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Method for preparing lithium ion battery cathode material Nb2O5 and Li2O doped tellurium and vanadium glass

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, negative electrodes, secondary batteries, etc., to achieve the effects of shortening the experimental period, good application prospects, and simple production process

Inactive Publication Date: 2019-04-12
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for preparing lithium ion battery negative electrode material Nb for the existing problems of traditional lithium ion batteries. 2 o 5 and Li 2 O-doped tellurium vanadium glass method, the obtained lithium ion battery negative electrode material, because the glass has the advantages of open network structure and no grain boundary, the prepared negative electrode material has more excellent cycle stability and high capacity, thus has important economic and environmental benefits

Method used

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  • Method for preparing lithium ion battery cathode material Nb2O5 and Li2O doped tellurium and vanadium glass
  • Method for preparing lithium ion battery cathode material Nb2O5 and Li2O doped tellurium and vanadium glass
  • Method for preparing lithium ion battery cathode material Nb2O5 and Li2O doped tellurium and vanadium glass

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1: TeO 2 :V 2 o 5 :Nb 2 o 5 : Li 2 O=63:27:5:5 molar ratio;

[0030] The specific preparation steps of a lithium ion battery negative electrode material prepared by melt quenching are as follows:

[0031] The first step is to accurately weigh tellurium oxide (TeO 2 ): 6.0381 g, vanadium pentoxide (V 2 o 5 ): 2.9436 g, niobium pentoxide (Nb 2 o 5 ): 0.7967 g, lithium oxide (Li 2 O): 0.2216 g;

[0032] In the second step, the above-mentioned mixture is fully ground in a mortar, placed in an alumina crucible, melted in an air atmosphere, shaped, annealed, cooled, and finally a glass is obtained. The melting temperature is 900 °C and the holding time is 30 min. The annealing temperature is 250°C and the annealing time is 2 h. The XRD pattern of the prepared sample shows that the sample is amorphous and glass. It can be seen from the DSC pattern that with the doping of Nb 2 o 5 and Li 2 The higher the O content, the higher the glass transition temperat...

Embodiment 2

[0035] Example 2: TeO 2 :V 2 o 5 :Nb 2 o 5 : Li 2 O=56:24:10:10 molar ratio;

[0036] The first step is to accurately weigh tellurium oxide (TeO 2 ): 5.3563 g, vanadium pentoxide (V 2 o 5 ): 2.6162 g, niobium pentoxide (Nb 2 o 5 ): 1.5901 g, lithium oxide (Li 2 O): 0.4424 g;

[0037] In the second step, the above-mentioned mixture is fully ground in a mortar, placed in an alumina crucible, melted in an air atmosphere, shaped, annealed, cooled, and finally a glass is obtained. The melting temperature is 900 °C and the holding time is 30 min. Annealing temperature 250℃, annealing time 2 h;

[0038] In the third step, prepare according to the method in the third step of Example 1.

[0039] The negative electrode material prepared by using the above examples is charged and discharged at a charge and discharge voltage of 0.01-3.0 V and a current density of 1000 mA / g. The specific capacity of the first discharge is 72.3 mA h / g. After 1000 cycles, the specific capacity o...

Embodiment 3

[0040] Example 3: TeO 2 :V 2 o 5 :Nb 2 o 5 : Li 2 O=49:21:15:15 molar ratio;

[0041] Step 1: Accurately weigh tellurium oxide (TeO 2 ): 4.6772 g, vanadium pentoxide (V 2 o 5 ): 2.2802 g, niobium pentoxide (Nb 2 o 5 ): 2.3804 g, lithium oxide (Li 2 O): 0.6622 g;

[0042] Step 2: Grind the above-mentioned mixture fully in a mortar, put it in an alumina crucible, melt it in an air atmosphere, shape it, anneal it, cool it, and finally get a glass. The melting temperature is 900°C and the holding time is 30 minutes. The annealing temperature was 250°C, and the annealing time was 2 h.

[0043] The 3rd step, prepare according to the method for the 3rd step of embodiment 1;

[0044] The negative electrode material prepared by using the above examples is charged and discharged at a charge and discharge voltage of 0.01-3.0 V and a current density of 1000 mA / g. The specific capacity of the first discharge is 96.7 mA h / g. After 1000 cycles, the specific capacity of the disch...

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Abstract

The invention discloses a method for preparing lithium ion battery cathode material Nb2O5 and Li2O doped tellurium and vanadium glass. The method comprises the following steps that: firstly, mixing niobium pentoxide, lithium oxide, vanadium pentoxide and tellurium oxide, and carrying out full grinding; then, transferring to an aluminum oxide crucible, and carrying out fusion thermal insulation ina muffle furnace; and finally, carrying out annealing on the fused glass in an annealing furnace to eliminate internal stress. The obtained sample is grinded into powder, and the powder is subjected to thermodynamics researching. Then, one part of samples is subjected to high energy ball milling with acetylene black and binder for preparing a lithium ion battery cathode, and the electrochemical performance of the sample is researched and represented. By use of the method, the problems of the low cycling stability and safety of a traditional lithium ion battery can be effectively solved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a battery using Nb 2 o 5 and Li 2 O-doped tellurium vanadium glass preparation method for lithium ion battery negative electrode. Background technique [0002] Energy is the foundation of the national economy and plays an important role in guaranteeing and promoting the development of human society. With the increasingly serious energy crisis and environmental pollution, the development of new energy technologies to replace traditional energy is of great significance to the sustainable development of human society. Among the existing diversified energy storage devices, lithium-ion batteries are considered to be the most promising in the 21st century because of their high energy density, long cycle life, minimal memory effect, low self-discharge effect, and no pollution to the environment. Potential electrochemical energy storage devices. At present, the development trend...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M10/0525
CPCH01M4/364H01M4/485H01M10/0525H01M2004/027Y02E60/10
Inventor 张艳飞范家慧
Owner QILU UNIV OF TECH
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