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Titanium-based oxide lithium ion battery anode material and performance test method thereof

A titanium-based oxide, lithium-ion battery technology, applied in battery electrodes, material analysis by electromagnetic means, material analysis, etc., can solve problems such as poor electrochemical performance of materials, achieve high specific capacity, high activity, avoid crystal The effect of increasing particle size

Inactive Publication Date: 2019-10-15
DONGGUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the existing problems of low electrical conductivity and poor electrochemical performance of the material caused by the agglomeration of nanoparticles, the present invention provides a titanium-based oxide lithium-ion battery negative electrode material and its performance testing method, by using glucose and carbon nano The silicon / carbon / lithium titanate anode material prepared by using tube as a dual carbon source, high-activity silicon powder prepared from rice husk as a silicon source, lithium carbonate and titanium-based oxide titanium dioxide effectively inhibits the agglomeration of the material, and the carbon in the material The source has high electronic conductivity, forming a conductive network that is conducive to the transmission of lithium ions, which is conducive to the rapid transmission of lithium ions, so that it has high specific capacity and stable cycle, high conductivity and excellent electrochemical performance. performance

Method used

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  • Titanium-based oxide lithium ion battery anode material and performance test method thereof
  • Titanium-based oxide lithium ion battery anode material and performance test method thereof
  • Titanium-based oxide lithium ion battery anode material and performance test method thereof

Examples

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Embodiment 1

[0032] A method for preparing a titanium-based oxide lithium-ion battery negative electrode material, comprising the following preparation steps:

[0033] (1) Preparation of silicon powder: Pickle 500g of rice husk in dilute hydrochloric acid, place it in a constant temperature water bath at 65°C for 1 hour, and then dry it in a blast drying oven. After drying, put the rice husk in a muffle furnace at 600°C Burn for 40 minutes, cool naturally, and then evenly mix rice husk ash and magnesium powder with a mass ratio of 1:0.8 and put them into the tube reactor. Inject argon, heat to 750°C and ignite for 4.5 hours, take out the ignited powder and put it in a 70°C water bath for 1 hour, then perform suction filtration, wash, and place it in a blast drying oven to dry to obtain silicon powder;

[0034] (2) Preparation of lithium titanate crystals: Lithium carbonate and titanium-based titanium dioxide with a material ratio of 2.3:5 are placed in a ball mill, and acetone is used as a...

Embodiment 6-10

[0045] On the basis of Example 1, during the preparation of lithium titanate crystals, the microwave reaction temperature is 600°C-800°C, the content of the negative electrode material is 15% of the silicon content, 12% of the glucose content, and 2% of the carbon nanotube content. %, lithium titanate content is 71%.

[0046] Considering the influence of the microwave reaction temperature on the electrochemical performance during the preparation of lithium titanate crystals, under the condition that other conditions remain unchanged, by changing the microwave reaction temperature, the specific capacity and cycle life were investigated. Examples 6-10, as shown in Table 2 shown.

[0047] Table 2:

[0048] Example Microwave reaction temperature (°C) Current density is 1C first charge specific capacity (mAh / g) The current density is 1C first discharge specific capacity (mAh / g) first capacity retention Current density is 1C cycle 500 charge specific capacity (m...

Embodiment 11-15

[0051] On the basis of Example 1, during the preparation of lithium titanate crystals, the microwave reaction temperature is 750°C, the content of the negative electrode material is 12% of the silicon content, 5-20% of the glucose content, and 3% of the carbon nanotube content , Lithium titanate content is 70-80%.

[0052] Considering the influence of glucose content on electrochemical performance, the specific capacity and cycle life were investigated by changing the glucose content under the condition that other conditions remained unchanged. Examples 11-15 are shown in Table 3.

[0053] table 3:

[0054] Example glucose content Current density is 1C first charge specific capacity (mAh / g) The current density is 1C first discharge specific capacity (mAh / g) first capacity retention Current density is 1C cycle 500 charge specific capacity (mAh / g) Current density is 1C cycle 500 discharge specific capacity (mAh / g) 500 cycles capacity retention 11 5% ...

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Abstract

The invention provides a titanium-based oxide lithium ion battery anode material and a performance test method thereof, belonging to the field of lithium ion battery materials. The method comprises the following steps of: performing ball-milling of an organic carbon source and a carbon nano tube serving as double carbon sources, high-activity silicon powder prepared from rice hulls serving as a silicon source, lithium carbonate and titanium-based oxide titanium dioxide serving as raw materials, performing ultrasonic dispersing in ethyl acetate, and performing drying in vacuum, igniting and cooling to obtain a battery anode material silicon / carbon / lithium titanate. The electrode material is subjected to battery assembling to perform electrochemical performance test, the carbon source in thematerial effectively suppresses the material agglomeration phenomenon and has the high electronic conductivity to form a conductive network facilitating fast transmission of lithium ions, and therefore, the titanium-based oxide lithium ion battery anode material has the high specific capacity, stable cycle, high conductivity and a good electrochemical performance.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a titanium-based oxide lithium-ion battery negative electrode material and a performance testing method thereof. Background technique [0002] With the massive consumption of non-renewable resources, the traditional energy supply is increasingly exhausted. As a substitute for traditional energy, lithium-ion batteries are an important energy storage resource in the world today. Lithium-ion batteries have high energy density, high power density and The advantages of long cycle life have been widely used in portable electronic equipment, communication equipment, static energy storage systems and the huge electric vehicle market. However, in the process of charging and discharging of traditional lithium-ion batteries, the potential distribution is uneven due to the unevenness of the lithium surface. This uneven deposition will produce dendrites on the surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/485H01M4/62H01M10/0525C01B32/158G01N27/30G01N27/48
CPCC01B32/158G01N27/308G01N27/48H01M4/362H01M4/386H01M4/483H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 徐进海洋
Owner DONGGUAN UNIV OF TECH
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