Solid-state Lithium Ion Conductor And Electrochemical Device

A technology of electrochemical components and lithium ions, which is applied in the field of solid lithium ion conductors and electrochemical components, and can solve problems such as the improvement of ion conductivity that is not recorded

Active Publication Date: 2014-09-24
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no description that the ionic conductivity is improved

Method used

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  • Solid-state Lithium Ion Conductor And Electrochemical Device
  • Solid-state Lithium Ion Conductor And Electrochemical Device
  • Solid-state Lithium Ion Conductor And Electrochemical Device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0058] (sample making)

[0059] Weigh Li with a molar ratio of 85:15 2 S (manufactured by Japan High Purity Chemical Research Institute, model: LII06PB) and P 2 S 5 (manufactured by Aldrich, model: 232106), and 1 mol of ZnS (manufactured by Japan High Purity Chemical Research Institute, model: ZNI10PB) was weighed with respect to 99 mol of the mixture. Zn is divalent and contains 0.28 mol % of Zn based on all the materials weighed, and the molar ratio of Li to P is 5.7.

[0060] All the weighed materials were put into a planetary ball mill (manufactured by Fritsch), and pulverized and mixed at a rotation speed of 350 rpm for 6 hours.

[0061] After performing XRD measurement on the mixed powder, that is, the solid lithium ion conductor particles, there is no obvious diffraction peak, that is, there is no crystal phase, that is, an amorphous state. The solid lithium ion conductor particles were put into a tablet molding machine and compressed by the tablet molding machine t...

Embodiment 2）

[0065] The mixed powder obtained by pulverizing and mixing in the same manner as in Example 1 was heat-treated at 240° C. for 2 hours. After the XRD measurement of the mixed powder after the heat treatment, a plurality of obvious diffraction peaks appeared, thus confirming the formation of a crystal phase. After measuring the ionic conductivity in the same manner as in Example 1, the measured value obtained was 4.8×10 -4 S / cm. In addition, after measuring the electron conductivity by the direct current method, the measured value obtained was 3.4×10 -8 S / cm, thus electron conductivity is a negligible level.

Embodiment 3）

[0067] Weigh Li in a molar ratio of 85:15 2 S and P 2 S 5 and mix it. Weigh 0.5 moles of La with respect to 99.5 moles of the mixture 2 S 3 (manufactured by Japan High Purity Chemical Research Institute, model: LAI07PB). La is trivalent, contains 0.28 mol % of La of all the materials weighed, and the molar ratio of Li to P is 5.7. The weighed material was pulverized and mixed in the same manner as in Example 1.

[0068] After the XRD measurement of the mixed powder, that is, the solid lithium ion conductor particles, no obvious diffraction peaks appear, and it is a state without a crystal phase, that is, an amorphous state.

[0069] After measuring the ionic conductivity in the same manner as in Example 1, the measured value obtained was 3.5×10 -4 S / cm. In addition, after measuring the electron conductivity by the direct current method, the measured value obtained was 2.6×10 -8 S / cm, thus electron conductivity is a negligible level.

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Abstract

In order to realize a total-solid lithium ion secondary battery having high performance, a solid-state lithium ion conductor having high ionic conductivity and low electronic conductivity is obtained. The solid-state lithium ion conductor is characterized by containing: Li, P, and S; and at least one metal element selected from Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Zn, Cd, and Hg.

Description

technical field [0001] The present invention relates to solid lithium ion conductors and electrochemical elements. Background technique [0002] Lithium-ion secondary batteries are widely used in portable devices and the like because of their large capacity per unit volume or weight, and research and development for larger capacity applications such as electric vehicles is actively advancing. [0003] A lithium ion secondary battery is composed of a positive electrode, a negative electrode, and a liquid electrolyte disposed between the positive electrode and the negative electrode as main components. Conventionally, positive electrodes and negative electrodes have been formed using electrode-forming coating liquids (for example, slurry-like or paste-like coating liquids) containing respective electrode active materials, binders, and conductive additives. [0004] Since the liquid electrolyte uses a flammable organic solvent, structural measures to prevent liquid leakage are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M10/0562H01M10/0525Y02T10/7011Y02E60/122Y02E60/10Y02T10/70
Inventor 繁田德彦清水千映子
Owner TDK CORPARATION
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