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Modified lithium ion battery positive electrode material coated with strong electronegative organic matter layer and preparation method of material

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of battery cycle performance not being greatly improved, and the lattice shedding of active materials, so as to suppress side reactions and cycle The effect of improved performance and improved stability

Active Publication Date: 2020-05-29
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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  • Modified lithium ion battery positive electrode material coated with strong electronegative organic matter layer and preparation method of material
  • Modified lithium ion battery positive electrode material coated with strong electronegative organic matter layer and preparation method of material
  • Modified lithium ion battery positive electrode material coated with strong electronegative organic matter layer and preparation method of material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0024] Accurately weigh 0.1 g of ethylene glycol methacrylate acetoacetate, LiNi 0.6 co 0.2 mn 0.2 o 2 Dissolve 5g in 25ml of anhydrous acetonitrile, stir at 60°C for 1h in an argon protective atmosphere, add 0.001g of azobisisobutyronitrile initiator to the mixture, continue to stir at 60°C for 4h, use a rotary evaporator The organic-coated powder was collected and vacuum-dried for 12 hours to obtain a sample with a coating amount of 2 wt%.

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

Embodiment example 2

[0032] Accurately weigh 0.15 g of 2-cyanoethyl acrylate, LiNi 0.6 co 0.2 mn 0.2 o 2 Dissolve 5g, 0.001 azobisisobutyronitrile in 25ml of anhydrous acetonitrile, stir at 60°C for 1 hour in an argon protective atmosphere, add 0.001 azobisisobutyronitrile initiator to the mixture, and continue stirring at 60°C for 4 hours Finally, the organic-coated powder was collected by a rotary evaporator, dried in vacuum for 12 hours, and a sample with a coating amount of 3 wt % was obtained.

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

Embodiment example 3

[0036] Accurately weigh 0.15g of acrylonitrile, LiNi 0.6 co 0.2 mn 0.2 o 2 Dissolve 5g in 25ml of tetrahydrofuran, stir at 60°C for 1h in an argon protective atmosphere, add 0.001g of azobisisobutyronitrile initiator to the mixture, continue to stir at 60°C for 4h, and collect with a rotary evaporator The organic-coated powder was vacuum-dried for 12 hours to obtain a sample with a coating amount of 3 wt%.

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

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Abstract

The invention relates to a modified lithium ion battery positive electrode material coated with a strong electronegative organic matter layer and a preparation method of the material and belongs to the technical field of high-performance battery development. The lithium ion battery positive electrode material is coated with an organic chelating material; ligands on the organic chelating material are in contact with the surface of the positive electrode material; the organic chelating material is prepared by polymerizing at least one of acetoacetic acid ethylene glycol methacrylate, acrylic acid-2-cyanoethyl ester, 4-vinylpyridine, N-vinylformamide, cyanoethyl methacrylate and N-isopropylacrylamide. The preparation method of the positive electrode material comprises the following steps that: an organic chelating material monomer and lithium ion battery positive electrode material powder which are taken according to designed components are put into liquid and are uniformly mixed; polymerization reaction and / or condensation reaction are / is carried out on an obtained mixture; and drying treatment is performed, so that the modified lithium ion battery positive electrode material coatedwith the strong electronegative organic matter layer can be obtained. The battery material is reasonable in component design and simple and controllable in preparation process. The obtained product isexcellent in performance; and the large-scale industrial application of the battery material is facilitated.

Description

technical field [0001] 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. 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 increase the energy density and power density of lithium-ion batteries, such as lithium nickel manganese oxide, lithium cobalt oxide, lithium manganese oxide, and lithium-rich manganese-based cathode materials. However, under high voltage, serious side reactions will occur between the electrolyte and the surface of the positive electrode material, and the dissolution rate of transition metal ions inside the positive...

Claims

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Application Information

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Patent Type & Authority Applications(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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