Lithium ion battery anode material and preparation method thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of long cycle, increased cost, and cumbersome material preparation process, and achieve improved performance, small size, and uniform reactant particles. Effect

Active Publication Date: 2018-08-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The problem with the solid phase method is that the material needs to be milled many times during the preparation process, the preparation process of the material is cumbersome, the cycle is long, and the morphology and structure of t

Method used

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  • Lithium ion battery anode material and preparation method thereof
  • Lithium ion battery anode material and preparation method thereof
  • Lithium ion battery anode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0062] 0.57LiCrO 2 -0.43Li 3 NbO 4 Preparation of materials: Disperse 0.02mol citric acid (1:1 molar ratio to metal ions) in ionized water to obtain a dispersion; add 0.013mol lithium nitrate, 0.004mol cadmium nitrate, and 0.003mol niobium oxalate to the dispersion, Stir continuously at a stirring speed of 600r / min, stir for 60min until the raw materials are completely dissolved to obtain a uniform solution, adjust the pH to 7.0, add 4.5ml of ethylene glycol (the molar ratio to the metal ion is about 4:1), and stir at 80°C until Gel occurs (stirring speed is 500r / min); Stirring time is 100min;

[0063] The obtained gel was aged for 8 h; then dried and sintered at a low temperature under a nitrogen atmosphere (500° C. for 2 h). The resulting low-temperature sintered product was cooled and pressed into small discs under a pressure of 6Mpa, and then sintered at 950°C for 14 hours in a nitrogen atmosphere to obtain the lithium-ion battery cathode material 0.57LiCrO 2 -0.43Li3N...

Embodiment 2

[0067] 0.57LiCrO 2 -0.43Li 3 NbO 4 Preparation of materials: Disperse citric acid (with a molar ratio of 1:1.5 to metal ions) in ionized water to obtain a dispersion; add 0.013mol lithium nitrate, 0.004mol cadmium nitrate, and 0.003mol niobium oxalate to the dispersion, Stir continuously at a stirring speed of / min, stir for 120min until the raw materials are completely dissolved to obtain a uniform solution, adjust the pH to 8.0, add 5ml of ethylene glycol (the molar ratio to the metal ion is 4.5:1), and stir at 80°C until gel appears ( The stirring speed is 400r / min); the stirring time is 120 min;

[0068] The resulting gel was aged for 10 h; dried, and then sintered at a low temperature under an argon atmosphere (4 h at 450° C.). The resulting low-temperature sintered product was cooled and pressed into 1mm-thick small discs (0.01mol) under a pressure of 7Mpa, and then sintered at 900°C for 8 hours under an argon atmosphere to obtain the lithium-ion battery cathode mater...

Embodiment 3

[0071] Preparation of 0.57LiVO by Sol-Gel Method 2 -0.43Li 3 NbO 4 Materials: Disperse citric acid (with a molar ratio of 1:2 to metal ions) in ionized water at 0.01 to obtain a dispersion; add 0.013mol of lithium acetate, 0.004mol of ammonium metavanadate, and 0.003mol of niobium oxalate to the dispersion. Stir continuously at a stirring speed of 300r / min, stir for 180min until the raw materials are completely dissolved to obtain a homogeneous solution, adjust the pH to 8, add 1g of sucrose, then add 5.6ml of ethylene glycol (the molar ratio to the metal ion is about 5:1), 80°C Stir until gel appears (stirring speed is 600r / min); Stirring time is 90min;

[0072] The obtained gel was aged for 8 hours; then dried, and then sintered at a low temperature under a nitrogen atmosphere (500° C. for 2 hours). The resulting low-temperature sintered product was cooled and pressed into thick discs under a pressure of 7.5Mpa, and then sintered at 950°C for 24 hours under an argon atmos...

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Abstract

The invention provides a lithium ion battery anode material and a preparation method thereof. The preparation method comprises the steps: adding a soluble lithium source, a source A and a source B into dispersion liquid containing an organic complexing agent; evenly stirring to obtain a solution; adjusting a pH of the solution as 6 to 8; adding alcoholic organic solvents into the solution; continuously stirring under 70 to 90 DEG C until gel is formed; performing low temperature sintering on the gel after the gel is aged; performing high temperature sintering again after cooling to obtain thelithium ion battery anode material. A molecular formula of the lithium ion battery anode material is LiAO2-LixBOy, the x is larger than or equal to 2 and smaller than or equal to 4, and the y is larger than or equal to 3 and smaller than or equal to 5. The lithium ion battery anode material LiAO2-LixBOy (the x is larger than or equal to 2 and smaller than or equal to 4, and the y is larger than orequal to 3 and smaller than or equal to 5) prepared by the preparation method disclosed by the invention has high capacity and good cycling performance.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof, belonging to the field of preparation of lithium ion cathode materials. Background technique [0002] With the increasingly urgent demand for lithium-ion batteries with high specific energy in the electric vehicle market, lithium-ion battery materials have been used as power sources for electric vehicles in the past ten years, although their specific energy density has increased a lot in the past three decades. But there is still room for further improvement. Lithium-rich manganese oxide Li 2 MnO 3 As well as its derivative materials exhibit high reversible capacity, the reason is that negatively charged oxygen ions can provide charge compensation, and at the same time accompanied by the redox process of normal transition metal ions, such materials display unusual electrochemical properties and new The electrochemical charge and discharge mechanism is o...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525
CPCH01M4/362H01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 胡国荣杜柯彭忠东曹雁冰李小康亓先跃
Owner CENT SOUTH UNIV
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