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A kind of preparation method of titanium-doped lithium ion cathode material precursor

A technology of positive electrode materials and precursors, which is applied in the field of new energy battery materials, can solve the problems such as the inability to uniformly mix precursors, and achieve uniform distribution in the precursors and good practicability.

Active Publication Date: 2021-04-27
HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The mixed synthesis method currently used is to mix titanium into the precursor, and pump nano-scale titanium oxide directly into the reactor according to the proportion to prepare the titanium-doped precursor. The incorporation of titanium can greatly improve the strength of the precursor, but the titanium is still It cannot be evenly mixed into the precursor, and titanium oxide particles can be clearly seen on the surface of the precursor

Method used

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  • A kind of preparation method of titanium-doped lithium ion cathode material precursor
  • A kind of preparation method of titanium-doped lithium ion cathode material precursor
  • A kind of preparation method of titanium-doped lithium ion cathode material precursor

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preparation example Construction

[0036] as attached Figure 1-4 Shown, a kind of preparation method of titanium-doped lithium ion cathode material precursor specifically comprises the following steps:

[0037] S1, prepare cobalt salt solution, liquid caustic soda solution, titanium-complex solution mixed solution for standby;

[0038] Industrial pure water is used to dissolve the cobalt salt crystal, and after filtration, a cobalt salt solution with a cobalt ion concentration of 80-120g / L is prepared, and the cobalt salt crystal is at least one of cobalt nitrate, cobalt chloride and cobalt sulfate. Dilute 32% industrial liquid caustic soda with industrial pure water, and prepare a liquid caustic soda solution with a sodium hydroxide concentration of 2.5-4 mol / L after filtering.

[0039] Mix 20% ammonia water, 40% ammonium sulfate and pure water in a volume ratio of 5-10:10-15:10 to prepare a complex complex solution, and use 37% hydrochloric acid and 60% nitric acid in a volume ratio of 2:1.5 Proportionally...

Embodiment 1

[0053] This embodiment provides a preparation method of a titanium-doped lithium ion cathode material precursor, comprising the following steps:

[0054] S1: Solution preparation;

[0055] Dissolve the cobalt nitrate crystals with industrial pure water, and filter to obtain a cobalt nitrate solution with a cobalt concentration of 80 g / L.

[0056] Dilute 32% industrial liquid caustic soda with industrial pure water, and prepare a liquid caustic soda solution with a sodium hydroxide concentration of 2.5 mol / L after filtration.

[0057] Mix 20% ammonia water, 40% ammonium sulfate and pure water in a volume ratio of 5:10:10 to prepare a complex complex solution, and use 37% hydrochloric acid and 60% nitric acid in a volume ratio of 2:0.5 to prepare a mixed solution acid, take 80g of titanium dioxide and dissolve it in 500ml of mixed acid to prepare a titanium solution, and the following reactions take place:

[0058] 4TiO 2 +12HCl+4HNO 3 →3TiCl 4 +Ti(NO 3 ) 4 +8H 2 o

[0...

Embodiment 2

[0068] This embodiment provides a preparation method of a titanium-doped lithium ion cathode material precursor, comprising the following steps:

[0069] S1: Solution preparation;

[0070] Dissolve the cobalt nitrate crystals with industrial pure water, and filter to obtain a cobalt nitrate solution with a cobalt concentration of 95g / L.

[0071] Dilute 32% industrial liquid caustic soda with industrial pure water, and prepare a liquid caustic soda solution with a sodium hydroxide concentration of 3 mol / L after filtration.

[0072] Mix 20% ammonia water, 40% ammonium sulfate and pure water in a volume ratio of 8:12:10 to prepare a complex complex solution, and use 37% hydrochloric acid and 60% nitric acid in a volume ratio of 2:1.5 to prepare a mixed solution acid, take 80g of titanium dioxide and dissolve it in 500ml of mixed acid to prepare a titanium solution, and the following reactions take place:

[0073] 4TiO 2 +12HCl+4HNO 3 →3TiCl 4 +Ti(NO 3 ) 4 +8H 2 o

[0074...

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Abstract

The invention discloses a preparation method of a titanium-doped lithium ion cathode material precursor, which mainly includes the following preparation steps: S1, preparing a cobalt salt solution, a liquid alkali solution, and a titanium complex solution mixed solution for standby; S2, preparing the cobalt salt solution , liquid caustic soda solution, and titanium-complex solution mixed solution are added to the reaction kettle in parallel for reaction, and cobalt hydroxide uniformly doped with titanium is prepared by co-precipitation method, and other impurity elements in cobalt hydroxide are removed by centrifugal washing treatment, Cobalt hydroxide with qualified impurity content is obtained; S3, titanium-doped cobalt hydroxide is sintered and mixed-batch demagnetization treatment to obtain a titanium-doped cobalt oxide precursor. The titanium-doped lithium ion positive electrode material precursor synthesized by the process of the present invention ensures the strength of the prepared titanium-doped lithium ion positive electrode material precursor, and at the same time, the prepared titanium element is evenly distributed in the precursor more uniformly, which effectively compensates for the existing There are technical flaws with good practicality.

Description

technical field [0001] The invention relates to the technical field of new energy battery materials, in particular to a preparation method of a titanium-doped lithium ion cathode material precursor. Background technique [0002] There are several development directions for high-voltage lithium-ion batteries: homogeneous doping in the bulk phase, heterogeneous doping in the bulk phase, and core-shell structure; the homogeneous doping in the bulk phase is the most important for the selection of doping phases. In batteries, Zr, Al, Ti, and Mg are generally selected as doping phases to improve the crystal structure stability of lithium-ion battery cathode materials under high charging voltage conditions. Ti is a very ideal doping phase, which can greatly enhance the crystal stability of cathode materials. However, in order to ensure the uniformity of the doped phase in the lithium-ion positive electrode material, at least the same spherical ring layer must be uniform, otherwise...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M10/0525C01G51/04
CPCY02E60/10
Inventor 徐祥訚硕喻鹏资旭辉
Owner HUNAN ZOOMWE NEW ENERGY TECH CO LTD