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Fluorinated graphene with carbonyl fluoride semi-ionic bonds and lithium battery positive pole material

A technology of fluorinated graphene and positive electrode materials, applied in graphene, battery electrodes, positive electrodes, etc., can solve problems such as reducing specific energy performance

Inactive Publication Date: 2018-02-23
XIAMEN INST OF RARE EARTH MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] People have reduced the content of fluorine by controlling the degree of fluorination (such as the atomic ratio of fluorine to carbon is lower than 0.5), or by coating the surface with conductive materials such as carbon materials, oxide vanadate or conductive polymers such as polyaniline, polypyrrole, etc. It is a good way to increase the conductivity of fluorinated carbon materials and improve their power performance, but these methods will reduce the actual specific energy performance of the material. How to achieve high specific energy properties while obtaining high specific power performance has a great impact on fluorinated Carbon material structure design requirements

Method used

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  • Fluorinated graphene with carbonyl fluoride semi-ionic bonds and lithium battery positive pole material
  • Fluorinated graphene with carbonyl fluoride semi-ionic bonds and lithium battery positive pole material
  • Fluorinated graphene with carbonyl fluoride semi-ionic bonds and lithium battery positive pole material

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Effect test

Embodiment 1

[0025] Step 1: Put 10g of graphene raw material into the fluorination equipment, pass in the fluorination gas nitrogen trifluoride, keep the pressure at 100 kPa, and react at 430°C for 12 hours to obtain about 22.7g of fluorinated graphene, and calculate the fluorine-to-carbon ratio is 0.8;

[0026] Step 2: The electrochemical performance test of the fluorinated graphene material obtained in step 1 as a lithium battery cathode material:

[0027] 1) Working electrode: a mixed material of fluorinated graphene, acetylene black and polyvinylidene fluoride in a mass ratio of 8:1:1;

[0028] 2) Counter electrode: lithium metal sheet;

[0029] 3) Solution: 1Mol / l lithium hexafluorophosphate solution dissolved in ethylene carbonate and dimethyl carbonate (volume ratio 1:1);

[0030] 4) Discharge cut-off voltage: 1.5 V;

[0031] 5) Discharge current: 20 mA / g, 1 A / g, 2 A / g, 5 A / g, 10 A / g;

[0032] Performance results such as figure 1 As shown, the material exhibits excellent rate p...

Embodiment 2

[0035] Step 1: Put 10g of graphene raw material into the fluorination equipment, pass in fluorine gas, fluorine gas, keep the pressure at 120 kPa, and react at 350°C for 16 hours to obtain 17.9 g of fluorinated graphene, and the calculated fluorine-to-carbon ratio is 0.5 ;

[0036] Step 2: The electrochemical performance test of the fluorinated graphene material obtained in step 1 as a lithium battery cathode material:

[0037] 1) Working electrode: a mixed material of fluorinated graphene, acetylene black and polyvinylidene fluoride in a mass ratio of 8:1:1;

[0038] 2) Counter electrode: lithium metal sheet;

[0039] 3) Solution: 1Mol / l lithium hexafluorophosphate solution dissolved in ethylene carbonate and dimethyl carbonate (volume ratio 1:1);

[0040] 4) Discharge cut-off voltage: 1.5 V;

[0041] 5) Discharge current: 20 mA / g, 1 A / g, 2 A / g, 5 A / g, 10 A / g;

[0042] The result is as image 3 As shown, the material exhibits excellent rate performance, achieving a speci...

Embodiment 3

[0045] Step 1: Put 10g of graphene raw material into the fluorination equipment, pass in the fluorination gas boron trifluoride, keep the pressure at 90 kPa, and react at 500°C for 10 hours to obtain 24.1g of fluorinated graphene, in which the proportion of fluorine to carbon is about is 0.95;

[0046] Step 2: The electrochemical performance test of the fluorinated graphene material obtained in step 1 as a lithium battery cathode material:

[0047] 1) Working electrode: a mixed material of fluorinated graphene, acetylene black and polyvinylidene fluoride in a mass ratio of 8:1:1;

[0048] 2) Counter electrode: lithium metal sheet;

[0049] 3) Solution: 1Mol / l lithium hexafluorophosphate solution dissolved in ethylene carbonate and dimethyl carbonate (volume ratio 1:1);

[0050] 4) Discharge cut-off voltage: 1.5 V;

[0051] 5) Discharge current: 20 mA / g, 1 A / g, 2 A / g, 5 A / g, 10 A / g;

[0052] 3. The result is as follows Figure 5 As shown, the material exhibits good rate pe...

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Abstract

The invention discloses fluorinated graphene with carbonyl fluoride semi-ionic bonds. The fluorinated graphene is characterized in that the fluorinated graphene is prepared after graphene is fluorated, and the proportion of the semi-ion content to fluorine content in the fluorinated graphene body is 21-35%. The invention further comprises a lithium battery positive pole material. The fluorinated graphene with the carbonyl fluoride semi-ionic bonds has the advantages of high specific power and high specific energy, according to the lithium battery positive pole material of the fluorinated graphene material, discharging can be achieved under the current of 10 A / g at the highest, the specific energy is larger than 1,000 Wh / kg, the specific power is larger than 21,000 W / kg, and the fluorinatedgraphen can be applied to disposable usage of the lithium battery positive pole material.

Description

technical field [0001] The invention relates to the field of fluorinated graphene, in particular to a fluorinated graphene containing carbon-fluorine semi-ionic bonds and a lithium battery cathode material. Background technique [0002] When fluorinated carbon materials are used as anode materials for primary lithium batteries, the theoretical specific energy is as high as 2180 Wh / kg, which is currently the commercial lithium battery system with the highest specific energy. The system has a wide range of applications in aerospace, medical, and military fields that require long life and high reliability. The higher the fluorination degree of fluorinated carbon, the higher the theoretical specific capacity or specific energy, but because fluorinated carbon materials, especially those with high fluorine degree, contain strong covalent carbon-fluorine bonds, which lead to their poor performance. Electronic conductivity greatly affects the application of this material in high-po...

Claims

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Application Information

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IPC IPC(8): C01B32/184H01M4/583
CPCC01P2002/86H01M4/5835H01M2004/028Y02E60/10
Inventor 岳红军钟贵明陈慧鑫卢灿忠
Owner XIAMEN INST OF RARE EARTH MATERIALS
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