Method for preparing LiNi<1/3>Co<1/3>Mn<1/3>O<2> ternary cathode material

A positive electrode material and concentration technology, applied in the field of electrochemical power supply, can solve the problems of increasing the difficulty and cost of ternary material production, and achieve the effects of easy production operation, simple synthesis process, and reduced production cost

Active Publication Date: 2017-11-10
CHINA THREE GORGES UNIV +1
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  • Application Information

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  • Method for preparing LiNi&lt;1/3&gt;Co&lt;1/3&gt;Mn&lt;1/3&gt;O&lt;2&gt; ternary cathode material
  • Method for preparing LiNi&lt;1/3&gt;Co&lt;1/3&gt;Mn&lt;1/3&gt;O&lt;2&gt; ternary cathode material

Examples

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Example Embodiment

[0015] Example 1

[0016] 1.7515 g NiSO 4 ·6H 2 O, 1.8731 g CoSO 4 ·7H 2 O, 1.1266 g MnSO 4 ·H 2 O was sequentially dissolved in 40 mL of deionized water at a molar ratio of 1:1:1, stirred for 30 minutes to completely dissolve, and 1.6109 g of NaOH was added to 80 mL of deionized water. Then, add the mixed solution containing nickel ions, cobalt ions, and manganese ions dropwise to the NaOH solution, and add 15 mL with a concentration of 3.35 mol L -1 Ammonia water as a complexing agent, with 400 r min -1 Stir at a rotating speed of 50-55°C for 12 hours to obtain a black suspension. After standing for 6-8 hours, it is filtered, washed several times, and dried in an oven at 90°C for 9 hours to obtain a precursor. Add 0.7265 g Li to the precursor (1.8 g) 2 CO 3 , After ball milling with absolute ethanol for 6 hours, dry and sinter at 450 ℃ for 5 hours, then sinter at 900 ℃ for 12 hours, cool and sieving to obtain LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 Ternary cathode material. LiNi 1 / 3 Co 1 / 3...

Example Embodiment

[0017] Example 2

[0018] 1.7515 g NiSO 4 ·6H 2 O, 1.8731 g CoSO 4 ·7H 2 O, 1.1266 g MnSO 4 ·H 2 O was sequentially dissolved in 80 mL of deionized water at a molar ratio of 1:1:1, stirred for 30 minutes to completely dissolve, and 1.6109 g of NaOH was added to 80 mL of deionized water. Then, slowly drop the mixed solution containing nickel ions, cobalt ions, and manganese ions into the NaOH solution, and add 15 mL with a concentration of 3.35 mol L -1 As the complexing agent, the ammonia water was stirred at a speed of 400 r min-1, and the reaction was kept at 50-55℃ for 12 hours to obtain a black suspension. After standing for 6-8 hours, it was filtered and washed several times. Dry in an oven at ℃ for 9 hours to obtain a precursor. Add 0.7265 g Li to the precursor (1.8 g) 2 CO 3 , After 6 hours of ball milling with absolute ethanol as the medium, dry, sinter at 450 ℃ for 5 hours, then sinter at 900 ℃ for 12 hours, cool and sieving to obtain LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 Ternary c...

Example Embodiment

[0019] Example 3

[0020] 1.7515 g NiSO 4 ·6H 2 O, 1.8731 g CoSO 4 ·7H 2 O, 1.1266 g MnSO 4 ·H 2 O was dissolved in 200 mL of deionized water with a molar ratio of 1:1:1, and stirred for 30 minutes to completely dissolve it. At the same time, 1.6109 g of NaOH was added to 80 mL of deionized water. Then, slowly drop the mixed solution containing nickel ions, cobalt ions, and manganese ions into the NaOH solution, and add 15 mL with a concentration of 3.35 mol L -1 As the complexing agent, the ammonia water was stirred at a speed of 400 r min-1, and the reaction was kept at 50-55 ℃ for 12 hours to obtain a black suspension. After standing for 6-8 hours, it was filtered and washed several times. Dry in an oven at ℃ for 9 hours to obtain a precursor. Add 0.7265 g Li to the precursor (1.8 g) 2 CO 3 , After ball milling with absolute ethanol for 6 hours, dry, sinter at 450 ℃ for 5 hours, then sinter at 900 ℃ for 12 hours, cool and sieving to obtain LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 Ternary ca...

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Abstract

The invention provides a method for preparing a LiNi<1/3>Co<1/3>Mn<1/3>O<2> ternary cathode material. Specifically, the method comprises the steps of dropwise adding mixed solution of nickel salt, cobalt salt and manganese salt to NaOH solution, adding ammonia water as complex agent, carrying out stirring, and carrying out heat preserved reaction for 10-12 hours, thereby obtaining black suspension, and carrying out still standing, filtering, washing and drying to obtain precursor; carrying out ball-milling on the precursor and Li<2>CO<3> for 4-6 hours by taking anhydrous ethanol as medium, carrying out drying, carrying out sintering for 3-6 hours at the temperature of 400-500 degrees centigrade, and then carrying out sintering for 10-14 hours at the temperature of 850-950 degrees centigrade, and carrying out sieving to obtain the LiNi<1/3>Co<1/3>Mn<1/3>O<2> ternary cathode material. Compared with a traditional coprecipitation method, the preparation method provided by the invention has the advantage that nitrogen does not need to be imported, so the production cost is greatly reduced. According to the preparation method provided by the invention, in the process of synthesizing the precursor, a pH value of a reaction system does not need to be controlled strictly, namely, the pH value does not need to be adjusted by adding the ammonia water continuously in the process of synthesizing the precursor.

Description

technical field [0001] The invention relates to a simple and effective preparation of high-performance LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The invention discloses a method for a ternary cathode material, which belongs to the field of electrochemical power sources. Background technique [0002] Since Ohzuku and Makimura first proposed LiNi in 2001 1 / 3 co 1 / 3 mn 1 / 3 o 2 Since ternary materials can be used as cathode materials for lithium-ion batteries, this material has received widespread attention. LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Integrated LiCoO 2 , LiNiO 2 , LiMnO 2 The advantages of the three layered materials, Co can reduce cation mixing and stabilize the layered structure of the material, Ni can increase the material capacity, and Mn can not only reduce the material cost, but also improve the safety and stability of the material. Therefore, LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The ternary cathode material has many advantages such as high specific capacity, good cycle perfo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张露露王吉青杨学林蒋隆荣
Owner CHINA THREE GORGES UNIV
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