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Preparation method of peach-kernel-shaped SnO2-graphene-carbon composite material for lithium ion battery

A technology of lithium-ion batteries and carbon composite materials, applied in the field of materials, can solve problems such as structural damage, shedding, and poor cycle stability

Active Publication Date: 2014-06-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently SnO 2 - During the synthesis of graphene composites, graphene mainly acts as a load, forming an approximately sandwich-like sandwich structure. The particles of the composite material still present the sheet-like shape of graphene. After a long-term cycle, the irreversible volume expansion of the tin dioxide particles causes the Destruction and shedding, poor cycle stability

Method used

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  • Preparation method of peach-kernel-shaped SnO2-graphene-carbon composite material for lithium ion battery
  • Preparation method of peach-kernel-shaped SnO2-graphene-carbon composite material for lithium ion battery
  • Preparation method of peach-kernel-shaped SnO2-graphene-carbon composite material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Mix and stir

[0027] 0.9g graphene oxide and 13.3g tin chloride (SnCl 4 ·5H 2 O) Dissolve in 600mL and 80mL deionized water respectively, sonicate and stir until graphene oxide and SnCl 4 ·5H 2 O is completely dissolved. Afterwards, the above two solutions were mixed together, ultrasonicated and stirred for more than 36 hours.

[0028] (2) spray drying

[0029] The above solution was spray-dried in a spray-drying apparatus, and the experimental parameters were inlet temperature of 180°C, feed rate of 2r / min, and blast pressure of 0.2Mpa. The spray precursor powder material is prepared by spray drying.

[0030] (3) Hydrothermal treatment

[0031] Weigh 1 g of the spray-dried precursor and dissolve it in 80 mL of 0.01 g / mL glucose solution, stir for 6 h, then perform hydrothermal reaction at 180 °C for 5 h, wash with water several times, and dry at 80 °C for 12 h.

[0032] (4) Calcination process

[0033] The collected samples were kept in H 2 / Ar atmospher...

Embodiment 2

[0039] The difference between this embodiment and Example 1 is that the quality of graphene oxide and tin chloride is 00.8g and 23.6g respectively, and they are dissolved in 500ml and 100ml deionized water respectively. After the two are completely dissolved in water, the two are mixed Ultrasonic stirring for more than 48h. When spray drying, set the feed rate to lr / min. During the hydrothermal process, the stirring time of the spray precursor and the glucose solution was set to 10 h. During the calcination process, the composite material was heat-treated at 550° C. for 20 minutes to prepare a carbon-coated peach kernel-shaped tin-based composite material for the negative electrode of lithium-ion batteries.

[0040] Image 6Shown are the cycle and rate performance curves of the composite prepared in Example 2. The composite material has excellent cycle stability at a higher rate, and the composite material still has a high capacity of 650mAh / g at a high current density of 1...

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Abstract

The invention discloses a preparation method of a peach-kernel-shaped SnO2-graphene-carbon composite material for a lithium ion battery. The preparation method comprises the steps: with tin salt as a raw material of the composite material and graphene oxide as a carrier, mixing tin salt and graphene oxide, then, carrying out ultrasonic treatment, stirring and spraying to prepare a precursor of the composite material; then, mixing the precursor and a carbon source solution, and next, carrying out hydrothermal treatment to prepare the composite material. The peach-kernel-shaped carbon-coated tin-based composite material prepared by using the method has the advantages that SnO2 particles are loaded on graphene, then, a carbon layer is coated outside the composite material, and the whole structure is shaped like a peach kernel and can be used for better constraining the volume change of tin dioxide particles, so that the material has more excellent cyclic performance.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a method for preparing a peach kernel-shaped tin-based composite material by adopting a spray drying-hydrothermal method. Background technique [0002] The development of electric vehicles and hybrid electric vehicles has promoted the development of the lithium-ion battery industry. The development of new materials with high specific capacity and high safety that can replace graphite negative electrodes is coming soon. SnO 2 As a kind of lithium-ion battery anode material with high safety and high specific capacity, it has attracted people's attention. [0003] Due to SnO 2 During the lithium ion deintercalation process, the material undergoes a large volume change, which leads to the shedding and pulverization of the active material, and finally leads to the deactivation of the electrode material. So, to prevent SnO 2 The pulverization of particles is an urgent problem to be...

Claims

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Application Information

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IPC IPC(8): H01M4/485
CPCH01M4/366H01M4/48H01M10/0525Y02E60/10
Inventor 程新群孙翠马玉林朱明华周振心杨子涵尹鸽平
Owner HARBIN INST OF TECH
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