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Active substance

A technology of active materials and active materials, applied in niobium compounds, climate sustainability, non-aqueous electrolyte batteries, etc., can solve problems such as difficulty in reducing electrode potential energy density, and achieve excellent high current performance, cycle performance, and high capacity Effect

Inactive Publication Date: 2015-03-25
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is inherently difficult to lower the potential of the electrode to improve the energy density

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0023] According to a first embodiment, an active substance is provided. The active material includes secondary particles and a carbon material phase formed on at least a portion of a surface of each of the secondary particles. Each of the secondary particles is composed of agglomerated active material primary particles. The primary particles of active materials include Li x m (1‐y) Nb y Nb 2 o (7+δ) A niobium composite oxide, wherein M is at least one selected from Ti and Zr, and x, y, and δ satisfy 0≤x≤6, 0≤y≤1, and -1≤δ≤1, respectively. The compression burst strength of the secondary particles is 10 MPa or higher.

[0024] Formula Li x m (1‐y) Nb y Nb 2 o (7+δ) The indicated niobium composite oxide can provide a battery capable of stably repeating rapid charge and discharge without impairing rate performance and energy density for the reasons described below.

[0025] The following will refer to figure 1 and 2 An example of a crystal structure of a niobium com...

no. 2 approach

[0100] According to a second embodiment, a method of producing an active substance is provided. Active species include Li x m (1‐y) Nb y Nb 2 o (7+δ) A niobium composite oxide, wherein M is at least one selected from Ti and Zr, and x, y, and δ satisfy 0≤x≤6, 0≤y≤1, and -1≤δ≤1, respectively. The method includes: providing a niobium composite oxide according to a solid phase reaction; grinding the niobium composite oxide to provide a ground product; forming the ground product into secondary particles; sintering the secondary particles; a surface of a sintered secondary particle, formed including the secondary particle and the carbon precursor; and the carbonized carbon precursor.

[0101] Hereinafter, a method of producing an active substance according to the second embodiment is explained.

[0102] First, for example, as described below, a niobium composite oxide is obtained by a solid phase reaction. However, the method of obtaining the niobium composite oxide is not li...

no. 3 approach

[0116] According to a third embodiment, there is provided a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The negative electrode includes the active material according to the first embodiment.

[0117] The nonaqueous electrolyte battery according to the third embodiment may further include a separator provided between the positive electrode and the negative electrode, a container containing the positive electrode, the negative electrode, the separator, and the nonaqueous electrolyte, a positive terminal, and a negative terminal. The positive electrode can be spatially separated from the negative electrode in such a manner that a separator is sandwiched between the electrodes. The negative terminal can be electrically connected to the negative electrode. The positive terminal can be electrically connected to the positive electrode.

[0118] Hereinafter, the container, nega...

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Abstract

According to one embodiment, there is provided an active substance. The active substance includes secondary particles and a carbon material phase formed on at least a part of a surface of each of the secondary particles. Each of the secondary particles is constructed by aggregated primary particles of an active material. The primary particles of the active material includes a niobium composite oxide represented by LixM(1-y)NbyNb2O(7+[delta]), wherein M is at least one selected from the group consisting of Ti and Zr, and x, y, and [delta] respectively satisfy 0!<=x!<=6, 0!<=y!<=1, and -1 PRG [delta]!<=1. The secondary particles have a compression fracture strength of 10 MPa or more.

Description

technical field [0001] Embodiments described in this specification generally relate to active materials, methods of manufacturing active materials, nonaqueous electrolyte batteries, battery packs, and automobiles. Background technique [0002] Recently, nonaqueous electrolyte batteries such as lithium ion secondary batteries have been developed as batteries with high energy density. Nonaqueous electrolyte batteries are expected to be used as power sources for vehicles, such as hybrid or electric vehicles, or as large-scale power sources for electricity storage. Further, non-aqueous electrolyte batteries are also expected to be used as uninterruptible power supplies for mobile phone base stations. Therefore, non-aqueous electrolyte batteries are required to have other properties such as rapid charging and discharging properties and long-term reliability. A non-aqueous electrolyte battery capable of rapid charging and discharging can not only significantly shorten the chargi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485
CPCH01M4/362H01M4/485H01M10/058H01M50/50C01G33/00C01G33/006C01P2002/52C01P2002/72C01P2002/76C01P2002/77C01P2004/03C01P2004/61C01P2006/12C01P2006/21H01M4/366H01M4/625H01M10/052H01M2220/20Y02E60/10C01P2006/40Y02P70/50
Inventor 稻垣浩贵原田康宏吉田赖司伊势一树高见则雄
Owner KK TOSHIBA
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