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Composite positive electrode material and preparation method thereof

A composite material and positive electrode technology, which is applied in the field of positive electrode composite materials and its preparation, can solve the problems of limited FeOF synthesis methods and achieve the effect of increasing conductivity

Active Publication Date: 2015-01-14
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The synthesis method of FeOF in the prior art is comparatively limited

Method used

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[0018] An embodiment of the present invention provides a method for preparing a positive electrode composite material, which includes the following steps:

[0019] S1, ferric fluoride (FeF 3 ) and graphene oxide are uniformly mixed in a liquid phase solvent to form a solid-liquid mixture; and

[0020] S2, the solid-liquid mixture is subjected to a hydrothermal / solvothermal reaction at 80° C. to 250° C. in a hydrothermal / solvothermal reaction kettle.

[0021] FeF 3 It may or may not contain water of crystallization, preferably contains water of crystallization, such as ferric fluoride trihydrate (FeF 3 ·3H 2 O), FeF 3 0.33H 2 O, Fe 1.9 f 4.75 0.95H 2 O, FeF 2.5 0.5H 2 O, FeF 3 ·H 2 O and amorphous FeF 3 at least one of the

[0022] The graphene oxide reacted with FeF under hydrothermal / solvothermal conditions 3 reaction, in situ generating FeOF on the surface of graphene's carbon atomic layer, and thus chemically bonded with graphene. When all the oxygen in grap...

Embodiment 1

[0038] Iron fluoride trihydrate FeF 3 ·3H 2 Preparation of O: Add 0.1g CTAB to 30mL deionized water, ultrasonically disperse; then add 18 g FeCl 3 ·6H2 O gets Fe 3+ solution; under vigorous stirring, the Fe 3+ The solution was added dropwise into HF (38%, 50 mL), and stirred for 2 h until the reaction was complete. Centrifuge and wash with ethanol until neutral, and dry the precipitate in a common oven at 60°C for 10 h to obtain iron fluoride trihydrate FeF 3 ·3H 2 O.

[0039] Preparation of graphene oxide: Graphene oxide was prepared by the Hummers method. The experimental process was as follows: 5 g of graphite, 2.5 g of sodium nitrate, and 115 mL of concentrated sulfuric acid were mixed in an ice-water bath, and stirred vigorously for 30 min; 30 g of permanganese was added to it. After stirring for 5 hours, graphite was completely oxidized; 200 mL of deionized water was added to the reactant and stirring was continued for 20 minutes, and 400 mL of deionized water and ...

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Abstract

The invention provides a composite positive electrode material. The composite positive electrode material is a graphene-FeOF composite material, and comprises FeOF particles and graphene which are combined by virtue of chemical bonds. The invention further provides a preparation method of the composite positive electrode material. The preparation method comprises the following steps: uniformly mixing ferric fluoride and graphene oxide in a liquid-phase solvent to form a solid-liquid mixture; performing hydrothermal / solvothermal reaction on the solid-liquid mixture in a hydrothermal / solvothermal reaction kettle at the temperature of 80-250 DEG C.

Description

technical field [0001] The invention relates to a positive electrode composite material based on ferric oxyfluoride and a preparation method thereof. Background technique [0002] Ferric oxyfluoride (FeOF) can be seen as replacing FeF with O 2 and formed structure. with strongly ionic FeF 2 In comparison, FeOF contains more chemical bonds Fe-O, which makes FeOF more conductive than FeF 2 (Both band gaps are 1.5 eV and 3 eV, respectively). At the same time, Fe in FeOF is +3 valence, and it can react with three electrons in the electrochemical process. The reaction in each voltage range is as follows: 2V~4.5V: Fe 3+ OF + Li = LiFe 2+ OF; 0.7V~2V: LiFe 2+ OF + 2Li = LiF + Li 2 O + Fe 0 , with a theoretical specific capacity of 885 mAh g -1 , is expected to be used as a cathode material with a large specific capacity. [0003] The synthesis method of FeOF in the prior art is relatively limited. J. G. Thompson and F. J. Brink of the Australian National University passe...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397
CPCH01M4/58H01M4/625H01M10/0525H01M4/136H01M4/1397Y02E60/10
Inventor 张艳丽王莉何向明赵鹏金玉红李建军尚玉明高剑
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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