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Lithium titanate composite anode material and preparation method thereof

A negative electrode material, lithium titanate technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low lithium ion and electron conductivity, limit the practical application of materials, cycle performance degradation, etc., and achieve cycle life. Suppression, low cost, effect of increasing capacity

Active Publication Date: 2016-07-06
SHANDONG ZHAOWEN NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the lithium ion and electronic conductivity of the lithium titanate negative electrode material is low, the capacity decays rapidly during high-rate charge and discharge, and the rate performance is poor. Practical applications of the material

Method used

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  • Lithium titanate composite anode material and preparation method thereof
  • Lithium titanate composite anode material and preparation method thereof
  • Lithium titanate composite anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: The lithium titanate composite negative electrode material is prepared by the following process steps.

[0034] According to the Al / Ti molar ratio of 0.001 and Si / Ti molar ratio of 0.001, completely dissolve 2.22g of aluminum isopropoxide in 1.5L of absolute ethanol solution, and add 1kg of spinel lithium titanate material (pure lithium titanate) , 2000r / min high-speed dispersion for 6h; then add 1.66g of methyl orthosilicate, continue 2000r / min high-speed dispersion for 4h; finally dry at 100°C, and then sinter at 800°C for 10h, you can get the lithium titanate composite Negative material.

[0035] figure 1 is the XRD spectrum of the lithium titanate composite negative electrode material, from figure 1 It can be seen from the figure that the XRD pattern of the prepared lithium titanate composite negative electrode material corresponds well to the JCPDS card (No.49-0207) of the standard lithium titanate, indicating that the modified lithium titanate comp...

Embodiment 2

[0038] Embodiment 2: The lithium titanate composite negative electrode material is prepared by the following process steps.

[0039] According to the Al / Ti molar ratio of 0.005 and Si / Ti molar ratio of 0.005, completely dissolve 13.4g of aluminum sec-butoxide in 1.5L of absolute ethanol solution, add 1kg of spinel lithium titanate material, and disperse at a high speed of 2000r / min 4h; then add 11.3g ethyl orthosilicate, continue high-speed dispersion at 2000r / min for 6h; finally dry at 100°C, and sinter at 750°C for 10h to obtain the lithium titanate composite negative electrode material.

[0040] Figure 4 It is the HR-TEM photo of the lithium titanate composite negative electrode material; from Figure 4 It can be seen from the figure that there is an obvious coating layer on the surface of the lithium titanate composite negative electrode material, and the thickness of the coating layer is about 11-12 nm.

[0041] Electrochemical performance test: the test method is the ...

Embodiment 3

[0043] Embodiment 3: The lithium titanate composite negative electrode material is prepared by the following process steps.

[0044] According to the Al / Ti molar ratio of 0.001 and Si / Ti molar ratio of 0.03, completely dissolve 2.22g of aluminum isopropoxide in 1.5L of isopropanol solution, add 1kg of spinel lithium titanate material, and disperse at a high speed of 3000r / min 8h; then add 86.4g propyl orthosilicate, continue high-speed dispersion at 3000r / min for 4h; finally dry at 100°C and sinter at 730°C for 8h to obtain the lithium titanate composite negative electrode material.

[0045] Figure 5 It is the HR-TEM photo of the lithium titanate composite negative electrode material; from Figure 5 It can be seen that there is an obvious coating layer on the surface of the lithium titanate composite negative electrode material, and the thickness of the coating layer is about 6-7nm.

[0046] Electrochemical performance test: the test method is the same as in Example 1. Fi...

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Abstract

The invention discloses a lithium titanate composite anode material and a preparation method thereof. A coating layer coats the outside of the lithium titanate material; and the coating layer is a mixture of LiAlO2 and SiOx. The LiAlO2 on the surface of the anode material has ionic conductivity; the SiOx forms a solid electrolyte in the charge and discharge processes; the LiAlO2 and the SiOx are beneficial to improvement of the capacity and the rate capability of the anode material; the composite LiAlO2 / SiOx coating layer on the surface covers surface-active sites of the lithium titanate material; and reductive decomposition of the electrolyte is inhibited, so that a gas generated when the composite anode material is used as the anode material for a lithium-ion battery is reduced; and the service lifetime is effectively prolonged. The method is an effective path which can improve the capacity and the rate capability of the lithium titanate composite anode material, can prolong the cycle lifetime and can inhibit gas production of the lithium titanate composite anode material; and the method is friendly to environment, simple in process, low in cost and suitable for large-scale production, and has a wide market prospect.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a lithium titanate composite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, small self-discharge, and environmental friendliness. Compared with nickel-metal hydride batteries, lead-acid batteries and nickel-chromium batteries, they have more potential to become the power source of electric vehicles and energy storage power stations. . The large-scale research and development of new energy and electric vehicles has put forward higher requirements for the comprehensive performance of lithium-ion batteries. At present, lithium iron phosphate, lithium manganate, etc. are mostly used as positive electrode materials for lithium-ion power batteries, and carbon materials are mainly used for negative electrodes. Generall...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/139H01M4/48H01M10/0525
CPCH01M4/139H01M4/366H01M4/483H01M4/485H01M10/0525Y02E60/10
Inventor 李文刘振法魏爱佳张利辉李晓辉
Owner SHANDONG ZHAOWEN NEW ENERGY TECH CO LTD
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