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Composite solid electrolyte as well as preparation method and application thereof

A solid electrolyte and composite technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problem of limited improvement of solid electrolyte performance, achieve excellent lithium ion transport performance and cycle stability, excellent mechanical properties, phase Good capacitive effect

Active Publication Date: 2021-10-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, 0D or 1D nanoparticles have limited improvement in the performance of solid electrolytes. Therefore, it is very important to develop a solid electrolyte based on 2D composite fillers.

Method used

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  • Composite solid electrolyte as well as preparation method and application thereof
  • Composite solid electrolyte as well as preparation method and application thereof
  • Composite solid electrolyte as well as preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0065] This embodiment provides a composite solid electrolyte, which is composed of the following components in parts by weight: 50 parts of polyethylene oxide (purchased from Shanghai Macklin Biochemical Technology Co., Ltd., brand 68441-17-8), lithium 10 parts of salt (LiClO with a mass ratio of 1:1:1 4 、LiPF 6 and LiAsF 6 ), 5 parts of plasticizer (succinonitrile) and 10 parts of 2D flake inorganic matter (the mass ratio of MXene to AlOOH is 1:0.15).

[0066] The preparation method of the above-mentioned composite solid electrolyte comprises the following steps:

[0067] (1) Synthesis of MXene-AlOOH: Al(NO 3 ) 3 9H 2 Dissolve O and urea in water respectively, mix them evenly after magnetic stirring, and the prepared Al(NO 3 ) 3 9H 2 The concentration of O was 0.5mmol / L, and then MXene was added (Nb with a mass ratio of 1:1 2 C and Nb 4 C 3 ), among them, Al(NO 3 ) 3 9H 2 The mass ratio of O to MXene is 0.94:1, sonicate for 10 minutes, pour the uniformly mixed ...

Embodiment 2

[0070] This embodiment provides a composite solid electrolyte, which is composed of the following components in parts by weight: 55 parts of polyethylene oxide (purchased from Shanghai Macklin Biochemical Technology Co., Ltd., brand 68441-17-8), lithium 15 parts of salt (LiBF with a mass ratio of 2:1:1:2:1 4 , LiFSI, LiBC 4 o 8 , LiN(CF 3 SO 2 ) 2 and LiBF 2 C 2 o 4 ), 8 parts of plasticizer (polyethylene glycol, purchased from Shanghai McLean Biochemical Technology Co., Ltd., the brand is 25322-68-3) and 15 parts of 2D sheet-like inorganic substances (the mass ratio of MXene to AlOOH is 1:3 ).

[0071] The preparation method of the above-mentioned composite solid electrolyte comprises the following steps:

[0072] (1) AlCl with a molar ratio of 22:1 3 and urea were dissolved in water respectively, and the two were mixed after magnetic stirring evenly, and the AlCl 3 The concentration is 1.5mmol / L, then add MXene (the mass ratio is 1:1:1:2 Ti 2 C.Ti 3 CN, Ta 4 C ...

Embodiment 3

[0075] This embodiment provides a composite solid electrolyte, which is composed of the following components in parts by weight: 50 parts of polyethylene oxide (purchased from Shanghai Macklin Biochemical Technology Co., Ltd., brand 68441-17-8), lithium 20 parts of salt (LiTFSI), 10 parts of plasticizer (succinonitrile) and 20 parts of 2D flake inorganic matter (the mass ratio of MXene to AlOOH is 1:0.25).

[0076] The preparation method of the above-mentioned composite solid electrolyte comprises the following steps:

[0077] (1) Synthesis of MXene-AlOOH: Al with a molar ratio of 20:1 2 (SO 4 ) 3 18H 2 Dissolve O and urea in water respectively, mix them evenly after magnetic stirring, and prepare Al 2 (SO 4 ) 3 18H 2 The concentration of O was 1mmol / L, and then MXene(f-Ti 3 C 2 , few-layer titanium carbide, purchased from Shandong Xeneyan New Material Technology Co., Ltd.), among them, Al 2 (SO 4 ) 3 18H 2 The mass ratio of O to MXene is 1.39:1, sonicate for 10mi...

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Abstract

The invention relates to a composite solid electrolyte as well as a preparation method and application thereof. The composite solid electrolyte comprises the following components: polyoxyethylene, a lithium salt, a plasticizer and a 2D flaky inorganic substance, wherein the 2D flaky inorganic substance is an MXene-AlOOH compound. The composite solid electrolyte is high in conductivity, good in electrode and electrolyte interface compatibility and excellent in mechanical property, and the formed lithium ion battery has excellent lithium ion transmission performance and cycling stability.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a composite solid electrolyte and its preparation method and application. Background technique [0002] With the continuous consumption of energy and the increasing shortage of resources, energy storage and conversion become more and more important. As the main energy storage and conversion devices at present, secondary batteries have attracted a lot of attention and research. Among them, lithium-ion batteries exhibit the advantages of high working voltage, high energy density, long cycle life, low self-discharge and no memory effect, and have been widely used in mobile phones, computers, drones, aerospace and new energy vehicles, etc. field. The current lithium-ion batteries mostly use liquid electrolytes based on organic solvents and lithium salts, which have safety problems such as liquid leakage, flammability and explosion, while all-solid-state lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0562H01M10/0525Y02E60/10
Inventor 谭强强宋洁尘
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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