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Sulfide-based lithium-ion-conducting solid electrolyte glass, all-solid lithium secondary battery, and method for manufacturing all-solid lithium secondary battery

A solid electrolyte, lithium secondary battery technology, used in secondary batteries, battery electrodes, non-metallic conductors, etc., can solve problems such as low operating voltage, avoid electrical short circuits, high industrial value, and excellent charge-discharge cycle life. Effect

Inactive Publication Date: 2009-07-29
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is impossible to use a charge-discharge reactive material with a high potential as a positive electrode active material, and it can only be made into an all-solid lithium secondary battery with a low operating voltage.

Method used

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  • Sulfide-based lithium-ion-conducting solid electrolyte glass, all-solid lithium secondary battery, and method for manufacturing all-solid lithium secondary battery
  • Sulfide-based lithium-ion-conducting solid electrolyte glass, all-solid lithium secondary battery, and method for manufacturing all-solid lithium secondary battery
  • Sulfide-based lithium-ion-conducting solid electrolyte glass, all-solid lithium secondary battery, and method for manufacturing all-solid lithium secondary battery

Examples

Experimental program
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Effect test

Embodiment approach 1

[0074] The sulfide-based lithium ion conductive solid electrolyte used in Embodiment 1 is a glassy electrolyte formed by containing α-alumina in the sulfide-based lithium ion conductive solid electrolyte. For example Li 2 S-SiS 2 , Li 2 S-SiS 2 -LiI, Li 2 S-SiS 2 -LiBr, Li 2 S-SiS 2 -LiCl, Li 2 S-SiS 2 -B 2 S 3 -LiI, Li 2 S-SiS 2 -P 2 S 5 -LiI, Li 2 S-B 2 S 3 , Li 2 S-B 2 S 3 -LiI, Li 2 S-P 2 S 5 , Li 2 S-P 2 S 5 -LiI, Li 2 S-P 2 S 5 -ZmSn (Z=Ge, Zn, Ga), Li 2 S-GeS 2 , Li 2 S-SiS 2 -Li 3 PO 4 , Li 2 S-SiS 2 -LixPOy (M=P, Si, Ge, B, Al, Ga, In)-based sulfide lithium ion conductive solid electrolyte glass and crystalline lithium ion conductors containing these components or lithium ions formed from mixtures thereof Conductive solid electrolyte.

[0075] Next, α-alumina having a particle size of 10 μm or less is mixed and used as insulating fine particles in these sulfide-based lithium ion conductive solid electrolytes as a matrix. The α-al...

Embodiment 1

[0084] Here, by Li 2 S-SiS 2 -Li 3 PO 4 The formed lithium ion conductive glass was used as a starting material, that is, a sulfide-based lithium ion conductor, and a new glass obtained by mixing α-alumina as insulating fine particles at a weight ratio of 7% was formed by the method described in 1) above. Sulfide-based lithium ion conductive solid electrolyte glass.

[0085] The obtained sulfide-based lithium-ion conductive solid electrolyte glass was pulverized with a planetary ball mill to an average particle size of about 7 microns, and the obtained solid electrolyte powder was filled into a cylinder having a diameter of 1 cm and having an ion conductivity measurement unit. Forming fixture made of alumina, at 2 tons / cm 2 Formed under high pressure. In this pressurization, press molding is performed while heating the jig to the softening temperature range (approximately 200°C to 320°C) of the sulfide-based lithium ion conductive solid electrolyte glass (heating time is ...

Embodiment 2

[0091] Here, in order to analyze the relationship between the heating of the electrolyte glass used in Example 1 and the heating temperature and time in compression molding, an electrolyte glass molded body was produced in the same manner, its conductivity was measured, and its appearance was observed. However, the molding pressure used here is the same as in Example 1, which is 2 tons / cm 2 . The obtained results are combined and shown in Figure 11 . From this result, it can be seen that when the heating temperature is heated and compressed in the temperature range of 180° C. to 350° C., if the treatment time is within 6 hours, the ion conductivity of all glass molded objects is 1×10 -3 S / cm 2 above. However, when the treatment temperature is 300° C., if the treatment time exceeds 5 hours, the ion conductivity slightly decreases in this temperature range. It can be seen that the treatment temperature is preferably in the temperature range of 200°C to 300°C, and the treat...

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Abstract

The present invention discloses a all-solid lithium secondary battery that has large chare and discharge output current denseness and excellent charge and discharge cycle life which can be easily manufactured at low cost. In the manufacturing process of the all-solid lithium secondary battery, a new lithium ion conductor with ionic conduction improved can be obtained through vitrification to mixed electrolytes by mixing Alpha-oxide of alumina in various sulfide system lithium ion conductivity solid electrolyte. The electrolytes layer 8 used the lithium ion conductor, and positive and negative electrode (I), (II) are formed by positive and negative electrode material 3, 7 are constituted. Subsequently, cascading at least 1 layer in positive and negative electrode (I), (II) with electrolytes layer, and producing battery while electrolytes not crystallizes by heating and compressing as a whole.

Description

technical field [0001] The present invention relates to a sulfide-based lithium ion conductive solid electrolyte glass, an all-solid lithium secondary battery, and a method for manufacturing the all-solid lithium secondary battery. Background technique [0002] In recent years, with the development of portable devices such as personal computers and mobile phones, there is a great demand for small and lightweight secondary batteries as their power sources. Among secondary batteries, especially lithium secondary batteries have high energy density because lithium has a small atomic weight and high ionization energy. Therefore, research on such batteries is very active, and they are now used in a wide range of applications including power supplies for portable devices. [0003] The above-mentioned lithium secondary batteries can be roughly divided into lithium ion batteries using liquid electrolytes, lithium ion polymer batteries using polymer solid electrolytes, or lithium ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M10/38H01M2/08H01B1/06H01M4/139H01M10/0562
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 筱原祐治川濑健夫近藤繁雄
Owner SEIKO EPSON CORP
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