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Method for preparing graphene/lithium iron phosphate composite anode materials

A composite positive electrode material, lithium iron phosphate technology, applied in the field of materials science, can solve problems such as poor electrochemical performance, and achieve the effects of excellent electrochemical performance, good electrical conductivity and electrochemical performance

Inactive Publication Date: 2016-09-28
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned technical problems in the prior art, the invention provides a kind of preparation method of graphene / lithium iron phosphate composite positive electrode material, the preparation method of described this graphene / lithium iron phosphate composite positive electrode material should solve existing In the lithium iron phosphate / graphene composite material in technology, the wrapping effect of graphene on lithium iron phosphate / carbon is only a physical mixing effect, and the technical problem of poor electrochemical performance

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  • Method for preparing graphene/lithium iron phosphate composite anode materials
  • Method for preparing graphene/lithium iron phosphate composite anode materials
  • Method for preparing graphene/lithium iron phosphate composite anode materials

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Embodiment 1

[0021] A preparation method of graphene / lithium iron phosphate composite positive electrode material, the raw materials required for its preparation are calculated in parts by mass, and its composition and consumption are as follows:

[0022] 7.6 parts of lithium hydroxide;

[0023] 50 parts of ferrous sulfate;

[0024] 20.7 parts of phosphoric acid;

[0025] 4000 parts of 3mg / mL graphene oxide solution;

[0026] 14.2 parts of ethylenediamine;

[0027] Firstly, lithium hydroxide, ferrous sulfate and phosphoric acid are dissolved in the graphene oxide solution, then ethylenediamine is added, and stirred evenly. Then, the mixed solution was placed in a polytetrafluoroethylene reactor for hydrothermal reaction at 220° C. for 12 hours. During the hydrothermal reaction process, under the catalysis of ethylenediamine, lithium iron phosphate particles are reacted, and graphene oxide microsheets self-assemble and the precipitated lithium iron phosphate particles are tightly wrappe...

Embodiment 2

[0032] A preparation method of graphene / lithium iron phosphate composite positive electrode material, the raw materials required for its preparation are calculated in parts by mass, and its composition and consumption are as follows:

[0033] 14.5 parts of lithium nitrate;

[0034] 84.8 parts of ferric nitrate;

[0035] Phosphoric acid 24.2 parts;

[0036] 4000 parts of 3mg / mL graphene oxide solution;

[0037] 16.6 parts of ethylenediamine;

[0038] First, lithium nitrate, iron nitrate and phosphoric acid are dissolved in the graphene oxide solution, then ethylenediamine is added, and stirred evenly. Then the mixed solution was placed in a polytetrafluoroethylene reactor for hydrothermal reaction at 160° C. for 8 hours. During the hydrothermal reaction process, under the catalysis of ethylenediamine, lithium iron phosphate particles are reacted, and graphene oxide microsheets self-assemble and the precipitated lithium iron phosphate particles are tightly wrapped between the ...

Embodiment 3

[0043] A preparation method of graphene / lithium iron phosphate composite positive electrode material, the raw materials required for its preparation are calculated in parts by mass, and its composition and consumption are as follows:

[0044] 16.5 parts of lithium acetate;

[0045] 43.5 parts of ferrous acetate;

[0046] 28.8 parts of phosphoric acid;

[0047] 4000 parts of 3mg / mL graphene oxide solution;

[0048] 19.4 parts of ethylenediamine;

[0049] First, dissolve lithium acetate, ferrous acetate and phosphoric acid in the graphene oxide solution, then add ethylenediamine, and stir evenly. Then, the mixed solution was placed in a polytetrafluoroethylene reactor for hydrothermal reaction at 160° C. for 16 hours. During the hydrothermal reaction process, under the catalysis of ethylenediamine, lithium iron phosphate particles are reacted, and graphene oxide microsheets self-assemble and the precipitated lithium iron phosphate particles are tightly wrapped between the se...

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Abstract

The invention discloses a method for preparing graphene / lithium iron phosphate composite anode materials. The method includes weighing lithium sources, iron sources and phosphate radical sources; adding the lithium sources, the iron sources and the phosphate radical sources into graphene oxide solution; carrying out hydrothermal reaction under the catalytic effects of ethanediamine to obtain graphene / lithium iron phosphate precursor materials; calcining the graphene / lithium iron phosphate precursor materials at the high temperatures of 400-800 DEG C in protective atmosphere of argon for 2-8 hours in high-temperature calcinations procedures to obtain the graphene / lithium iron phosphate composite anode materials. A molar ratio of the lithium sources to the iron sources to the phosphate radical sources is 1:1:1. The method has the advantages that the specific discharge capacity of the graphene / lithium iron phosphate composite anode materials prepared by the aid of the method is 150.9 mAh / g under 1C conditions, and the capacity retention ratio of the graphene / lithium iron phosphate composite anode materials is 97.4% after 50 charge-discharge cycles; the graphene / lithium iron phosphate composite anode materials are excellent in electrochemical performance, and accordingly the method hopefully can be industrially applied.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to a positive electrode material, in particular to a preparation method of a graphene / lithium iron phosphate composite positive electrode material. Background technique [0002] Since Goodenough et al first reported that lithium iron phosphate with an olivine structure could be used as a lithium battery in 1997, lithium iron phosphate cathode materials have attracted widespread attention and a lot of research. Lithium iron phosphate has a theoretical specific capacity of 170mAh / g and a 3.5V charging platform for lithium, which is different from traditional LiCoO 2 and LiMn 2 o 4 Compared with lithium battery materials, it has the advantages of wide source of raw materials, low cost, no environmental pollution, good cycle performance, good thermal stability, and outstanding safety performance. It is an ideal cathode material for power lithium-ion batteries. However, due to the poo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 常程康杜亚辉陈雪平郭倩丰平肖鹏关利
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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