A kind of composite fiber negative electrode material and preparation method thereof

A technology of composite fiber and negative electrode material, applied in the direction of negative electrode, fiber chemical characteristics, battery electrode, etc., can solve the problems of reducing energy density of energy storage device, interface mismatch capacity attenuation, binder instability, etc., to improve the structure Stability, improve cycle stability, improve the effect of high rate performance

Active Publication Date: 2020-09-25
广州航盛新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the analysis found that transition metal oxides and TiO 2 Belonging to different types of negative electrode materials, they will be subjected to specific conditions during the intercalation / delithiation process 2 Much larger volume expansion and contraction, with the charge and discharge cycle between the two may lead to high interfacial stress concentration, or even interface separation, eventually leading to the destruction of the composite electrode structure, this interface mismatch may be the reason for most composite electrodes The main reason for the rapid capacity decay during cycle charge and discharge
At the same time, transition metal oxides and TiO 2 They are all semi-conductors with low conductivity. When used, they must be coated on metal foil with a large amount of conductive carbon and binder. Carbon and metal foil occupy a certain weight and volume in the electrode, which reduces the storage capacity to a certain extent. The energy density of the energy device, and the binder is unstable under high voltage, and the active material is easy to fall off after repeated charge and discharge, which affects the cycle performance of the battery

Method used

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  • A kind of composite fiber negative electrode material and preparation method thereof
  • A kind of composite fiber negative electrode material and preparation method thereof
  • A kind of composite fiber negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Dissolve 2g of ferric nitrate and 3.75g of tetrabutyl titanate in 5g of N,N dimethylformamide, stirring continuously until completely dissolved to form A solution; then dissolve 4g of polyacrylonitrile with a molecular weight of 150,000 in 28g Form B solution in N,N dimethylformamide; slowly drop A solution into B solution, and stir until the mixture is uniform.

[0029] (2) Prepare the precursor fiber by using the general electrospinning method from the mixed solution, the feeding speed is 0.5ml / h, the voltage is 22kV, the humidity is controlled at 40%, the temperature is kept at 25°C, the distance between the nozzle and the receiver It is 15cm.

[0030] (3) The precursor fiber sample was clamped and fixed by two graphite plates, and calcined in nitrogen at 750°C for 3 hours to obtain the iron titanate / titanium dioxide / activated carbon composite fiber negative electrode material.

[0031] Depend on figure 1 XRD and figure 2 SEM results show that the prepared co...

Embodiment 2

[0033] (1) Dissolve 1g of ferric nitrate and 8.45g of tetrabutyl titanate in 10g of N,N dimethylacetamide, stirring continuously until completely dissolved to form A solution; then dissolve 10g of polyacrylonitrile with a molecular weight of 150,000 in 40g Form B solution in N,N dimethylacetamide; slowly drop A solution into B solution, and stir until the mixture is uniform.

[0034] (2) Prepare the precursor fiber by using the general electrospinning method from the mixed solution, the feeding speed is 0.5ml / h, the voltage is 22kV, the humidity is controlled at 40%, the temperature is kept at 25°C, the distance between the nozzle and the receiver 15cm;

[0035] (3) The precursor fiber was directly calcined at 700° C. for 5 hours in nitrogen to obtain the iron titanate / titanium dioxide / activated carbon composite fiber negative electrode material.

[0036] The prepared composite fiber negative electrode material is composed of iron titanate, titanium dioxide, and activated car...

Embodiment 3

[0038] (1) Dissolve 2g of ferric nitrate and 3.1g of tetrabutyl titanate in 5g of acetonitrile, stirring continuously until completely dissolved to form A solution; then 5g of polyacrylonitrile with a molecular weight of 150,000 is dissolved in 30g of acetonitrile to form B solution; Slowly add solution A to solution B dropwise and stir until evenly mixed.

[0039] (2) Prepare the precursor fiber by using the general electrospinning method from the mixed solution, the feeding speed is 0.5ml / h, the voltage is 22kV, the humidity is controlled at 40%, the temperature is kept at 25°C, the distance between the nozzle and the receiver 15cm;

[0040] (3) The precursor fiber was directly calcined at 750° C. for 1 hour in nitrogen to obtain the iron titanate / titanium dioxide / activated carbon composite fiber negative electrode material.

[0041] The prepared composite fiber negative electrode material is composed of iron titanate, titanium dioxide, and activated carbon three-phase comp...

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Abstract

Belonging to the technical field of lithium ion battery negative electrode materials, the invention specifically relates to an iron titanate / titanium dioxide / activated carbon composite fiber negative electrode material and a preparation method thereof. According to the invention, a transition metal titanate is utilized to substitute transition metal oxide for compounding with titanium dioxide so as to form long-range continuous fiber, the electrode structural stability, electronic conductivity and lithium ion diffusion ability are improved, and the high rate performance and cyclic stability of the material are greatly improved. The prepared iron titanate / titanium dioxide / activated carbon composite fiber negative electrode material can be directly used as a lithium ion battery self-support negative electrode, has no need for a current collector, a binder and the traditional electrode preparation process, at the same time gives consideration to interface matching of different phases in the electrode, high conductivity and other requirements, and meets the high specific volume and high power characteristics of lithium ion battery negative electrode materials.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to an iron titanate / titanium dioxide / activated carbon composite fiber negative electrode material and a preparation method thereof. Background technique [0002] High energy density and power density are the urgent needs of lithium-ion batteries in large-scale energy storage, electric vehicles and other fields. Graphite, as the current commercial lithium-ion battery anode material, is limited in power battery applications due to its small capacity, low ionic conductivity, and safety issues caused by lithium dendrites easily generated during cycling at low voltage. Therefore, the development of anode materials with high capacity, high power, long life, and good safety has become one of the problems that must be solved in the related research of lithium-ion batteries. [0003] Combining different types of electrode materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M10/0525D01F8/18
CPCD01F8/18H01M4/362H01M4/48H01M4/52H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 景茂祥李井泉翟洪爱张骥邢晓桐沈湘黔
Owner 广州航盛新材料科技有限公司
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