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Anode material for lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as complex operation, poor electrical conductivity of negative electrode materials for high-current charge and discharge, and easy aggregation of particles

Inactive Publication Date: 2012-02-15
SUZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, Snyder M Q (see: Journal of Power Sources, 2007, 165 (1): 379-385) reported that Li 4 Ti 5 o 12 Deposit a layer of TiN on the surface, so that Li 4 Ti 5 o 12 The conductive performance of the method is improved, but the method is complicated to operate, the cost is high, and the conditions are difficult to control
Kyu-Sung Park (see: J.Am.Chem.Soc., 2008, 130 (45): 14930-14931) reported the use of ammonia decomposition method in Li 4 Ti 5 o 12 Preparation of TiN film on the surface, the ammonia gas used in this method is corrosive and dangerous, and it is difficult to control the uniformity of material coating in large-scale production
[0006] The lithium-ion battery anode materials reported above are all prepared by roasting at high temperature for more than 10 hours. 4 Ti 5 o 12 The material is the raw material, since Li 4 Ti 5 o 12 Particles are easy to agglomerate, and long-term roasting will cause Li 4 Ti 5 o 12 The particles are too large, so that the prepared surface-modified Li with TiN 4 Ti 5 o 12 Poor conductivity and high current charge and discharge performance of negative electrode materials

Method used

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  • Anode material for lithium ion battery and preparation method thereof
  • Anode material for lithium ion battery and preparation method thereof
  • Anode material for lithium ion battery and preparation method thereof

Examples

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preparation example Construction

[0030] The invention discloses a preparation method of a negative electrode material of a lithium ion battery, which comprises the following steps:

[0031] Step a) mixing titanium dioxide and lithium carbonate, ball milling evenly, keeping the temperature at 750-850° C. for 10-180 minutes, and obtaining lithium titanate after cooling;

[0032] Step b) mixing the lithium titanate with a solid nitrogen source compound, then calcining under the protection of a protective gas, and obtaining a lithium ion battery negative electrode material after reaction.

[0033] In the above preparation method, the present invention firstly prepares lithium titanate, and then nitrates the lithium titanate to obtain TiN-surface-modified lithium titanate, that is, the lithium ion battery negative electrode material.

[0034] In the step a), the present invention uses titanium dioxide as the titanium source compound and lithium carbonate as the lithium source compound, and heats the titanium dioxi...

Embodiment 1

[0042] Li 4 Ti 5 o 12 Preparation of materials: Weigh Li according to the ratio of Li:Ti molar ratio of 0.8:1 2 CO 3 and anatase TiO 2 , acetone was used as a solvent, ball milled in a planetary ball mill at a speed of 300 rpm for 3 hours, the resulting mixture was dried at room temperature, placed in a muffle furnace at 800°C for 30 minutes, taken out, and cooled to room temperature to obtain Li 4 Ti 5 o 12 .

[0043] Li 4 Ti 5 o 12 Preparation of / TiN negative electrode material: according to the ratio of urea to the above-mentioned Li 4 Ti 5 o 12 The weight ratio is 6% to add urea, acetone is a solvent, with 300 revolutions per minute rotating speed in planetary ball mill ball mill 3 hours, after the gained mixture material is dried at room temperature, be placed in tube furnace, under argon atmosphere The temperature was raised to 800°C at a rate of 10°C / min, kept for 30 minutes and then cooled to room temperature to obtain Li 4 Ti 5 o 12 / TiN anode materi...

Embodiment 2

[0050] Li 4 Ti 5 o 12 The material was prepared in the same manner as in Example 1, and was fired in a muffle furnace at 800° C. for 10 minutes.

[0051] Li 4 Ti 5 o 12 The preparation of the / TiN negative electrode material is the same as in Example 1.

[0052] The XRD test results of the negative electrode material prepared in this embodiment are as follows: Figure 5 As shown, it can be seen from the figure that a large amount of reaction product Li has been produced after the mixed material is burned at 800°C for 10 minutes 4 Ti 5 o 12 generated, but there are still more TiO 2 No response.

[0053] Li 4 Ti 5 o12 The preparation and electrochemical testing of the / TiN negative electrode material are the same as in Example 1.

[0054] The electrochemical performance testing method of the negative electrode material prepared in this example is the same as that in Example 1. Li prepared by this example 4 Ti 5 o 12 The battery made of / TiN negative electrode ma...

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Abstract

The invention discloses a preparation method of an anode material for a lithium ion battery, which comprises the following steps of: mixing titanium dioxide with lithium carbonate to be ball-milled evenly, carrying out heat preservation for 10-180 minutes at the temperature of 750-850 DEG C and cooling to obtain lithium titanate; and mixing the lithium titanate with a solid-state nitrogen source compound to be calcined with the protection of protective gas, and obtaining the anode material for the lithium ion battery after reaction. In the step of preparing the lithium titanate, the time for heat preservation of raw materials at high temperature is greatly shortened, the aggregation of material particles caused by long-time ignition is avoided, the particle size of the lithium titanate is greatly reduced, and the modification area of TiN after the lithium titanate is nitrided is increased, so that the conductivity performance of the prepared anode material for the lithium ion battery is improved. In addition, due to the reduction of the particle size of the lithium titanate, the migration distance of lithium ions in a charge-discharge process of the lithium ion battery is reduced, and thus the large current charge-discharge performance of the anode material for the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and more specifically, relates to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] In recent years, with the increasing depletion of resources and the emergence of issues such as global warming, green and low-carbon lifestyles have been advocated. Among them, the development of electric vehicles and hybrid electric vehicles to partially replace internal combustion engine vehicles that consume fossil fuels is one of the main methods to solve the energy crisis and environmental degradation. Driving power is a key component that affects the popularization and use of electric vehicles. Today, widely used driving power includes lead-acid batteries, nickel metal hydride / nickel cadmium, lithium ion batteries, etc. Among various driving power sources, lithium-ion batteries have been extensively studied due to their advantages...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/1391C01G23/00
CPCY02E60/10
Inventor 郑军伟赵晓梅周群桓佳君李亚斌
Owner SUZHOU UNIV
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