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Preparation method of flexible thin film lithium ion pole plate

A flexible film, lithium ion technology, applied in the field of lithium ion batteries, can solve the problems of low load uniformity of active materials, limited active material loading, difficult and uniform dispersion of nanofibers and carbon nanotubes, etc., to reduce contact resistance. , easy separation and recycling, improve the effect of electrochemical activity and flexibility

Inactive Publication Date: 2018-08-17
柔电(武汉)科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

However, the current preparation of active material / carbon nanotube / nanofiber electrodes generally adopts the method of impregnation / filtration and then drying. The biggest disadvantage of this method is the low loading of active material and the uniformity of the mixing of components. The main reason is that the limited pores in the nanofiber / carbon nanotube scaffold can accommodate the active material, which limits the loading of the active material; The large polarity difference makes it difficult for nanofibers and carbon nanotubes to disperse uniformly in general solvents, especially in systems with high solid content, this poor dispersion state is very obvious

Method used

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  • Preparation method of flexible thin film lithium ion pole plate
  • Preparation method of flexible thin film lithium ion pole plate
  • Preparation method of flexible thin film lithium ion pole plate

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preparation example Construction

[0025] see figure 1 , the embodiment of the present invention provides a method for preparing a flexible thin-film lithium ion pole piece, comprising the following steps: S1, prepare a carbon nanotube solution in advance, and simultaneously prepare a nanofiber solution in an alkali solution; S2, put the active material into the In the carbon nanotube solution, the two are fully mixed to obtain a mixed solution; S3, the nanofiber solution is put into the mixed solution, and the two are fully mixed to obtain a mixed slurry; S4, the mixed slurry The material is poured into the mold and placed in a coagulation bath to obtain a flexible thin film pole piece. In this embodiment, the nanofibers are first dissolved into a molecular chain state by an alkaline solution, and then the active material and carbon nanotubes are mixed, and the nanofibers are regenerated after passing through a coagulation bath. Not only can a pole piece with a high load of active material be prepared, but als...

Embodiment 1

[0033] Embodiment 1, concrete operation steps are as follows:

[0034] a. Weigh 0.5g of nanofibers (NF) in 100mL of NaOH / Urea aqueous solution, and stir at -12°C to obtain a nanofiber solution;

[0035] b. Weigh 0.5g of carbon nanotubes (CNTs, with a diameter of 20-40nm) in 100mL of deionized water, and obtain a carbon nanotube dispersion after ultrasonic dispersion;

[0036] c, weigh 9g lithium cobaltate (LiCoO 2 ) was added to the carbon nanotube aqueous solution and stirred for 30min to make LiCoO 2 Mix well with CNTs to get LiCoO 2 and CNTs mixture;

[0037] d, The nanofiber solution was added dropwise to LiCoO 2And in the CNTs mixture, continue stirring for 1h to obtain lithium cobaltate / carbon nanotube / nanofiber (LCO / CNTs / NF) mixed slurry;

[0038] e, inject the LCO / CNTs / NF mixed slurry into the mold (area 12cm*12cm, PTFE square concave plate with a depth of 200μm), place it in the coagulation bath for 120s to regenerate the nanofibers, and obtain flexible cobalt af...

Embodiment 2

[0040] Embodiment 2, concrete operation steps are as follows:

[0041] a. Weigh 0.75g of nanofibers (NF) in 100mL of NaOH / Urea aqueous solution, and stir at -12°C to obtain a nanofiber solution;

[0042] b. Weigh 0.75g of carbon nanotubes (CNTs, with a diameter of 20-40nm) in 100mL of deionized water, and obtain a carbon nanotube dispersion after ultrasonic dispersion;

[0043] c, weigh 8.5g lithium cobaltate (LiCoO 2 ) was added to the carbon nanotube aqueous solution and stirred for 30min to make LiCoO 2 Mix well with CNTs to get LiCoO 2 and CNTs mixture;

[0044] d, The nanofiber solution was added dropwise to LiCoO 2 And in the CNTs mixture, continue stirring for 1h to obtain lithium cobaltate / carbon nanotube / nanofiber (LCO / CNTs / NF) mixed slurry;

[0045] e, inject the LCO / CNTs / NF mixed slurry into the mold (area 12cm*12cm, PTFE square concave plate with a depth of 200μm), place it in the coagulation bath for 120s to regenerate the nanofibers, and obtain flexible coba...

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Abstract

The invention relates to the technical field of a lithium ion battery, and provides a preparation method of a flexible thin film lithium ion pole plate. The preparation method comprises the steps of S1, preparing a carbon nanotube solution in advance, and simultaneously preparing a nanometer fiber solution in an alkali solution; S2, placing an active substance into a carbon nanotube solution, andmaking the active substance and the carbon nanotube solution fully mixed to obtain a mixed solution; S3, placing the nanometer fiber solution into the mixed solution, and making the nanometer fiber solution and the mixed solution fully mixed to obtain mixed paste; and S4, injecting the mixed paste into a die, and placing the mixed paste in coagulating bath for processing to obtain the flexible thin film pole plate. The nanometer fiber is dissolved to a form of a molecule chain by employing a sodium hydroxide / urea system, and the flexible thin film pole plate with uniformly-distributed carbon nanotube tubes and active substance is prepared by a regeneration method after coagulating bath; and an excellent transmission path can be provided for electrons / ions by a structure in which each constituent in the electrode is continuously distributed, the contact impedance among the constituents is reduced, so that the electrochemical activity and the flexibility of the electrode are improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing flexible thin-film lithium-ion pole pieces. Background technique [0002] Since Sony commercialized lithium-ion batteries in 1991, most of the reports so far are still about the electrode materials and structures of traditional lithium-ion batteries, which seriously restricts the innovation and application of lithium-ion batteries. At the same time, in today's smart energy era, with the outbreak of the flexible industrial chain, the demand for flexible lithium-ion batteries is increasing. Therefore, it is imperative to develop high-performance flexible lithium-ion batteries. [0003] Nanofibers have been widely used in the field of lithium-ion batteries due to their light weight, low cost and reusability. regions, porous current collectors, and diaphragms. Generally speaking, a hybrid system of nanofibers and carbon nanotubes is used for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/139H01M4/04H01M10/0525
CPCH01M4/0433H01M4/139H01M4/1391H01M10/0525Y02E60/10
Inventor 龙佳胡韬解明
Owner 柔电(武汉)科技有限公司
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