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non-aqueous electrolyte battery

A non-aqueous electrolyte and battery technology, applied in the direction of non-aqueous electrolyte batteries, lithium batteries, battery electrodes, etc., can solve the problem of battery safety reduction

Active Publication Date: 2019-10-18
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the excessive intercalation of Li in lithium titanate will be the main reason for reducing the safety of the battery.

Method used

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Experimental program
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Effect test

Embodiment approach

[0022] According to an embodiment, there is provided a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a negative electrode, a positive electrode, and a nonaqueous electrolyte. The negative electrode contains negative electrode active material particles. The negative electrode active material particles contain spinel lithium titanate. The negative electrode has the following surface state: the Li atom existence ratio A obtained by photoelectron spectroscopy on the surface Li Ratio A with Ti atoms Ti Ratio A Li / A Ti In the charge-discharge cycle test in a 45° C. environment, the rate increases at a rate of 0.002 or more and 0.02 or less per cycle. The charge-discharge cycle test is carried out in an environment of 45°C and a rate of 2C, within a voltage range with the lower limit of the battery voltage being 1.5±0.1V and the upper limit of the battery voltage being 2.7±0.1V.

[0023] Among them, Li atom existence ratio A Li Calculated from th...

Embodiment 1

[0118] In Example 1, the nonaqueous electrolyte battery of Example 1 was produced by the following procedure.

[0119]

[0120] Lithium nickel cobalt oxide (LiNi 0.8 co 0.2 o 2 ) powder 91% by weight, acetylene black 2.5% by weight, graphite 3% by weight and polyvinylidene fluoride (PVdF) 3.5% by weight were added to N-methylpyrrolidone and mixed to prepare a slurry. The slurry was coated on both sides of a current collector made of aluminum foil with a thickness of 15 μm, dried, and then produced with a density of 3.0 g / cm by pressing. 3 The positive electrode of the positive electrode layer. Ratio t of the thickness of the positive electrode composite material layer to the thickness of the positive electrode current collector C / t CC is 5.5.

[0121]

[0122] As a negative electrode active material, a spinel-type lithium titanate (Li 4 Ti 5 o 12 )powder. This spinel lithium titanate was synthesized as follows. First, 53g of tetrabutoxytitanium (Ti(C 4 h 9 O)...

Embodiment 2

[0151] In Example 2, lithium bis(trifluoromethanesulfonyl)acyl The nonaqueous electrolyte battery of Example 2 was fabricated in the same manner as in Example 1 except that imine (LiTFSI) was dissolved at a concentration of 1.0 mol / L to prepare a nonaqueous electrolyte solution.

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Abstract

According to one embodiment, there is provided a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a negative electrode, a positive electrode, and a nonaqueous electrolyte. The negative electrode contains negative electrode active material particles. The negative electrode active material particles contain spinel lithium titanate. The negative electrode has the following surface state: the Li atom existence ratio A obtained by photoelectron spectroscopy on the surface Li Ratio A with Ti atoms Ti Ratio A Li / A Ti In the charge-discharge cycle test in a 45° C. environment, the rate increases at a rate of 0.002 or more and 0.02 or less per cycle. Li atom existence ratio A Li Calculated from the peak derived from the 1s orbital of Li appearing in the binding energy range of 52eV to 58eV. Ti atom existence ratio A Ti Calculated from the peak derived from the 2p orbital of Ti appearing in the binding energy region of 455eV to 462eV.

Description

technical field [0001] Embodiments of the present invention relate to nonaqueous electrolyte batteries. Background technique [0002] In recent years, for example, using the chemical formula Li 4 Ti 5 o 12 The lithium-ion secondary battery in which lithium titanate is used as the negative electrode active material is shown. Since lithium titanate is an insulator in a discharged state, such a battery has the advantage of being highly safe against internal short-circuits compared to lithium-ion secondary batteries using a carbon-based negative electrode. On the other hand, lithium titanate undergoes a reduction reaction caused by excessive intercalation of Li when overcharged. When such a reduction reaction occurs, the potential of the negative electrode suddenly drops, and a side reaction between the negative electrode and the electrolytic solution rapidly occurs. Such a side reaction that occurs rapidly raises the temperature inside the battery due to rapid heat generat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/36H01M4/485H01M10/0525H01M10/0568
CPCH01M4/131H01M4/0404H01M4/0416H01M4/1391H01M4/366H01M4/628H01M10/049H01M10/052H01M10/0566H01M10/4235H01M2004/021H01M4/485Y02E60/10Y02P70/50H01M10/0525H01M10/0568
Inventor 栗山博道猿渡秀乡佐竹秀喜山本大
Owner KK TOSHIBA