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Polymer solid electrolyte and preparation method thereof

A solid electrolyte and polymer technology, used in composite electrolytes, electrolyte battery manufacturing, non-aqueous electrolyte batteries, etc., can solve the problems of inability to rapidly transmit lithium ions, defective performance, and poor ion conductivity, and improve thermal stability. and electrochemical stability, good electrochemical stability and thermal stability, the effect of reducing energy efficiency and service life

Inactive Publication Date: 2020-09-01
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, existing PVDF-based polymer electrolytes are still deficient in performance
For example, PVDF has a high degree of crystallinity and a high proportion of crystalline regions, which leads to the inability of lithium ions to be transported quickly in the PVDF matrix, and poor ion conductivity; PVDF can react with lithium metal negative electrodes, and the by-products of the reaction lead to electrolyte and lithium metal The interface contact becomes, and the polarization of the battery increases, and the interface stability is poor; the contact reaction between PVDF and lithium metal leads to a lower electrochemical window; because PVDF cannot withstand the heat generated by thermal runaway, its thermal stability is poor, There are security risks

Method used

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  • Polymer solid electrolyte and preparation method thereof
  • Polymer solid electrolyte and preparation method thereof
  • Polymer solid electrolyte and preparation method thereof

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Experimental program
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Embodiment approach

[0061] According to some embodiments provided by the present invention, the preparation method of the polymer solid electrolyte includes:

[0062] Stirring and mixing the polymer matrix, lithium salt and inorganic filler in an organic solvent to obtain a slurry;

[0063] The above slurry was cast into a mold and dried in vacuum to obtain a polymer solid electrolyte.

[0064] According to some embodiments provided by the present invention, the polymer matrix is ​​PVDF or a mixture of PVDF and PEO.

[0065] According to some embodiments provided by the present invention, when the polymer matrix is ​​a mixture of PVDF and PEO, the mass ratio of PEO to PVDF is 1:3-25, for example: 1:5, 1:6, 1:7 , 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1 :20, 1:21, 1:22, 1:23, 1:24, 1:25, etc.

[0066] In some embodiments, when the polymer matrix is ​​a mixture of PVDF and PEO, the mass ratio of PEO to PVDF is 1:3-15.

[0067] According to some embodiments provide...

Embodiment 1

[0098] Preparation of 3(5PVDF-PEO)-(LTTBA-3LiTFSI)-0.1ZnO polymer solid electrolyte, in which the ratio of matrix (PVDF-PEO) to lithium salt (LTTBA-3LiTFSI) is 3:1, ZnO and polymer solid electrolyte The ratio of the total mass (matrix + lithium salt + ZnO) is 0.1:1, the mass ratio of PVDF to PEO is 5:1, and the mass ratio of LTTBA to LiTFSI is 1:3.

[0099] Weigh 1g LTTBA, 3g LiTFSI, 10g PVDF, 2g PEO and 1.78g ZnO in 150mL DMAC solvent, stir at 30°C for 6h to obtain a polymeric solid electrolyte slurry, and then cast the slurry in a polytetrafluoroethylene mold for self-leveling , transferred to a vacuum drying oven, and dried in vacuum at 30° C. for 24 hours to obtain a polymer solid electrolyte of 3(5PVDF-PEO)-(LTTBA-3LiTFSI)-0.1ZnO.

[0100] Cut the obtained polymer solid electrolyte into discs with a diameter of 15 mm and a thickness of about 170 μm, and conduct an AC impedance test on it, and the results are as follows figure 1 As shown, its impedance value is about 260Ω...

Embodiment 2

[0102] 5(9PVDF-PEO)-(LTTBA-LiClO 4 )-0.15LAGP polymer solid electrolyte, in which the matrix (PVDF-PEO) and lithium salt (LTTBA-LiClO 4 ) ratio is 5:1, the ratio of LAGP to the total mass of polymer solid electrolyte (matrix + lithium salt + ZnO) is 0.1:1, the mass ratio of PVDF to PEO is 9:1, LTTBA to LiClO 4 The mass ratio is 1:1.

[0103] Weigh 1g LTTBA, 1gLiClO 4 , 9g PVDF, 1gPEO and 2.12gLAGP in 170mL acetonitrile solvent, stirred at 30°C for 12h to obtain a polymerized solid electrolyte slurry, then cast the slurry in a polytetrafluoroethylene mold for self-leveling, transfer it to a drying oven, and Purged and dried with nitrogen at 30°C for 18 h to obtain 5(9PVDF-PEO)-(LTTBA-LiClO 4 )-0.15LAGP polymer solid electrolyte.

[0104] Cut the obtained polymer solid electrolyte into discs with a diameter of 15 mm and a thickness of about 136 μm, and conduct an AC impedance test on it, and the results are as follows figure 2 As shown, it can be seen from the calculation ...

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Abstract

The invention discloses a polymer solid electrolyte and a preparation method thereof. The polymer solid electrolyte comprises a polymer matrix, a lithium salt and an inorganic filler, wherein the polymer matrix is PVDF or a mixture of PVDF and PEO, the lithium salt comprises a lithium salt A, and the lithium salt A is lithium tri-tert-butoxy aluminum hydride (LTTBA) or lithium triethylborohydride(LTEB) or a mixture of the LTTBA and the LTEB. The invention also discloses a preparation method of the polymer solid electrolyte. A lithium battery containing the polymer solid electrolyte has the excellent cycle performance and rate capability and good interface stability.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a polymer solid electrolyte containing a novel lithium salt and a preparation method thereof. Background technique [0002] Lithium secondary batteries have many advantages such as no memory effect, high volume specific capacity, high working voltage, wide temperature range, low self-discharge rate, long cycle life, etc. The energy field has very good application prospects. However, the currently widely used lithium secondary batteries all use liquid organic small molecule electrolytes, which may cause safety hazards of explosion under abnormal conditions such as overcharging and internal short circuits. In recent years, lithium battery safety accidents have frequently exploded, indicating that the safety problem of lithium secondary batteries has become a technical bottleneck restricting its wider and deeper application. The further development of lithium sec...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0565H01M10/058H01M10/0525H01M2300/0088Y02E60/10Y02P70/50
Inventor 陈步天余意何凤荣
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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