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All-solid battery system and manufacturing method thereof

An all-solid-state battery and manufacturing method technology, which is applied in the manufacture of electrolyte batteries, lithium batteries, battery electrodes, etc., can solve the problems of low cycle characteristics and increased internal resistance of all-solid batteries, and achieve the effect of improving cycle characteristics

Active Publication Date: 2022-03-15
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is known that a battery using an alloy-based negative electrode active material as a negative electrode active material has lower cycle characteristics than a battery using a carbon-based negative electrode active material or the like as a negative electrode active material.
As its reason, can enumerate: alloy system negative electrode active material particle expands and shrinks during charging and discharging, thus alloy system negative electrode active material particle is pulverized; A gap is created between them, and the internal resistance of the all-solid-state battery increases

Method used

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  • All-solid battery system and manufacturing method thereof
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  • All-solid battery system and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3 and comparative example 1～5

[0113] All solid state batteries of Examples 1 to 3 and Comparative Examples 1 to 5 were produced as follows, and their battery performances were evaluated.

Embodiment 1

[0115] The all-solid-state battery of Example 1 was fabricated and its battery performance was evaluated as follows.

[0116] 1. Fabrication of all-solid-state batteries

[0117] (1) Fabrication of positive electrode active material layer

[0118] A 5 wt% butyl butyrate solution in which butyl butyrate as a dispersion medium and polyvinylidene fluoride as a binder are dissolved, and LiNi as a positive electrode active material coated with lithium niobate as a protective coating 1 / 3 co 1 / 3 mn 1 / 3 o 2 , Li as a solid electrolyte 2 S-P 2 S 5 Glass-ceramics, and VGCF (vapour-processed carbon fiber) as a conductive additive were put into a polypropylene container, and stirred for 30 seconds with an ultrasonic dispersion device (manufactured by Esemite, product name UH-50). Thereafter, the polypropylene container was shaken for 3 minutes with a vibrator (manufactured by Shibata Scientific Co., Ltd., product name TTM-1), and then stirred for 30 seconds with an ultrasonic dispe...

Embodiment 2、3 and comparative example 1～3

[0134] All solid state batteries of Examples 2 and 3 and Comparative Examples 1 to 3 were fabricated by the same method as in Example 1. Thereafter, in addition to setting the initial charging voltage of Example 2 to 4.70V, setting the initial charging voltage of Example 3 to 5.00V, setting the initial charging voltage of Comparative Example 1 to 4.45V, and setting the initial charging voltage of Comparative Example 2 to The battery performance of the all solid state batteries of Examples 2 and 3 and Comparative Examples 1 to 3 was evaluated by the same method as in Example 1 except that the voltage was set to 4.40 V and the initial charging voltage of Comparative Example 3 was set to 3.60 V.

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Abstract

The present invention relates to an all-solid battery system and a manufacturing method thereof. The all-solid battery system comprises an all-solid battery having a positive electrode active material layer (2), a solid electrolyte layer (3) and a negative electrode active material layer (4), and a control device for controlling the charging and discharging voltage of the all-solid battery when in use, Wherein, there are alloy-based negative-electrode active material particles in the negative-electrode active material layer, the amorphization rate of the alloy-based negative-electrode active material particles is 27.8% to 82.8%, and the following conditions are met: 0.32≤the controlled discharge capacity of the all-solid battery (mAh ) / theoretical capacity (mAh / g) of the alloy-based negative electrode active material particles×the total weight (g) of the alloy-based negative electrode active material particles×amorphization rate (%)≦0.60. In addition, the production method includes a lamination step of laminating a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer having alloy-based negative electrode active material particles, and an initial charging step of charging to an initial charge voltage higher than the charge and discharge voltage.

Description

[0001] This application is a divisional application of an invention patent application with an application date of September 14, 2016, an application number of 201610827031.3, and an invention title of "All Solid State Battery System and Its Manufacturing Method". technical field [0002] The present invention relates to an all-solid battery system and a manufacturing method thereof. Background technique [0003] Currently, among various batteries, lithium ion batteries are attracting attention from the viewpoint of high energy density. Among them, all-solid-state batteries in which the electrolyte is replaced by a solid electrolyte are attracting particular attention. This is because an all-solid battery is different from a secondary battery using an electrolytic solution in that the electrolyte is solid and the battery is composed of only solids. Therefore, it is presumed that, for example, decomposition of the electrolytic solution does not occur, and the cycle character...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/38H01M4/40H01M10/0525H01M10/0562H01M10/058
CPCH01M4/134H01M4/38H01M4/40H01M10/0525H01M10/0562H01M10/058H01M10/44H01M10/446Y02E60/10Y02P70/50H01M4/1391H01M4/1395H01M4/366H01M4/386H01M4/505H01M4/525H01M4/62H01M10/052H01M10/0585H01M10/425H01M10/4235H01M4/131H01M4/485H01M2004/027H01M2004/028H02J7/0068
Inventor 大泷光俊大森敬介尾濑德洋长谷川元芳贺健吾
Owner TOYOTA JIDOSHA KK