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Active substance, nonaqueous electrolyte battery, and battery pack

A non-aqueous electrolyte and active material technology, applied in the direction of active material electrodes, battery electrodes, batteries, etc., can solve the problems of improved energy density of electrodes, low capacity of titanium oxide, etc., and achieve excellent cycle characteristics

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 substantially difficult to lower the potential of the electrode to improve the energy density
[0007] In addition, titanium oxide has a lower capacity per unit weight

Method used

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  • Active substance, nonaqueous electrolyte battery, and battery pack
  • Active substance, nonaqueous electrolyte battery, and battery pack
  • Active substance, nonaqueous electrolyte battery, and battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0216] In Example 1, an active material was produced by the following procedure.

[0217]

[0218] First, weigh titanium dioxide (TiO 2 ) and niobium pentoxide (Nb 2 o 5 ), to have a molar ratio of 1:1. These materials were placed in a mortar, and ethanol was added thereto and mixed. Then, the mixture was placed in an alumina crucible, followed by heat treatment at 1000° C. for 12 hours in the atmosphere using an electric furnace. After natural cooling, grind and mix the resulting mixture again in a mortar. Then, the mixture was subjected to heat treatment at 1100° C. for 12 hours to obtain active material particles.

[0219] As a result of ICP analysis, it was found that the composition of the active material particles was TiNb 2 o 7 .

[0220]

[0221] The active material particles obtained in the above manner were added to a solution containing 10% by weight of sucrose based on the weight of the active material, followed by mixing with a ball mill. After mixing...

Embodiment 2

[0239] The active material of Example 2 was produced in the same manner as in Example 1 except that the sintering temperature of the composite in a reducing atmosphere was set to 700°C.

[0240] As a result of ICP analysis, it was found that the composition of the active material particles prepared by the solid phase method was TiNb 2 o 7 .

[0241] In addition, the obtained active material was subjected to Raman spectroscopy in the same manner as in Example 1. Figure 12 The resulting Raman spectrum is shown in .

[0242] Such as Figure 12 Shown, the Raman spectrogram of the active material that obtains in embodiment 2 has in 1587cm -1 G band with peak at and at 1350cm -1 D band with a peak at . In addition, the Lorentzian function fitting method was performed, and the peak intensity I of the G band originating from the carbon material G with the peak intensity of the D band I D The ratio between I G / I D is 1.12.

[0243] In addition, the obtained active material...

Embodiment 3

[0245] The active material of Example 3 was produced in the same manner as in Example 1 except that the sintering temperature of the composite in a reducing atmosphere was set to 750°C.

[0246] As a result of ICP analysis, it was found that the composition of the active material particles prepared by the solid phase method was TiNb 2 o 7 .

[0247] The resulting active material was subjected to Raman spectroscopy in the same manner as in Example 1. As a result, it was found that the obtained active material contained -1 Nearby G-band and 1330cm -1 carbon material near the D band. In addition, the Lorentzian function fitting method was performed, and the peak intensity I of the G band G with the peak intensity of the D band I D The ratio between I G / I D is 0.95.

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PUM

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Abstract

The invention relates to an active substance, a nonaqueous electrolyte battery and a battery pack. According to one embodiment, there is provided an active substance. The active substance includes particles of niobium titanium composite oxide and a phase including a carbon material. The niobium titanium composite oxide is represented by Ti1-xM1xNb2-yM2yO7. The phase is formed on at least a part of the surface of the particles. The carbon material shows, in a Raman chart obtained by Raman spectrometry, a G band observed at from 1530 to 1630 cm-1 and a D band observed at from 1280 to 1380 cm-1. A ratio IG / ID between a peak intensity IG of the G band and a peak intensity ID of the D band is from 0.8 to 1.2.

Description

technical field [0001] Embodiments described herein generally relate to active materials, methods for manufacturing active materials, nonaqueous electrolyte cells, and batteries. Background technique [0002] Recently, nonaqueous electrolyte batteries such as lithium ion secondary batteries have been developed as batteries with high energy density. The nonaqueous electrolyte battery is expected to be used as a power source for vehicles such as hybrid vehicles or electric cars or as a large-scale power source for electric power storage. In particular, for use in vehicles, non-aqueous electrolyte batteries are required to have other properties such as quick charging and discharging properties and long-term reliability. A nonaqueous electrolyte battery capable of rapid charging and discharging not only significantly shortens charging time, but also makes it possible to improve performance related to the power of a hybrid vehicle and efficiently recover regenerative energy. ...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/38
CPCH01M4/485H01M4/625H01M4/366H01M10/0525H01M2004/027C01G33/00C01G35/006C01G39/006C01G49/0018C01P2002/72C01P2002/74C01P2002/82C01P2006/40C01P2002/76Y02E60/10H01M2220/20
Inventor 伊势一树吉田赖司原田康宏稻垣浩贵高见则雄
Owner KK TOSHIBA
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