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Active material for battery, manufacturing method of the same, non-aqueous electrolytic battery and battery pack

a technology of active materials and batteries, which is applied in the direction of batteries, non-aqueous electrolyte cells, alkali titanates, etc., can solve the problems of deterioration of battery performance, low electronic conductivity and lithium ion conductivity of large current characteristics of battery using spinel type lithium titana

Inactive Publication Date: 2009-02-12
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0057]Further, a result of novel method developed based on the new idea of the present inventors, it has been found out that it is possible to easily manufacture an active material which is useful in a battery and formed of a mixed phase comprising the lithium titanium composite oxide phase exhibiting excellent performance as explained above and the nonstoichiometric titanium oxide phase.
[0054]The active material for a battery according to one embodiment as explained above comprises a mixed phase which comprises a lithium titanium composite oxide phase which is excellent in the absorption / desorption performance of lithium acting as a major active substance and also higher in electric potential in the absorption / desorption of lithium, and by a nonstoichiometric titanium oxide phase functioning as a conductive agent. Because of this, when the active material is employed as an active material of the negative electrode for example, it is possible to realize a non-aqueous electrolyte battery which is free from the generation of gas as described hereinafter and excellent in large current characteristics.

Problems solved by technology

The spinel type lithium titanate however is relatively low in electronic conductivity and in lithium ion conductivity, so that the large current characteristics of battery using this spinel type lithium titanate are relatively low as compared with the battery using a carbonaceous material as an active material of the negative electrode.
The aforementioned three patent documents however are accompanied with the following problems.
As a result, when a large quantity of carbonaceous material is added to lithium titanium composite oxides as proposed by JP-A 9-199179 (KOKAI), the carbonaceous material is permitted to excessively react with an electrolyte to generate gas and, when the electrolyte is exhausted, the battery is caused to deform, resulting in the deterioration in performance of battery.
When the pulverized lithium titanium composite oxides are to be employed as suggested in JP-A 2002-100354 (KOKAI), it is required to incorporate a large quantity of carbonaceous material in order to form a conductive path linking these pulverized particles, resulting in the generation of a large quantity of gas.
As a result, the viscosity of slurry becomes higher, making it difficult to coat the slurry on the current collector and, at the same time, the binder itself becomes an obstacle for the diffusion of electrons and ions, thereby deteriorating the large current characteristics.
However, although the non-aqueous electrolyte battery equipped with a negative electrode containing lithium titanium composite oxide and nonstoichiometric titanium oxide is effective in improving high-temperature cycle characteristics, it does not necessarily indicate excellent large current characteristics.
The other reason is that it is difficult to make the nonstoichiometric titanium oxide into fine powder as compared with the carbonaceous material.

Method used

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  • Active material for battery, manufacturing method of the same, non-aqueous electrolytic battery and battery pack
  • Active material for battery, manufacturing method of the same, non-aqueous electrolytic battery and battery pack
  • Active material for battery, manufacturing method of the same, non-aqueous electrolytic battery and battery pack

Examples

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Effect test

example 1

Manufacture of Active Material of Negative Electrode

[0123]A predetermined quantity of lithium hydroxide was dissolved as a Li source in pure water to obtain a solution. To this solution was added titanium oxide at such a mixing ratio that the atomic ratio between lithium and titanium became 4 / 5: (1+α) [α=0.1], i.e., 4 / 5:1.1 and then the resultant mixed solution was stirred and dried to obtain powdery body. This powdery body was then subjected to primary sintering in air atmosphere at a temperature of 850° C. for 12 hours. After this primary sintering, the resultant powder was subjected to secondary sintering in hydrogen gas atmosphere at a temperature of 850° C. for one hour to manufacture a powdery active material of the negative electrode.

[0124]The powdery active material of the negative electrode thus obtained was then subjected to XRD analysis. As a result, it was possible to confirm the existence of not only a spinel type lithium titanium composite oxide phase but also a nonsto...

examples 2-6

[0136]Five kinds of active materials of the negative electrode were manufactured by repeating the same procedures as described in Example 1 excepting that the a of the atomic ratio [4 / 5:(1+α)] between lithium and titanium was variously changed on the occasion of mixing lithium hydroxide with titanium oxide in the manufacture of the powdery active material of the negative electrode which consisted of a mixed phase comprising the spinel type lithium titanium composite oxide and the nonstoichiometric titanium oxide phase. Five kinds of the non-aqueous electrolyte batteries, each constructed as that of Example 1, were assembled by following the same method as described in Example 1 excepting that these active materials of the negative electrode were employed in the manufacture of the negative electrode.

example 7

Manufacture of Active Material of Negative Electrode

[0151]A predetermined amount of lithium hydroxide was dissolved as a Li source in pure water to obtain a solution. To this solution was added titanium oxide at such a mixing ratio that the atomic ratio between lithium and titanium became 2 / 3: (1+α) [α=0.1], i.e., 2 / 3:1.1 and then the resultant mixed solution was stirred and dried to obtain powdery body. This powdery body was then subjected to primary sintering in air atmosphere at a temperature of 1050° C. for 12 hours. After this primary sintering, the resultant powder was subjected to secondary sintering in hydrogen gas atmosphere at a temperature of 1000° C. for one hour to manufacture a powdery active material of the negative electrode.

[0152]The powdery active material of the negative electrode thus obtained was then subjected to XRD analysis. As a result, it was possible to confirm the existence of not only a lithium titanium composite oxide phase of ramsdellite type structure...

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Abstract

An active material for a battery includes a mixed phase includes a lithium titanium composite oxide phase and a nonstoichiometric titanium oxide phase. This active material is excellent in lithium absorption / desorption performance, exhibiting high electric potentials in lithium absorption / desorption and high conductivity.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2007-210281, filed Aug. 10, 2007, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to an active material for battery, a method of manufacturing the active material for battery, a non-aqueous electrolyte battery and a battery pack.[0004]2. Description of the Related Art[0005]Since the non-aqueous electrolyte battery is designed such that the charging / discharging thereof is effected through the movement of lithium ions between a negative electrode and a positive electrode, it is expected to be useful as a battery exhibiting high energy density, so that the research and development of the non-aqueous electrolyte battery are now intensively conducted.[0006]The non-aqueous electrolyte battery is demanded to have various properties dep...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M10/48H01M4/48H01M6/16H01M4/40H01M4/04H01M4/52H01M4/50H01M2/10H01M2/34H01M4/36H01M4/485H01M10/0525H01M10/0569H01M10/46
CPCC01G23/005C01G23/047C01P2002/32C01P2002/72C01P2006/40Y02E60/122H01M4/485H01M10/052H01M10/0569H01M2004/021H01M4/364Y02E60/10H01M10/05H01M2220/20H01M2220/30Y02T10/70
Inventor INAGAKI, HIROKITAKAMI, NORIO
Owner KK TOSHIBA
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