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Preparation method of high-capacity, fast charge-discharge lithium-ion battery ternary cathode material

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problem that the cathode materials of ternary nickel-cobalt lithium manganese oxide lithium-ion batteries cannot be quickly charged. Putting down and other problems, to achieve the effect of low manufacturing cost, high tap density and good cycle performance

Active Publication Date: 2017-02-01
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention aims to solve the technical problem that the positive electrode material of the ternary nickel-cobalt lithium manganate lithium ion battery prepared by the existing preparation method cannot realize fast charging and discharging and cannot meet the market demand, and provides a high-capacity, fast charging and discharging lithium ion battery. Preparation method of battery ternary cathode material

Method used

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  • Preparation method of high-capacity, fast charge-discharge lithium-ion battery ternary cathode material
  • Preparation method of high-capacity, fast charge-discharge lithium-ion battery ternary cathode material
  • Preparation method of high-capacity, fast charge-discharge lithium-ion battery ternary cathode material

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Embodiment 1

[0038] Weigh nickel sulfate, cobalt sulfate, and manganese sulfate respectively in a molar ratio of 6:2:2, and dissolve them in deionized water to prepare a total concentration of 2mol / L, pass an inert gas to remove oxygen for 30 minutes; prepare 4mol / L sodium carbonate as a precipitate Agent, 2mol / L ammonia water as complexing agent, through N 2 Remove oxygen for 40 minutes; prepare a 2mol / L ammonia solution as the bottom liquid and first add it to the reaction kettle, and pass N at the same time 2As a protective gas, under mechanical stirring, the nickel-cobalt-manganese salt solution is added to the reaction kettle at a rate of 2L / h by means of a metering pump, and the mixed solution of the precipitant and complexing agent is added dropwise, and the reaction system is precisely controlled The pH value is 8.0, the reaction temperature is 50°C, and the stirring speed is 500r / min. Co-precipitation reaction is carried out, and finally a brownish-yellow solid-liquid mixture is o...

Embodiment 2

[0047] Weigh nickel chloride, cobalt chloride, and manganese chloride respectively in a molar ratio of 6:2:2, and dissolve them in deionized water to prepare a total concentration of 1.5mol / L, and pass an inert gas to remove oxygen for 60 minutes; prepare 4mol / L L sodium hydroxide is used as precipitating agent, 2mol / L ammonia water is used as complexing agent, pass N 2 Remove oxygen for 60 minutes; prepare 2mol / L ammonia aqueous solution as the bottom liquid and first add it to the reaction kettle, and pass N 2 As a protective gas, under mechanical stirring, the nickel-cobalt-manganese salt solution is added to the reaction kettle at a dropping rate of 1L / h by means of a metering pump, and the mixed solution of the precipitating agent and complexing agent is added dropwise, and the reaction system is precisely controlled. The pH value is 11.5, the reaction temperature is 70°C, and the stirring speed is 1000r / min. Co-precipitation reaction is carried out, and finally a light b...

Embodiment 3

[0050] Weigh nickel nitrate, cobalt nitrate, and manganese nitrate at a molar ratio of 6:2:2, and dissolve them in deionized water to prepare a total concentration of 4mol / L, pass inert gas to remove oxygen for 45 minutes; prepare 8mol / L sodium bicarbonate As a precipitant, 10mol / L citric acid as a complexing agent, through N 2 Remove oxygen for 30 minutes; prepare 10mol / L citric acid aqueous solution as the bottom liquid and add it to the reaction kettle first, and pass N 2 As a protective gas, under mechanical stirring, the nickel-cobalt-manganese salt solution is added to the reaction kettle at a rate of 50L / h by means of a metering pump, and the mixed solution of the precipitant and complexing agent is added dropwise, and the reaction system is precisely controlled The pH value is 9, the reaction temperature is 60°C, and the stirring speed is 700r / min. Co-precipitation reaction is carried out, and finally a light brown solid-liquid mixture is obtained. After centrifugation...

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Abstract

The invention relates to a preparation method of a high-capacity quickly-chargeable / dischargeable lithium ion battery ternary anode material, and aims to solve the technical problem that a ternary nickelate-cobaltate-manganate lithium ion battery anode material prepared with an existing preparation method cannot meet the market demand of rapid discharging / discharging. The method comprises the following preparation steps: performing a co-precipitation reaction on a nickelate-cobaltate-manganate solution and a mixed solution of a complexing agent and a precipitating agent under an appropriate condition to obtain a solid-liquid mixture of a precursor; performing filtration, washing and vacuum drying to obtain the precursor; and lastly, mixing the precursor with lithium salt powder, and performing segmented ventilation and sintering to obtain a target product. The anode material prepared with the preparation method has high tap density, high specific capacity, and high coulombic efficiency and excellent rate performance during first-time charging / discharging. When current density 20C is used for performing constant-current charging / discharging, the discharge specific capacity is over 110mAh / g; the cycle performance is high; and the market demand on high-capacity and high-rate power batteries can be met.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery cathode material, in particular to a preparation method of a high-capacity, fast-charging-discharge lithium-ion battery ternary cathode material. Background technique [0002] Since the first commercial lithium-ion battery was launched by Japan's SONY company in 1991, lithium-ion batteries have been widely used in 3C products such as mobile phones, digital cameras, and notebook computers. The emergence of lithium-ion batteries has undoubtedly brought great convenience to people's lives. With the development of science and technology and the acceleration of the pace of society, people are increasingly eager to use electronic products that can be charged quickly and have a long battery life, which will be more convenient for people's daily life. In recent years, with the increasing global demand for energy, under the tremendous pressure of traditional energy shortages and environment...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M10/0525H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 牛利孙中辉高玉舟吴同舜韩冬雪
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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