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Composite positive electrode material for lithium ion battery and preparation method of composite positive electrode material

A lithium-ion battery and composite anode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of polluting products, high energy consumption, and large internal resistance, and achieve small mixing, low energy consumption, and internal resistance. small resistance effect

Inactive Publication Date: 2018-02-09
江苏奔拓电气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a composite anode material for lithium-ion batteries and its preparation method in view of the problems of large internal resistance, high energy consumption, easy dissolution and polluting products in the currently used anodes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Take 0.5mol of nickel sulfate, 0.2mol of cobalt sulfate, and 0.3mol of manganese sulfate, add them to 500mL of deionized water, stir at 300r / min for 20min under a nitrogen atmosphere, and then dropwise add a 30% sodium carbonate solution at a mass fraction of 1mL / min , add dropwise ammonia water with a mass fraction of 16% at 1mL / min to adjust the pH to 10.5, keep the temperature at 60°C for 10 hours, let it stand for 8 hours and then filter the filter residue, wash the filter residue with deionized water until the washing liquid is neutral, and then transfer to Put it into a drying oven and dry it to a constant weight at 105°C to obtain a precursor. Mix the precursor with 0.55mol lithium carbonate evenly and place it in a muffle furnace. Under an oxygen atmosphere, heat up to 450°C at a rate of 3°C / min. , heat preservation reaction for 5 hours, then heat up to 800 degrees Celsius at 2°C / min, heat preservation reaction for 10 hours, and cool to room temperature to obtain...

example 2

[0023] Take 0.8mol of nickel sulfate, 0.3mol of cobalt sulfate, and 0.5mol of manganese sulfate, add them to 800mL of deionized water, stir at 350r / min for 25min under a nitrogen atmosphere, and then dropwise add a 30% sodium carbonate solution at a mass fraction of 1mL / min , add dropwise ammonia water with a mass fraction of 16% at 1mL / min to adjust the pH to 10.8, keep the temperature at 62°C for 11 hours, let stand for 9 hours and then filter the filter residue, wash the filter residue with deionized water until the washing liquid is neutral, and then transfer to Put it into a drying oven, dry it at 108°C to a constant weight to obtain a precursor, mix the precursor with 0.8mol lithium carbonate evenly, put it in a muffle furnace, and raise the temperature to 500°C at 3°C / min in an oxygen atmosphere , heat preservation reaction for 5 hours, then raise the temperature to 820 degrees Celsius at 2°C / min, heat preservation reaction for 11 hours, and obtain a ternary positive ele...

example 3

[0025] Take 1.0mol of nickel sulfate, 0.4mol of cobalt sulfate, and 0.6mol of manganese sulfate, add them to 1000mL of deionized water, stir at 400r / min for 30min under a nitrogen atmosphere, and then dropwise add a 30% sodium carbonate solution at a mass fraction of 2mL / min , add 16% ammonia water dropwise at 2mL / min to adjust the pH to 11.0, keep the temperature at 65°C for 12 hours, let it stand for 10 hours and then filter the filter residue, wash the filter residue with deionized water until the washing liquid is neutral, and then transfer to Put it into a drying oven and dry it at 110°C until it reaches a constant weight to obtain a precursor. Mix the precursor with 1.1mol lithium carbonate evenly and place it in a muffle furnace. Under an oxygen atmosphere, raise the temperature to 550°C at a rate of 3°C / min. , keep the temperature for 6 hours, then raise the temperature to 850 ℃ at 2 ℃ / min, keep the temperature for 12 hours, cool to room temperature to get the ternary p...

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Abstract

The invention relates to a composite positive electrode material for a lithium ion battery and a preparation method of the composite positive electrode material, and belongs to the technical field ofmaterial processing. According to the preparation method, a precursor is prepared through a sodium carbonate graded coprecipitation method; by combination with subsequent calcining treatment in lithium-mixed oxygen atmosphere, a lithium ion battery spherical ternary positive electrode is obtained, wherein the spherical ternary positive electrode is high in layered structure, low in positive ion mixing arrangement degree, relatively high in spherical shape, and has gradient distribution of Ni and Mn concentration from the centre to the surface; by virtue of relatively low Ni concentration on the surface of the material, the secondary reaction between active Ni<4+> and an electrolyte in a charging state is relieved effectively, so that dissolving of metal ions is lowered and the structural stability of the material is improved, thereby improving the cycle performance of the material; next, through a proper amount of boron doping, the grain diameter of the material is reduced, the transmission rate of lithium ions is improved, and the electron transfer area is enlarged; and in addition, the ion de-intercalation reversibility is improved, the charge transfer impedance is lowered, the lithium ion diffusion coefficient is improved, the internal resistance is low and the energy consumption is low.

Description

technical field [0001] The invention relates to a composite anode material for a lithium ion battery and a preparation method thereof, belonging to the technical field of material processing. Background technique [0002] Lithium-ion batteries are widely used in portable devices such as mobile phones and notebooks due to their advantages such as high voltage, high specific energy of titanium, long cycle life, good safety performance, wide operating temperature range, no memory effect, small self-discharge, and environmental friendliness. , medical equipment, power tools, digital products, etc. In recent years, the application range of lithium-ion batteries has also expanded to some new fields such as new energy transportation (electric vehicles, hybrid vehicles, etc.), smart grids, and new energy (solar, wind) energy storage. The performance of materials puts forward higher requirements. Lithium-ion batteries are composed of positive and negative electrode materials, elect...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 王飞王之霖陈倩
Owner 江苏奔拓电气科技有限公司
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