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

A solid polymer and secondary lithium battery technology, applied in the field of lithium ion batteries, can solve problems such as easy liquid leakage, achieve the effects of solving fire and explosion, reducing interface impedance, and improving room temperature charge and discharge capabilities and rate performance

Active Publication Date: 2018-03-20
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 solid polymer electrolyte
  • Preparation method of non-combustible solid polymer electrolyte and secondary lithium battery containing solid polymer electrolyte
  • Preparation method of non-combustible solid polymer electrolyte and secondary lithium battery containing solid polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In a glove box filled with argon, the LiPF 6 , LiTFSI dissolved in double-ended epoxy polymethyl phosphate (propylene glycol) ester monomer, magnetically stirred for 4h to mix evenly; inject the evenly mixed solution into Li / / SL, SL / / SL (SL is a stainless steel pole piece) Between the positive and negative electrodes of the battery, place it at 80°C for 4 hours to polymerize, and then test the electrochemical stability window and ionic conductivity of the non-combustible solid polymer electrolyte.

[0036] Among them, double-ended epoxy polymethyl phosphate (propylene glycol) ester and LiPF 6 The mass ratio of LiTFSI and LiTFSI is 100:4:40, and the ratio of raw materials is shown in Table 1. The room temperature ionic conductivity of the prepared lithium-ion battery polymer is 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, the LiPF 6 , LiTFSI is dissolved in double-ended epoxy polymethyl phosphate (diethylene glycol) ester monomer, after adding lithium lanthanum zirconium oxide nanoparticles, magnetically stir for 4 hours and mix well; inject the well mixed solution into Li / / SL , SL / / SL (SL is a stainless steel pole piece) between the positive and negative pole pieces of the battery, and then placed at 60 ° C for 8 hours of polymerization, and then tested the ionic conductivity and electrochemical stability window of the non-combustible solid polymer electrolyte. Among them, double-ended epoxy polymethyl phosphate (diethylene glycol) ester and LiPF 6 The mass ratio of LiTFSI, LiTFSI and lithium lanthanum zirconium oxygen is 100:2:35:7, and the ratio of raw materials is shown in Table 2. The ion conductivity of the prepared polymer for lithium ion batteries at room temperature is 2.6×10 -4 S / cm, the electrochemical window is 4.0V.

[0041] Table 2

[00...

Embodiment 3

[0044] In a glove box filled with argon, the LiPF 6 , LiTFSI and double-end epoxy-based polymethyl phosphate (propylene glycol) ester and single-end epoxy-based polymethyl phosphate (propylene glycol) ester mixed monomer, add aluminum oxide nanoparticles and then magnetically stir for 4h to mix evenly; The uniformly mixed solution was injected between the positive and negative electrodes of Li / / SL, SL / / SL (SL is a stainless steel electrode), and then placed at 80°C for 4 hours of polymerization, and then respectively tested the non-combustible solid polymer electrolyte Ionic conductivity and electrochemical stability window.

[0045] Among them, double-ended epoxy polymethyl phosphate (propylene glycol) ester and single-ended epoxy polymethyl phosphate (propylene glycol) ester, LiPF 6 The mass ratio of LiTFSI, LiTFSI and Al2O3 is 80:20:5:32:7, and the ratio of raw materials is shown in Table 3. The ion conductivity of the prepared polymer for lithium-ion batteries at room tem...

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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. The preparation method comprises the following steps of uniformly mixing an epoxy-terminated methyl phosphonate oligomer, a lithium salt and a battery additive which are in the mass ratio of (60 to 100): (10 to 44): (0 to 14), then, injecting the mixture between positive and negative pole pieces of the battery, and carrying out in-situ polymerization curing under the condition of heating so as to prepare the non-combustible solidpolymer electrolyte. According to the preparation method, in-situ polymerization curing is carried out in the battery by using a mixed solution of the low-molecular-weight liquid epoxy-terminated methyl phosphonate oligomer, the lithium salt and the battery additive as a solid electrolyte precursor, so as to prepare the non-combustible solid polymer electrolyte; by adopting methyl phosphonate as aconstruction unit, the polymer full-solid electrolyte has excellent flame retardance and safety performance, and the safety performance of energy storage batteries, particularly high-capacity batteries and battery packs is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a non-combustible 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 potential 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 used. Currently, the electrolyte used in lithium batteries is a mixed solvent system of flammable carb...

Claims

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Application Information

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Patent Type & Authority Applications(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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