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A kind of preparation method of lithium battery bamboo charcoal/lithium stannate composite negative electrode material

A negative electrode material, lithium stannate technology, used in battery electrodes, circuits, electrical components, etc., can solve the problems of reducing electrode cycle life, irreversible capacity increase, structure collapse, etc., to avoid excessive capacity decay and slow capacity. Attenuate and suppress the effect of agglomeration

Active Publication Date: 2015-11-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method described in the literature prepares pure phase Li 2 SnO 3 It has the following disadvantages: during the discharge cycle of the pure phase lithium stannate, the volume expands and shrinks, causing the grains to break and the structure to collapse, leading to the destruction of the electrode, reducing the cycle life of the electrode, and its lithium stannate in the deintercalation reaction It is easy to "agglomerate" when it occurs, resulting in an increase in the initial irreversible capacity and eventually a decrease in capacity

Method used

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  • A kind of preparation method of lithium battery bamboo charcoal/lithium stannate composite negative electrode material
  • A kind of preparation method of lithium battery bamboo charcoal/lithium stannate composite negative electrode material
  • A kind of preparation method of lithium battery bamboo charcoal/lithium stannate composite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) SnCl with a molar ratio of 0.5:3:2 4 ·5H 2 O: Ethylene glycol: Dissolve citric acid in deionized water, stir at 60°C for 1 hour;

[0022] (2) Then combine with SnCl 4 ·5H 2 O equimolar amount of Li 2 CO 3 Add it and stir at 90°C to evaporate a large amount of water to form a sol;

[0023] (3) Immerse 0.01mol of bamboo charcoal in the sol, so that the sol is completely immersed in the bamboo charcoal. After 1 hour, take out the bamboo charcoal and put it in a drying oven for drying at 180°C; repeat this step 3-4 times;

[0024] (4) Put the bamboo charcoal-xerogel precursor obtained in step (3) into a muffle furnace for rapid sintering to remove excess organic matter, then transfer it to a tube furnace for pre-sintering at 400°C under an argon atmosphere 5h, followed by calcination at 700°C for 4h to obtain bamboo charcoal / lithium stannate composite material.

[0025] The product in Example 1 was assembled into a CR2016 button battery, with a lithium sheet (Φ=1...

Embodiment 2

[0028] (1) SnCl with a molar ratio of 0.5:3:2 4 ·5H 2 O: Ethylene glycol: Dissolve citric acid in deionized water, stir at 60°C for 1 hour;

[0029] (2) Then combine with SnCl 4 ·5H 2 O equimolar amount of Li 2 CO 3 Add it and stir at 90°C to evaporate a large amount of water to form a sol;

[0030] (3) Immerse 0.03mol of bamboo charcoal in the sol, so that the sol is completely submerged in the bamboo charcoal. After 1 hour, take out the bamboo charcoal and put it in a drying oven for drying at 180°C; repeat this step 3-4 times;

[0031] (4) Put the bamboo charcoal-xerogel precursor obtained in step (3) into a muffle furnace for rapid sintering to remove excess organic matter, then transfer it to a tube furnace for pre-sintering at 400°C under an argon atmosphere 5h, followed by calcination at 700°C for 4h to obtain bamboo charcoal / lithium stannate composite material.

[0032]The product in Example 2 was assembled into a CR2016 button battery (the method is the same as...

Embodiment 3

[0033] Embodiment three: (bamboo charcoal amount is different)

[0034] (1) SnCl with a molar ratio of 0.5:3:2 4 ·5H 2 O: Ethylene glycol: Dissolve citric acid in deionized water, stir at 60°C for 1 hour;

[0035] (2) Then combine with SnCl 4 ·5H 2 O equimolar amount of Li 2 CO 3 Add it and stir at 90°C to evaporate a large amount of water to form a sol;

[0036] (3) Immerse 0.025mol of bamboo charcoal in the sol, so that the sol is completely immersed in the bamboo charcoal. After 1 hour, take out the bamboo charcoal and put it in a drying oven for drying at 180°C; repeat this step 3-4 times;

[0037] (4) Put the bamboo charcoal-xerogel precursor obtained in step (3) into a muffle furnace for rapid sintering to remove excess organic matter, then transfer it to a tube furnace for pre-sintering at 400°C under an argon atmosphere 5h, followed by calcination at 700°C for 4h to obtain bamboo charcoal / lithium stannate composite material.

[0038] The product in Example 3 wa...

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Abstract

The invention provides a preparation method of a lithium ion battery bamboo charcoal / lithium stannate composite negative electrode material. According to the invention, the bamboo charcoal / lithium stannate composite material is prepared with bamboo charcoal doping and sol-gel methods. According to the bamboo charcoal / lithium stannate composite material provided by the invention, lithium stannate is composed with porous bamboo charcoal with rich surface functional groups, such that lithium stannate is partially adhered to the surface of bamboo charcoal, and partially enters bamboo charcoal pore channels. With the special structure of bamboo charcoal, volume change is buffered, and material stability is improved. With the composition of bamboo charcoal and lithium stannate, volume change caused by charging and discharging can be effectively relieved, and an agglomeration phenomenon during lithium de-insertion is inhibited. Therefore, material electrode capacity excessively fast attenuation can be avoided, and the capacity of the bamboo charcoal / lithium stannate negative electrode material is greatly higher than a theoretical capacity of a common carbon material, and is higher than the cycle performance of pure-phase lithium stannate.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material in the technical field of lithium batteries, in particular to a preparation method of a lithium ion battery negative electrode material bamboo charcoal / lithium stannate composite material. Background technique [0002] Lithium-ion battery is one of the power sources with the best application and development prospects in recent years. The key to improving and improving the electrochemical performance of lithium-ion batteries is to find suitable electrode materials, so that the battery has a sufficiently high lithium storage capacity and good reversibility of lithium deintercalation to ensure large capacity, high voltage and long cycle life of the battery requirements. [0003] At present, there are many reports on the preparation and research of carbon-based anode materials at home and abroad. Most of the commercialized anode materials are also based on carbon-based material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/485
CPCY02E60/122Y02E60/10
Inventor 黄英赵阳张伟王秋芬宗蒙吴海伟
Owner NORTHWESTERN POLYTECHNICAL UNIV
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