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Li2ZnTi3O8/C nanocomposite synthesized by sol-gel method in one step and application of Li2ZnTi3O8/C nanocomposite

A technology of nanocomposite and sol-gel method, which is applied in the field of Li2ZnTi3O8/C nanocomposite and its preparation, to achieve excellent cycle performance, low cost and excellent performance

Inactive Publication Date: 2012-11-07
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Li 4 Ti 5 o 12 The theoretical capacity of graphite is only half of that of graphite and its lithium intercalation potential is high, so the development of negative electrode materials with good cycle performance and high capacity is still the focus of research in this field
[0003] There is no one-step synthesis of Li by using a sol-gel method. 2 ZnTi 3 o 8 / C nanocomposites and related literature reports on their applications in lithium batteries

Method used

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  • Li2ZnTi3O8/C nanocomposite synthesized by sol-gel method in one step and application of Li2ZnTi3O8/C nanocomposite
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  • Li2ZnTi3O8/C nanocomposite synthesized by sol-gel method in one step and application of Li2ZnTi3O8/C nanocomposite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] One-step synthesis of Li by sol-gel method 2 ZnTi 3 o 8 The carbon mass content in the / C nanocomposite is 3.5%. The Li 2 ZnTi 3 o 8 / C nanocomposites are submicron secondary particles formed by the accumulation of primary particles with a particle size between 15-30nm.

[0015] One-step synthesis of Li by a sol-gel method 2 ZnTi 3 o 8 / C nanocomposite method, 3mmol of isopropyl titanate, 1mmol of Li 2 CO 3 2H 2 O, 1mmol of (CH 3 COO) 2 Zn·2H 2 O and 10mL of ethanol were stirred in a water bath at 70°C to form a gel, and then the gel was calcined in an argon atmosphere at 700°C for 3 hours to obtain Li 2 ZnTi 3 o 8 / C nanocomposites.

[0016] One-step synthesis of Li by sol-gel method 2 ZnTi 3 o 8 / C nanocomposite application, lithium battery assembly: by mass ratio Li 2 ZnTi 3 o 8 / C: polyvinylidene fluoride: acetylene black = 80:10:10 mixed and ground and evenly coated on 0.25 cm 2 The positive electrode is made on the copper sheet, the referen...

Embodiment 2

[0018] One-step synthesis of Li by sol-gel method 2 ZnTi 3 o 8 The carbon mass content in the / C nanocomposite is 3.5%. The Li 2 ZnTi 3 o 8 / C nanocomposites are submicron secondary particles formed by the accumulation of primary particles with a particle size between 15-30nm.

[0019] One-step synthesis of Li by a sol-gel method 2 ZnTi 3 o 8 / C nanocomposite method, 3mmol of isopropyl titanate, 1mmol of Li 2 CO 3 2H 2 O, 1mmol of (CH 3 COO) 2 Zn·2H 2 O and 10mL of ethanol were stirred in a water bath at 70°C to form a gel, and then the gel was calcined in an argon atmosphere at 750°C for 3 hours to obtain Li 2 ZnTi 3 o 8 / C nanocomposites.

[0020] One-step synthesis of Li by sol-gel method 2 ZnTi 3 o 8 / C nanocomposite application, lithium battery assembly: by mass ratio Li 2 ZnTi 3 o 8 / C: polyvinylidene fluoride: acetylene black = 80:10:10 mixed and ground and evenly coated on 0.25 cm 2 The positive electrode is made on the copper sheet, the referen...

Embodiment 3

[0022] One-step synthesis of Li by sol-gel method 2 ZnTi 3 o 8 The carbon mass content in the / C nanocomposite is 3.5%. The Li 2 ZnTi 3 o 8 / C nanocomposites are submicron secondary particles formed by the accumulation of primary particles with a particle size between 15-30nm.

[0023] One-step synthesis of Li by a sol-gel method 2 ZnTi 3 o 8 / C nanocomposite method, 6mmol of isopropyl titanate, 2mmol of Li 2 CO 3 2H 2 O, 2mmol of (CH 3 COO) 2 Zn·2H 2 O and 20mL of ethanol were stirred in a water bath at 70°C to form a gel, and then the gel was calcined in an argon atmosphere at 700°C for 3 hours to obtain Li 2 ZnTi 3 o 8 / C nanocomposites.

[0024] One-step synthesis of Li by sol-gel method 2 ZnTi 3 o 8 / C nanocomposite application, lithium battery assembly: by mass ratio Li 2 ZnTi 3 o 8 / C: polyvinylidene fluoride: acetylene black = 80:10:10 mixed and ground and evenly coated on 0.25 cm 2 The positive electrode is made on the copper sheet, the referenc...

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Abstract

The invention discloses a Li2ZnTi3O8 / C nanocomposite synthesized by a sol-gel method in one step as well as a preparation method and application of the Li2ZnTi3O8 / C nanocomposite. The content of carbon is 3.5% in the Li2ZnTi3O8 / C nanocomposite. The Li2ZnTi3O8 / C nanocomposite is applied to a lithium battery, so that the excellent cycle performance and the higher specific capacity are shown. The specific capacity of the Li2ZnTi3O8 / C nanocomposite can be 290mAhg<-1> after the Li2ZnTi3O8 / C nanocomposite ciculates for 100 times at the electric current density of 0.2Ag<-1>, and the specific capacity of the Li2ZnTi3O8 / C nanocomposite can be 220mAhg<-1> after the Li2ZnTi3O8 / C nanocomposite ciculates for 100 times at the electric current density of 1Ag<-1>. The invention firstly provides a preparation method of the Li2ZnTi3O8 / C nanocomposite synthesized by the sol-gel method in one step. The Li2ZnTi3O8 / C nanocomposite provided by the invention is simple and easy to operate, low in cost, high in purity and good in performance, and can be synthesized largely.

Description

technical field [0001] The invention belongs to the field of battery materials, in particular to a Li battery synthesized in one step by a sol-gel method 2 ZnTi 3 o 8 / C nanocomposite and its preparation method and application. Background technique [0002] The core of lithium-ion batteries is lithium storage materials. Graphite is currently the anode material widely used in commercial Li-ion batteries. However, the lithium intercalation potential of graphite is low, and lithium metal deposition may be caused on the surface of graphite during charging and discharging, which poses certain safety hazards. Recently, spinel Li 4 Ti 5 o 12 And its related titanium oxide compounds have become more promising negative electrode materials due to their good cycle performance, non-toxicity, safety and other advantages. But Li 4 Ti 5 o 12 The theoretical capacity of graphite is only half of that of graphite and its lithium intercalation potential is high, so the development o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/485H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 魏明灯徐玉霞
Owner FUZHOU UNIV