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Preparation method of cobalt diiron tetraoxide-carbon cloth lithium battery anode material

A technology of cobalt ferrite and negative electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficulty in meeting the needs of high specific energy lithium-ion batteries, limited discharge specific capacity, and small theoretical specific capacity. To achieve the effects of outstanding cycle stability, simplified manufacturing process, and high capacity

Active Publication Date: 2017-03-22
HEILONGJIANG UNIV
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  • Abstract
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Problems solved by technology

At present, the commercialized materials are mainly graphitized carbon materials, but their theoretical specific capacity is small, which is difficult to meet the needs of high specific energy lithium-ion batteries.
Transition metal compounds have received people's attention due to their high specific capacity. Metal compounds used in lithium-ion battery anode materials include oxides, sulfides, nitrides, etc. At present, transition metal oxides are more researched, such as different Morphology of SnO 2 , Fe 2 o 3 、Co 3 o 4 and TiO 2 and their composites with graphene materials, however, these materials have limited discharge capacity

Method used

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  • Preparation method of cobalt diiron tetraoxide-carbon cloth lithium battery anode material

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preparation example Construction

[0039] The preparation method of the lithium battery negative electrode material of cobalt ferrate-carbon cloth of the present invention, comprises the following steps: provide a Prussian blue solution, the raw material of described Prussian blue solution comprises cobalt salt and ferricyanide; impregnating the carbon cloth with the blue solution to obtain a precursor / carbon cloth composite material; and performing heat treatment on the precursor / carbon cloth composite material.

[0040] The above term "Prussian blue" has the chemical formula Fe 7 (CN) 18 14H 2 O, or as Fe 4 [Fe(CN) 6 ] 3 ·nH 2 O, the chemical name is (OC-6-11)-hexacyanoferrate (4-) iron (3+) (3:4), also known as Berlin blue, tribute blue, iron blue, Milori blue, Asia Ferricyanide, Chinese blue, Miroli blue, Hualan.

[0041] Among the raw materials of the above-mentioned Prussian blue solution, the mass ratio of cobalt salt and ferricyanide salt is preferably 1:4 to 2:1, such as 1:4, 1:3.8, 1:3.5, 1:3, ...

Embodiment 1

[0063] Step 1. Pretreatment of carbon cloth activation. Specifically, the carbon cloth was first added to a hydrochloric acid solution with a concentration of 10wt% at a temperature of 90°C for 1 hour; then washed with deionized water and acetone respectively, and then dried at 70°C for 3 hours for later use.

[0064] Step 2, preparation of Prussian blue precursor. Specifically, according to the ratio, that is, the mass ratio of cobalt salt to iron salt is 2:3, the mass ratio of cobalt salt to water is 1:60, the mass ratio of iron salt to water is 1:75, and the surfactant and iron The mass ratio of salt is 1:0.7. Dissolve a certain amount of cobalt chloride and potassium ferrocyanide in deionized water respectively. After the two water solutions are mixed together, add a surfactant and stir for 4 hours to obtain a Prussian blue solution.

[0065] Step 3, preparation of the composite material. Specifically, pour the Prussian blue solution obtained in step 2 into a hydrotherma...

Embodiment 2

[0068] Step 1. Pretreatment of carbon cloth activation. Specifically, the carbon cloth was first added to a hydrochloric acid solution with a concentration of 5wt%, at a temperature of 85°C, and treated for 1.5h; then washed with deionized water and acetone, and then dried at 65°C for 5h for later use.

[0069] Step 2, preparation of Prussian blue precursor. Specifically, according to the ratio, that is, the mass ratio of cobalt salt to iron salt is 1:4, the mass ratio of cobalt salt to water is 1:50, the mass ratio of iron salt to water is 1:80, and the surfactant and iron The mass ratio of salt is 1:0.3. Dissolve a certain amount of cobalt chloride and potassium ferrocyanide in deionized water respectively, mix the two water solutions together, add a surfactant and stir for 4 hours to obtain a Prussian blue solution.

[0070] Step 3, preparation of the composite material. Specifically, pour the Prussian blue solution obtained in step 2 into a hydrothermal kettle, then imm...

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Abstract

The invention discloses a preparation method of a cobalt diiron tetraoxide-carbon cloth lithium battery anode material. The preparation method comprises the following steps: providing a Berlin blue solution, wherein raw materials of the Berlin blue solution comprise a cobalt salt and an iron-cyanide salt; using the Berlin blue solution to soak carbon cloth so as to obtain a precursor / carbon cloth composite material; and carrying out heat treatment on the precursor / carbon cloth composite material. According to the preparation method disclosed by the invention, the composite material that CoFe2O4 is grown on a carbon cloth substrate is prepared in an in-situ manner. The manufacturing process of the electrode can be simplified, a direct electron transfer path between an active material and a current collector is provided, and meanwhile huge volume expansion in the lithium intercalation and deintercalation process can be relieved. The cobalt diiron tetraoxide-carbon cloth lithium battery anode material can serve as a lithium battery anode without a binding agent, and the lithium battery anode material has relatively high capacity, outstanding cycle stability and excellent rate capability. Meanwhile, the anode material can be used for assembling a flexible lithium ion battery, and can be applied to more fields.

Description

technical field [0001] The invention relates to the technical field of lithium ion electrode materials, in particular to a method for preparing a lithium battery negative electrode material of cobalt tetraoxoferrate-carbon cloth. Background technique [0002] In the rapidly developing modern society, especially today when traditional energy sources such as oil, coal, and natural gas are increasingly depleted, a new generation of batteries, as an environmentally friendly new energy source, has attracted widespread attention. Lithium-ion batteries, mercury-free alkaline zinc-manganese batteries, fuel cells, metal hydride nickel batteries and solar batteries are the most ideal green and environmentally friendly power sources in the 21st century, and the battery industry will also become one of the ten most promising energy pillar industries . For lithium-ion batteries, on the basis of the gradual maturity of production technology, its production cost is also declining. With t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/48
CPCH01M4/131H01M4/1391H01M4/48Y02E60/10
Inventor 王蕾付宏刚王颖于鹏刘旭
Owner HEILONGJIANG UNIV
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