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A method for in-situ interface layer modification of solid electrolyte

A technology of solid-state electrolyte and modification method, which is applied in the field of all-solid-state batteries, can solve problems such as poor interface impedance and interface contact, and achieve the effects of low interface impedance, excellent lithium affinity, and simple and easy-to-operate means

Active Publication Date: 2022-05-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problem of extremely large interface impedance and poor interface contact between solid electrolyte and lithium metal anode, the present invention provides an in-situ interface layer modification method for solid electrolyte

Method used

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  • A method for in-situ interface layer modification of solid electrolyte
  • A method for in-situ interface layer modification of solid electrolyte
  • A method for in-situ interface layer modification of solid electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The punched lithium sheets were placed in the Li modified with 0.2 mg titanium carbide. 6.5 La 3 Zr 1.8 Ta 0.2 O 12 On both sides of the solid electrolyte sheet, an all-solid lithium symmetric battery is assembled.

Embodiment 2

[0033] The punched lithium sheets were placed in the Li modified with 0.5 mg titanium carbide. 6.5 La 3 Zr 1.8 Ta 0.2 O 12 On both sides of the solid electrolyte sheet, an all-solid lithium symmetric battery is assembled.

Embodiment 3

[0035] The punched lithium sheets were placed in the Li modified with 0.8 mg titanium carbide. 6.5 La 3 Zr 1.8 Ta 0.2 O 12 On both sides of the solid electrolyte sheet, an all-solid lithium symmetric battery is assembled.

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Abstract

The invention discloses a method for modifying an in-situ interface layer of a solid electrolyte. The method comprises the following steps: step 1, preparing a garnet-type solid electrolyte sheet by a tablet method, and placing it in the air; step 2, carbonizing the Titanium is modified on the surface of the garnet-type solid electrolyte sheet, which is then sintered at high temperature to obtain a titanium carbide-modified garnet-type solid-state electrolyte sheet. The present invention uses a small amount of titanium carbide to in situ in situ the original extremely poor Lithophilic Li 2 CO 3 and other substances into Li with good lithium affinity (8‑3.5x) Ti x o 4 Substances, this in-situ generated reaction can be generated in the reaction system in real time, without separation, and act on the substrate in real time, ensuring the adequacy and completeness of the reaction; the interface obtained after this in-situ conversion has extremely excellent Lithophilicity, and exhibits low interfacial impedance, ensuring long-term cycling of the battery.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state batteries, and relates to a method for increasing the lithium compatibility of solid-state electrolyte sheets by using titanium carbide as an interface modification aid. Background technique [0002] In view of the safety, energy density, and preparation costs of current liquid electrolyte systems, it is urgent to develop solid-state batteries with better performance and higher safety. The higher safety performance of solid-state batteries comes from their high shear modulus, which can inhibit the growth of lithium dendrites. The material has more excellent performance. Experiments show that it has good compatibility with lithium metal and has close to 1mS cm at room temperature. -1 The high ionic conductivity has become the focus of current research. However, Li, which has poor contact with lithium metal, is easily formed on the surface of the garnet-type solid electrolyte sheet. 2 CO ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/052H01M10/058
CPCH01M10/0562H01M10/052H01M10/058H01M2300/0071Y02P70/50Y02E60/10
Inventor 张乃庆彭洪刚范立双张宇
Owner HARBIN INST OF TECH
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