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NixFe1-xS2 solid solution cathode material and preparation method thereof

A technology of nixfe1-xs2, cathode material, applied in the field of NixFe1-xS2 solid solution cathode material and its preparation, can solve the problems of difficult to control phase structure, difficult to use in commercial production, etc. Effect

Inactive Publication Date: 2020-08-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Difficult to control FeS during synthesis due to hydrothermal or solvothermal methods 2 phase structure, and super toxic H is produced during the synthesis process 2 S gas, making the method difficult to apply to commercial production

Method used

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  • NixFe1-xS2 solid solution cathode material and preparation method thereof
  • NixFe1-xS2 solid solution cathode material and preparation method thereof
  • NixFe1-xS2 solid solution cathode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] A kind of Ni x Fe 1-x S 2 Solid solution positive electrode material, its preparation method comprises the following steps:

[0035] (1) Add nickel acetate, iron oxalate and 0.5g PAN to 10ml DMF in turn, wherein the molar ratio of nickel acetate and iron oxalate is 1:5, and stir at 500r / min for 12 hours at 25°C to obtain Uniformly dispersed spinning solution;

[0036] (2) Spin the spinning solution obtained in step (1) into nanofibers distributed with NiFe precursor by electrospinning method, then raise the temperature to 1000° C. for 3 hours at a heating rate of 10° C. / min, and collect samples after cooling;

[0037] (3) mixing the nanofibers obtained in step (2) with nano S to obtain a mixture, wherein the molar ratio of NiFe precursor to nano S is 1:3;

[0038] (4) Vulcanize the mixture in step (3) after sealing: the temperature is 500°C, the heating rate is 5°C / min, and the time is 3h. 2 , deionized water, and ethanol, and dried at 80°C for 12 hours to obtain a...

Embodiment 2

[0041] A kind of Ni x Fe 1-x S 2 Solid solution positive electrode material, its preparation method comprises the following steps:

[0042] (1) Add nickel acetate, iron oxalate and 0.5g PAN to 10ml DMF in turn, wherein the molar ratio of nickel acetate and iron oxalate is 1:7, then stir at 25°C at a stirring speed of 500r / min for 12h to obtain uniform dispersion spinning solution;

[0043] (2) By electrospinning, the spinning solution obtained in step (1) is spun into nanofibers distributed with NiFe precursors, and then heated at a rate of 10°C / min to 1000°C for 3 hours, and samples are collected after cooling;

[0044] (3) mixing the nanofibers obtained in step (2) with nano S to obtain a mixture, wherein the molar ratio of NiFe precursor to nano S is 1:5;

[0045] (4) Vulcanize the product of step (3) after sealing: the temperature is 500°C, the heating rate is 5°C / min, and the time is 4h. 2 , deionized water, and ethanol, and dried at 80°C for 12 hours to obtain a pow...

Embodiment 3

[0048] A kind of Ni x Fe 1-x S 2 Solid solution positive electrode material, its preparation method comprises the following steps:

[0049] (1) Add cobalt acetate, ferric oxalate and 0.5g PAN to 10ml DMF in sequence, wherein the molar ratio of cobalt acetate and ferric oxalate is 1:9, then stir at 500r / min at 25°C for 12h to obtain dispersion Uniform spinning solution;

[0050] (2) Spin the spinning solution obtained in step (1) into nanofibers distributed with NiFe precursor by electrospinning method, heat at 1000°C for 3 hours at a heating rate of 10°C / min, and collect samples;

[0051] (3) uniformly mixing the nanofibers obtained in step (2) with nano S in a molar ratio of 1:3 to obtain a mixture;

[0052] (4) Vulcanize the product of step (3) after sealing: the temperature is 450°C, the heating rate is 5°C / min, and the time is 3h. 2 , deionized water, and ethanol, and dried at 80°C for 12 hours to obtain a powder.

[0053] A kind of lithium secondary battery, uses ab...

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Abstract

The invention provides a preparation method of a NixFe1-xS2 solid solution cathode material, which comprises the following steps: dissolving a nickel salt, a ferric salt and PAN in an organic solvent,and continuously stirring to form a uniformly dispersed spinning solution; spinning the spinning solution into nanofibers uniformly distributed with NiFe precursors by utilizing electrostatic spinning, and then carbonizing under the condition of 800-1200 DEG C; and uniformly mixing the carbonized nano-fibers with S powder, and performing tube sealing vulcanization to obtain the carbon nano-fibers. The NixFe1-xS2 solid solution positive electrode material has the advantage of low capacity attenuation speed, and can effectively solve the problem of quick capacity attenuation of an existing FeS2positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of cathode materials, in particular to a Ni x Fe 1-x S 2 Solid solution cathode material and preparation method thereof. Background technique [0002] With the rapid development of metal lithium anodes and solid electrolytes, low-capacity cathodes are the main bottleneck limiting the further development of commercial lithium secondary batteries, and a cathode material with high energy density is urgently needed for lithium batteries. FeS 2 Because its synthetic materials are mainly Fe and S sources, it has the advantages of cheap price, simple synthesis, and high theoretical specific capacity (up to 894mAh g) among many positive electrode materials. -1 ) and other advantages, it is the best choice as anode material for high energy density batteries. [0003] Although FeS 2 It has been commercialized as a primary battery electrode material, but there are still some problems to be solved in the applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58D01F9/10D01F11/00D01D5/00H01M10/0525
CPCD01D5/003D01F9/10D01F11/00H01M4/04H01M4/5815H01M10/0525H01M2004/028Y02E60/10
Inventor 王丽平李莉牛晓滨
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA