High-tap-density high-nickel ternary precursor as well as preparation method and application thereof

A technology of tap density and precursors, which is applied in the field of high-nickel ternary precursors, can solve the problems of low tap density of ternary precursors, ineffective utilization of three wastes, and high energy consumption, etc., to improve the particle size of precursors, Good uniformity and the effect of increasing energy density

Active Publication Date: 2020-04-17
大连融科储能集团股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a high-tap-density high-nickel precursor for the problems that the current nickel ternary precursor preparation process cannot be continuously carried out, the energy consumption is large, the three wastes cannot be effectively utilized, and the ta

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  • High-tap-density high-nickel ternary precursor as well as preparation method and application thereof
  • High-tap-density high-nickel ternary precursor as well as preparation method and application thereof

Examples

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Example Embodiment

[0044] Example 1

[0045] This embodiment discloses a method for preparing a high tap density and high nickel ternary precursor, which adopts methods such as figure 2 The reactor shown is a cylindrical reactor. Two baffles 1 are arranged longitudinally symmetrically on the inner side wall of the cylindrical reactor, and the baffles 1 extend in the radial direction. The ratio of the radial length to the inner diameter of the cylindrical reactor is 1.5:10; a stirring device is arranged at the center of the inner bottom of the cylindrical reactor.

[0046] High tap density and high nickel ternary precursor preparation method, such as figure 1 As shown, including the following steps:

[0047] Dissolve nickel sulfate hexahydrate, cobalt sulfate heptahydrate and manganese sulfate monohydrate in pure water according to the molar ratio Ni:Co:Mn=6:2:2, and prepare a salt solution with a total concentration of three metal ions of 2mol / L .

[0048] Dissolve sodium hydroxide in pure water to p...

Example Embodiment

[0053] Example 2

[0054] This embodiment discloses a method for preparing a high tap density and high nickel ternary precursor, which uses the same reactor as in Example 1, and includes the following steps:

[0055] Nickel sulfate hexahydrate, cobalt sulfate heptahydrate and manganese sulfate monohydrate were dissolved in pure water according to the molar ratio Ni:Co:Mn=6:2:2 to prepare three kinds of salts with a total concentration of 1.5 mol / L of metal ions Solution.

[0056] Sodium hydroxide is dissolved in pure water to prepare an alkali solution with a concentration of 4mol / L.

[0057] Dissolve ammonium sulfate in pure water to prepare a concentration of 5mol / L (in NH 4 + Calculated) complexing agent solution.

[0058] Nitrogen is used as the protective gas for the reaction, and its flow is controlled to 50L / h. The salt solution, complex solution and alkali solution are added to the bottom of the reactor via a peristaltic pump for co-precipitation reaction, and the feeding rate ...

Example Embodiment

[0061] Example 3

[0062] This embodiment discloses a method for preparing a high tap density and high nickel ternary precursor, which includes the following steps:

[0063] Dissolve nickel sulfate hexahydrate, cobalt sulfate heptahydrate and manganese sulfate monohydrate in pure water according to the molar ratio Ni:Co:Mn=6:2:2 to prepare a salt solution with a total concentration of three metal ions of 3mol / L .

[0064] Dissolve sodium hydroxide in pure water to prepare an alkali solution with a concentration of 6 mol / L.

[0065] Dissolve ammonium sulfate in pure water to prepare a concentration of 6mol / L (in NH 4 + Calculated) complexing agent solution.

[0066] Nitrogen is used as the protective gas for the reaction, and its flow is controlled to 150L / h. The salt solution, complex solution and alkali solution are respectively added to the reactor via a peristaltic pump for co-precipitation reaction, and the feeding rate of the salt solution and the ammonium sulfate solution are con...

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Abstract

The invention provides a high-tap-density high-nickel ternary precursor and a preparation method and an application thereof. The preparation method of the ternary precursor comprises the steps that a,a salt solution and a complexing solution are continuously added to the bottom of a reactor, and when the particle size D50 of a current precursor reaches 10-12 [mu]m, controlling the pH value of a reaction system to be 11.10-11.50; b, controlling the pH value of the reaction system to be 10.50-10.90 when the particle size D50 of the current precursor reaches 8-10 [mu]m; and repeating the step aand the step b for multiple times to obtain the high-tap-density high-nickel ternary precursor with the particle size D50 of 8-12 [mu]m and the tap density of 2.4-2.5 g/mL, thereby solving the problems of difficulty in controlling the size of the precursor, low tap density and the like in the prior art. According to the preparation method of the ternary material precursor, ammonia gas and waste liquid in a system are recycled, sodium sulfate in the system is separated out through cooling crystallization to be used as a by-product, and resource comprehensive utilization of three wastes is achieved.

Description

technical field [0001] The invention relates to high-nickel ternary precursor technology, in particular to a high-tap-density high-nickel ternary precursor, its preparation method and application. Background technique [0002] As a new generation of rechargeable high-energy batteries, lithium-ion secondary batteries have the advantages of high energy, good safety performance, long service life, low pollution, no memory effect, and low cost of electricity. They are widely used in mobile phones, digital cameras, and notebook computers. , instrumentation, electric vehicles and many other fields. [0003] In the whole composition of the lithium-ion secondary battery, the cathode material occupies a very important position, and its performance directly determines the performance of the final product, and its price also directly affects the cost of the lithium-ion secondary battery. The cathode materials of lithium-ion secondary batteries that are currently on the market mainly i...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01D5/00H01M4/505H01M4/525
CPCC01G53/006C01D5/00H01M4/505H01M4/525Y02E60/10
Inventor 孟昭扬李宗麟杜剑雄张瑾林永坤
Owner 大连融科储能集团股份有限公司
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