Niobium-containing oxide powder, electrode using same, and power storage device

The niobium-containing oxide powder with controlled composition and particle size, along with surface-treated Mo or Ce, addresses the energy density and rate issues of conventional powders, enhancing battery performance in both liquid and solid-state lithium-ion batteries.

JP7743904B2Active Publication Date: 2025-09-25UBE CORPORATION
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Patent Information

Application Number
JP2024168551
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2024-09-27
Publication Date
2025-09-25
Estimated Expiration
2043-06-29

AI Technical Summary

Technical Problem

Existing niobium-containing oxide powders, such as Ti2Nb14O39, face issues with low energy density, significant specific surface area leading to initial efficiency drops, insufficient capacity due to non-contact with solid electrolyte, and poor charge/discharge rate characteristics when used in all-solid-state batteries, along with electrode thickness changes during cycling.

Method used

A niobium-containing oxide powder with specific elemental substitutions and controlled particle size and surface area, formulated as AaTi2-x(M1,0.5+vM2,0.5-v)xNb14O39±z or AaTi2-y(M1,0.67+wM3,0.33-w)yNb14O39±z, where A is Li or Na, M1 is Nb, Ta, or V, M2 is Al, Ga, Fe, or Cr, M3 is Mg, Ca, Cu, or Zn, and controlled D50, D10, and D90 particle sizes, combined with localized Mo or Ce on the surface to enhance conductivity and stability.

Benefits of technology

The solution provides excellent rate characteristics, maintains initial discharge capacity, and minimizes electrode thickness changes during charge and discharge, improving energy density and cycle life in both liquid and all-solid-state batteries.

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Abstract

To provide niobium-containing oxide powder used as an electrode material of a nonaqueous electrolyte electricity storage device, excellent in rate characteristics while maintaining an initial discharge capacity, small in thickness change rate of an electrode accompanying charge and discharge, and excellent in the initial discharge capacity with a whole solid battery, and rate characteristics, an electrode therewith, and an electricity storage device.SOLUTION: Niobium-containing oxide powder satisfies the following formula (I) or (II): AaTi2-x(M10.5+vM20.5-v)xNb14O39±z (I) AaTi2-y(M10.67+wM30.33-w)yNb14O39±z (II) (wherein A is at least one element selected from Li and Na, M1 is at least one element selected from Nb, Ta, and V, M2 is at least one element selected from Al, Ga, Fe, and Cr, M3 is at least one element selected from the group consisting of Mg, Ca, Cu, and Zn, and 0≤a≤6, -0.05≤v≤0.05, -0.05≤w≤0.05, 0<x<2, 0<y<2, 0≤z≤1).SELECTED DRAWING: None
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Citation Information

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