Preparation of a self-crosslinking composite solid-state electrolyte and its all-solid-state lithium-ion battery

A solid electrolyte and lithium-ion battery technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, solid electrolytes, etc. It can solve problems affecting the electrochemical performance of the electrolyte, the deviation of the mechanical properties of the electrolyte, and the complexity of the preparation process, and achieve ionic conductivity. Good, small product shrinkage, simple preparation process

Active Publication Date: 2021-03-05
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mechanical properties of the electrolyte are deviated, and tin salts need to be added as catalysts, which affect the electrochemical properties of the electrolyte, and the preparation process is complicated

Method used

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  • Preparation of a self-crosslinking composite solid-state electrolyte and its all-solid-state lithium-ion battery
  • Preparation of a self-crosslinking composite solid-state electrolyte and its all-solid-state lithium-ion battery
  • Preparation of a self-crosslinking composite solid-state electrolyte and its all-solid-state lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Polypropylene oxide (number-average molecular weight=12000) of 3g terminal silane-terminated polyether, 3g Li 7 La 3 ZrO 12 , 4ml acetonitrile and 4ml tetraethylene glycol dimethyl ether are evenly mixed; add 3g lithium hexafluorophosphate (LiPF 6 ) mixed evenly; the uniformly stirred mixed solution was scraped onto a polytetrafluoroethylene mold, heated at 60°C for 8 hours in a blast drying oven, and transferred to a vacuum oven at 80°C for curing for 4 hours to form a film.

Embodiment 2

[0036] Mix 1.5g polypropylene oxide (number average molecular weight=12000) of silane-terminated polyether, 1g acid-treated PEO, 2ml propylene carbonate and 30ml tetrahydrofuran; add 0.8g lithium hexafluorophosphate (LiPF 6 ) mixed evenly; the uniformly stirred mixed solution was scraped onto a polytetrafluoroethylene mold, heated at 60°C for 8 hours in a blast drying oven, and transferred to a vacuum oven at 80°C for curing for 4 hours to form a film.

Embodiment 3

[0038] 2.2g polypropylene oxide (number average molecular weight=12000) of capping polyether, SiO after 2.8g alkaline treatment 2 Mix evenly with 4ml triethylene glycol dimethyl ether; add 1.4g lithium bistrifluoromethanesulfonylimide (LiTFSI) and mix evenly; scrape the evenly stirred mixed solution on the polytetrafluoroethylene mold, and dry it in the blast Heat at 60°C for 8 hours in the oven, transfer to a vacuum drying oven at 80°C for 4 hours to form a film.

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Abstract

The invention relates to the preparation of a self-crosslinking composite solid electrolyte and an all-solid lithium ion battery formed thereof, and relates to the field of lithium ion battery electrolytes. Specifically, the terminal silane-terminated polyether (MS) is used as the prepolymer, and it is stirred and mixed with inorganic nanoparticles or organic polymer materials with acid and alkali, conductive lithium salt and organic solvent; through MS and with acid and alkali Composite solid electrolytes are prepared by self-crosslinking and solidifying of inorganic nanoparticles or organic polymer materials. Self-crosslinking composite curing of MS and inorganic nanoparticles or organic polymer materials with acid and alkalinity can reduce the crystallinity of the composite solid electrolyte and improve the ionic conductivity, ion migration number, mechanical properties, and electrochemical stability window of the composite solid electrolyte. and battery rate charge and discharge performance, to solve the problem of interface contact in solid-state lithium-ion batteries. Ionic conductivity up to 10 ‑4 Scm ‑1 , the electrochemical window is greater than 5V, the product shrinkage rate is small, and the electrochemical stability is strong.

Description

technical field [0001] The invention relates to the field of lithium-ion battery electrolytes, in particular to a self-crosslinking composite solid-state electrolyte and an all-solid-state lithium-ion battery composed of the same. Background technique [0002] The lithium-ion polymer electrolyte can effectively prevent the formation of metal lithium dendrites, making it possible to use lithium metal with high energy and high specific power as the negative electrode, and greatly improve the electrochemical capacity of lithium-ion batteries. The lithium-ion polymer electrolyte can be arbitrarily shaped, and can also be made into a multi-layer ultra-thin structure and miniaturized, which is easier to assemble with the battery. [0003] In 1973, Wright et al. reported that the mixture of polyethylene oxide (PEO) and electrolyte salt had ion conductivity. Lithium-ion polymer batteries are mainly reflected in high energy density and good rate performance, easy processing, and qua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/058H01M10/0525
CPCH01M10/0525H01M10/056H01M10/058H01M2300/0065H01M2300/0091Y02E60/10Y02P70/50
Inventor 尉海军林志远郭现伟申旭阳
Owner BEIJING UNIV OF TECH
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