Piezoelectric-driven self-charged battery diaphragm and preparation method thereof

A piezoelectric drive, battery diaphragm technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of low porosity of composite films and hinder lithium ion transmission, so as to facilitate transmission and enhance piezoelectricity. Response to electric potential, easy-to-operate effect

Inactive Publication Date: 2017-09-22
SOUTHEAST UNIV
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  • Abstract
  • Description
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Problems solved by technology

The PZT nanoparticles selected as the piezoelectric phase composite in this paper can improve the piezoelectric output of SCPC to a certain extent, but the porosity of the composite film is not high, and the doping of nano-microspheres will hinder lithium ions to a certain extent. transport in thin films
[0005] In 2015, Li Cheng proposed a method for preparing short BCT-BZT nanofibers by electrospinning (LiCheng, Miaomiao Yuan, Long Gu etc. Wireless power-free and implantable nanosystem for resistance-based biodetection. Nano Energy (2015) 15, 598–606), but the relationship between the grinding time of short fibers and fiber length, the relationship between fiber ratio and film porosity, and the influence of composite film thickness are not involved.
At present, there is no report on the use of BCT-BZT piezoelectric fiber and PVDF polymer composite piezoelectric film for piezoelectric-driven self-rechargeable batteries at home and abroad.

Method used

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  • Piezoelectric-driven self-charged battery diaphragm and preparation method thereof
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  • Piezoelectric-driven self-charged battery diaphragm and preparation method thereof

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specific Embodiment approach 1

[0032] Embodiment 1: In this embodiment, the method for preparing the PVDF / BCT-BZT piezoelectric composite film used for piezoelectrically driven self-rechargeable batteries is carried out according to the following steps:

[0033] Step 1, adopt conventional sol-gel method to prepare composition and be 0.5 (Ba 0.7 Ca 0.3 ) TiO 3 -0.5Ba(Ti 0.8 Zr 0.2 )O 3 (abbreviated as BCT-BZT) sol;

[0034] Step 2, performing electrospinning and heat treatment operations on the sol obtained in step 1 to make it a BCT-BZT piezoelectric fiber;

[0035] Step 3. Manually crush the piezoelectric fiber obtained in step 2, and then grind it for 0.5-1.5 hours, so that the length of the fiber rod is 5-6um;

[0036] Step 4, dissolve the BCT-BZT piezoelectric short fiber and PVDF powder obtained in step 3 in DMF solvent, control the mass percentage of piezoelectric material BCT-BZT in the mixed solution to 10-30%, and stir 0.5-1.5% by magnetic force h, make the solution mix uniformly;

[0037] ...

specific Embodiment approach 2

[0043] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the piezoelectric fiber is ground for 1 hour in step 3, and the others are the same as Embodiment 1.

specific Embodiment approach 3

[0044] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 4, the mass percentage of the piezoelectric material BCT-BZT in the mixed solution is controlled to be 20%. Others are the same as those in the first or second embodiment.

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Abstract

The invention provides a piezoelectric-driven self-charged battery diaphragm and a preparation method thereof. The diaphragm is a PVDF / BCT-BZT piezoelectric composite film which comprises a fibrous piezoelectric material BCT-BZT and a polymer PVDF; BCT-BZT is 0.5(Ba0.7Ca0.3)TiO3-0.5Ba(Ti0.8Zr0.2)O3, and PVDF is polyvinylidene fluoride. The preparation method comprises the steps of preparing the 0.5(Ba0.7Ca0.3)TiO3-0.5Ba(Ti0.8Zr0.2)O3 (for short, BCT-BZT) nano-fiber by adopting an electro-spinning method and regarding the BCT-BZT nano-fiber as a piezoelectric phase to be compounded in the film so as to obtain a PVDF / BCT-BZT nanometer composite film with a porous structure. According to the preparation method, the fibrous lead-free piezoelectric material BCT-BZT and a traditional SCPC diaphragm material PVDF are compounded and modified, so that the composite diaphragm has more holes and higher piezoelectric response potential than the pure PVDF film, and accordingly, the piezoelectric, self-charging and electrochemical performances of the SCPC are improved remarkably.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a PVDF / BCT-BZT piezoelectric composite film used for piezoelectrically driven self-charging battery diaphragms and a preparation method of the film Background technique [0002] In 2012, the research team composed of Xue Xinyu and Wang Sihong, under the leadership of Professor Wang Zhonglin from the Georgia Institute of Technology, proposed a new structural mechanism for the first time. This new mechanism combines the two processes of energy conversion and energy storage into one step. accomplish. They used ingenious device structure design to fuse the two structures of nanogenerator and lithium battery into one device unit—self-charging power cell (self-charging power cell, abbreviated as SCPC). This self-charging energy unit can directly use the mechanical vibration or deformation in the surrounding environment to complete the process of self-power genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/46
CPCH01M10/46H01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 王增梅韦桂
Owner SOUTHEAST UNIV
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