Preparation method of solid polymer electrolyte and solid secondary battery thereof

A solid polymer and electrolyte technology, applied in secondary batteries, solid electrolytes, non-aqueous electrolytes, etc., can solve the problems of decreased recycling rate of electrode materials, high interface impedance, and inability to cope with the complex application environment of secondary batteries, and achieve Effect of improving dissociation rate and ion distribution uniformity, good stability and compatibility, and excellent cycle stability

Active Publication Date: 2022-05-20
广东聚圣科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional organic liquid electrolytes are volatile, flammable, and explosive, which is the root cause of poor safety performance of secondary batteries
The intrinsic brittleness of the inorganic solid electrolyte is large, and the heterogeneous interface between the electrode material and the electrode material is difficult to control, which is characterized by high interface impedance and cannot cope with the complex application environment of the secondary battery.
The all-solid polymer electrolyte is light in weight, easy to form a film, and has good viscoelasticity. It also has great advantages in improving battery energy density, widening the operating temperature range, prolonging service life, improving safety performance, and flexibility in multifunctional structure and shape design. great advantages, but its room temperature ionic conductivity is still low (-4S / cm), and the stability of the electrolyte / electrode heterogeneous interface is poor, resulting in electrode Declining material recycling rates

Method used

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  • Preparation method of solid polymer electrolyte and solid secondary battery thereof
  • Preparation method of solid polymer electrolyte and solid secondary battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for preparing a polymer solid electrolyte, using the following steps:

[0018] (I) In a glove box protected by argon and with water content and oxygen content less than 1ppm, mix 0.4g vinylene carbonate and 0.1g ethylenic boron-containing monomer compound After mixing with 0.1g lithium bistrifluoromethanesulfonylimide, add 0.0025mg of azobisisobutyronitrile as an initiator to prepare a precursor solution;

[0019] (II) In a glove box protected by argon and with water content and oxygen content less than 1ppm, inject the precursor solution prepared in step I into the porous cellulose membrane, and select two stainless steel sheets as blocking electrodes to assemble into a button-type battery, and then placed the battery at 60° C. for 24 hours for in-situ polymerization. The electrochemical workstation was used to carry out impedance spectroscopy test on the stainless steel sheet symmetrical battery assembled above, and the measured lithium ion conductivity was...

Embodiment 2

[0021] Select a metal lithium sheet as the electrode, and inject the precursor solution prepared in the first step of Example 1 into a porous cellulose membrane in a glove box protected by argon and with a water content and an oxygen content of less than 1 ppm to form a lithium metal symmetry battery, and heated at 60°C for 24h to in-situ polymerize the precursor to form a solid electrolyte. The steady-state current polarization test and the impedance spectrum test before and after polarization were carried out on the above-mentioned lithium metal symmetric battery by using an electrochemical workstation, and the measured lithium ion migration number was 0.68. As a comparison, a lithium metal symmetric battery assembled with an in-situ polymer solid-state electrolyte containing only vinylene carbonate but no ethylenic boron-containing monomer was tested, and its lithium ion migration number was only 0.43.

Embodiment 3

[0023] The positive electrode of lithium iron phosphate is selected, and the metal lithium sheet is used as the negative electrode, and the precursor solution prepared in the first step of Example 1 is injected into the porous cellulose membrane in a glove box protected by argon and with a water content and an oxygen content of less than 1ppm. Seal it, assemble it into a lithium iron phosphate / lithium metal battery, and heat it at 60°C for 24 hours to polymerize the precursor in situ to obtain a solid lithium iron phosphate / lithium metal battery. As a comparison, a liquid lithium iron phosphate / lithium metal battery was assembled with an organic electrolyte, and the two kinds of lithium iron phosphate / lithium metal batteries assembled above were subjected to a constant current charge and discharge test at a rate of 1C. The test voltage range was 2.5-4V. The initial discharge specific capacity of the solid lithium iron phosphate / lithium metal battery is 141.2mAh / g, which can be ...

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Abstract

The invention discloses a preparation method of a solid polymer electrolyte and its application in a secondary battery, by injecting an ethylenic monomer containing a boron heterocycle and an ethylenic carbonate polymer monomer, a metal salt and After the precursor solution of the initiator is prepared, it is obtained by performing in-situ polymerization reaction by means of heat and microwave. The ester group, ether oxygen and boron-containing functional groups in the solid polymer electrolyte prepared by the present invention can have a strong interaction with the alkali metal salt, which improves the microscopic movement of the chain segment, the dissociation degree of the alkali metal salt and the incompatibility of ions in the electrolyte. Evenly distributed, high ionic conductivity and ion migration number are obtained. At the same time, the in-situ polymerization method improves the compatibility and stability of the electrolyte / electrode heterogeneous interface, and has a good protective effect on negative electrode materials. It can be applied to many Scale flexible energy storage devices and achieve superior cycle stability and high safety.

Description

technical field [0001] The invention relates to a preparation method of a secondary battery electrolyte and a secondary battery, in particular to a preparation method of a solid polymer electrolyte and a solid secondary battery. Background technique [0002] As an important part of the new secondary battery, the electrolyte not only controls the kinetic process of ion transport inside the battery, but also fundamentally determines the working mechanism of the battery, affecting the specific energy, rate charge and discharge performance, cycle life, safety performance and production costs, etc. Traditional organic liquid electrolytes are volatile, flammable, and explosive, which is the root cause of poor safety performance of secondary batteries. Inorganic solid electrolytes are inherently brittle, and the heterogeneous interface with electrode materials is difficult to control, showing high interfacial impedance, which cannot cope with the complex application environment of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565
CPCH01M10/0565H01M2300/0082Y02E60/10
Inventor 韦伟峰马骋陈敏健
Owner 广东聚圣科技有限公司
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