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Preparation method for ternary positive electrode material of graphene composite lithium ion battery

A lithium-ion battery and graphene composite technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of reducing the volumetric energy density of lithium-ion batteries, large amount of composite graphene, and poor batch stability. Realize the effects of high current rate discharge, high energy density and reduced dosage

Active Publication Date: 2014-11-19
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ternary material is synthesized by the traditional high-temperature solid-state method, which has high energy consumption, long preparation time, poor batch stability, low gram capacity, and short cycle life.
In addition, the patented composite graphene uses a large amount, which will reduce the volumetric energy density of the lithium-ion battery and increase the cost

Method used

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  • Preparation method for ternary positive electrode material of graphene composite lithium ion battery
  • Preparation method for ternary positive electrode material of graphene composite lithium ion battery
  • Preparation method for ternary positive electrode material of graphene composite lithium ion battery

Examples

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Embodiment 1

[0032] Preparation process of graphene composite lithium-ion battery ternary cathode material:

[0033] (1) Preparation of ternary cathode material precursor by controlled crystallization-co-precipitation method

[0034] Prepare a mixed aqueous solution of nickel sulfate, manganese sulfate and cobalt sulfate. The total concentration of nickel, manganese and cobalt ions is 2.5 mol / L, wherein the molar ratio of nickel, manganese and cobalt is 0.50:0.30:0.20, and an aqueous sodium hydroxide solution is prepared with a concentration of 8.0 mol / L L, the concentration of the configured ammonia water is 4.0 mol / L, the above-mentioned nickel-manganese-cobalt mixed brine solution, sodium hydroxide, and ammonia water are respectively added to the reactor with 10 L of primer in parallel flow with 3 metering pumps, and the reactor The volume is 20 L, the base liquid is deionized water, adjust the flow rate of the mixed salt solution, sodium hydroxide and ammonia water, control the content...

Embodiment 2

[0047] Preparation process of graphene composite lithium-ion battery ternary cathode material:

[0048] (1) Preparation of ternary cathode material precursor by controlled crystallization-co-precipitation method

[0049] Prepare a mixed aqueous solution of nickel nitrate, manganese nitrate and cobalt nitrate, the total concentration of nickel-manganese-cobalt ions is 3.0 mol / L, wherein the molar ratio of nickel-manganese-cobalt is 0.40:0.40:0.20, and an aqueous solution of sodium bicarbonate is prepared with a concentration of 1.5 mol / L L, configure the mixed aqueous solution of ammonia water and disodium edetate, wherein the concentration of ammonia water is 1.8 mol / L, the concentration of disodium edetate is 0.2 mol / L, the above-mentioned nickel-manganese-cobalt mixed solution, bicarbonate Sodium, ammonia water and disodium ethylenediaminetetraacetic acid mixed solution were respectively fed into a reaction kettle with 10 L of primer liquid in parallel by three metering pump...

Embodiment 3

[0055] Preparation process of graphene composite lithium-ion battery ternary cathode material:

[0056] (1) Preparation of ternary cathode material precursor by controlled crystallization-co-precipitation method

[0057] Prepare a mixed aqueous solution of nickel acetate, manganese acetate and cobalt acetate. The total concentration of nickel, manganese and cobalt ions is 1.5 mol / L, and the molar ratio of nickel, manganese and cobalt is 0.80:0.10:0.10. Lithium hydroxide aqueous solution is prepared with a concentration of 4.0 mol / L L, configure a mixed aqueous solution of ammonia water and citric acid, wherein the concentration of ammonia water is 2.5 mol / L, and the concentration of citric acid is 0.3 mol / L. 3 metering pumps are added in parallel to the reactor with 10 L of primer solution, the volume of the reactor is 20 L, the primer solution is deionized water, and the mixed solution of mixed salt solution, lithium hydroxide, ammonia water and citric acid is adjusted. Flow...

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Abstract

The invention particularly relates to a preparation method for a ternary positive electrode material of a graphene composite lithium ion battery. The preparation method comprises the following steps of firstly preparing a ternary positive electrode material precursor by a crystallization control-coprecipitation method; performing multi-step sintering to prepare the ternary positive electrode material, wherein the mole ratio of nickel to manganese to cobalt (namely x to y to z) is equal to (0.30-0.90) to (0.50-0.80) to (0.05-0.50), and x+y+z=1; and finally preparing the ternary positive electrode material of the graphene composite lithium ion battery. According to the preparation method disclosed by the invention, the problem that graphene is difficult to disperse in the ternary positive electrode material is solved, the internal polarization resistance is greatly reduced, and high-current rate discharge is realized; furthermore, high discharge capacity and long cycle life are kept. The technology is simple, and the preparation method is low in energy consumption and favorable for large-scale production.

Description

(1) Technical field [0001] The invention relates to the field of lithium ion secondary batteries, in particular to a preparation method of a graphene composite lithium ion battery ternary positive electrode material. (2) Background technology [0002] Throughout the world, problems such as energy crisis, environmental pollution, and climate warming are becoming more and more prominent, which urgently requires us to develop green new energy, such as solar energy, wind energy, geothermal energy, nuclear energy, tidal energy, and long-life secondary batteries. At present, the hot new energy electric vehicles mainly use lithium-ion secondary batteries. Compared with traditional lead-acid and nickel-metal hydride batteries, they have the advantages of light weight, green environmental protection, long life, large capacity and high safety. [0003] Commercial cathode materials for lithium-ion secondary batteries mainly include lithium cobaltate, lithium manganate, lithium iron pho...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 宋春华王胜伟王瑛赵成龙陈欣王新鹏曾怀政杨伟
Owner SHANDONG YUHUANG NEW ENERGY TECH
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