A kind of lithium ion battery cathode material additive and its cathode material and lithium ion secondary battery

A technology for lithium ion batteries and positive electrode materials, applied in the field of electrochemistry, can solve the problems of difficult removal of impurity ions, unsuitability for mass preparation, and impact on battery performance, and achieves good market prospects, good rate performance, cycle stability, and high capacity. Effect

Active Publication Date: 2021-07-13
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, chemical oxidation is used to synthesize a large number of conductive polymers. Commonly used oxidants such as ferric ions (Fe 3+ ), persulfate (S 2 o 8 2- ) etc. to carry out oxidative polymerization, this method requires the use of a large amount of oxidizing agent (such as FeCl 3 , generally use 4 times the equivalent), and the yield is not high, lacking certain practicability
In addition, this method inevitably introduces impurity ions, and the impurity ions are not easy to remove, which will have a certain impact on the performance of the battery.
Electrochemical polymerization is also a method for synthesizing conductive polymers. The advantages of this method are rapid reaction, no introduction of other metal ions, and high purity of the prepared conductive polymers, but the operation is complicated and requires the use of a large amount of supporting electrolytes and high-purity solvents, and The polymer is only deposited on the surface of the electrode, the yield and efficiency are low, and it is not suitable for mass production

Method used

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  • A kind of lithium ion battery cathode material additive and its cathode material and lithium ion secondary battery
  • A kind of lithium ion battery cathode material additive and its cathode material and lithium ion secondary battery
  • A kind of lithium ion battery cathode material additive and its cathode material and lithium ion secondary battery

Examples

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Effect test

Embodiment 1

[0038] This embodiment is a lithium ion battery positive electrode material additive and its positive electrode and lithium secondary battery. The additive is a conductive polymer monomer unit containing a high concentration of carboxyl groups. This example selects 3-thiophene malonic acid (3TPA) for use, and reaction course is as follows figure 1 shown.

[0039] The lithiation process of the above-mentioned 3-thiophene malonate is specifically as follows:

[0040] Lithiation of 3-thiophene malonate: 0.8618g (0.01mol) 3-thiophene malonate and 0.4800g (0.02mol) lithium hydroxide (LiOH) were lithiated in solvent water, and the lithiation time was 3 hours. After the lithiation reaction was completed, the solvent was evaporated to dryness to obtain 3-thiophene malonate lithium (3TPMALi).

[0041] The preparation steps of the lithium-ion battery cathode material of the present embodiment are as follows:

[0042] 0.1402g lithium iron phosphate (LiFePO 4 ), 0.0401g acetylene black,...

Embodiment 2

[0063] This embodiment is a lithium ion battery positive electrode material additive and its positive electrode and lithium secondary battery. The additive is a conductive polymer monomer unit containing a high concentration of carboxyl groups, specifically after lithiation of 3-thiopheneacetic acid monomer Lithium 3-thiophene acetate is formed, which is then prepared by electrochemical in situ polymerization. The structural formula of the 3-thiopheneacetic acid monomer is shown in formula B in the summary of the invention.

[0064] The lithiation process of the above-mentioned 3-thiopheneacetic acid monomer is specifically as follows:

[0065] Lithiation of 3-thiopheneacetic acid monomer: 1.4205g (0.01mol) 3-thiopheneacetic acid monomer and 0.2403g (0.01mol) lithium hydroxide (LiOH) were dissolved in water for lithiation, and the lithiation time was 3 hours. After the lithiation reaction is completed, the solvent is evaporated to dryness to obtain 3-thiopheneacetic acid mono...

Embodiment 3

[0071] This embodiment is a lithium ion battery positive electrode material additive and its positive electrode and lithium secondary battery. The additive is a conductive polymer monomer unit containing a carboxyl group, specifically formed by lithiation of N-pyrrole propionic acid monomer Lithium N-pyrrole propionate is prepared by electrochemical in situ polymerization. The structural formula of the N-pyrrole propionic acid monomer is shown in formula C.

[0072] The lithiation process of the above-mentioned N-pyrrole propionic acid is specifically as follows:

[0073] Lithiation of N-pyrrolepropionic acid: Dissolve 1.3903g (0.01mol) N-pyrrolepropionic acid and 0.2401g (0.01mol) hydroxide in water for lithiation. The lithiation time is 3 hours. After the lithiation reaction is completed, Evaporate the solvent to obtain lithium N-pyrrole propionate.

[0074] The preparation steps of the lithium ion battery positive electrode material of the present embodiment are as follows:...

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Abstract

The invention relates to a lithium ion battery cathode material additive, the cathode material thereof and a lithium ion secondary battery, belonging to the technical field of electrochemistry. The lithium ion battery cathode material additive of the present invention is a conductive polymer monomer unit containing a carboxyl group, and the additive is lithiated to prepare a slurry together with a binder, a conductive agent and an active material, and then prepare an electrode sheet to assemble a battery. Such additives can be electrochemically polymerized in situ through the charging and discharging process inside the battery to form a more stable positive electrode system. Using the additive of the present invention, a conductive polymer containing a high concentration of carboxyl groups can be introduced in situ inside the battery, and the lithium iron phosphate button battery assembled by the additive has a small impedance, shows a higher specific capacity, and has a better The rate performance and cycle stability have good application prospects.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and more specifically, the present invention relates to a lithium-ion battery positive electrode material additive, and a positive electrode material coated with a conductive polymer through the in-situ polymerization of the additive and a lithium battery prepared from the positive electrode material. ion secondary battery. Background technique [0002] Lithium-ion batteries have high energy density, high efficiency, relatively light weight, and easy portability, making them the main power source for consumer electronics. Both academia and industry have invested a lot of energy to further improve the performance of lithium-ion batteries to meet the needs of future all-electric vehicles, military fields, and space fields. Although many new electrode materials with high capacity and high rate performance have been studied, the performance of batteries is still limited by traditional binde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/58H01M10/0525
CPCH01M4/366H01M4/5825H01M4/622H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 曾丹黎张斌孙玉宝陈奇刘光鹏张俊峰
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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