Double-layer -coated modified high-nickel cobalt-free single crystal ternary positive electrode material and preparation method thereof

A double-layer coating and positive electrode material technology, applied in the direction of positive electrodes, active material electrodes, electrical components, etc., can solve the problems of poor electrochemical performance of positive electrode materials, achieve suppression of side reactions, reduce production costs, and simple preparation methods Effect

Active Publication Date: 2021-10-08
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the positive electrode material obtained by this method does not contain cobalt, the electrochemical performance of the positive electrode material is not good.

Method used

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  • Double-layer -coated modified high-nickel cobalt-free single crystal ternary positive electrode material and preparation method thereof
  • Double-layer -coated modified high-nickel cobalt-free single crystal ternary positive electrode material and preparation method thereof

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Experimental program
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Embodiment 1

[0031] The chemical formula of the double-coated modified high-nickel cobalt-free single crystal ternary positive electrode material in this embodiment is LiNi 0.90 mn 0.07 W 0.03 o 2 @TiO 2 @C.

[0032] The preparation method of the double-layer coated modified high-nickel cobalt-free single crystal ternary positive electrode material includes the following steps:

[0033] (1) Nickel sulfate, manganese sulfate and tungsten sulfate are added in deionized water in a molar ratio of 0.90:0.07:0.03, and stirred evenly to obtain a mixed salt solution with a total metal ion concentration of 4mol / L; the mixed salt solution, 4mol / L of precipitant NaOH solution and 5mol / L of complexing agent NH 3 ·H 2 The O solution was added into the reactor together, stirring continuously, the stirring speed was 400rpm, the temperature of the reactor was controlled at 65°C, the ammonia value of the reaction solution was 8g / L, and the pH value was 12, and the co-precipitation method was reacted...

Embodiment 2

[0040] The chemical formula of the double-coated modified high-nickel cobalt-free single crystal ternary positive electrode material in this embodiment is LiNi 0.90 mn 0.05 W 0.05 o 2 @Al 2 o 3 @C.

[0041] The preparation method of the double-layer coated modified high-nickel cobalt-free single crystal ternary positive electrode material includes the following steps:

[0042] (1) Nickel sulfate, manganese sulfate and tungsten sulfate are added in deionized water in a molar ratio of 0.90:0.05:0.05, and stirred evenly to obtain a mixed salt solution with a total metal ion concentration of 4mol / L; the mixed salt solution, 5mol / L of precipitant NaOH solution and 8mol / L of complexing agent NH 3 ·H 2 Add the O solution into the reaction kettle together, stir continuously, the stirring speed is 500rpm, the temperature of the reaction kettle is controlled at 60°C, the ammonia value of the reaction solution is 9g / L, and the pH value is 11.8, and the co-precipitation method is ...

Embodiment 3

[0049] The chemical formula of the double-coated modified high-nickel cobalt-free single crystal ternary positive electrode material in this embodiment is LiNi 0.90 mn 0.03 W 0.07 o 2 @CuO@C.

[0050] The preparation method of the double-layer coated modified high-nickel cobalt-free single crystal ternary positive electrode material includes the following steps:

[0051] (1) Nickel sulfate, manganese sulfate and tungsten sulfate are added in deionized water in a molar ratio of 0.90:0.03:0.07, and stirred evenly to obtain a mixed salt solution with a total metal ion concentration of 4mol / L; the mixed salt solution, 6mol / L of precipitant NaOH solution and 10mol / L of complexing agent NH 3 ·H 2 O solution was added into the reaction kettle together, stirring continuously, the stirring speed was 400rpm, the temperature of the reaction kettle was controlled at 65°C, the ammonia value of the reaction liquid was 8g / L, and the pH value was 11.5, and the co-precipitation method wa...

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Abstract

The invention discloses a double-layer-coated modified high-nickel cobalt-free single crystal ternary positive electrode material and a preparation method thereof, the chemical formula of the positive electrode material is LiNixMnyWzO2@TMO2@C, in the formula, x is greater than or equal to 0.9 and less than 1, y is greater than 0 and less than 0.06, z is greater than 0 and less than 0.04, x + y + z = 1, and TMO2 is one or more of oxides of Al, Mg, Cu and Ti. The preparation method comprises the following steps: (1) carrying out coprecipitation reaction on a nickel source, a manganese source, a tungsten source, a NaOH solution and an ammonia water solution to obtain a precursor; (2) uniformly mixing the precursor with a lithium source, and calcining to obtain a ternary positive electrode material; (3) mixing a TM source with the cobalt-free ternary positive electrode material, and calcining to obtain a single-layer coated ternary positive electrode material; and (4) mixing the single-layer coated ternary positive electrode material with a carbon source, and calcining to obtain the single-layer coated ternary positive electrode material. The double-layer -coated modified high-nickel cobalt-free single crystal ternary positive electrode material is good in electrochemical performance, the preparation method is simple, and the production cost is low.

Description

technical field [0001] The invention relates to a lithium-ion battery positive electrode material and a preparation method thereof, in particular to a double-coated modified high-nickel and cobalt-free single crystal ternary positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries play an important role in the rapidly developing field of new energy vehicles and electronic products such as mobile phones and notebooks. As one of the key materials of lithium-ion batteries, cathode materials directly affect the electrochemical performance of lithium-ion batteries, such as charge and discharge capacity, cycle performance, rate performance and thermal stability. With the continuous improvement of the energy density requirements of lithium-ion batteries and the rising price of Co-containing resources, the development of Co-containing cathode materials for lithium-ion batteries has been hindered, which has prompted people to f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/48H01M4/583H01M10/0525
CPCH01M4/366H01M4/525H01M4/505H01M4/483H01M4/583H01M10/0525H01M2004/028Y02E60/10
Inventor 张宝邓鹏程诚林可博周亚楠邓梦轩
Owner ZHUJI PAWA NEW ENERGY
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