Preparation method of all-solid polymer electrolyte through in-situ ring opening polymerization of epoxy compound, and application of the all-solid polymer electrolyte in all-solid lithium battery

An all-solid-state polymer and epoxy-based compound technology, which is applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, electrolyte immobilization/gelation, etc., can solve the problems of high solid/solid interface impedance, poor rate and cycle performance And other issues

Active Publication Date: 2016-08-31
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of these solid polymer electrolytes are prepared by pre-preparing polymer films and then assembled into batteries by winding or stacking the positive and negative electrodes of the battery, which leads to a g

Method used

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  • Preparation method of all-solid polymer electrolyte through in-situ ring opening polymerization of epoxy compound, and application of the all-solid polymer electrolyte in all-solid lithium battery
  • Preparation method of all-solid polymer electrolyte through in-situ ring opening polymerization of epoxy compound, and application of the all-solid polymer electrolyte in all-solid lithium battery
  • Preparation method of all-solid polymer electrolyte through in-situ ring opening polymerization of epoxy compound, and application of the all-solid polymer electrolyte in all-solid lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In a glove box filled with argon, LiTFSI, LiPF 6 Dissolve in polyethylene glycol diglycidyl ether monomer, and stir for 4 hours to mix evenly; inject the evenly mixed solution into Li / / SL (SL is a stainless steel pole piece), and place the SL / / SL battery at 80 o C for 4 hours, and then test the ionic conductivity and electrochemical stability window of the all-solid polymer electrolyte. Among them, polyethylene glycol diglycidyl ether and LiPF 6 , The mass ratio of LiTFSI is 100: 1.3: 40. The ratio of raw materials used to prepare solid polymer electrolytes is shown in the table, and the ion conductivity of the prepared polymer for lithium-ion batteries at room temperature is 1.7 × 10 -4 S / cm, the electrochemical window is 4.0V.

[0022] Table 1:

[0023]

Embodiment 2

[0025] In a glove box filled with argon, LiTFSI, LiPF 6 Dissolve in polyethylene glycol diglycidyl ether monomer, add lithium lanthanum zirconium oxide nanoparticles, and then magnetically stir for 4 hours to mix evenly; inject the evenly mixed solution into Li / / SL (SL is a stainless steel pole piece), SL / / SL 30 in the battery o C for 4 hours, and then test the ionic conductivity and electrochemical stability window of the all-solid polymer electrolyte. Among them, polyethylene glycol diglycidyl ether and LiPF 6 The mass ratio of LiTFSI to lithium lanthanum zirconium oxide is 100:6:35:7. The ratio of raw materials used to prepare solid polymer electrolytes is shown in the table, and the ion conductivity of the prepared polymer for lithium-ion batteries at room temperature is 2.0 × 10 -4 S / cm, the electrochemical window is 4.8V.

[0026] Table 2:

[0027]

Embodiment 3

[0029] In a glove box filled with argon, LiTFSI, LiPF 6 Dissolve epoxy monomethoxypolyethylene glycol ether in polyethylene glycol diglycidyl ether monomer, add Al2O3 nanoparticles and then magnetically stir for 4 hours to mix evenly; inject the evenly mixed solution into Li / / SL (SL is a stainless steel pole piece), put 80 in SL / / SL battery o C for 4 hours, and then test the ionic conductivity and electrochemical stability window of the all-solid polymer electrolyte. Among them, polyethylene glycol diglycidyl ether and epoxy monomethoxypolyethylene glycol ether, LiPF 6 The mass ratio of , LiTFSI and aluminum oxide is 80 : 20 : 6 : 35 : 7. The ratio of raw materials used to prepare solid polymer electrolytes is shown in the table, and the ion conductivity of the prepared polymer for lithium-ion batteries at room temperature is 1.4 × 10 -4 S / cm, the electrochemical window is 4.8V.

[0030] table 3:

[0031]

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Abstract

The invention discloses a preparation method of an all-solid polymer electrolyte through in-situ ring opening polymerization of an epoxy compound, and an application of the all-solid polymer electrolyte in an all-solid battery. The preparation method is characterized in that a liquid-state epoxy compound, a lithium salt, a battery additive and the like are employed as precursors and are injected into between a positive pole sheet and a negative pole sheet of the battery, and under a heating condition, in-situ polymerization solidification is carried out to form the all-solid polymer electrolyte, and furthermore, the all-solid battery is produced. The ionic conductivity at room temperature of the all-solid polymer electrolyte can reach from 1*10<-5> S/cm to 9*10<-3> S/cm and electric potential window is 3.5-5 V. The all-solid polymer electrolyte is prepared through the in-situ copolymerization method, so that the all-solid polymer electrolyte has excellent contact with electrodes, thereby greatly improving interface compatibility of the solid-state battery, reducing interface wetting and modification steps of the solid-state battery, reducing production cost of the solid-state battery and improving performances of the solid-state battery. The invention also discloses an all-solid polymer lithium battery assembled from the all-solid polymer electrolyte.

Description

technical field [0001] The invention relates to the field of solid polymer electrolytes and solid polymer lithium batteries, and provides a method for preparing an all-solid polymer electrolyte by in-situ ring-opening polymerization of epoxy compounds; A preparation method for preparing an all-solid-state polymer lithium battery by ring-opening polymerization. Background technique [0002] Due to the safety problems of lithium-ion batteries such as leakage, fire, and explosion caused by traditional liquid electrolytes, the development and application of high-energy lithium-ion batteries have been seriously hindered. All-solid-state lithium batteries have good safety performance, so the research on solid-state lithium batteries has received widespread attention. Solid-state batteries generally include two categories, the first category is inorganic solid-state lithium batteries, and the second category is solid-state polymer lithium batteries. The solid polymer electrolytes...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/052H01M10/0565
CPCH01M10/052H01M10/0565H01M10/058H01M2300/0085Y02E60/10Y02P70/50
Inventor 崔光磊刘志宏崔艳艳柴敬超崔子立王庆富刘海胜姚建华
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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