A solid-state polymer composite electrolyte and a preparation method and application thereof

A composite electrolyte and solid polymer technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of low ionic conductivity, poor mechanical properties, unsuitable batteries, etc., to improve ionic conductivity and reduce crystallization ability , the effect of increasing the content of the amorphous region

Inactive Publication Date: 2019-01-01
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Polyethylene oxide (PEO) has become an earlier solid polymer electrolyte material due to its good interface wettability and easy film formation. However, the ion conductivity of the polymer electrolyte formed by pure PEO and lithium salt at room temperature The rate is low, the crystallinity is high, and the mechanical properties are poor, so it is not suitable for direct use in batteries

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  • A solid-state polymer composite electrolyte and a preparation method and application thereof
  • A solid-state polymer composite electrolyte and a preparation method and application thereof
  • A solid-state polymer composite electrolyte and a preparation method and application thereof

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Embodiment 1

[0047]A solid polymer composite electrolyte (PEO-LiTFSI-5%LLTO) of the present invention is mainly composed of polyethylene oxide, lithium bistrifluoromethanesulfonylimide (LiTFSI) and quasi-one-dimensional lithium lanthanum titanyl Li 0.33 La 0.557 TiO 3 composition, wherein the molar ratio of polyethylene oxide to LiTFSI is 18:1, polyethylene oxide and quasi-one-dimensional lithium lanthanum titanyl Li 0.33 La 0.557 TiO 3 The mass ratio is 100:5.

[0048] The preparation method of the solid polymer composite electrolyte of this embodiment comprises the following steps:

[0049] (1) Weigh 0.36gLiTFSI and dissolve it in 30mL acetonitrile solvent to obtain a 12g / L lithium salt solution;

[0050] (2) Add 1.67g of quasi-one-dimensional lithium lanthanum titanyl Li in every liter of solvent 0.33 La 0.557 TiO 3 Proportioning, it was added to the lithium salt solution obtained in step (1), stirred for 6h, and ultrasonically 30min until uniform;

[0051] (3) Add polyethylene...

Embodiment 2

[0055] A solid polymer composite electrolyte (PEO-LiTFSI-2%LLTO) of the present invention, mainly composed of polyethylene oxide, lithium bistrifluoromethanesulfonylimide (LiTFSI) and quasi-one-dimensional lithium lanthanum titanyl Li 0.33 La 0.557 TiO 3 composition, wherein the molar ratio of polyethylene oxide to LiTFSI is 18:1, polyethylene oxide and quasi-one-dimensional lithium lanthanum titanyl Li 0.33 La 0.557 TiO 3 The mass ratio is 100:2.

[0056] The preparation method of the solid polymer composite electrolyte of this embodiment comprises the following steps:

[0057] (1) Weigh 0.36gLiTFSI and dissolve it in 40mL of acetonitrile solvent to obtain a 9g / L lithium salt solution;

[0058] (2) Add 0.5 g of quasi-one-dimensional lithium lanthanum titanyl Li per liter of solvent 0.33 La 0.557 TiO 3 Proportioning, it was added to the lithium salt solution obtained in step (1), stirred for 6h, and ultrasonically 30min until uniform;

[0059] (3) Add polyethylene oxi...

Embodiment 3

[0063] A solid polymer composite electrolyte (PEO-LiTFSI-8%LLTO) of the present invention is mainly composed of polyethylene oxide, lithium bistrifluoromethanesulfonylimide (LiTFSI) and quasi-one-dimensional lithium lanthanum titanyl Li 0.33 La 0.557 TiO 3 composition, wherein the molar ratio of polyethylene oxide to LiTFSI is 18:1, polyethylene oxide and quasi-one-dimensional lithium lanthanum titanyl Li 0.33 La 0.557 TiO 3 The mass ratio is 100:8.

[0064] The preparation method of the solid polymer composite electrolyte of this embodiment comprises the following steps:

[0065] (1) Weigh 0.36gLiTFSI and dissolve it in 50ml acetonitrile solvent to obtain 7.2g / L lithium salt solution;

[0066] (2) Add 1.6 g of quasi-one-dimensional lithium lanthanum titanyl Li per liter of solvent 0.33 La 0.557 TiO 3 Proportioning, it was added to the lithium salt solution obtained in step (1), stirred for 6h, and ultrasonically 30min until uniform;

[0067] (3) Add polyethylene oxid...

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Abstract

The invention discloses a solid-state polymer composite electrolyte, which is mainly composed of polyethylene oxide, lithium salt and a quasi-one-dimensional inorganic fast ionic conductor. The molarratio of the polyethylene oxide to lithium salt is (15-20): 1, and the mass ratio of the polyethylene oxide to quasi-one-dimensional inorganic fast ionic conductor is 100: (1-20). The preparation method of the invention comprises the following steps: (1) adding a quasi-one-dimensional inorganic fast ionic conductor into a lithium salt solution, stirring, and uniformly dispersing; (2) adding the polyethylene oxide powder into the solution after the step (1), stirring, and uniformly dispersing; and (3) coating the mixed solution after the step (2) on a film-forming substrate and drying to obtainthe composite electrolyte. A solid-state secondary lithium battery using the solid-state polymer composite electrolyte of the present invention has good cycle and rate performance, and has good coulombic efficiency and capacity retention.

Description

technical field [0001] The invention belongs to the field of battery materials, in particular to a solid polymer composite electrolyte and its preparation method and application. Background technique [0002] Due to the increasingly serious problems of environmental pollution and energy shortage, in order to reduce environmental pollution and dependence on fossil fuels, countries around the world have begun to put forward higher requirements for safer and more environmentally friendly new energy fields. With the development of new energy vehicles and the popularization of portable electronic devices, as a power battery, the battery is required to have smaller size, lighter weight and higher safety. Lithium-ion batteries are considered to be the best choice for power batteries because of their light weight and high operating voltage, which are superior to other secondary batteries. [0003] At present, most of the electrolytes used in commercial lithium-ion batteries are org...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0567Y02E60/10
Inventor 朱琳柱鹏辉沈湘黔景茂祥杨乐之
Owner CHANGSHA RES INST OF MINING & METALLURGY
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