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Solid electrolyte and all-solid secondary battery

A solid electrolyte and material technology, applied in solid electrolytes, secondary batteries, non-aqueous electrolytes, etc., can solve problems such as decreased ion conductivity

Active Publication Date: 2019-11-22
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, LiZr 2 (PO 4 ) 3 There is a problem that the crystal structure with low ion conductivity changes at a temperature below 60°C, resulting in a decrease in ion conductivity

Method used

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  • Solid electrolyte and all-solid secondary battery
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  • Solid electrolyte and all-solid secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0167] In Example 1-1, measure the LiZr 2 (PO 4 ) 3 Part of the zirconium is replaced by nickel after the Li 1+0.5x Ni 0.5 Zr 1.5 (PO 4 ) 3 characteristic changes. The result is Figure 6A ~ Figure 6D . Figure 6A is a graph showing changes in potential when the Li number of each structural formula changes, Figure 6B is a graph showing the size of the HOMO-LUMO band gap of the solid electrolyte with respect to the Li number of each structural formula, Figure 6C It is a graph showing the change in the valence state of zirconium and nickel constituting the solid electrolyte when the Li number of each structural formula changes, Figure 6D It is a graph showing the change in the valence state of oxygen constituting the solid electrolyte when the Li number of each structural formula changes.

[0168] Such as Figure 6B As shown, even when a part of zirconium is replaced by nickel, the solid electrolyte maintains electronic insulation in a wide range of Li number arou...

Embodiment 1-2

[0170] In Example 1-2, measure the LiZr 2 (PO 4 ) 3 Part of the zirconium is replaced by vanadium after the Li 1+0.5x V 0.5 Zr 1.5 (PO 4 ) 3 characteristic changes. The result is Figure 7A ~ Figure 7D . Figure 7A is a graph showing changes in potential when the Li number of each structural formula changes, Figure 7B is a graph showing the size of the HOMO-LUMO band gap of the solid electrolyte with respect to the Li number of each structural formula, Figure 7C It is a graph showing the change in the valence state of zirconium and vanadium constituting the solid electrolyte when the Li number of each structural formula changes, Figure 7D It is a graph showing the change in the valence state of oxygen constituting the solid electrolyte when the Li number of each structural formula changes.

[0171] Such as Figure 7B As shown, even when a part of zirconium was substituted with vanadium, the solid electrolyte maintained electronic insulation in a wide range of Li...

Embodiment 1-3

[0173] In Examples 1-3, measure the LiZr 2 (PO 4 ) 3 Part of the zirconium is replaced by tantalum after the Li 1+0.5xTa 0.5 Zr 1.5 (PO 4 ) 3 characteristic changes. The result is Figure 8A ~ Figure 8D . Figure 8A is a graph showing changes in potential when the Li number of each structural formula changes, Figure 8B is a graph showing the size of the HOMO-LUMO band gap of the solid electrolyte with respect to the Li number of each structural formula, Figure 8C It is a graph showing the change in the valence state of zirconium and tantalum constituting the solid electrolyte when the Li number of each structural formula changes, Figure 8D It is a graph showing the change in the valence state of oxygen constituting the solid electrolyte when the Li number of each structural formula changes.

[0174] Such as Figure 8B As shown, even when a part of zirconium is replaced with tantalum, the solid electrolyte maintains electronic insulation in the range of Li number...

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Abstract

This solid electrolyte has a movable ion-containing substance in which some of the elements constituting the substance are substituted and which has, between a valance band and a conductance band, either an occupied impurity level that is occupied by an electron or an unoccupied impurity level that is not occupied by an electron, wherein the smaller one of: the energy difference between the LUMO level and the highest energy level among the occupied impurity levels; and the energy difference between the HOMO level and the lowest energy level among the unoccupied impurity levels, is greater than0.3 eV.

Description

technical field [0001] The invention relates to a solid electrolyte and an all-solid secondary battery. [0002] This application claims priority based on Japanese Patent Application No. 2017-068913 for which it applied in Japan on March 30, 2017, and uses the content here. Background technique [0003] As electrolytes for batteries, research is underway to use flame-retardant polymer electrolytes or ionic liquids. However, since all electrolytes contain organic substances, it is difficult to eliminate concerns about liquid leakage and fire in batteries using the electrolyte. [0004] On the other hand, an all-solid secondary battery using ceramics as an electrolyte is essentially nonflammable and highly safe, and worries about liquid leakage and depletion can be eliminated. Therefore, all-solid secondary batteries have attracted attention in recent years. [0005] Various materials have been reported as solid electrolytes for all-solid secondary batteries. For example, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/06C04B35/488H01B1/08H01M10/0562
CPCH01M10/0562H01B1/06H01B1/08C04B35/447C04B2235/3244C04B2235/3262C04B2235/3279C04B2235/3258C04B2235/446C04B35/547C04B2235/3272C04B2235/3241C04B2235/3294C04B2235/3203C04B2235/3239C04B2235/3251C04B2235/3293C04B2235/3227C04B35/462C04B2235/3201C04B2235/3206C04B2235/764C04B2235/3287C04B35/486H01M2300/0068Y02E60/10C04B35/488
Inventor 佐佐木孝上野哲也矶道岳步
Owner TDK CORPARATION
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