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Oxygen vacancy lithium titanate composite material and preparation method thereof and lithium titanate battery

A technology of composite materials and lithium titanate, which is applied in titanate, titanium compounds, secondary batteries, etc., can solve the problems of harsh process, difficult to form stable and uniform materials, and difficult conductive materials, so as to achieve simple and environmentally friendly process, The effect of improving the conductivity and increasing the charge-discharge rate

Inactive Publication Date: 2017-07-07
刘高侠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of the above-mentioned lithium titanate composite material has been improved to a certain extent, but the preparation process introduces graphene oxide and its graphene which are seriously polluted in the production process, and the process is harsh, and the conductive material is not easy to be firmly combined with lithium titanate, and it is difficult to form a stable and uniform composite material. s material

Method used

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  • Oxygen vacancy lithium titanate composite material and preparation method thereof and lithium titanate battery
  • Oxygen vacancy lithium titanate composite material and preparation method thereof and lithium titanate battery
  • Oxygen vacancy lithium titanate composite material and preparation method thereof and lithium titanate battery

Examples

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Embodiment 1

[0026] Example 1, a method for preparing an oxygen-deficient lithium titanate composite material, the method comprising: placing pure lithium titanate or lithium titanate doped with metal element M in a mixed gas atmosphere of an organic gas and an inert gas In 1000°C, heat for 5 minutes and cool to obtain an oxygen-deficient lithium titanate composite material;

[0027] The metal element M is selected from at least one of iron, cobalt, nickel, molybdenum, zirconium, copper, zinc, magnesium, aluminum, silicon, and rare earth elements;

[0028] The organic gas is one of alkanes, alkenes, alkynes or gaseous alcohols with seven carbon atoms or less, and the organic gas accounts for 5% of the total volume of the mixed gas.

Embodiment 2

[0029] Example 2, a method for preparing an oxygen-deficient lithium titanate composite material, the method comprising: placing pure lithium titanate or lithium titanate doped with metal element M in a mixed gas atmosphere of organic gas and inert gas , heat preservation at 700°C for 24 hours, and cool to obtain an oxygen-deficient lithium titanate composite material;

[0030] The metal element M is selected from at least one of iron, cobalt, nickel, molybdenum, zirconium, copper, zinc, magnesium, aluminum, silicon, and rare earth elements;

[0031] The organic gas is one of alkanes, alkenes, alkynes or gaseous alcohols with seven carbon atoms or less, and the organic gas accounts for 95% of the total volume of the mixed gas.

Embodiment 3

[0032] Example 3, a method for preparing an oxygen-deficient lithium titanate composite material, the method comprising: placing pure lithium titanate or lithium titanate doped with metal element M in a mixed gas atmosphere of organic gas and inert gas , heat preservation at 850°C for 12 hours, and cool to obtain an oxygen-deficient lithium titanate composite material;

[0033] The metal element M is selected from at least one of iron, cobalt, nickel, molybdenum, zirconium, copper, zinc, magnesium, aluminum, silicon, and rare earth elements;

[0034] The organic gas is one of alkanes, alkenes, alkynes or gaseous alcohols with seven carbon atoms or less, and the organic gas accounts for 40% of the total volume of the mixed gas.

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PUM

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Abstract

The invention discloses a preparation method of an oxygen vacancy lithium titanate composite material. The method comprises the steps of putting pure lithium titanate or metal element M-doped lithium titanate into a mixed gas of an organic gas and an inert gas, carrying out heat preservation at 700-1,000 DEG C for 5min to 24h, and cooling to obtain the oxygen vacancy lithium titanate composite material, wherein the metal element M is selected from at least one of iron, cobalt, nickel, molybdenum, zirconium, copper, zinc, magnesium, aluminum, silicon and rare earth element; the organic gas is at least one of alkane, olefin, alkyne or gaseous alcohol with seven or less carbon atoms; and the volume of the organic gas accounts for 5%-95% of the total volume of the mixed gas. The invention further discloses the oxygen vacancy lithium titanate composite material prepared by the method, and a lithium titanate battery adopting the oxygen vacancy lithium titanate composite material.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to an oxygen-deficient lithium titanate composite material and a preparation method thereof, and a lithium titanate battery using the oxygen-deficient lithium titanate composite material. Background technique [0002] Among secondary battery materials, lithium titanate material can maintain a high degree of stability in crystal structure during the process of lithium ion intercalation and extraction, and its volume hardly changes. It is a zero-strain material, so it has excellent cycle performance and stable discharge voltage; Lithium titanate material has a potential of 1.55V for deintercalation of lithium, which will not cause the precipitation of dendrite lithium, and has high safety; lithium titanate material has a three-dimensional lithium ion transmission channel, and the lithium ion diffusion coefficient (is 2*10 -8 cm 2 / s) is an order of magnitude higher t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525C01G23/00
CPCC01G23/005C01P2006/40H01M4/362H01M4/366H01M4/485H01M4/625H01M4/626H01M10/0525Y02E60/10
Inventor 陈永刘云龙刘高侠陈冠华
Owner 刘高侠
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