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Method for removing lithium ion battery nickel-rich material surface lithium residues by liquid phase precipitation method

A lithium-ion battery, liquid-phase precipitation technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of affecting material rate performance, low ion diffusion coefficient, hindering lithium ion transmission, etc., to improve comprehensive electrochemical performance, Simple preparation process, excellent physical properties and excellent electrochemical properties

Active Publication Date: 2013-01-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ion diffusion coefficient of this kind of coating material is low, which hinders the transmission of lithium ions and affects the rate performance of the material. At the same time, lithium residues on the surface of the material still exist on the surface of the material, which has limited improvement in the storage performance and safety performance of the material.
[0011] So far, there is no report on the method of liquid phase precipitation to remove lithium residues on the surface of nickel-rich materials with lithium ions to improve the comprehensive performance of materials

Method used

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  • Method for removing lithium ion battery nickel-rich material surface lithium residues by liquid phase precipitation method
  • Method for removing lithium ion battery nickel-rich material surface lithium residues by liquid phase precipitation method
  • Method for removing lithium ion battery nickel-rich material surface lithium residues by liquid phase precipitation method

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Effect test

Embodiment 1

[0052] A certain amount of LiNi 0.8 co 0.2 o 2 The material was dispersed in an aqueous solution, filtered, and titrated with hydrochloric acid to roughly estimate the lithium residue content on the surface of the material. Will completely precipitate 100g LiNi 0.8 co 0.2 o 2 Required for lithium residues on the material surface (NH 4 ) 2 HPO 4 Dissolve in 25g deionized water, add 100g LiNi to it 0.8 co 0.2 o 2 Material. After evaporating water at 120°C, heat treatment at 800°C for 2 hours, and cooling naturally to obtain a surface coated with dense Li 3 PO 4 layer material. For its physical and chemical properties, see figure 1 , Figure 2, Figure 3 and Figure 4. XRD shows that the structure of the material does not change after the precipitation of lithium residues on the surface, and because the Li 3 PO 4 The amount is so small that Li cannot be detected 3 PO 4 Peak, SEM images show that the material morphology does not change significantly before and afte...

Embodiment 2

[0054] A certain amount of LiNi 0.8 co 0.1 mn 0.1 o 2 The material was dispersed in an aqueous solution, filtered, and sulfuric acid titration was used to roughly estimate the lithium residue content on the material surface. According to the theory, 100g LiNi is completely precipitated 0.8 co 0.1 mn 0.1 o 2 H required for lithium residues on the material surface 3 PO 4 60%, 80%, and 150% of the volume were added to 25g deionized water, and 100g LiNi was added to it respectively. 0.8 co 0.1 mn 0.1 o 2 Material. After evaporating water at 120°C, heat treatment at 500°C for 2 hours, and cooling naturally to obtain a surface coated with dense Li 3 PO 4 layer material. Take the above-mentioned materials and untreated materials respectively, beat them with a liquid-solid ratio of 10:1, let them stand for 30 minutes, and test the pH of the materials. The results are shown in Table 1. It can be seen from the pH that after adding phosphoric acid, the lithium residue on ...

Embodiment 3

[0058] A certain amount of LiNi 0.85 co 0.1 Al 0.05 o 2 The material was dispersed in an aqueous solution, filtered, and titrated with hydrochloric acid to roughly estimate the lithium residue content on the surface of the material. to (NH 4 ) 2 HPO 4 and NH 4 h 2 PO 4 The mixture is phosphate, and theoretically 100g LiNi is completely precipitated 0.85 co 0.1 Al 0.05 o 2 Add 60%, 80% and 150% of the required amount of lithium residue on the surface of the material to 25g of deionized water, and add 100g of LiNi to it 0.85 co 0.1 Al 0.05 o 2 Material. After evaporating water at 100°C, heat treatment at 800°C for 10 hours, and cooling naturally to obtain a surface coated with dense Li 3 PO 4 layer material. Take smears of the above materials and untreated materials and assemble the battery, charge it at 0.1C to 4.3V and put it in an environment of 90°C for 7 days, then disassemble the battery, and perform XRD characterization on the pole piece (Figure 7), whi...

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Abstract

The invention discloses a method for removing lithium ion battery nickel-rich material surface lithium residues by a liquid phase precipitation method. The method for removing the lithium ion battery nickel-rich material surface lithium residues by the liquid phase precipitation method includes the steps: dispersing lithium ion battery nickel-rich materials into phosphate solution, combining the nickel-rich material surface lithium residues with phosphate radical ions so as to form precipitation, nucleating on the material surface, and calcining so that a material with the surface wrapped with a compact Li3PO4 layer is obtained. The wrapping layer prepared by the method is more uniform and compact than a traditional wrapping layer, and storage performance of the material in air is obviously improved; and the moisture absorption performance of the nickel-rich materials can be improved while water brought into electrolyte by electrode materials is reduced, and structural stability of the material is enhanced. Moreover, Li3PO4 is better in stability in the electrolyte than in the battery materials, so that the comprehensive electrochemical performance of a positive electrode material can be effectively improved. The method for removing the lithium ion battery nickel-rich material surface lithium residues by the liquid phase precipitation method is simple in preparation process, short in flow path and low in production cost, and the prepared positive electrode material is excellent in physical performance and electrochemical performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery material, in particular to a method for removing lithium residues on the surface of a nickel-rich material of a lithium-ion battery by a liquid phase precipitation method. The invention belongs to the technical field of preparation of lithium ion materials. Background technique [0002] With the increasingly prominent problems of energy crisis, environmental pollution and resource shortage, people have attached great importance to the development of high-efficiency, clean, renewable energy and related technologies, and used cheap materials to make large-capacity, high-power, low-cost, high-efficiency, The technology of pollution-free lithium-ion batteries is gradually becoming mature, which has become a hot spot in the global new energy and material manufacturing industry, and the market demand is huge. Lithium-ion batteries have the advantages of high energy density, high working ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/48
CPCY02E60/12Y02E60/10
Inventor 王志兴熊训辉郭华军李新海彭文杰胡启阳
Owner CENT SOUTH UNIV
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