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A kind of composite solid electrolyte and its preparation method and application

A technology of solid electrolytes and composites, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of limited performance improvement of solid electrolytes, achieve excellent lithium ion transmission performance, cycle stability, good compatibility, The effect of high conductivity

Active Publication Date: 2022-06-24
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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  • A kind of composite solid electrolyte and its preparation method and application
  • A kind of composite solid electrolyte and its preparation method and application
  • A kind of composite solid electrolyte and its preparation method and application

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Experimental program
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Embodiment 1

[0065] This embodiment provides a composite solid electrolyte, which consists of the following components according to parts by weight: 50 parts of polyethylene oxide (purchased from Shanghai McLean Biochemical Technology Co., Ltd., trade name 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) with a molar ratio of 18:1 3 ) 3 ·9H 2 O and urea were dissolved in water respectively, and the two were mixed after magnetic stirring uniformly. 3 ) 3 ·9H 2 The concentration of O was 0.5 mmol / L, and then MXene (Nb with a mass ratio of 1:1 was added) 2 C and Nb 4 C 3 ), where Al(NO 3 ) 3 ·9H 2 The mass ratio of O to MXene was 0.94:1, ultrasonic...

Embodiment 2

[0070] This embodiment provides a composite solid-state electrolyte, which consists of the following components according to parts by weight: 55 parts of polyethylene oxide (purchased from Shanghai McLean Biochemical Technology Co., Ltd., trade name 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., trade name 25322-68-3) and 15 parts of 2D flaky 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, and the prepared AlCl 3 The concentration of the 2 C. Ti 3 CN, Ta 4 C 3 and V 2 C), wherein, AlCl 3 The m...

Embodiment 3

[0075] This embodiment provides a composite solid electrolyte, which consists of the following components according to parts by weight: 50 parts of polyethylene oxide (purchased from Shanghai McLean Biochemical Technology Co., Ltd., trade name 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 O and urea were dissolved in water respectively, and the two were mixed after magnetic stirring. 2 (SO 4 ) 3 ·18H 2 The concentration of O was 1 mmol / L, and then MXene (f-Ti 3 C 2 , few-layer titanium carbide, purchased from Shandong Xiyan New Material Technology Co., Ltd.), in which Al 2 (SO 4 ) 3 ·18H 2 The mass ratio of O to MXene was 1.39:1, ultraso...

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Abstract

The invention relates to a composite solid electrolyte and its preparation method and application. The composite solid electrolyte includes the following components: polyethylene oxide, lithium salt, plasticizer and 2D sheet-like inorganic matter; the 2D sheet-like inorganic matter is MXene‑AlOOH complex. The composite solid electrolyte of the invention has high electrical conductivity, good interfacial compatibility between electrodes and the electrolyte, and excellent mechanical properties, and the formed lithium ion battery has both excellent lithium ion transmission performance and cycle stability.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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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