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Niobium-coated nickel-cobalt-manganese ternary precursor as well as preparation method and application thereof

A precursor, nickel-cobalt-manganese technology, used in chemical instruments and methods, nickel compounds, electrical components, etc., can solve problems such as poor interface stability of nickel-cobalt-manganese ternary cathode materials, battery cycle performance to be improved, and increased production costs. , to achieve a good coating effect, enhance the structure and cycle stability, reduce the effect of dissolution

Pending Publication Date: 2022-07-08
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the interface stability of the nickel-cobalt-manganese ternary positive electrode material prepared by the prior art method is poor, and the cycle performance of the battery needs to be improved
The existing coating process is independent of the conventional precursor and cathode material synthesis process, requiring additional coating equipment and auxiliary materials, which increases production costs
In addition, the increased coating process prolongs the production time of the product, and the change of coating conditions increases the operational complexity of production, which is unfavorable for the popularization and application of the nickel-cobalt-manganese ternary cathode material coating process

Method used

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  • Niobium-coated nickel-cobalt-manganese ternary precursor as well as preparation method and application thereof
  • Niobium-coated nickel-cobalt-manganese ternary precursor as well as preparation method and application thereof
  • Niobium-coated nickel-cobalt-manganese ternary precursor as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] will NiSO 4 , CoSO 4 , MnSO 4 According to the molar ratio of Ni:Co:Mn=0.9:0.05:0.05, a certain mass was weighed and dissolved in deionized water to prepare 5L of transition metal ion solution with a solubility of 2mol / L and 1L of niobium oxalate solution with a concentration of 0.01mol / L, the concentration of ammonia water is 0.5mol / L, and the concentration of sodium hydroxide solution is 2mol / L. using as figure 1 As shown in the reaction process, the ammonia solution with a concentration of 0.1 mol / L was added in the reactor as the bottom liquid, and the transition metal ion solution and the ammonia solution were respectively added to the reactor using a peristaltic pump, and the flow rate was 2ml / min, and the reaction was maintained. The temperature in the kettle is 55°C, the rotating speed of the stirrer is 800rpm / min, and sodium hydroxide solution is added at the same time, and the flow rate is adjustable within 0.1-10ml / min to keep the pH value of the solution ...

Embodiment 2

[0044] The difference from Example 1 is that the concentration of the niobium oxalate solution is 0.03 mol / L; the temperature is raised to 780° C. in the second stage of lithiation and calcination.

[0045] figure 2 For the SEM image of the niobium-coated nickel-cobalt-manganese ternary precursor in Example 2 and the distribution of Nb element on the particle surface, it can be observed that the Nb element is uniformly distributed on the surface of the precursor; image 3 It is the XRD pattern of the niobium-coated nickel-cobalt-manganese ternary precursor in Example 2. Due to the small amount of coating, only the characteristic peaks of the hydroxide precursor are displayed on the spectrum; Figure 4 The SEM image and the Nb element distribution diagram on the particle surface of the cathode material synthesized from the niobium-coated nickel-cobalt-manganese ternary precursor in Example 2 show that the Nb element is also uniformly distributed on the surface of the cathode m...

Embodiment 3

[0047] The difference from Example 1 is that niobium oxalate is replaced by niobium chloride; the concentration of niobium chloride solution is 0.05mol / L; the first stage of lithiation and calcination is heated to 450°C and kept for 2h, and then the second stage is heated to 750°C and kept for 14h. The electrochemical performance test data are shown in Table 1.

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Abstract

The invention belongs to the field of lithium ion batteries, and provides a niobium-coated nickel-cobalt-manganese ternary precursor as well as a preparation method and application thereof. The preparation method comprises the following steps: injecting a transition metal ion solution, a sodium hydroxide solution and an ammonia water solution into a coprecipitation method reaction kettle, introducing nitrogen for protection, regulating reaction conditions, and synthesizing a nickel-cobalt-manganese hydroxide precursor; and after the transition metal ion solution is fed, injecting a niobium source solution into the reaction kettle. And then taking out the solution from the reaction kettle, washing, filtering and drying to obtain a niobium-coated nickel-cobalt-manganese ternary precursor, and mixing and calcining the dried precursor and a lithium salt to obtain the niobium-modified nickel-cobalt-manganese ternary positive electrode material. According to the preparation method, the precursor synthesis step and the coating step are combined, coating is achieved in the reaction kettle, the prepared niobium-coated nickel-cobalt-manganese ternary precursor is uniform in particle size and good in consistency, the positive electrode material obtained after lithiation calcination is high in interface stability and small in residual alkali amount, and the cycling stability at the normal temperature and the high temperature is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a niobium-coated nickel-cobalt-manganese ternary precursor and a preparation method and application thereof. Background technique [0002] At present, the rapid development of the electric vehicle industry has promoted the development and application of power batteries. As the secondary battery with the best comprehensive performance, lithium-ion batteries have become the first choice for power batteries. In order to meet the market requirements for long cruising range of electric vehicles, the use of nickel-cobalt-manganese ternary materials with high specific capacity as the positive electrode is an important way to improve the energy density of power batteries. However, due to the high activity of nickel and its strong oxidizing properties in the charged state, the surface of the nickel-cobalt-manganese ternary cathode material is prone to redox side reactions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M10/0525H01M4/36H01M4/525H01M4/485H01M4/62
CPCH01M10/0525H01M4/366H01M4/525H01M4/485H01M4/628C01G53/006H01M2004/028Y02E60/10
Inventor 程方益张宇栋丁国彧李海霞陈军
Owner NANKAI UNIV
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