Preparation method of non-combustible solid polymer electrolyte and secondary lithium battery containing the solid polymer electrolyte

A solid polymer, secondary lithium battery technology, applied in the field of lithium ion batteries, can solve problems such as easy leakage of liquids, and achieve the effects of solving fire and explosion, improving safety performance, and improving flame retardant and safety performance.

Active Publication Date: 2020-04-14
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, the use of liquid phosphate electrolyte still has problems such as easy leakage of liquid, so the present invention provides a solid polyphosphate electrolyte

Method used

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  • Preparation method of non-combustible solid polymer electrolyte and secondary lithium battery containing the solid polymer electrolyte
  • Preparation method of non-combustible solid polymer electrolyte and secondary lithium battery containing the solid polymer electrolyte
  • Preparation method of non-combustible solid polymer electrolyte and secondary lithium battery containing the solid polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In a glove box filled with argon, put LiPF 6 , LiTFSI is dissolved in the double-ended epoxy polymethylphosphonic acid (propylene glycol) ester monomer, and the mixture is evenly mixed by magnetic stirring for 4 hours; the mixed solution is injected into Li / / SL, SL / / SL (SL is stainless steel pole piece) Between the positive and negative plates of the battery, they were polymerized at 80°C for 4 hours, and then the electrochemical stability window and ionic conductivity of the non-flammable solid polymer electrolyte were tested.

[0036] Among them, two-terminal epoxy polymethylphosphonic acid (propylene glycol) ester and LiPF 6 , The mass ratio of LiTFSI is 100:4:40, and the raw material ratio is shown in Table 1. The prepared polymer for lithium ion batteries has a room temperature ion conductivity of 1.3×10 -4 S / cm, the electrochemical window is 4.0V.

[0037] Table 1

[0038]

Embodiment 2

[0040] In a glove box filled with argon, put LiPF 6 , LiTFSI is dissolved in the double-ended epoxy polymethylphosphonic acid (diethylene glycol) ester monomer, and after adding lithium lanthanum zirconium oxide nanoparticles, the mixture is uniformly mixed by magnetic stirring for 4 hours; the mixed solution is injected into Li / / Between the positive and negative plates of the battery of SL and SL / / SL (SL is stainless steel pole piece), polymerize at 60℃ for 8 hours, and then test the ionic conductivity and electrochemical stability window of the non-flammable solid polymer electrolyte. . Among them, two-terminal epoxy polymethylphosphonic acid (diethylene glycol) ester and LiPF 6 The mass ratio of LiTFSI and lithium lanthanum zirconium oxygen is 100:2:35:7, and the raw material ratio is shown in Table 2. The room temperature ion conductivity of the prepared polymer for lithium ion batteries is 2.6×10 -4 S / cm, the electrochemical window is 4.0V.

[0041] Table 2

[0042]

[0043]...

Embodiment 3

[0045] In a glove box filled with argon, put LiPF 6 , LiTFSI and double-ended epoxy polymethylphosphonic acid (propylene glycol) ester and single-ended epoxy polymethylphosphonic acid (propylene glycol) ester mixed monomers, add aluminum oxide nanoparticles and magnetically stir for 4h to mix well ;Pour the mixed solution between the positive and negative plates of Li / / SL, SL / / SL (SL is stainless steel pole piece), and then polymerize at 80℃ for 4 hours, and then test the non-flammable solid polymer. The ionic conductivity of the electrolyte and the electrochemical stability window.

[0046] Among them, double-ended epoxy polymethylphosphonic acid (propylene glycol) ester and single-ended epoxy polymethylphosphonic acid (propylene glycol) ester, LiPF 6 The mass ratio of LiTFSI and aluminum oxide is 80:20:5:32:7, and the raw material ratio is shown in Table 3. The prepared polymer for lithium ion battery has a room temperature ion conductivity of 2.4×10 -4 S / cm, the electrochemical...

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Abstract

The invention discloses a preparation method of a non-combustible solid polymer electrolyte and a secondary lithium battery containing the solid polymer electrolyte. Salt and battery additives are mixed evenly according to the mass ratio of 60-100:10-44:0-14, injected between the positive and negative electrodes of the battery, polymerized and solidified in situ under heating conditions to form a non-combustible solid polymer electrolyte, That's it. The present invention uses the mixed solution of low molecular weight liquid epoxy-terminated methyl phosphonate oligomer, lithium salt and battery additives as the solid electrolyte precursor, and in-situ polymerizes and solidifies in the battery to form a non-combustible solid polymer electrolyte. Due to the use of methyl phosphonate as the building unit, the all-solid-state electrolyte has excellent flame retardancy and safety performance, which greatly improves the safety performance of energy storage batteries, especially large-capacity batteries and battery packs.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a non-flammable solid polymer electrolyte and a secondary lithium battery containing the solid polymer electrolyte. Background technique [0002] Compared with other energy storage methods, lithium-ion batteries have the advantages of high voltage, low self-discharge rate, and high energy density. Therefore, lithium-ion batteries are gradually replacing traditional batteries and expanding their application fields. However, with the continuous improvement of the energy density of lithium-ion batteries and the enlargement of energy storage modules, the safety hazards of lithium-ion batteries have always been the primary problem for researchers to solve. The poor safety of lithium-ion batteries is mainly due to the electrolyte system it uses. The electrolyte used in lithium-ion batteries is currently a flammable carbonate (ether) mixed solvent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 刘学清刘继延刘志宏曹元成尤庆亮周敏邹立勇高淑豫
Owner JIANGHAN UNIVERSITY
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