High-energy-density multi-element positive electrode material and preparation method thereof

A technology of high energy density, positive electrode material, applied in the field of high energy density multi-element positive electrode material and preparation, can solve the problems of high cost of organic Zr source, inability to be applied on a large scale, low yield of hydrothermal method, etc. The effect of reducing residual inactive lithium content and interfacial resistance and increasing capacity

Active Publication Date: 2019-03-12
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the yield of the hydrothermal method is low, the requirements for equipment are high, and the cos

Method used

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  • High-energy-density multi-element positive electrode material and preparation method thereof
  • High-energy-density multi-element positive electrode material and preparation method thereof
  • High-energy-density multi-element positive electrode material and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0049] Example 1

[0050] Step 1 and Step 2 are consistent with the preparation steps of Comparative Example 1.

[0051] Step three, ZrO 2 , Lithium hydroxide and the cathode material matrix obtained in step 2 are put into a high-speed mixer at the same time as the material ratio of 0.5:3.8:100, mixed at 1200rpm for 10min, and then put into a muffle furnace for heat treatment. Heated at 600℃ for 8h in air atmosphere to get average particle size D 50 10μm, the main component of the coating layer is Li 8 ZrO 6 Of nickel-cobalt-manganese multi-component materials.

[0052] Such as figure 2 As shown, the surface of the secondary particles of the positive electrode material prepared in this embodiment is uniformly attached with fine coating particles to form a non-dense coating layer.

[0053] Such as image 3 As shown, in the XRD pattern of the nickel-cobalt-manganese multi-element cathode material prepared in this example, in addition to the main phase characteristic peaks of the multi-...

Example Embodiment

[0058] Example 2

[0059] Step 1. Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate at a metal molar ratio of 2:1:1 to obtain a 1.5mol / L mixed salt solution, and mix aluminum sulfate and sodium hydroxide at a molar ratio of 1:10 to prepare An aluminum solution with an aluminum ion concentration of 0.2mol / L; sodium hydroxide is dissolved into an alkali solution with a concentration of 5mol / L; ammonia water is dissolved into a complexing agent solution with a concentration of 2mol / L. Add the mixed salt solution, aluminum solution, alkali solution, and complexing agent solution into the reaction kettle in parallel flow to react. During the process, keep the stirring speed at 115rpm constant, control the pH to 11.8~12.0, and the temperature to 55℃. When the reaction is complete, keep The temperature and stirring speed remain unchanged, and the stirring is continued for 20 minutes, and then the prepared nickel-cobalt-manganese-aluminum hydroxide slurry is subjected to sol...

Example Embodiment

[0063] Example 3

[0064] Step 1. Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate in a metal molar ratio of 8:1:1 to obtain a mixed salt solution of 2.5mol / L. Dissolve sodium hydroxide into an alkaline solution with a concentration of 6mol / L. The ammonia water is dissolved into a complexing agent solution with a concentration of 6 mol / L. Add the mixed salt solution, alkali solution, and complexing agent solution into the reactor in parallel flow to react, keep the stirring speed constant at 125rpm, control the pH to 11.9~12.1, and the temperature to 65℃. When the reaction is complete, keep the temperature and stir. Stirring was continued for 20 minutes at the same speed, and then the prepared nickel cobalt manganese hydroxide slurry was subjected to solid-liquid separation and washing, and the filter cake was dried at 120° C. for 4 hours and then sieved to obtain spherical nickel cobalt manganese hydroxide material.

[0065] Step two: mixing the spherical nickel-cob...

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Abstract

The invention provides a high-energy-density multi-element positive electrode material and a preparation method thereof. The positive electrode material is composed of a substrate with a chemical formula Li1+a[(Ni1-2xCoxMnx)1-yMy]1-zM'zO2, and Li8ZrO6 and a lithium ion conductor LiuM''vOw which coat the surface of the substrate, wherein a is greater than or equal to -0.5 and is less than or equalto 0.3, M and M' are at least one element in La, Cr, Mo, Ca, Fe, Hf, Ti, Zn, Y, Zr, Si, W, Nb, Sm, V, Mg, B and Al, M'' is at least one element in Zr, Ti, Al, Si, Mn and Sn, and the total coating amount of a composite oxide is 0.01-3% of the molar weight of the substrate. The positive electrode material disclosed by the invention has relatively high energy density and cycling stability, and can beused for a lithium ion power battery. The preparation method of the material is simple in process, low in cost and suitable for large-scale production.

Description

technical field [0001] The invention relates to a high-energy-density multi-element cathode material and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] With the increase of people's demand for the battery life of electronic products and the mileage of electric vehicles, the development of lithium-ion batteries with high energy density has become an urgent demand in the current market. In lithium-ion batteries, the performance of the positive electrode material determines the overall performance of the battery. Among them, multi-component materials are considered to be one of the most promising lithium battery positive electrode materials due to their high voltage and high specific capacity. With the increase of nickel content in multi-component materials, the inactive residual lithium on the surface gradually increases, which seriously affects the capacity, rate and other properties of multi-component ma...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 邵宗普刘亚飞陈彦彬李建忠
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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