High-rate lithium ion battery cathode material and preparation method and application thereof

A technology of lithium-ion batteries and positive electrode materials, applied in the field of electrode materials, to achieve the effects of excellent electrochemical performance, easy purchase, and easy large-scale industrial production

Inactive Publication Date: 2015-06-03
GUANGDONG KEPRIME ENERSTORE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrochemical application of the cathode material of the present invention is compatible with the technical requirements of existing lithium-ion batteries and supercapacitors, and solves the high-current charge-discharge rate faced when lithium-ion batteries are used as power batteries and lithium-ion capacitors are used as energy storage devices , capacity, circulation and safety and other technical bottlenecks

Method used

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  • High-rate lithium ion battery cathode material and preparation method and application thereof
  • High-rate lithium ion battery cathode material and preparation method and application thereof
  • High-rate lithium ion battery cathode material and preparation method and application thereof

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preparation example Construction

[0080] A preferred preparation method comprises the steps of:

[0081] The positive electrode material is uniformly mixed with the conductive agent and the binder in the solution (such as nitrogen methyl pyrrolidone (NMP)), and the mass ratio of the suitable positive electrode material, conductive agent and binder is adjusted (such as 80-90:5- 10:5-10, preferably 90:5:5, 80:10:10 or 85:10:5), then coated and pressed on an aluminum foil, dried, and pressed to obtain a positive electrode sheet.

[0082] secondary battery

[0083] The secondary battery provided by the present invention includes a positive electrode material and a negative electrode material, wherein the positive electrode material includes the lithium nickel cobalt manganese oxide solid solution battery positive electrode material of the present invention, and the battery contains the battery positive electrode of the present invention .

[0084] The secondary battery provided by the invention also includes a...

Embodiment 1

[0095] Embodiment 1: Take nickel sulfate, cobalt sulfate, and manganese sulfate according to the molar ratio of nickel, cobalt, and manganese of 0.35:0.33:0.32, add deionized water to fully dissolve and prepare a transparent solution with an ion concentration of 1mol / L, and place it in a water bath constant temperature at 70 0 C, slowly and evenly add sodium hydroxide solution of the same concentration, and stir at the same time, the rotating speed is 600 rpm, until the sodium hydroxide solution is added, the color of the suspension obtained by the reaction will no longer change, stop adding sodium hydroxide, and continue After stirring at a constant speed for more than 30 minutes, the co-precipitation reaction was completed. The reaction suspension was centrifuged to obtain a co-precipitated solid, which was repeatedly washed with deionized water and filtered 4 times, then placed in a blast drying oven, and dried at 120°C for 16 hours to obtain a precursor. After taking it o...

Embodiment 2

[0097] Embodiment 2: Take by weighing nickel nitrate, cobalt nitrate, manganese nitrate according to nickel, cobalt, manganese molar ratio 0.45:0.23:0.32, add deionized water and fully dissolve and prepare the transparent solution that ion concentration is 1mol / L, place in water bath constant temperature at 60 0 C, slowly and evenly add sodium carbonate solution of the same concentration, and stir at the same time, the rotating speed is 1200 rpm, until the sodium carbonate solution is added, the color of the reaction suspension does not change, stop adding sodium carbonate, continue to stir at a constant speed for more than 60 minutes After that, the co-precipitation reaction was ended. The precursor was mixed with LiOH at a molar ratio of 1:1.09. All the other are identical with embodiment 1, and its X-ray diffraction figure (XRD) and SEM figure are similar to Figures 1A-1D .

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Abstract

The invention discloses a lithium nickel cobalt manganese oxide sosoloid material and a preparation method thereof, and application of the lithium nickel cobalt manganese oxide sosoloid material serving as a cathode material of a high-rate and high-capacity secondary battery and a super capacitor. The chemical formula of the material is Li1+sigmaNixCoyMn1-x-yO2, wherein sigma is more than 0.0 and less than or equal to 12, x is more than 0.0 and less than or equal to 0.6, y is more than or equal to 0 and less than 0.5, and 1-x-y is more than 0.0 and less than or equal to 0.5. The invention also discloses a preparation method for the material. The method comprises the following steps of: preparing a precursor by a coprecipitation method; and obtaining the material by two-step solid phase sintering. The invention also discloses the material serving as the cathode material and application of the current lithium ion battery in compatibility with a mixed super capacitor. Compared with the prior art, the lithium nickel cobalt manganese oxide sosoloid material has the advantages that high-rate and high-capacity high charging and discharging cyclic performance is realized, and industrialization is easy to implement; discharging is executed by 1.6A / g(10C) current; a complete charging and discharging cycle is executed for more than 60 times within 2.5 to 4.3V; and the final discharging is 120mAh / g higher than the capacity. The material obtained by the invention can be used in the conventional lithium ion battery market and can be used for power supplies of an electric tool, an electric automobile and an intelligent power grid.

Description

technical field [0001] The invention belongs to the field of electrode materials and electrochemical energy storage, and specifically relates to a lithium nickel cobalt manganese oxide solid solution material and a preparation method thereof, as well as its use as a positive electrode material for high-rate high-capacity secondary batteries and supercapacitors. Background technique [0002] Energy is the engine of the national economy, and the development of new energy determines the autonomy of the future economy. Energy includes fossil energy and clean energy. With fossil energy due to its non-renewability and environmental pollution problems, the utilization of clean energy is currently the most cutting-edge and core global issue. Since clean energy is usually not continuous in production, such as solar energy and wind energy, it is more restricted by region and weather, so energy storage technology is an indispensable key supporting technology in clean energy and its ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01G11/24H01G11/86
CPCH01G11/24H01G11/86Y02E60/13Y02T10/70
Inventor 黎军张丽陈胜友
Owner GUANGDONG KEPRIME ENERSTORE
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