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Lithium ion conductive composite material for all solid-state lithium battery, and solid polymer electrolyte and all solid-state lithium battery including the same

A lithium ion and lithium battery technology, applied in the field of lithium ion conductive composition, can solve the problems of adverse effects on the safety of lithium ion batteries, low lithium ion conductivity, reduced battery performance, etc., and achieve high room temperature and high temperature lithium ion conductivity. , the effect of high coulombic efficiency, high room temperature and high temperature discharge gram capacitance

Active Publication Date: 2021-03-12
MING CHI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, volatile and flammable liquid electrolytes have adverse effects on the safety of lithium-ion batteries, and are prone to generate needle-like lithium dendrites after many charge-discharge cycles.
[0003] Although the existing all solid-state lithium battery (ASSLB) using a solid-state electrolyte membrane can effectively avoid the safety problems of electrolyte leakage and needle-like lithium dendrite growth, the solid-state electrolyte membrane and electrodes are prone to failure due to poor contact. sufficient to cause the interface impedance to be too high, and its lithium ion conductivity at room temperature is generally low (about 10 - 7 S / cm), thereby reducing battery performance

Method used

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  • Lithium ion conductive composite material for all solid-state lithium battery, and solid polymer electrolyte and all solid-state lithium battery including the same
  • Lithium ion conductive composite material for all solid-state lithium battery, and solid polymer electrolyte and all solid-state lithium battery including the same
  • Lithium ion conductive composite material for all solid-state lithium battery, and solid polymer electrolyte and all solid-state lithium battery including the same

Examples

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Embodiment 1

[0033] The lithium ion conductive composition and solid polymer electrolyte of Example 1 of the present invention are prepared by a method comprising the following steps:

[0034] PVA (M w =8.9×10 5 , purchased from Sigma-Aldrich) and PAN (M w =1.5×10 5 , purchased from Sigma-Aldrich) mixed in a weight ratio of 92.5:7.5 to obtain a polymer blend (PVA / PAN), followed by lithium bis(trifluoromethanesulfonyl)imide (LiTFSI, purchased from Sigma- Aldrich) was mixed with PVA / PAN and dissolved in dimethyl sulfoxide (DMSO, purchased from Sigma-Aldrich). Then, lithium aluminum titanium phosphate (LATP) and succinonitrile (SN, purchased from Sigma-Aldrich) were added to the above DMSO solution under stirring, wherein the weight ratio of PVA / PAN, LiTFSI, LATP, and SN was 4: 4:2:0.4, heated to 80° C. and kept under stirring for 24 hours to obtain a solution (ie, the lithium ion conductive composition of Example 1).

[0035] Subsequently, the uniformly stirred solution was coated on a ...

Embodiment 2

[0038] The lithium ion conductive composition and solid polymer electrolyte of Example 2 of the present invention are prepared by a method comprising the following steps:

[0039] (1) LiNO 3 (purchased from Alfa Aesar), Al(NO 3 ) 3 9H 2 O (purchased from Alfa Aesar) and La (NO 3 ) 3 ·6H 2 O (purchased from Alfa Aesar) was mixed and stirred at a molar ratio of 6.25:0.25:3 for 30 min to be dissolved in deionized water. (2) In addition, zirconium tetrapropoxide solution (70wt% propanol solution, purchased from Sigma-Aldrich) was dissolved in isopropanol containing 15vol% acetic acid, wherein the ratio of Zr was based on the above (1) Depending on the amount of La used, the molar ratio of La and Zr is 3:2, and an excess of LiNO is added 3 to a concentration of 15wt% to compensate for subsequent loss of lithium during high-temperature calcination.

[0040] The above two solutions (1) and (2) were mixed and stirred for 30 min to form an Al-doped LLZO solution, and then the g...

Embodiment 3

[0044] The lithium ion conductive composition and solid polymer electrolyte of Example 3 of the present invention are prepared by a method comprising the following steps:

[0045] PVA, Al-LLZO and LiTFSI prepared in Example 2 above were mixed and dissolved in DMSO to obtain the first mixture (PVA / Al-LLZO / LiTFSI). Separately, PAN and SN were mixed and dissolved in DMSO to obtain a second mixture (PAN / SN).

[0046] Mix the above first mixture and the second mixture, the weight ratio of PVA and PAN is 92.5:7.5, the weight ratio of the sum of PVA and PAN, LiTFSI, Al-LLZO, SN is 4:4:2:0.4, heat to 80 ℃ and maintained under stirring for 24 hours, and ball milled at a speed of 400 rpm for 2 hours to obtain a uniform solution (ie, the lithium ion conductive composition of Example 3). Then the solution was coated on glass, dried at room temperature (25° C.) for 24 hours, and vacuum-dried at 70° C. for 72 hours to obtain the solid polymer electrolyte membrane SPE3 of Example 3. Finall...

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Abstract

A lithium ion conductive composite material for an all solid-state lithium battery includes a polymer blend, a lithium salt, a lithium ion conductive ceramic filler, and a plasticizer. The polymer blend includes polyacrylonitrile and a polyvinyl polymer selected from the group consisting of polyvinyl alcohol, poly(vinylidene fluoride-hexafluoropropylene), and a combination thereof. The invention also provides a solid-state polymer electrolyte comprising the lithium ion conducting composition and an all-solid-state lithium battery comprising the solid-state polymer electrolyte. The solid polymer electrolyte disclosed by the invention has better thermal stability, high room-temperature and high-temperature lithium ion conductivity and a wide electrochemical window. The all-solid-state lithium battery disclosed by the invention has high room-temperature and high-temperature discharge gram capacitance, high coulombic efficiency and relatively good charge-discharge cycle stability.

Description

technical field [0001] The invention relates to a lithium ion conduction composition, in particular to a lithium ion conduction composition for an all-solid lithium battery, a solid polymer electrolyte and an all-solid lithium battery. Background technique [0002] Lithium-ion battery (LIB) has high open circuit voltage (open circuit voltage), high energy density (energy density), fast charge / discharge rate (C-rate), and long charge / discharge cycle life (cycle life). , low self-discharge and light weight, so it is often used as power storage and power supply equipment for consumer electronics products and transportation facilities. However, volatile and flammable liquid electrolytes have adverse effects on the safety of Li-ion batteries, and are prone to generate needle-like lithium dendrites after many charge-discharge cycles. [0003] Although the existing all solid-state lithium battery (ASSLB) using a solid-state electrolyte membrane can effectively avoid the safety pro...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525H01M10/42
CPCH01M10/0565H01M10/0525H01M10/4235H01M2300/0088H01M10/056H01M2300/0071H01M2300/0082H01M2300/0091
Inventor 杨纯诚吴宜萱陈怀康李明仁
Owner MING CHI UNIVERSITY OF TECHNOLOGY
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