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Lithium ion battery anode composite material and its preparation method

A technology for lithium-ion batteries and composite materials, which is applied in the field of lithium-ion battery cathode composite materials containing ferric fluoride and its preparation, and can solve the adverse effects of battery electrode materials on electrochemical performance, difficult removal of surfactants, and easy presence of CTAB, etc. problem, to achieve the effect of obvious charging and discharging platform, good cycle ability and high conductivity

Inactive Publication Date: 2014-02-05
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the surfactant is difficult to remove, resulting in the residual CTAB in the final product, and CTAB will adversely affect the electrochemical performance of the battery electrode material.

Method used

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  • Lithium ion battery anode composite material and its preparation method
  • Lithium ion battery anode composite material and its preparation method
  • Lithium ion battery anode composite material and its preparation method

Examples

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preparation example Construction

[0020] see figure 1 , the embodiment of the present invention provides a kind of preparation method of lithium-ion battery cathode composite material, it comprises the following steps:

[0021] S1: provide a carbon nanotube raw material and a HF solution;

[0022] S2: Dispersing the carbon nanotube raw material in the HF solution to form a first suspension;

[0023] S3: provide a FeCl 3 solution, and the FeCl 3 The solution is mixed with the first suspension to obtain a precipitate FeF 3 ?3H 2 O-CNTs; and

[0024] S4: Separating and purifying the precipitate, and heat-treating the precipitate, so as to obtain the lithium-ion battery cathode composite material.

[0025] In step S1, the carbon nanotube raw material can be one or more of single-walled carbon nanotubes, double-walled carbon nanotubes or multi-walled carbon nanotubes. The inner diameter of the carbon nanotube is preferably 2 nm to 15 nm, the outer diameter is 10 nm to 30 nm, and the length is about several h...

Embodiment 1

[0032] Add 200 mg of carbon nanotubes into 80 mL of HF (38% by mass) aqueous solution, and ultrasonically disperse for 2 hours to obtain the first suspension; 27.027 g of FeCl 3 .6H 2 O was dissolved in 20 mL deionized water to obtain FeCl 3 solution; under magnetic stirring conditions, the FeCl 3 The solution was added dropwise into the first suspension, and magnetic stirring was continued for 10 h to obtain a mixed solution containing a precipitate; the mixed solution was filtered, and the precipitate was dried at 60° C. for 10 h, and the precipitate was Heat treatment in Ar atmosphere at 125°C for 10h to obtain FeF 3 -CNTs cathode composite material.

Embodiment 2

[0034] Add 300 mg of carbon nanotubes into 40 mL of HF (38% by mass) aqueous solution, and ultrasonically disperse for 1 h to obtain the first suspension; 40.54 g of FeCl 3 .6H 2 O was dissolved in 40 mL deionized water to obtain FeCl 3 solution; under magnetic stirring conditions, the FeCl 3 The solution was added dropwise into the first suspension, and magnetic stirring was continued for 10 h to obtain a mixed solution containing a precipitate; the mixed solution was filtered, and the precipitate was dried at 60° C. for 10 h, and the precipitate was at 130°C in N 2 Heat treatment in the atmosphere for 10h to obtain FeF 3 -CNTs cathode composite material.

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Abstract

The invention relates to a lithium ion battery anode composite material, which comprises a plurality of iron fluoride particles and a plurality of carbon nanotubes. The plurality of iron fluoride particles and the plurality of carbon nanotubes form a three-dimensional conductive network, wherein the plurality of carbon nanotubes are uniformly dispersed among the plurality of iron fluoride particles, and at least parts of the iron fluoride particles are connected through the carbon nanotubes. The invention also provides a preparation method of the anode composite material. The method comprises the steps of: providing a carbon nanotube raw material and an HF solution; dispersing the carbon nanotube raw material in the HF solution to form a first suspension solution; providing an FeCl3 solution, and mixing the FeCl3 solution with the first suspension solution to obtain a precipitate FeF3.3H2O-CNTs; and subjecting the precipitate to separation and purification, and carrying out heat treatment on the precipitate, thereby obtaining the lithium ion battery anode composite material.

Description

technical field [0001] The invention relates to a lithium ion battery cathode composite material and a preparation method thereof, in particular to a lithium ion battery cathode composite material containing ferric fluoride and a preparation method thereof. Background technique [0002] At present, with the continuous expansion of lithium-ion battery applications, such as new energy storage and electric vehicles, the market demand for high-power, high-energy-density batteries is increasing. Ferric fluoride (FeF 3 ) has attracted extensive attention because of its high theoretical energy density and excellent high-temperature thermal stability. [0003] However, due to the FeF 3 The conductivity of LiF is low, and the non-conductivity of the conversion reaction product LiF during the charge and discharge process makes the kinetic process of the conversion reaction very slow. The above factors limit the FeF 3 Practical applications in Li-ion batteries. [0004] At present...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCH01M4/364H01M4/582H01M4/583H01M10/0525H01M4/136H01M4/1397H01M4/625Y02E60/10
Inventor 张艳丽王莉何向明赵鹏
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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