High-performance all-solid lithium battery

An inorganic solid, lithium salt technology, applied in the field of lithium batteries, can solve problems such as inability to operate secondary batteries

Inactive Publication Date: 2009-07-15
IDEMITSU KOSAN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0030] However, if lithium iodide (LiI) is used for the purpose of improving ionic conductivity, since the oxidation potential of this electrolyte is 2.9V, when using a positive electrode active material with a battery action potential of 3V or more, oxidative decomposition will occur reaction, cannot operate as a secondary battery

Method used

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Examples

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Embodiment

[0149] Hereinafter, the present invention will be described in further detail using examples and comparative examples, but the present invention is not limited by these examples.

reference example 1

[0151] (1) Manufacture of lithium sulfide

[0152] Lithium sulfide is produced according to the method of the first embodiment (two-step method) of Patent Document 1.

[0153] Specifically, in a 10-liter autoclave equipped with a stirring paddle, 3326.4 g (33.6 moles) of N-methyl-2-pyrrolidone (NMP) and 287.4 g (12 moles) of lithium hydroxide were added, and the temperature was raised to 130 ℃.

[0154] After the temperature was raised, hydrogen sulfide was blown into the liquid at a supply rate of 3 liters / minute for 2 hours.

[0155] Next, the reaction solution was placed under a stream of nitrogen (200cm 3 / min) is heated up, and a part of the reacted hydrogen sulfide is dehydrogenated.

[0156] As the temperature rises, water by-produced by the reaction of hydrogen sulfide and lithium hydroxide starts to evaporate, but this water is condensed by the condenser and discharged outside the system.

[0157] While the temperature of the reaction solution was raised while wat...

reference example 2

[0168] The impurity content of commercially available lithium sulfide [manufactured by Aldrich Chemical Co., Ltd.] was measured.

[0169] Table 1 shows the obtained results.

[0170] Table 1

[0171]

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Abstract

The invention provides an efficient process for producing a lithium ion conductive inorganic solid electrolyte of high ionic conductivity, comprising carrying out a melting reaction of a lithium sulfide containing a lithium salt of sulfur oxide and lithium N-methylaminobutyrate each in an amount of <= 0.15 mass% with at least one member selected from among diphosphorus pentasulfide, elemental phosphorus and elemental sulfur, rapidly cooling the reaction mixture and further conducting a heat treatment. Further, the invention provides a high-performance lithium battery in which use is made of the above electrolyte. In particular, there is provided a high-performance lithium battery realizing high energy density, usable in a monolayer form, obtained by providing a positive electrode active material of >= 3 V operating potential and a negative electrode active material of <= 0.5 V reduction potential and producing a lithium ion conductive inorganic solid electrolyte to be brought into contact with at least the negative electrode active material from lithium sulfide and at least one component selected from among diphosphorus pentasulfide, elemental phosphorus and elemental sulfur.

Description

technical field [0001] The present invention relates to the use of high-purity lithium sulfide, and more specifically, to a lithium ion conductive inorganic solid electrolyte using lithium sulfide with few impurities such as lithium salt of sulfur oxide and lithium N-methylaminobutyrate (LMAB) A manufacturing method and a lithium battery using the electrolyte. [0002] In addition, the present invention relates to a high-performance all-solid lithium battery using a lithium ion conductive inorganic solid electrolyte made of lithium sulfide and one or more components selected from phosphorus pentasulfide, monomeric phosphorus, and monomeric sulfur as a solid electrolyte, more specifically Specifically, it relates to a lithium battery using a positive electrode active material having an action potential of 3 V or more and a negative electrode active material having a reduction potential (potential of the negative electrode active material) of 0.5 V or less, and as the lithium ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B1/06H01B1/00H01M10/36
Inventor 清野美胜高田和典
Owner IDEMITSU KOSAN CO LTD
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