Novel NCA material and preparation method thereof

A new type of material-packed technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of coating damage, high pH value, easy water absorption, etc., and achieve the effect of reducing pH value and improving cycle performance.

Inactive Publication Date: 2016-04-06
HEFEI RONGJIE ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to a very high pH value of about 13 in the material after one-time sintering. If the pH value is too high, it will lead to (1) not suitable for storage, and it is easy to absorb water
(2) When making batteries and slurry, gel phenomenon occurs, and the slurry is jelly-like and cannot be dispersed and cannot be coated
But its pH value is very high, so the battery has a gel phenomenon
[0008] There is another situation in washing after coating. The sintered coating will be damaged during washing and stirring, so that the cycle performance cannot be improved.

Method used

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  • Novel NCA material and preparation method thereof
  • Novel NCA material and preparation method thereof
  • Novel NCA material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of novel NCA material provided by the present invention is made through the following steps successively: 1) 20g ammonium hexafluorophosphate is dissolved in 500g deionized water, stirs to dissolve completely, adds 1.6kg NCA (nickel cobalt aluminum Lithium acid) material, fully mix and stir to make it mix evenly;

[0026] 2) Dry in an oven, sieve, add to furnace and sinter at 400°C for 4 hours.

Embodiment 2

[0028] A kind of novel NCA material that the present invention provides, makes through following steps successively: 1) with 20g ammonium hexafluorophosphate, dissolve in 600g deionized water, stir to cause completely dissolving, add the NCA (nickel-cobalt-aluminum of 2.4kg wherein Lithium acid) material, fully mix and stir to make it mix evenly;

[0029] Dry it in an oven, sieve it, and put it into a furnace for sintering at 500°C for 2 hours.

Embodiment 3

[0031] A kind of novel NCA material provided by the present invention is made through the following steps successively: 1) 20g ammonium hexafluorophosphate is dissolved in 400g deionized water, stirs to dissolve completely, adds 1.6kg NCA (nickel cobalt aluminum Lithium acid) material, fully mix and stir to make it mix evenly;

[0032] 2) Dry in an oven, sieve, add to furnace and sinter at 500°C for 2 hours.

[0033] In order to better illustrate the advantages of the present invention, the capacity and cycle data of coated NCA materials after conventional water washing on the market are given below, see Figure 1 to Figure 3 , Table 1 to Table 3, the capacity and cycle data of NCA materials washed with water after coating, and the capacity and cycle data of NCA materials coated with ammonium hexafluorophosphate.

[0034] Table 1 The capacity and cycle data of coating after water washing

[0035]

[0036]

[0037] pass figure 1 As can be seen from Table 1, the coating...

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PUM

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Abstract

The present invention discloses a novel NCA material and a preparation method thereof, so as to provide a novel NCA material and a preparation method thereof, wherein not only a pH value of the novel NCA material can be lowed, but also cycling performance of the novel NCA material can be improved. The method is technically characterized in that the novel NCA material is an ammonium hexafluorophosphate coated NCA material. The preparation method comprises: 1) dissolving ammonium hexafluorophosphate in deionized water, stirring the solution until ammonium hexafluorophosphate is completely dissolved, adding an NCA material into the solution, and sufficiently mixing and stirring the solution to mix the solution uniformly; and 2) placing the solution in an oven and drying the solution, performing sieving, adding the material to a hearth to sinter at 400 DEG C to 500 DEG C for 2 to 4 hours, wherein a mass ratio of the ammonium hexafluorophosphate, the deionized water and the NCA material is 1:20 to 30:80 to 120. The novel NCA material and the preparation method thereof belong to the technical field of batteries.

Description

technical field [0001] The invention provides an NCA material and a preparation method thereof, specifically, an ammonium hexafluorophosphate-coated NCA material and a preparation method thereof; it belongs to the technical field of batteries. Background technique [0002] NCA is a product after high-temperature sintering of the precursor, with a capacity as high as 190mAh / g. But there are two important problems. [0003] First: In order to make the crystallization of the product more complete, the crystal lattice more perfect, and the purity higher. Lithium-rich sintering is used in the sintering process, which means that the lithium source is relatively excessive in the ingredients. This leads to a very high pH value of about 13 in the material after one-time sintering. If the pH value is too high, (1) it is not suitable for storage, and it is very easy to absorb water. (2) When making batteries and slurry, gel phenomenon occurs, and the slurry is jelly-like and cannot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCH01M4/58H01M4/5825Y02E60/10
Inventor 陈性保张兵
Owner HEFEI RONGJIE ENERGY MATERIALS CO LTD
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