Inorganic-organic nano composite solid electrolyte membrane and preparation method and application thereof

A solid electrolyte and nanocomposite technology, which is used in solid electrolytes, electrolyte battery manufacturing, non-aqueous electrolytes, etc., to achieve high Coulomb efficiency and cycle life, reduce interface resistance, and inhibit lithium dendrites.

Active Publication Date: 2019-04-16
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently developed solid-state electrolytes cannot simultaneously satisfy the "hardness" required by the lithium metal negative electrode to suppress lithium dendrites and the "soft" required by the positive electrode for good interfacial contact.

Method used

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  • Inorganic-organic nano composite solid electrolyte membrane and preparation method and application thereof
  • Inorganic-organic nano composite solid electrolyte membrane and preparation method and application thereof
  • Inorganic-organic nano composite solid electrolyte membrane and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0035] (1) Preparation of Li by solid-state reaction method 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) Inorganic ceramic solid electrolyte powder. Lithium carbonate (Li 2 CO 3 ), aluminum oxide (Al 2 o 3 ), titanium dioxide (TiO 2 ), ammonium monohydrogen phosphate ((NH 4 ) 2 HPO 4 ) and grind to mix. In order to compensate for the loss of lithium salt in the heat treatment process, lithium carbonate is in excess of 10%. After sintering at 900 °C for 2 h, ball milling at 400 rpm for 6 h with acetone as solvent, then calcining at 900 °C for 2 h and ball milling for 6 h to obtain LATP powder. (2) Polyethylene oxide (PEO, molecular weight 400,000) and lithium salt (LiTFSI) were vacuum-dried at 60 °C and 100 °C overnight before use, and then 3 g of PEO and 1 g of LiTFSI were dissolved in 40 mL of acetonitrile (AN) , mechanically stirred at 60°C for 12 h, and then coated on the washed polymer non-woven PET, dried at 60°C and rolled to obtain an interface layer thickness of a...

Embodiment 2

[0037] (1) Preparation of Li by solid-state reaction method 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) Inorganic ceramic solid electrolyte powder. Lithium carbonate (Li 2 CO 3 ), aluminum oxide (Al 2 o 3 ), titanium dioxide (TiO 2 ), ammonium monohydrogen phosphate ((NH 4 ) 2 HPO 4 ) and grind to mix. In order to compensate for the loss of lithium salt in the heat treatment process, lithium carbonate is in excess of 10%. After sintering at 900 °C for 2 h, ball milling at 400 rpm for 12 h with acetone as solvent, then calcining at 900 °C for 2 h and ball milling for 12 h to obtain LATP powder. (2) Polyethylene oxide (PEO, molecular weight 400,000) and lithium salt (LiTFSI) were vacuum-dried at 60 °C and 100 °C overnight before use, and then 3 g of PEO and 1 g of LiTFSI were dissolved in 40 mL of acetonitrile (AN) , mechanically stirred at 60 °C for 12 h, and then coated on the washed polymer non-woven PET, dried at 60 °C and then rolled to obtain an interface layer thick...

Embodiment 3

[0039] (1) Preparation of Li by solid-state reaction method 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) Inorganic ceramic solid electrolyte powder. Lithium carbonate (Li 2 CO 3 ), aluminum oxide (Al 2 o 3 ), titanium dioxide (TiO 2 ), ammonium monohydrogen phosphate ((NH 4 ) 2 HPO 4 ) and grind to mix. In order to compensate for the loss of lithium salt in the heat treatment process, lithium carbonate is in excess of 10%. After sintering at 900 °C for 2 h, ball milling at 400 rpm for 6 h with acetone as solvent, then calcining at 900 °C for 2 h and ball milling for 6 h to obtain LATP powder. (2) Polyethylene oxide (PEO, molecular weight 400,000) and lithium salt (LiTFSI) were vacuum-dried at 60 °C and 100 °C overnight before use, and then 3 g of PEO and 1 g of LiTFSI were dissolved in 40 mL of acetonitrile (AN) , mechanically stirred at 60 °C for 12 h, and then coated on the washed polymer non-woven PET, dried at 60 °C and then rolled to obtain an interface layer thickne...

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Abstract

The present invention discloses an inorganic-organic nano composite solid electrolyte membrane and a preparation method and application thereof. The composite solid electrolyte is a novel inorganic-organic nanocomposite combining the respective advantages of inorganic ceramic solid electrolyte and organic polymer electrolyte and is composed of a negative electrode protective layer, a support layerand a positive electrode interface layer. The support layer plays a supporting role, and the main component of the negative electrode protective layer is the inorganic solid electrolyte with good mechanical properties, which can effectively inhibit the growth of lithium dendrite; and the positive electrode interface layer is mainly composed of organic polymer electrolyte with good flexibility, ensures good contact with active materials and provides a continuous ion transport channel. In the present invention, the composite solid electrolyte with good interface compatibility is prepared by coating on both sides of the support layer, and the process is simple and efficient. The composite solid electrolyte can effectively inhibit dendritic crystal and reduces interface resistance so that a solid lithium metal battery has higher energy density and longer cycle life.

Description

technical field [0001] The present invention relates to an inorganic-organic nanocomposite solid-state electrolyte diaphragm and its preparation method and application, in particular to an inorganic-organic nanocomposite solid-state electrolyte diaphragm having good interface compatibility with both positive and negative electrodes, its preparation method and its solid-state Applications in lithium metal batteries. The invention belongs to the technical field of electrolyte membrane and battery application. Background technique [0002] The rapid development of new energy electric vehicles and portable electronic devices has greatly promoted the social demand for energy storage systems with high safety and high specific energy. Among many anode materials, lithium metal is due to its low density (0.59 g cm -3 ), the theoretical specific capacity is extremely high (3860 mAh g −1 ) and low electrode potential (–3.040 V vs. SHE), making it the best choice for anode materials....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0082Y02P70/50
Inventor 王俊中赵政
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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