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LLZTO/SPE composite electrolyte based on lithium lanthanum zirconium oxide and preparation method of LLZTO/SPE composite electrolyte

A composite electrolyte, lithium lanthanum zirconium oxide technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of low ionic conductivity, achieve wide electrochemical window, low interface impedance, and improve rigidity

Pending Publication Date: 2022-08-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ionic conductivity of the currently prepared PEO-based composite solid electrolytes at room temperature is still at a low level, and the practical application performance still needs to be further improved.

Method used

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  • LLZTO/SPE composite electrolyte based on lithium lanthanum zirconium oxide and preparation method of LLZTO/SPE composite electrolyte
  • LLZTO/SPE composite electrolyte based on lithium lanthanum zirconium oxide and preparation method of LLZTO/SPE composite electrolyte
  • LLZTO/SPE composite electrolyte based on lithium lanthanum zirconium oxide and preparation method of LLZTO/SPE composite electrolyte

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preparation example Construction

[0042] A preparation method of LLZTO / SPE composite electrolyte based on lithium lanthanum zirconium oxygen, comprising the following steps:

[0043] S1: Preparation of LLZTO solid electrolyte raw material powder by solid-state reaction method:

[0044] S1-1: Select LiOH·H with a purity greater than 98% 2 O, ZrO, La 2 O 3 , Ta 2 O 5 As the raw material of LLZTO material, according to the chemical formula Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 The initial raw material powder is obtained by mixing uniformly through one ball milling;

[0045] S1-2: calcining the initial raw material powder at 900-950°C (preferably 920-950°C) for 6-8h to obtain pre-synthesized LLZTO powder;

[0046] S1-3: The pre-synthesized LLZTO powder is subjected to secondary ball milling and drying (preferably the drying temperature is 100°C) to obtain the LLZTO solid electrolyte raw material powder; preferably, the 200-mesh sieve material is used as the LLZTO solid electrolyte raw material powder ;

[004...

Embodiment 1

[0060] Example 1: EO:Li=20:1 in SPE, CTS is 10% of PEGDE

[0061] An LLZTO / SPE composite electrolyte based on lithium lanthanum zirconium oxygen, the preparation method comprising the following steps:

[0062] S1: Preparation of LLZTO solid electrolyte raw material powder by solid-state reaction method:

[0063] S1-1: Select LiOH·H with a purity greater than 98% 2 O, ZrO, La 2 O 3 , Ta 2 O 5 As the raw material of LLZTO material, according to the chemical formula Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 The initial raw material powder is obtained by mixing uniformly through one ball milling;

[0064] S1-2: calcining the initial raw material powder at 900 °C for 6 h to obtain pre-synthesized LLZTO powder;

[0065] S1-3: The pre-synthesized LLZTO powder is sequentially subjected to secondary ball milling and drying at 100°C, and then passed through a 200-mesh sieve to obtain the LLZTO solid electrolyte raw material powder;

[0066] In the above-mentioned ball milling process, ...

Embodiment 2

[0078] A kind of LLZTO / SPE composite electrolyte based on lithium lanthanum zirconium oxygen, its preparation method is compared with embodiment 1, the difference only lies in:

[0079] In step S3-1, EO:Li=15:1 (molar ratio), PEGDE:CTS=5:1 (mass ratio);

[0080] The rest are the same as in Example 1.

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Abstract

The invention relates to an LLZTO / SPE composite electrolyte based on lithium lanthanum zirconium oxide and a preparation method of the LLZTO / SPE composite electrolyte, and the preparation method comprises the following steps: mixing a porous thin-layer LLZTO solid electrolyte prepared by adopting a tape casting process with glycidyl ether oxypropyl cyclotetrasiloxane, polyethylene glycol diglycidyl ether, an initiator and a lithium salt, and heating and curing to obtain the LLZTO / SPE composite electrolyte. Compared with the prior art, the composite electrolyte has the advantages that the lithium ion transmission performance of an inorganic electrolyte LLZTO ceramic framework is good, the machinability of the composite electrolyte is good, the voltage window is wide and the like, the contact resistance of organic and inorganic electrolytes can be effectively improved, and the development of an all-solid-state battery is facilitated.

Description

technical field [0001] The invention belongs to the technical field of solid electrolyte materials, and relates to an LLZTO / SPE composite electrolyte based on lithium lanthanum zirconium oxygen and a preparation method thereof. Background technique [0002] A lithium-ion battery is a device that efficiently stores electrical energy in the form of chemical energy. Compared with other secondary battery systems, lithium-ion batteries have the advantages of high energy density, long cycle life, and no memory effect. Lithium-ion batteries were first commercialized by Japan's Sony Corporation in 1991 and gradually entered human life. They are now widely used in various electronic products, electric vehicles and energy storage power stations. However, the promotion of new energy vehicles and the gradual arrival of the 5G era have put forward higher requirements for the safety performance and energy density of lithium-ion batteries. So far, the energy density of traditional liquid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0565H01M10/058H01M10/0525Y02P70/50
Inventor 翟继卫何霞沈波
Owner TONGJI UNIV
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