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Niobium modified lithium cobalt oxide anode material preparation method

A technology of niobium-modified lithium cobaltate and positive electrode materials, which is applied in nanotechnology for materials and surface science, battery electrodes, electrical components, etc. Coated silicon materials, difficult to uniformly disperse the agglomeration of nanomaterials, etc., to achieve the effect of alleviating the volume effect of silicon particles, low cost, and short time consumption

Inactive Publication Date: 2017-10-03
SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the above method 1) due to the use of nano-silicon materials, its cost is high, and it is difficult to disperse uniformly due to the agglomeration of nano-materials; method 2 uses high-energy ball milling, which has a long preparation cycle and high cost; method 3) uses chemical vapor deposition It is difficult to coat silicon material uniformly on the surface of graphite particles
In addition, it is difficult for the above methods to overcome the problem of taking into account both capacity play and first-time efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, the chemical formula of niobium modified lithium cobaltate is LiCo 0.86 Fe 0.12 Nb 0.02 o 2 According to the molar weight of Li, Fe, Nb, Co in the above chemical formula, lithium carbonate, iron acetate, niobium oxide and cobalt oxide are weighed, and an appropriate amount of water and ethanol are used as the dispersion medium, and the raw materials taken symmetrically are mixed by wet ball milling , to obtain a mixed slurry; spray-dry the mixed slurry to obtain lithium cobaltate precursor powder.

[0026] Apply a plasma arc to the precursor powder in a reducing atmosphere to melt the reaction powder, the plasma arc voltage is 20kV, and the plasma arc current is 500A; the molten reaction powder is sprayed into the cooling device with a reducing gas, and the particles are pulverized after cooling Sieving, the niobium-modified positive electrode lithium cobalt oxide material with a particle size of 5 microns obtained by sieving; wherein the diameter...

Embodiment 2

[0031] In this embodiment, the chemical formula of niobium modified lithium cobaltate is LiCo 0.82 Fe 0.15 Nb 0.03 o 2 . Weigh lithium carbonate, iron acetate, niobium oxide and cobalt oxide according to the molar weights of Li, Fe, Nb and Co in the above chemical formula, and use an appropriate amount of water and ethanol as the dispersion medium, and carry out wet ball milling of the raw materials that are taken symmetrically. The mixed slurry is obtained; the mixed slurry is spray-dried to obtain lithium cobaltate precursor powder.

[0032] Apply a plasma arc to the precursor powder in a reducing atmosphere to melt the reaction powder, the plasma arc voltage is 40kV, and the plasma arc current is 1000A; the molten reaction powder is sprayed into the cooling device with a reducing gas, and the particles are pulverized after cooling Sieving, the niobium-modified positive electrode lithium cobalt oxide material with a particle size of 10 microns obtained through sieving; w...

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Abstract

The invention relates to a niobium modified lithium cobalt oxide anode material preparation method. The method is simple and easy in operation, low in cost and low in time consumption. Nb ions are doped in an anode material to realize isomorphous substitution of Co ion sites in lattices of the anode material to change lattice parameters, so that the anode material excellent in electrochemical performance is obtained. The porosity characteristic of a carbon-silicon coating material is beneficial to electrolyte absorption and storage, and a space is provided for volume expansion of a silicon material in a charging-discharging process; due to nanoscale size of porous silicon, relief of volume effect of silicon particles is realized. Therefore, high reversible capacity, great cycle performance and excellent rate capability are realized.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a niobium-modified lithium cobalt oxide cathode material. Background technique [0002] As a recyclable high-efficiency new energy storage device, secondary batteries represented by lead-acid batteries, hydrogen-suppressed batteries and lithium-ion batteries have become an important technical approach to alleviate energy and environmental problems. Compared with traditional lead-acid, nickel-cadmium, nickel-metal hydride and other secondary batteries, lithium-ion secondary batteries have high working voltage, small size, light weight, high capacity density, no memory effect, no pollution, small self-discharge and good cycle life. Long life and other advantages. [0003] For positive electrode active materials for lithium secondary batteries, lithium-containing cobalt oxides (LiCoO 2 ). In addition, lithium-containing manganese oxides such as L...

Claims

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Application Information

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IPC IPC(8): B82Y30/00H01M4/36H01M4/38H01M4/525H01M4/583H01M4/62H01M10/0525
CPCB82Y30/00H01M4/366H01M4/386H01M4/525H01M4/583H01M4/624H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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