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Preparation method of full-gradient high-nickel ternary precursor and full-gradient high-nickel ternary cathode material

A positive electrode material and full-gradient technology, applied in electrical components, battery electrodes, structural parts, etc., can solve the problems that full-gradient materials are difficult to implement in industrial production, and achieve the effects of easy control, optimized performance, and reduced phase boundary resistance

Active Publication Date: 2021-11-05
湖南桑瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a full-gradient high-nickel ternary precursor and a preparation method for a full-gradient high-nickel ternary positive electrode material, and solve the technical problem that full-gradient materials are difficult to implement industrial production

Method used

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  • Preparation method of full-gradient high-nickel ternary precursor and full-gradient high-nickel ternary cathode material

Examples

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Effect test

Embodiment 1

[0039] see figure 1 , the process schematic diagram of the preparation method of the full-gradient high-nickel ternary positive electrode material, adding nickel sulfate and cobalt sulfate in deionized water to prepare 400L mixed solution A, and controlling the molar concentration of nickel and cobalt in the mixed solution A. The ratio is 0.95:0.05, and the sum of the molar concentration of nickel and cobalt in the control mixed solution A is 3mol / L; the mixed solution A is stored in the first raw material tank, and the stirring device arranged in the first raw material tank is started; Add nickel sulfate, cobalt sulfate, and manganese sulfate to deionized water to prepare a 200L mixed solution B, and control the molar concentration of nickel, cobalt, and manganese in the mixed solution B to a ratio of 5:2:3. The sum of the molar concentration of nickel, the molar concentration of cobalt and the molar concentration of manganese in mixed solution B is 2mol / L; Mixed solution B i...

Embodiment 2

[0044] see figure 1 , the schematic diagram of the process flow of the preparation method of the full-gradient high-nickel ternary positive electrode material, adding nickel sulfate, cobalt sulfate, and manganese sulfate in deionized water to prepare 300L mixed solution A, and controlling the molar concentration of nickel and cobalt in the mixed solution A The ratio of the molar concentration to the molar concentration of manganese is 8:1:1, and the sum of the molar concentration of nickel and cobalt in the mixed solution A is controlled to be 2mol / L; the mixed solution A is stored in the first raw material tank and started Stirring device provided in the first raw material tank; add nickel sulfate, cobalt sulfate, manganese sulfate in deionized water to prepare 100L mixed solution B, control the molar concentration of nickel, cobalt and manganese in the mixed solution B The ratio is 6:2:2, and the sum of the molar concentration of nickel, cobalt and manganese in the mixed sol...

Embodiment 3

[0046] see figure 1, the schematic diagram of the process flow of the preparation method of the full-gradient high-nickel ternary positive electrode material, nickel sulfate is added to deionized water to prepare 300L mixed solution A, and the molar concentration of nickel in the mixed solution A is controlled to be 4mol / L; the mixed solution A Store in the first raw material tank, start the stirring device that is provided with in the first raw material tank; Add nickel sulfate, cobalt sulfate, manganese sulfate in deionized water, prepare the mixed solution B of 100L, control the molar concentration of nickel in the mixed solution B, The ratio of the molar concentration of cobalt to the molar concentration of manganese is 4:2:4, and the sum of the molar concentration of nickel, the molar concentration of cobalt and the molar concentration of manganese in the mixed solution B is controlled to be 2mol / L; the mixed solution B is stored in In the second raw material tank, start ...

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Abstract

The invention discloses a preparation method of a full-gradient high-nickel ternary precursor and a full-gradient high-nickel ternary positive electrode material, comprising the following steps: preparing mixed solution A, mixed solution B and mixed solution C, mixed solution A, alkaline solution and The complexing agent is pumped into the reactor in parallel. After the reaction time T1, the mixed solution B is continuously pumped into the mixed solution A at a rate V1. After the reaction time T2, the mixed solution C is continuously pumped into the mixed solution B at a rate V2 Middle; Realize the continuous gradient of nickel salt, cobalt salt and manganese salt feed and composition, obtain the full gradient high nickel ternary precursor, mix the lithium source compound and the full gradient high nickel ternary precursor in molar ratio, the The obtained mixture is sintered in an oxygen atmosphere, and post-processed after sintering to obtain a full-gradient high-nickel ternary cathode material. The preparation method of the invention has strong operability, is easy to control, can be used in industrial production, and the obtained product has high capacity and good cycle stability.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a full-gradient high-nickel ternary precursor and a preparation method for a full-gradient high-nickel ternary positive electrode material. Background technique [0002] The energy crisis and energy security are the severe tests that countries in the world are currently facing. Improving the energy structure and realizing energy diversification is an inevitable choice for national development. Due to its advantages of high voltage, high specific energy, good cycle performance, and low environmental pollution, lithium-ion batteries have become a key direction for the development of new energy industries in various countries. The lithium-ion cathode material is an important part of the lithium-ion battery and a key point in the performance of the lithium-ion battery. [0003] The nickel-cobalt-manganese ternary cathode mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/505H01M4/52H01M4/525H01M10/0525
CPCY02E60/10
Inventor 陈敏唐泽勋商士波邹少良冯泽
Owner 湖南桑瑞新材料有限公司
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