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Solid polymer electrolyte, preparation method thereof, composite positive pole and solid-state lithium-ion battery

A solid polymer and electrolyte technology, applied in solid electrolytes, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of low temperature cycle performance of batteries, poor Coulomb efficiency rate performance, low conductivity lithium ion migration number, etc. Low-temperature electrochemical performance, improved ionic conductivity, and the effect of good cycle performance

Active Publication Date: 2017-06-27
BEIJING DANGDAIJINGDIAN TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also many problems in the solid polymer lithium-ion batteries in the prior art, such as low-temperature lithium-ion conductivity and low lithium-ion migration number, which lead to poor low-temperature cycle performance, coulombic efficiency, and rate performance of the battery.

Method used

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  • Solid polymer electrolyte, preparation method thereof, composite positive pole and solid-state lithium-ion battery
  • Solid polymer electrolyte, preparation method thereof, composite positive pole and solid-state lithium-ion battery
  • Solid polymer electrolyte, preparation method thereof, composite positive pole and solid-state lithium-ion battery

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preparation example Construction

[0041] The present invention also provides a method for preparing the solid polymer electrolyte described in the above technical solution, comprising the following steps:

[0042] (1) Boron oxide, polyethylene glycol and polyethylene glycol monomethyl ether are mixed and heated to obtain a prepolymer;

[0043] (2) adding silane dropwise to the prepolymer obtained in the step (1), and polymerizing to obtain a comb polymer;

[0044] (3) adding a crosslinking agent dropwise to the comb polymer obtained in step (2) to obtain a network polymer precursor;

[0045] (4) mixing the network polymer precursor obtained in the step (3) with a lithium salt, and performing a crosslinking reaction to obtain a solid polymer electrolyte;

[0046] The steps (1), (2) and (3) are carried out under anhydrous and oxygen-free conditions.

[0047] The invention mixes boron oxide, polyethylene glycol and polyethylene glycol monomethyl ether, and heats to obtain a prepolymer. In the present invention...

Embodiment 1

[0078] (1) Boron oxide, polyethylene glycol and polyethylene glycol monomethyl ether were stirred and mixed at 50 r / min for 12 hours, and heated to 60° C. to obtain a prepolymer;

[0079] (2) Add 0.01mL / s of silane dropwise to the prepolymer obtained in the step (1), adjust the pH value to 5, 60°C, stir at 50r / min for 20min and polymerize to obtain a comb polymer;

[0080] (3) 0.012mL / s drop crosslinking agent in the comb polymer that described step (2) obtains, obtain network polymer precursor;

[0081] (4) Stir and mix the network polymer precursor obtained in the step (3) with lithium salt and tetrahydrofuran at 200r / min for 5h. The concentration of the polymer is 10%. The cross-linking reaction obtains a solid polymer electrolyte with a thickness of 100 μm and a diameter of 16 mm;

[0082] The steps (1), (2) and (3) are carried out under anhydrous and oxygen-free conditions, and the step (4) is carried out under an air environment.

[0083] The silane is n-propyltrimetho...

Embodiment 2

[0089] The solid polymer electrolyte prepared in Example 1, the active material, the conductive agent and the binder were ball milled and mixed with a solvent at 300r / min for 24 hours to obtain a mixed material; the active material was lithium cobaltate with a mass fraction of 60%, and the solid polymer The mass fraction of the electrolyte is 20%, the mass fraction of the binder polyvinylidene fluoride is 5%, and the mass fraction of the conductive agent acetylene black is 15%.

[0090] The mixed material was coated and dried at 100° C. for 36 hours, and sliced ​​to obtain a composite positive electrode with a thickness of 80 μm and a diameter of 19 mm.

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Abstract

The invention provides a solid polymer electrolyte, a preparation method thereof, a composite positive pole and a solid-state lithium-ion battery. The solid polymer electrolyte contains a network polymer formed through comb-shaped polymer crosslinking and lithium salt, a comb-shaped polymer includes a main chain and side chains, the main chain is polyethylene glycol bridged between silicon atoms and boron atoms, and the side chains are polyethylene glycol monomethyl ether connected to the silicon atoms or the boron atoms. A structure unit of the comb-shaped polymer has a structure shown as a formula I, wherein R is one of n-propyl triethoxy, vinyl triethoxy, allyl triethoxy, methyl triethoxy, chlorine triethoxy chloride, ethyl triethoxy and propyl triethoxy, m and n are independently 3-22, and x and y are independently 2-44. The solid polymer electrolyte is high in ionic conductivity, and the prepared lithium-ion battery is good in rate capability and high in low-temperature cycle performance and coulombic efficiency.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a solid polymer electrolyte and a preparation method thereof, a composite positive electrode and a solid lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high energy, high working voltage, long life and no environmental pollution. Since their introduction in 1990, they have quickly shown broad application prospects in many fields such as portable electronic devices and electric vehicles. With the continuous development of electronic technology, miniaturized, lightweight and high-performance portable electronic and electrical products have put forward higher requirements for battery performance. As an important part of the battery, the electrolyte plays the role of transporting ions and conducting current between the positive and negative electrodes. Selecting a suitable electrolyte is the key to obtaining a lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565H01M2300/0065H01M2300/0082Y02E60/10
Inventor 施德安纪肖肖张新立吴京
Owner BEIJING DANGDAIJINGDIAN TECH CO LTD
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