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Ternary positive electrode plate compounded with polytriphenylamine as well as preparation method and application of ternary positive electrode plate

A technology of polytriphenylamine and electrode sheets, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems not related to cycle performance, and achieve the effects of improving charge transfer ability, high energy density, increasing rate performance and cycle performance

Pending Publication Date: 2022-02-25
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] CN109742397A discloses a preparation method of polytriphenylamine positive electrode material. The specific process is to use polytriphenylamine as the positive electrode active material, fully stir and mix with conductive agent acetylene black, add binder PVDF after dry mixing and stirring, and dry mix After stirring evenly, N-methylpyrrolidone is added to form a positive electrode slurry, and then coated on an aluminum foil to prepare a positive electrode of polytriphenylamine. Aniline cathode material, no rate performance involved
CN111525101A discloses a preparation method of a composite cathode material, using nitrogen-rich melamine as a carbon source to coat LiFePO 4 , the introduction of nitrogen atoms enhanced the LiFePO 4 Conductivity, but not cycle performance

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  • Ternary positive electrode plate compounded with polytriphenylamine as well as preparation method and application of ternary positive electrode plate
  • Ternary positive electrode plate compounded with polytriphenylamine as well as preparation method and application of ternary positive electrode plate

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Experimental program
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Effect test

Embodiment 1

[0042] The ternary cathode material adopts Li(Ni 0.5 co 0.2 mn 0.3 )O 2 , The purity is 99%, polytriphenylamine adopts the powder raw material with the purity of 99%.

[0043] This embodiment provides a polytriphenylamine-coated ternary positive electrode sheet and a lithium-ion battery thereof, the preparation method of which is as follows:

[0044] (1) The ternary cathode material Li(Ni 0.5 co 0.2 mn 0.3 )O 2 Mix the conductive agent Super P and the binder polyvinylidene fluoride to prepare the positive electrode material slurry, and evenly coat the prepared positive electrode material slurry on the aluminum foil and dry it at 125°C to obtain the electrode sheet. Among them, the ternary positive electrode active material The weight percentage content of the conductive agent is 96%, the weight percentage content of the conductive agent is 2%, the weight percentage content of the binder is 2%, and the coating surface density is 325g / dm 2 .

[0045] (2) Dissolving poly...

Embodiment 2

[0049] This embodiment provides a polytriphenylamine-coated ternary positive electrode sheet and a lithium-ion battery thereof, the preparation method of which is as follows:

[0050] (1) The ternary cathode material Li(Ni 0.5 co 0.2 mn 0.3 )O 2 Mix the conductive agent Super P and the binder polyvinylidene fluoride to prepare the positive electrode material slurry, and evenly coat the prepared positive electrode material slurry on the aluminum foil and dry it at 125°C to obtain the electrode sheet. Among them, the ternary positive electrode active material The weight percentage content of the conductive agent is 96%, the weight percentage content of the conductive agent is 2%, the weight percentage content of the binder is 2%, and the coating surface density is 325g / dm 2 .

[0051] (2) Dissolving polytriphenylamine in N-methylpyrrolidone solvent, and ultrasonically stirring, so that the solid content of the solution is controlled at 3 wt%, and a polytriphenylamine solutio...

Embodiment 3

[0055] This embodiment provides a polytriphenylamine-coated ternary positive electrode sheet and a lithium-ion battery thereof, the preparation method of which is as follows:

[0056] (1) The ternary cathode material Li(Ni 0.5 co 0.2 mn 0.3 )O 2 Mix the conductive agent Super P and the binder polyvinylidene fluoride to prepare the positive electrode material slurry, and evenly coat the prepared positive electrode material slurry on the aluminum foil and dry it at 125°C to obtain the electrode sheet. Among them, the ternary positive electrode active material The weight percentage content of the conductive agent is 96%, the weight percentage content of the conductive agent is 2%, the weight percentage content of the binder is 2%, and the coating surface density is 325g / dm 2 .

[0057] (2) Dissolving polytriphenylamine in N-methylpyrrolidone solvent, and ultrasonically stirring, so that the solid content of the solution is controlled at 10 wt%, to prepare a polytriphenylamine...

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Abstract

The invention provides a ternary positive electrode plate compounded with polytriphenylamine as well as a preparation method and application of the ternary positive electrode plate. The preparation method comprises the following steps of mixing a ternary positive electrode active material, a conductive agent and a binder to obtain a positive electrode material electrode plate, and then coating the surface of the positive electrode material electrode plate with a polytriphenylamine solution to obtain the ternary positive electrode plate compounded with polytriphenylamine. The preparation process of the composite polytriphenylamine ternary positive electrode plate is simple, has low requirements on environment and equipment, and is suitable for industrial manufacturing. Meanwhile, the polytriphenylamine material can effectively reduce the impedance of the positive electrode material by forming a conductive network, and the ternary positive electrode plate compounded with the polytriphenylamine is applied to a lithium ion battery system, so that the rate capability and the cycle performance of a lithium ion battery are favorably improved.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a ternary positive electrode sheet composited with polytriphenylamine and a preparation method and application thereof. Background technique [0002] Polytriphenylamine (PTPAn) material not only has a high specific capacity (~100mAh / g), a high discharge voltage platform (3.5~4.0V), but also has a good conductive framework and anion adsorption effect, making it a good cathode material. At the same time, the PTPAn material mainly uses the adsorption effect to realize anion transport and charge transfer, and there is no solid-phase transport process of ions in the traditional positive electrode material, so the charge transfer resistance of the PTPAn material is almost zero. However, the energy density of PTPAn materials needs to be further improved, and there are certain limitations as a cathode material alone. [0003] Ternary cathode material Li[Ni x co y mn (1-x-y) ]O 2...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/60H01M4/62H01M4/131H01M10/0525
CPCH01M4/1391H01M4/606H01M4/624H01M4/131H01M10/0525Y02E60/10
Inventor 林文佳徐悦斌曾汉民何巍刘金成
Owner EVE ENERGY CO LTD