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Method for continuous and stable preparation of lithium battery high nickel ternary precursor material

A technology for lithium batteries and precursors, which is applied in the field of continuous and stable preparation of high-nickel ternary precursor materials for lithium batteries, can solve the problems of the sphericity of the precursor, the difficulty in controlling the particle size, and the unstable preparation, and achieves a solution to the coating process. Difficult to control, uniform particle size distribution, controllable preparation effect

Inactive Publication Date: 2018-09-04
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the defects that the existing precursor system of high-nickel ternary materials is affected by discontinuous processes, the preparation is unstable, and the sphericity and particle size of the precursor are not easy to control, the present invention proposes a continuous and stable preparation of high-nickel ternary precursors for lithium batteries material method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The continuous and stable preparation of high-nickel ternary precursors for lithium batteries includes the following steps:

[0034] S1, the NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnCl 2 4H 2 After O is mixed according to the ratio of 8:1:1 in molar ratio, honey solution is added to obtain high-nickel dispersion A;

[0035] S2, the NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnCl 2 4H 2 O is mixed according to the molar ratio of 2:3:5 and then added to the honey solution to obtain the low-nickel dispersion B;

[0036] S3, Lithium hydroxide solution and triethanolamine are prepared into lye C according to the volume ratio of 50:50;

[0037] S4. During the working process of the rotary sedimentation chamber, nitrogen gas is continuously introduced, and the high-nickel dispersion A and alkali solution C are sprayed into the upper layer of the rotary sedimentation chamber from the opposite direction according to the volume ratio of 5:10, and the precipitate formed during the rotat...

Embodiment 2

[0042] The continuous and stable preparation of high-nickel ternary precursors for lithium batteries includes the following steps:

[0043] S1, the NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnCl 2 4H 2 After O is mixed according to the molar ratio of 6:1.5:1.5, honey solution is added to obtain high-nickel dispersion A;

[0044] S2, the NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnCl 2 4H 2 O is mixed according to the molar ratio of 1:2:4 and then added to the honey solution to obtain the low-nickel dispersion B;

[0045] S3, Lithium hydroxide solution and triethanolamine are prepared into lye C according to the ratio of volume ratio 40:60;

[0046] S4. During the working process of the rotary sedimentation chamber, nitrogen gas is continuously introduced, and the high-nickel dispersion A and alkali solution C are sprayed into the upper layer of the rotary sedimentation chamber from the opposite direction according to the volume ratio of 4:12, and the precipitate formed during the rota...

Embodiment 3

[0051] The continuous and stable preparation of high-nickel ternary precursors for lithium batteries includes the following steps:

[0052] S1, the NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnCl 2 4H 2 After O is mixed according to the molar ratio of 9:1.5:1.5, honey solution is added to obtain high-nickel dispersion A;

[0053] S2, the NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnCl 2 4H 2 O is mixed according to the molar ratio of 3:5:8 and then added to the honey solution to obtain the low-nickel dispersion B;

[0054] S3, Lithium hydroxide solution and triethanolamine are prepared into lye C according to the volume ratio of 60:40;

[0055] S4. During the working process of the rotary settling chamber, nitrogen gas is continuously introduced, and the high-nickel dispersion liquid A and alkali solution C are sprayed into the upper layer of the rotary settling chamber from the opposite direction according to the volume ratio of 10:15, and the precipitate formed during the rotating pro...

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Abstract

Belonging to the technical field of ternary battery preparation, the invention in particular relates to a method for continuous and stable preparation of a lithium battery high nickel ternary precursor. The method for continuous and stable preparation of a lithium battery high nickel ternary precursor provided by the invention carries out stepwise sinking in a high-speed rotating settling chamber,controls the composition of a synthetic precursor by continuous measurement, and sets different rotation rates in each layer of settling chamber so as to ensure the uniformity of settling particle size at each layer, utilizes high-speed rotation to realize spheroidization and controllable particle size of the high nickel ternary material, further realizes coating of low nickel with high nickel continuously, solves the defect of difficult control of the coating process at present, realizes continuous, stable and controllable preparation of high nickel precursor. The finally obtained ternary precursor has the characteristics of uniform particle size distribution, compact particles and high tap density, finally can be sintered and then applied to lithium ion batteries, and under the condition of 0.1C discharge rate, the discharge capacity is up to 296 mAh / g, and the capacity still remains at about 256 mAh / g after 200 cycles.

Description

technical field [0001] The invention belongs to the technical field of ternary battery preparation, and in particular relates to a method for continuously and stably preparing a high-nickel ternary precursor material for a lithium battery. Background technique [0002] Lithium battery ternary material (NMC) is a combination of LiCoO 2 , LiNiO 2 and LiMnO 2 The advantages of the three materials, due to the obvious synergistic effect among Ni, Co, and Mn, NMC has better performance than single-component layered cathode materials, and is considered to be one of the most promising new cathode materials. In ternary materials, Ni can be +2 and +3 according to the ratio of each element, Co is generally considered to be +3, and Mn is +4. The three elements play different roles in the material. When the charging voltage is lower than 4.4V (relative to the metal lithium anode), it is generally believed that Ni is the main element. 2+ Participate in the electrochemical reaction to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/052
CPCH01M4/366H01M4/505H01M4/525H01M10/052Y02E60/10
Inventor 陈庆曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD
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