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Ternary positive-electrode material prepared by solvothermal method and preparation method thereof

A positive electrode material and a solvothermal technology are applied in the field of ternary positive electrode materials for lithium ion batteries and their preparation, which can solve the problems of complex preparation process and expensive raw materials, and achieve controllable morphology, uniform particles, and improved electrochemical performance. Effect

Inactive Publication Date: 2018-04-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the sol-gel method has the advantages mentioned above, there are also problems such as expensive raw materials and complicated preparation process; therefore, it is of great significance to seek new methods for preparing high-performance ternary cathode materials

Method used

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  • Ternary positive-electrode material prepared by solvothermal method and preparation method thereof
  • Ternary positive-electrode material prepared by solvothermal method and preparation method thereof

Examples

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Embodiment 1

[0024] Dissolve nickel nitrate, cobalt nitrate, and manganese sulfate in a molar ratio of 0.5:0.2:0.3 in a certain amount of deionized water and isopropanol mixed solution to prepare solution A. Dissolve a certain amount of urea and polyvinylpyrrolidone in a mixed solution of deionized water and isopropanol to prepare solution B. Mix solution A and solution B, stir for 0.5h, and configure solution C, in which the total concentration of metal ions is 0.2mol / L, the amount of polyvinylpyrrolidone added is 1g / L, and the amount of hydrolysis aid added is the total amount of metal ions The amount of 20 times, deionized water accounts for 10% of the total volume of the mixed solution C. The solution C was transferred to a 50ml stainless steel reaction kettle with polytetrafluoroethylene lining, and the temperature was raised from room temperature to 200°C, and the temperature was kept for 10h. The obtained product was filtered, washed, dried at 80°C for 10h, placed in a muffle furna...

Embodiment 2

[0027] Dissolve nickel acetate, cobalt acetate, and manganese acetate in a molar ratio of 0.98:0.01:0.01 in a certain amount of deionized water and a mixed solution of triethanolamine to prepare solution A. Dissolve a certain amount of urotropine and cetyltrimethylammonium bromide in a mixed solution of deionized water and triethanolamine to prepare solution B. Mix solution A and solution B, stir for 20 hours, and configure solution C, wherein the total concentration of metal ions is 0.002mol / L, the amount of cetyltrimethylammonium bromide is 15g / L, and urotropine The added amount is 0.5 times of the total amount of metal ions, and the deionized water accounts for 80% of the total volume of the mixed solution C. The solution C was transferred to a 100ml stainless steel reaction kettle with polytetrafluoroethylene lining, raised from room temperature to 160°C, and kept at this temperature for 20h. The obtained product was filtered, washed, dried at 80°C for 15h, placed in a mu...

Embodiment 3

[0030]Dissolve nickel chloride, cobalt chloride, and manganese acetate in a molar ratio of 0.8:0.1:0.1 in a deionized aqueous solution to form solution A. Solution B was prepared by dissolving sodium bicarbonate and hydroxyethylcellulose in deionized water. Mix solution A and solution B, stir for 5 hours, and configure solution C, wherein the total concentration of metal ions is 0.02mol / L, the amount of hydroxyethyl cellulose added is 10g / L, and the amount of sodium bicarbonate added is the total amount of metal ions 5 times the amount of substance. The solution C was transferred to a 100ml stainless steel reactor with polytetrafluoroethylene lining, and the temperature was raised from room temperature to 90°C for 2h. The obtained product was filtered, washed, dried at 80°C for 24h, placed in a muffle furnace, and calcined at 600°C for 4h in an air atmosphere (calcination heating rate was 5°C / min) to obtain a nickel-cobalt-manganese ternary oxide precursor . The ternary oxi...

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Abstract

The invention discloses a ternary positive-electrode material prepared by a solvothermal method and a preparation method thereof. The preparation method includes: dissolving nickel cobalt manganese salt in a solvent, adding a surfactant and hydrolysis auxiliaries, sufficiently stirring, transferring into a reaction kettle, performing solvothermal reaction under certain temperature for 2-24 hours,cooling to room temperature, using a suction filtration method to separate out a nickel cobalt manganese ternary product, washing, drying, and pre-calcining in air to obtain a precursor; grinding andmixing the precursor and a lithium compound, and calcining to obtain the ternary positive-electrode material. The ternary positive-electrode material and the preparation method thereof have the advantages that the ternary oxide precursor prepared by the solvothermal method is small in particle size, uniform in particle distribution and controllable in morphology as compared with a ternary precursor prepared by a conventional precipitation method, so that the finally prepared ternary material is small in granularity, uniform in particle size distribution and controllable in morphology and has excellent electrochemical performance, and the capacity and stability of the prepared ternary material are better than those of a ternary positive-electrode material prepared by the precipitation method.

Description

technical field [0001] The invention relates to a lithium-ion battery ternary positive electrode material and its preparation, in particular to a solvothermal method for preparing a ternary positive electrode material and a preparation method thereof. Background technique [0002] Nickel-cobalt-manganese ternary lithium-ion battery cathode materials have important advantages such as low cost, environmental friendliness, high specific capacity, good cycle performance and good safety. They are widely replacing lithium cobalt oxide and lithium iron phosphate and become a very important class of lithium Cathode materials for ion batteries. [0003] At present, the main process route of the industrial production of nickel-cobalt-manganese ternary cathode materials is the precipitation-lithium-mixing-roasting method. Generally, the precipitation method is used to first prepare the nickel-cobalt-manganese ternary precursor, and then mix it with lithium salt (mainly lithium carbonat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 廖世军卲奕嘉叶跃坤刘利娜
Owner SOUTH CHINA UNIV OF TECH
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