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Composite solid electrolyte film based on NASICON type electrolyte and preparation method thereof

A solid electrolyte and electrolyte technology, applied in non-aqueous electrolyte batteries, solid electrolytes, non-aqueous electrolytes, etc., can solve the problems of poor compatibility, large room temperature polarization, and low ionic conductivity of polymer-based solid electrolytes

Pending Publication Date: 2020-10-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of the poor compatibility between the rigid inorganic solid electrolyte and the electrode interface, the low ion conductivity of the polymer-based solid electrolyte, and the large room temperature polarization of the LATP-based all-solid-state lithium battery with a polymer interface layer, which requires high temperature In order to solve the technical problems of the operation, a composite solid electrolyte film based on NASICON type electrolyte and its preparation method are provided

Method used

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  • Composite solid electrolyte film based on NASICON type electrolyte and preparation method thereof
  • Composite solid electrolyte film based on NASICON type electrolyte and preparation method thereof
  • Composite solid electrolyte film based on NASICON type electrolyte and preparation method thereof

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specific Embodiment approach 1

[0048] Specific embodiment one: a kind of composite solid electrolyte film based on NASICON type electrolyte of the present embodiment is made of 0.2g Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) solid electrolyte powder, 0.6g of PVDF and 0.2g of LiTFSI were prepared by solution casting method.

[0049] The method for preparing the composite solid electrolyte film based on NASICON type electrolyte as described in the first embodiment is carried out in the following steps:

[0050] 1. Add 0.2g of Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) Ultrasonic dispersion of solid electrolyte powder in 2mL of N,N-dimethylformamide, ultrasonic 10h, to obtain a solid electrolyte dispersion;

[0051] 2. ①In a stirring state, add 0.6g of PVDF (molecular weight Mw=400000g / mol) into 3mL of N,N-dimethylformamide, heat and stir at 60°C for 12h to obtain a polymer solution;② Under stirring, add 0.2g of LiTFSI to 1mL of N,N-dimethylformamide, heat and stir at 60°C for 6h to obtain a lithium salt solut...

specific Embodiment approach 2

[0060] Specific embodiment two: a kind of composite solid electrolyte film based on NASICON type electrolyte of the present embodiment is made of 0.2g Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) solid electrolyte powder, 0.6g of PVDF-HFP and 0.2g of LiTFSI were prepared by solution casting method.

[0061] The method for preparing the composite solid electrolyte film based on the NASICON type electrolyte as described in the second embodiment is carried out in the following steps:

[0062] 1. Add 0.2g of Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) Ultrasonic dispersion of solid electrolyte powder in 2mL of N,N-dimethylformamide, ultrasonic 10h, to obtain a solid electrolyte dispersion;

[0063] 2. ① Under stirring, add 0.6g of PVDF-HFP (molecular weight Mw=400000g / mol) into 3mL of N,N-dimethylformamide, heat and stir at 60°C for 12h to obtain a polymer solution ; ②Under stirring, add 0.2g of LiTFSI to 1mL of N,N-dimethylformamide, heat and stir at 60°C for 6h to obtain a lithium ...

specific Embodiment approach 3

[0067] Specific embodiment three: a kind of composite solid electrolyte film based on NASICON type electrolyte of the present embodiment is made of 0.25g Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) solid electrolyte powder, 0.6g of PVDF and 0.4g of LiTFSI were prepared by solution casting method.

[0068] The method for preparing the composite solid electrolyte film based on the NASICON type electrolyte as described in the third embodiment is carried out in the following steps:

[0069] 1. Add 0.25g of Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) Ultrasonic dispersion of solid electrolyte powder in 2.5mL of N,N-dimethylformamide, ultrasonic 10h, to obtain a solid electrolyte dispersion;

[0070] 2. ①In a stirring state, add 0.6g of PVDF (molecular weight Mw=400000g / mol) into 3mL of N,N-dimethylformamide, heat and stir at 60°C for 12h to obtain a polymer solution;② Under stirring, add 0.4g of LiTFSI to 2mL of N,N-dimethylformamide, heat and stir at 60°C for 6h to obtain a lithium ...

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Abstract

The invention discloses a composite solid electrolyte film based on NASICON type electrolyte and a preparation method thereof. The invention belongs to the field of all-solid-state lithium batteries.The objective of the invention is to solve technical problems of poor compatibility between a rigid inorganic solid electrolyte and an electrode interface, too low ionic conductivity of a polymer-based solid electrolyte, and large room-temperature polarization and operation at a high temperature of an LATP-based all-solid-state lithium battery with a polymer interface layer in the prior art. The product is prepared from NASICON type solid electrolyte powder, a polymer and a lithium salt through a solution casting method. The method comprises the following steps: 1, adding solid electrolyte powder, a polymer and a lithium salt into a solvent, and performing stirring to form a uniform slurry; 2, coating a glass plate substrate with the slurry, and performing drying to obtain a composite solid electrolyte film; and 3, infiltrating the composite solid electrolyte film in an electrolyte, sucking the electrolyte on the surface of the electrolyte film, and performing vacuum drying to obtain the composite solid electrolyte.

Description

technical field [0001] The invention belongs to the field of all-solid-state lithium batteries; in particular, it relates to a composite solid-state electrolyte film based on a NASICON type electrolyte and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in energy storage devices due to their high energy density and cycle life. However, traditional lithium-ion batteries use flammable liquid organic electrolytes, which pose risks of leakage, combustion, and explosion. Most electrolytes cannot match the high-voltage cathode materials, which will decompose and produce gas under high voltage, which leads to the liquid system using graphite anodes approaching the upper limit of its energy density. The uneven lithium deposition and the growth of lithium dendrites on the surface of the lithium electrode can pierce the separator and cause a short circuit of the battery, which limits the use of metallic lithium anodes in liquid system...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/052
CPCH01M10/056H01M10/052H01M2300/0065Y02E60/10
Inventor 熊岳平金英敏李栋刘超军贾政刚宗鑫付梦雨
Owner HARBIN INST OF TECH
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