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Surface-coated modified lithium-ion battery positive electrode material and preparation method thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor electron/ion conductance, unfavorable lithium ion redox reaction, and limited lattice stability, etc., to achieve high Good voltage withstand capability, lattice oxygen release problem, beneficial effect on cycle life and rate performance

Active Publication Date: 2017-02-08
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing coating methods also have certain deficiencies, such as the electronic / ionic conductivity of metal oxides is often poor, which is not conducive to the redox reaction of lithium ions on the surface of the material; The ionic conductance and lattice stabilization effects of the

Method used

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  • Surface-coated modified lithium-ion battery positive electrode material and preparation method thereof
  • Surface-coated modified lithium-ion battery positive electrode material and preparation method thereof
  • Surface-coated modified lithium-ion battery positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A surface-coated modified lithium-ion battery positive electrode material of the present invention, which is a core-shell structure, and the core is mainly a lithium-ion battery positive electrode material - a nano-sheet structure lithium-rich manganese material Li 1.2 mn 0.6 Ni 0.2 o 2 , the outer core is coated with Li 3 V 2 (PO 4 ) 3 A coated modified composite material composed of carbon materials, the quality of the coated modified composite material is 3% of the mass of the positive electrode material of the lithium ion battery in the core, wherein, Li 3 V 2 (PO 4 ) 3 The mass fraction in the coating modified composite material is 90%, and the mass fraction of carbon material in the coated modified composite material is 10%.

[0037] In this embodiment, the preparation method of the above-mentioned surface-coated modified lithium-ion battery positive electrode material specifically includes the following steps:

[0038] (1) Weigh 1.0507g of citric acid m...

Embodiment 2

[0044] A surface-coated and modified lithium-ion battery positive electrode material of the present invention, which is a core-shell structure, and the inner core is mainly lithium-ion battery positive electrode material - ternary material LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 , the outer core is coated with Li 3 V 2 (PO 4 ) 3 , carbon materials and carbon nanotubes are composed of coated modified composite materials, and the quality of coated modified composite materials is 10% of the mass of lithium-ion battery cathode materials in the core, wherein Li 3 V 2 (PO 4 ) 3 The mass fraction in the coated modified composite material is 80%, the mass fraction of carbon materials in the coated modified composite material is 15%, and the mass fraction of carbon nanotubes in the coated modified composite material is 5%. .

[0045] In this embodiment, the preparation method of the above-mentioned surface-coated modified lithium-ion battery positive electrode material specifically includ...

Embodiment 3

[0052]A surface-coated and modified lithium-ion battery positive electrode material of the present invention, which is a core-shell structure, and the inner core is mainly lithium-ion battery positive electrode material—LiCoO 2 , the outer core is coated with Li 3 V 2 (PO 4 ) 3 , a coated modified composite material composed of carbon materials and graphene, the quality of the coated modified composite material is 15% of the mass of the positive electrode material of the lithium ion battery in the core, wherein, Li 3 V 2 (PO 4 ) 3 The mass fraction in the coating modified composite material is 85%, the mass fraction of carbon material in the coated modified composite material is 10%, and the mass fraction of graphene in the coated modified composite material is 5%.

[0053] In this embodiment, the preparation method of the above-mentioned surface-coated modified lithium-ion battery positive electrode material specifically includes the following steps:

[0054] (1) Disso...

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Abstract

The invention discloses a surface-coated modified lithium ion battery cathode material which has a core-shell type structure. The inner core mainly employs a lithium ion battery cathode material, the external of the inner core is coated with a coating modifying composite material mainly consisting of Li3V2(PO4)3 and a carbon material, and the coating modifying composite material accounts for 1%-15% by mass of the lithium ion battery cathode material in the inner core. The mass fraction of Li3V2(PO4)3 in the coating modifying composite material is 70%-99%, and the mass fraction of the carbon material in the coating modifying composite material is 1%-30%. A preparation method of the surface-coated modified lithium ion battery cathode material comprises firstly preparing a sol, then adding the cathode material in the sol, and performing drying and sintering processing to obtain the product disclosed by the invention. The surface-coated modified lithium ion battery cathode material disclosed by the invention has the advantages of strong structure stability, strong electroconductivity, strong corrosion resistance, long cycle life and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery cathode material modification, and in particular relates to a coating modified lithium ion battery cathode material and a preparation method thereof. Background technique [0002] As an efficient energy storage and conversion device, lithium-ion batteries have been widely used in various portable electronic products due to their high energy density, long cycle life, no memory effect, and environmental friendliness. In recent years, with the rapid development of the economy, energy and environmental issues have become increasingly prominent. The demand for high-performance energy storage devices in fields such as electric vehicles and large stationary power stations has stimulated great enthusiasm for research on lithium-ion batteries. [0003] Lithium-ion battery cathode material is one of the key factors restricting its performance and cost. The existing lithium-ion battery cathode m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 庞胜利李剑晨沈湘黔廖达前周友元
Owner CHANGSHA RES INST OF MINING & METALLURGY
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