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

An all-solid-state 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 charging and discharging performance, and improving interface compatibility.

Active Publication Date: 2020-04-17
柔电(武汉)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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 all-solid polymer electrolyte and secondary lithium battery containing the electrolyte
  • Preparation method of all-solid polymer electrolyte and secondary lithium battery containing the electrolyte
  • Preparation method of all-solid polymer electrolyte and secondary lithium battery containing the electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In a glove box filled with argon, dissolve LiTFSI in the double-ended dimethylacryloyloxypolymethylphosphonic acid (propylene glycol) ester monomer, add ammonium persulfate and magnetically stir for 4 hours to mix well; inject the well-mixed solution into Li / / SL (SL is a stainless steel pole piece), SL / / SL batteries were polymerized at 60°C for 4 hours, and then the ionic conductivity and electrochemical stability window of the all-solid polymer electrolyte were tested respectively.

[0038] Wherein, the mass ratio of double-ended dimethacryloyloxy polymethylphosphonic acid (propylene glycol) ester monomer, ammonium persulfate and LiTFSI is 100:0.4:35. The ratio of raw materials used to prepare solid polymer electrolytes is shown in Table 1, and the ion conductivity of the prepared polymer for lithium-ion batteries at room temperature is 1.2×10 -4 S / cm, the electrochemical window is 4.5V.

[0039] Table 1

[0040]

Embodiment 2

[0042] In an argon-filled glove box, LiTFSI was dissolved in double-ended dimethylacryloyloxypolymethylphosphonic acid (diethylene glycol) ester monomer, ammonium persulfate and lithium lanthanum zirconium oxide nanoparticles were added After magnetic stirring for 4 hours, mix well; inject the well-mixed solution into Li / / SL (SL is a stainless steel pole piece), put the SL / / SL battery at 60°C for 5 hours, and then test the ions of the all-solid polymer electrolyte Conductivity and electrochemical stability window.

[0043] Wherein, the mass ratio of double-ended dimethylacryloyloxypolymethylphosphonic acid (diethylene glycol) ester, ammonium persulfate, LiTFSI and lithium lanthanum zirconium oxide is 100:0.3:35:7. The ratio of the raw materials used to prepare the solid polymer electrolyte is shown in Table 2, 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 4.5V.

[0044] Table 2 ...

Embodiment 3

[0047] In an argon-filled glove box, LiBOB was dissolved in a mixture of double-ended dimethylacryloyloxypolymethylphosphonic acid (propylene glycol) and single-ended dimethylacryloyloxypolymethylphosphonic acid (propylene glycol) In the body, add potassium persulfate and aluminum 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), and place the SL / / SL battery at 65°C After polymerization for 4 hours, the ionic conductivity and electrochemical stability window of the all-solid polymer electrolyte were tested respectively.

[0048] Among them, the mass ratio of double-ended epoxy-based polymethylphosphonic acid (propylene glycol) ester to single-ended epoxy-based polymethylphosphonic acid (propylene glycol) ester, potassium persulfate, LiBOB and aluminum oxide is 50:50: 0.2:32:7. The ratio of raw materials used to prepare solid polymer electrolytes is shown in Table 3, and ...

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Abstract

The invention discloses a preparation method of an all-solid polymer electrolyte and a secondary lithium battery containing the electrolyte. The end-group unsaturated bond methyl phosphonate oligomer, a free radical initiator, a lithium salt, and a battery additive are prepared according to The mass ratio is 80‑100: 0.1‑0.5: 10‑40: 0‑14. After mixing evenly, it is polymerized and solidified in situ under heating conditions to form a completely non-combustible all-solid electrolyte. The present invention utilizes the mixed solution of low-molecular-weight liquid end group unsaturated bond methyl phosphonate oligomer, free radical initiator, lithium salt and battery additive as solid electrolyte precursor, and in-situ polymerizes and solidifies in the battery to form a completely non-combustible All-solid-state electrolyte, polymer all-solid-state electrolyte has excellent flame retardancy and safety performance due to the use of methyl phosphonate as a building block, which greatly improves the safety performance of energy storage batteries, especially large-capacity batteries and battery packs.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of an all-solid polymer electrolyte and a secondary lithium battery containing the 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 carbonate (ether). , the ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 刘志宏高淑豫刘继延刘学清尤庆亮曹元成周敏邹立勇
Owner 柔电(武汉)科技有限公司
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