preparation method thereof
  • A kind of cathode material of modified lithium ion battery coated with strong electronegative organic layer and preparation method thereof
  • A kind of cathode material of modified lithium ion battery coated with strong electronegative organic layer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment example 1

[0024] Accurately weigh 0.1 g of acetoacetate ethylene glycol methacrylate, LiNi 0.6 Co 0.2 Mn 0.2 O 2 5g was dissolved in 25ml of anhydrous acetonitrile, stirred for 1 hour at 60°C under an argon protective atmosphere, 0.001g of azobisisobutyronitrile initiator was added to the mixture, and the mixture was stirred at 60°C for 4 hours, using a rotary evaporator. The organically coated powder was collected and dried under vacuum for 12 h to obtain a sample with a coating amount of 2 wt%.

[0025] Weigh 0.16g of the obtained sample and raw material, respectively mix with 0.02g of conductive carbon black and 0.02g of PVDF, mix in a planetary mixer for 6min, add 500μLNMP, and prepare a slurry with a certain viscosity. Coat the prepared slurry on aluminum foil, dry it in a vacuum oven at 80°C, and use a hole puncher to make an electrode sheet with a diameter of 12 mm. LiTFSI / LiBOB / LiPF 6 , its molar ratio is 6:4:0.05 (the solvent is EC / EMC, its mass ratio is 4:6) and the elect...

Embodiment example 2

[0032] Accurately weigh 0.15 g of acrylic acid-2-cyanoethyl ester, LiNi 0.6 Co 0.2 Mn 0.2 O 2 5g and 0.001 azobisisobutyronitrile were dissolved in 25ml of anhydrous acetonitrile, and after stirring for 1 h at 60°C under an argon protective atmosphere, 0.001 azobisisobutyronitrile initiator was added to the mixture, and the stirring was continued for 4h at 60°C. After that, the organically coated powder was collected by a rotary evaporator, and dried in vacuum for 12 h to obtain a sample with a coating amount of 3 wt%.

[0033] Weigh 0.16g of the obtained sample and raw material, respectively mix with 0.02g of conductive carbon black and 0.02g of PVDF, mix in a planetary mixer for 6min, add 500μLNMP, and prepare a slurry with a certain viscosity. Coat the prepared slurry on aluminum foil, dry it in a vacuum oven at 80 °C, and use a punch to make an electrode sheet with a diameter of 12 mm, with 1 mol / L LiPF 6 (The solvent is EC / EMC, and its mass ratio is 3:7) The electrol...

Embodiment example 3

[0036] Accurately weigh 0.15g of acrylonitrile, LiNi 0.6 Co 0.2 Mn 0.2 O 2 5g was dissolved in 25ml of tetrahydrofuran, stirred for 1 hour at 60°C under an argon protective atmosphere, added 0.001g of azobisisobutyronitrile initiator to the mixture, continued to stir at 60°C for 4 hours, and collected by rotary evaporator The organically coated powder was vacuum-dried for 12 h to obtain a sample with a coating amount of 3 wt%.

[0037] Weigh 0.16g of the obtained sample and raw material, respectively mix with 0.02g of conductive carbon black and 0.02g of PVDF, mix in a planetary mixer for 6min, add 500μLNMP, and prepare a slurry with a certain viscosity. Coat the prepared slurry on aluminum foil, dry it in a vacuum oven at 80 °C, and use a punch to make an electrode sheet with a diameter of 12 mm, with 1 mol / L LiPF 6 (The solvent is EC / EMC, and its mass ratio is 3:7) The electrolyte solution as the electrolyte is assembled into a 2016 button battery, and the charge-discha...

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Abstract

The invention relates to a modified lithium-ion battery anode material coated with a strong electronegative organic layer and a preparation method thereof, belonging to the technical field of high-performance battery development. The positive electrode material of the lithium ion battery is coated with an organic chelating material; and the ligand on the organic chelating material is in contact with the surface of the positive electrode material; the organic chelating material is composed of ethylene glycol methacrylate acetoacetate, ‑2‑cyanoethyl ester, 4‑vinylpyridine, N‑vinylformamide, cyanoethyl methacrylate, and N‑isopropylacrylamide are polymerized. The preparation method is as follows: after the monomer of the organic chelating material and the positive electrode material powder of the lithium ion battery are placed in the liquid and mixed evenly, after the polymerization reaction and / or condensation reaction, after drying treatment, the packaged Coated with a strong electronegative organic layer to modify the positive electrode material of lithium-ion batteries. The battery material components of the invention are reasonably designed, the preparation process is simple and controllable, the product obtained has excellent performance, and is convenient for large-scale industrial application.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery modified by a layer of strongly electronegative organic matter and a preparation method thereof, and belongs to the technical field of high-performance battery development. Background technique [0002] Lithium-ion batteries have become the most promising and potential energy storage medium due to their high energy density, high operating voltage, long cycle life, and environmental friendliness. At present, the development of new high-voltage cathode materials is an effective means to improve the energy density and power density of lithium-ion batteries, such as lithium nickel manganese oxide, lithium cobalt oxide, lithium manganate, lithium-rich manganese-based cathode materials, etc. However, at high voltage, serious side reactions will occur between the electrolyte and the surface of the positive electrode material, the dissolution rate of transition metal ions inside th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/62H01M4/624H01M4/628H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 韦伟峰陈敏健马骋
Owner CENT SOUTH UNIV
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