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Method for processing anode material and battery with anode material processed by the method

A technology of positive electrode materials and processing methods, applied in battery electrodes, chemical instruments and methods, chemical/physical/physicochemical processes, etc., can solve problems affecting material performance, difficulty in preparing electrode slurry, etc., to improve cycle performance, improve Foiling ability and conductivity, effect of eliminating agglomeration

Inactive Publication Date: 2009-01-28
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the commonly used lithium cobalt oxide, after the above-mentioned modification treatment, the specific surface area of ​​the iron-based phosphate cathode material is increased to several tens of times that of lithium cobalt oxide, and the tap density is less than that of lithium cobalt oxide. One-half, and the material contains organic residues, which brings difficulties to the preparation of the electrode slurry. At the same time, the existence of organic residues also affects the performance of the material. Solving the above-mentioned problems caused by material modification has become such a Important direction of material research

Method used

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  • Method for processing anode material and battery with anode material processed by the method
  • Method for processing anode material and battery with anode material processed by the method
  • Method for processing anode material and battery with anode material processed by the method

Examples

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Embodiment 1

[0034] Wash the lithium iron phosphate positive electrode material with an acetone solution containing a surfactant (polyvinyl alcohol) at 20°C for 5 minutes, accompanied by stirring at 200 rpm during washing, and separate the organic residue floating on the surface after settling and carry out Solid-liquid separation, and then drying the separated positive electrode material at 80° C. for 4 hours. The SEM image of the washed lithium iron phosphate positive electrode material and the SEM image of the unwashed lithium iron phosphate are as follows figure 1 with figure 2 shown. It can be seen from the figure that the unwashed lithium iron phosphate cathode material is clustered, and after being washed with polyvinyl alcohol and acetone, the dispersion performance of the material is significantly improved.

Embodiment 2

[0036] Dissolve ethanol in deionized water, add polyvinylpyrrolidone as a surfactant, and use this solution to wash and treat lithium iron phosphate and lithium vanadium phosphate derivative positive electrode materials for 40 minutes at a temperature of 30 ° C. During washing, it is accompanied by 200 rpm. Separate the organic residue floating on the surface after settling, and carry out solid-liquid separation. The separated positive electrode material was dried at 100° C. for 16 hours.

[0037] After drying, the positive electrode material derived from lithium iron phosphate and lithium vanadium phosphate is mixed with Super P, PVDF, NMP, etc. to form a positive electrode slurry with a viscosity of 4000±400mPa·s, and the density is 285g / m 2 The area density is coated, and the coated sheet is dried according to 1.80g / cm 3 The compaction density is rolled into a positive electrode sheet. Then graphite, conductive agent, CMC, SBR, industrial pure water, etc. are prepared int...

Embodiment 3

[0041] Dissolve n-propanol in industrially pure water, add sodium dodecylsulfonate as a surfactant, and use this solution to wash and treat the lithium manganate positive electrode material for 2 hours at a temperature of 65°C, with 200 rpm Separate the organic residue floating on the surface after settling, and carry out solid-liquid separation. The separated positive electrode material was dried at 120° C. for 6 hours. The dried lithium manganate cathode material is mixed with Super P, PVDF, NMP, etc. to form a cathode slurry with a viscosity of 4000mPa s, and the viscosity is 320g / m 2 The area density is coated, and the coated sheet is dried according to 1.90g / cm 3 The compaction density is rolled into a positive electrode sheet. The dry lithium manganate positive electrode material that has not been washed is replaced by the dry lithium manganate positive electrode material treated by the method of the present invention in this embodiment, and the positive electrode shee...

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Abstract

The invention discloses a method for treating cathode materials, and is suitable for treating the cathode materials which are subjected to modifying treatment to improve the property of the materials. The method comprises the following processes: a. the cathode materials are subjected to washing treatment, washing media for washing and treating comprise a washing medium containing a surface active agent. The invention also discloses a battery for treating the cathode materials by the method, the cathode materials for the battery are subjected to modifying treatment, and washing treatment through the washing medium with the surface active agent, and the cathode materials after the washing treatment are separated from the washing medium. The method eliminates the glomeration among particles of the cathode materials, thereby improving the foil-cladding capability and the electric conductivity of the materials. When the materials treated by the method are used to manufacture positive plates, the bonding between the cathode materials and a current collector is better, and the cathode materials are distributed uniformly, thereby the battery of the invention has higher gram specific capacity to exert and higher cycle performance.

Description

technical field [0001] The invention relates to a method for treating positive electrode materials of batteries, in particular to a method for processing modified positive electrode materials to further improve material properties. Background technique [0002] Lithium-ion battery is a high-capacity, high-power battery, which is mainly used in small devices, especially mobile phones, laptop computers, and portable power tools. Lithium-ion batteries are generally composed of battery cover components, battery casings, electrolytes, and battery cells wound by positive and negative electrodes and separator paper. Wherein the positive electrode sheet is coated with a positive electrode active material, and the negative electrode sheet is coated with a negative electrode active material. The properties of positive and negative active materials are crucial to the quality of lithium-ion batteries. [0003] In recent years, gratifying achievements have been made in the research and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58B01J19/00C01B25/45
CPCY02E60/10
Inventor 唐红辉王晋玉王驰伟万华平
Owner SHENZHEN BAK BATTERY CO LTD
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