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Complete solid composite polymer electrolyte containing solid acid and preparing process therefor

A composite polymer and solid acid technology, applied in the direction of organic material conductors, circuits, electrical components, etc., can solve the problems of limitation and unfavorable lithium ion transmission, and achieve the effect of high ion conductivity and good electrochemical stability

Inactive Publication Date: 2006-11-15
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to its inherent structural characteristics, PEO exhibits high crystallinity in the normal temperature range, which is not conducive to the transport of lithium ions in it, because it is generally believed that lithium ion migration in PEO-based polymer electrolytes is usually associated with polymer chains in the amorphous region. segmental movement, so the ionic conductivity of the PEO-based polymer electrolyte is usually less than 10 at room temperature. -5 S cm -1 , which greatly limits its application (F.Croce, G.B.Appetecchi, L.Persi, B.Scrosati, Nature, 1998,394,456) in conventional small portable mobile appliances (such as notebook computers, mobile phones, etc.

Method used

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  • Complete solid composite polymer electrolyte containing solid acid and preparing process therefor
  • Complete solid composite polymer electrolyte containing solid acid and preparing process therefor
  • Complete solid composite polymer electrolyte containing solid acid and preparing process therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1 PEO-LiClO 4 / SO 4 2- -ZrO 2

[0019] Take 0.101g LiClO 4 and 0.01~0.1g SO 4 2- -ZrO 2 Dissolve in 12 mL of acetonitrile, ultrasonically disperse for 15 min and then stir for 2 h, then add 0.5 g of PEO (molecular weight 1×10 6 ), after stirring at room temperature for 24 hours, a uniform and transparent viscous solution was obtained. The solution was poured into a polytetrafluoroethylene mold and then placed in a self-built atmospheric pressure purging device. -1 The flow of dry air was purged for 48 hours, and after the acetonitrile solvent was basically volatilized, it was then vacuum-dried at 50°C for 24 hours to remove a small amount of residual solvent. The resulting PEO 12 -LiClO 4 / X%SO 4 2- -ZrO 2 The thickness of the translucent self-supporting film is about 100-200 μm. The prepared samples were then tested for ionic conductivity ( figure 1 , figure 2 ) and the electrochemical stability window ( image 3 )test.

Embodiment 2

[0020] Example 2 PEO-LiClO 4 / SO 4 2- -TiO 2

[0021] Take 0.101g LiClO 4 and 0.01~0.1g SO 4 2- -TiO 2 Dissolve in 12 mL of acetonitrile, ultrasonically disperse for 15 min and then stir for 2 h, then add 0.5 g of PEO (molecular weight 1×10 6), the preparation process is the same as in Example 1. The resulting PEO 12 -LiClO 4 / X%SO 4 2- -TiO 2 The thickness of the translucent self-supporting film is about 100-200 μm. The prepared samples were then tested for ionic conductivity ( figure 1 , Figure 4 )test.

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Abstract

The solid compound polymer electrolyte consists of polyoxyethylene, lithium salt and solid acid in the amount of 2-20 wt% of polyoxyethylene. The solid compound polymer electrolyte is prepared through dissolving lithium salt and solid acid in acetonitrile; adding polyoxyethylene to form homogeneous solution; pouring the homogeneous solution into PFET mold, evaporating solvent and stoving inside vacuum stove. By means of mixing solid acid into polyoxyethylene / lithium salt, the present invention prepares solid compound polymer electrolyte with high ion conductivity and excellent electrochemical stability. The solid compound polymer electrolyte containing solid acid may be used in secondary lithium ion cell.

Description

technical field [0001] The invention relates to a polymer electrolyte and a preparation method thereof, in particular to an all-solid composite polymer electrolyte containing solid acid for a lithium-ion secondary battery and a preparation method thereof. Background technique [0002] Since British Wright et al. (D.E.Fenton, J.M.Parker, P.V.Wright, Polymer, 1973, 14, 589) discovered in 1973 that the complexes of polyethylene oxide (PEO) and alkali metal salts have ion conductivity, PEO-LiX (X=ClO 4 - , I - , BF 4 - , PF 6 - , CF 3 SO 3 - etc.) system polymer electrolyte (Polymer Electrolyte) has long been widely concerned because it may replace the liquid electrolyte in the traditional lithium-ion battery and become the electrolyte material in the all-solid-state polymer lithium-ion battery (J.M.Tarascon, M.Armand, Nature , 2001, 414, 359). [0003] Due to its inherent structural characteristics, PEO exhibits high crystallinity at room temperature, which is not co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01B1/12
Inventor 席靖宇唐小真
Owner SHANGHAI JIAOTONG UNIV