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Composite anode material, preparation method thereof and lithium ion battery comprising composite anode material

A technology for compounding cathode materials and cathode active materials, which is applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of low energy density and room temperature conductivity, corrosion of cathode materials, and low theoretical capacity, etc., to improve Coulomb efficiency and cycle. Stability, improved cycle life, improved effect of volume expansion

Inactive Publication Date: 2017-10-17
长沙小新新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium battery cathode materials are generally lithium oxides. The current marketable cathode materials mainly include lithium cobalt oxide, lithium manganese oxide with spinel structure, and lithium iron phosphate with olivine structure. Among them, the main advantages of lithium cobalt oxide are High electrical conductivity, simple production process and easy preparation, etc., but its high preparation cost and great environmental pollution have restricted its development.
Lithium manganese oxide has a spinel structure. Its main advantages are cheap price, high safety, and relatively easy preparation. The disadvantages are low theoretical capacity and poor high temperature performance.
Lithium iron phosphate material is one of the popular cathode materials studied in recent years. It has the advantages of high stability, safer, more environmentally friendly and low price. The disadvantage is that the energy density and room temperature conductivity are low, and the metal oxide cathode material The stability is poor. After long-term charging and discharging, the capacity of the battery will be significantly reduced, and the electrolyte will leak, which will cause corrosion to the positive electrode material and affect its service life. Demand for high energy density electronic products and long service life

Method used

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  • Composite anode material, preparation method thereof and lithium ion battery comprising composite anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]React 0.1mol cobalt nitrate and 0.3mol 2-methylimidazole in 20mL aqueous solution to obtain a complex solution, and combine the complex solution with 1,4-bis[(3,4-dioctyloxybenzene)-bisamide ] Benzene was dissolved in N,N-dimethylacetamide, heated to 50°C, stirred until dissolved to obtain an organic sol, after mixing evenly, continued to stir for 30 minutes, and aged for 6 hours to obtain cobalt-1,4-bis[ (3,4-dioctyloxybenzene)-bisamido]benzene gel;

[0037] Cobalt-1,4-bis[(3,4-dioctyloxybenzene)-diamido]benzene gel was calcined in argon at a temperature of 350°C for 3.5 hours to obtain cobalt / carbon skeleton;

[0038] Stir 0.1mol lithium hydroxide, 0.1mol cobalt nitrate, 0.05mol nickel nitrate, and 0.1mol ferrous hydrogen phosphate in 50mL of water to obtain a mixed solution, then transfer the cobalt / carbon skeleton and the mixed solution into the reactor, and The hydrothermal reaction was carried out at ℃, and LiCo was obtained after 6 hours of reaction 0.66 Ni 0....

Embodiment 2

[0047] (1) Preparation of positive electrode

[0048] Stir polyvinylpyrrolidone in dissolved water until it dissolves to obtain an organosol; react 0.1mol cobalt sulfate and 0.2mol 1,10-phenanthroline in 20mL of water to obtain a complex solution, and mix the complex solution with polyethylene Pyrrolidone was mixed with nitrogen methyl pyrrolidone, heated to 80°C, stirred for 35 minutes, and aged for 3 hours to obtain cobalt-polyvinylpyrrolidone gel;

[0049] The cobalt-polyvinylpyrrolidone gel was calcined in argon at a calcination temperature of 380°C and a calcination time of 4 hours to obtain a cobalt / carbon skeleton;

[0050] Stir 0.03mol of lithium phosphate, 0.075mol of cobalt sulfate, 0.025mol of zinc sulfate and 0.8mol of iron phosphorus source in 50mL of water to obtain a mixed solution, then transfer the cobalt / carbon skeleton and the mixed solution into the reaction kettle, at 150°C Carry out hydrothermal reaction, obtain LiCo after reaction 5.5h 0.75 Zn 0.25 PO...

Embodiment 3

[0056] React 0.1mol cobalt acetate and 0.4mol ethylenediamine in 20mL of water to obtain a complex solution, and mix the complex solution with N-(3,4-methoxybenzoyl)-N'-(4'-nitrate Benzoyl)hydrazine was dissolved in dimethyl sulfoxide, stirred at 60°C for 50min, and aged for 10h to obtain cobalt N-(3,4-methoxybenzoyl)-N'-(4'- Nitrobenzoyl) hydrazine gel;

[0057] The cobalt-N-(3,4-methoxybenzoyl)-N'-(4'-nitrobenzoyl)hydrazine gel was calcined in nitrogen, the calcination temperature was 400°C, and the calcination time was 4h. to obtain a cobalt / carbon framework;

[0058] Stir 0.1mol of lithium nitrate, 0.08mol of cobalt acetate, 0.02mol of manganese acetate and 0.12mol of ferrous hydrogen phosphate in 50mL of water to obtain a mixed solution. The hydrothermal reaction was carried out under the following conditions, and LiCo was obtained after 7 hours of reaction. 0.8 mn 0.2 PO 4 / C.

[0059] 95 parts by weight of LiCo 0.8 mn 0.2 PO 4 / C, 5 parts by weight of polydiphe...

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Abstract

The invention relates to the technical field of lithium ion batteries and discloses a composite anode material, a preparation method thereof and a lithium ion battery comprising the composite anode material. The composite anode material comprises the following substances: modified polysiloxane and LiCo(1-x)MxPO4 / C, wherein M is at least one of Fe, Mn, Ni, Zn, Mo, Ti and Mg. By compounding the LiCo(1-x)MxPO4 / C with the modified polysiloxane with porous structures to form a compound framework, the volume expansion of the electrode material in charging and discharging processes can be effectively improved, and meanwhile, the coulombic efficiency and the cycling stability of the battery are improved; and by compounding the LiCo(1-x)MxPO4 / C with the modified polysiloxane, the corrosive action of an electrolyte on the anode material is reduced, so that the stability of the battery is improved and the cyclic service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a composite positive electrode material, a preparation method thereof and a lithium ion battery containing the composite positive electrode material. Background technique [0002] In recent years, due to environmental pollution and lack of energy resources, all countries are trying to find new green, environmentally friendly and sustainable energy sources. Lithium battery is by far the most versatile and widely adaptable secondary battery, which has the advantages of high energy density, long cycle life and high working voltage. [0003] The capacity of the cathode material directly determines the capacity of the lithium battery, so finding a good cathode material and a good synthesis method directly affects the development trend of the lithium battery. Lithium battery cathode materials are generally lithium oxides. The current marketable cathode materials mainly inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/60H01M4/04H01M4/62
CPCH01M4/0471H01M4/362H01M4/5825H01M4/602H01M4/625Y02E60/10
Inventor 不公告发明人
Owner 长沙小新新能源科技有限公司
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