Non-aqueous electrolyte and power storage device using same

A technology of non-aqueous electrolyte and power storage device, applied in non-aqueous electrolyte batteries, non-aqueous electrolyte batteries, non-aqueous electrolytes, etc., can solve problems such as the reduction of electrochemical properties, and achieve the effect of improving electrochemical properties

Inactive Publication Date: 2015-01-14
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a situation in which the electrochemical characteristics when used in a wide temperature range are easily reduced due to a small amount of decomposition of the non-aqueous electrolyte.

Method used

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  • Non-aqueous electrolyte and power storage device using same
  • Non-aqueous electrolyte and power storage device using same
  • Non-aqueous electrolyte and power storage device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0277] Examples of electrolytic solutions using the lithium salt of the present invention and synthesis examples of compounds are shown below, but the present invention is not limited to these examples and synthesis examples.

[0278] A. Next, the effect of adding the lithium salt represented by the general formula (XI-1) or (XIII-1) will be described in detail by way of examples.

Embodiment A-1～A-34、 comparative example A-1

[0280] 〔Manufacture of lithium-ion secondary battery〕

[0281] 94 mass% LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 (the pH of the supernatant when 10 g of the positive electrode active material is dispersed in 100 ml of distilled water is 10.8), 3 mass % of acetylene black (conductive agent) is mixed, and added to the previously made 3 mass % polyvinylidene fluoride (Binder) was dissolved in 1-methyl-2-pyrrolidone and mixed to prepare a positive electrode mixture paste. This positive electrode mixture paste was applied to one side of an aluminum foil (current collector), dried, pressurized, and punched into a predetermined size to produce a positive electrode sheet. The density of the part of the positive electrode other than the current collector is 3.6 g / cm 3 .

[0282] In addition, 95% by mass of artificial graphite (d 002 =0.335 nm, negative electrode active material) was added to a solution obtained by dissolving 5% by mass of polyvinylidene fluoride (binder) in 1-methyl-2-pyrroli...

Embodiment A-35～A-36、 comparative example A-2

[0306] The negative electrode active material used in Example A-1 was changed, and silicon (simple substance) (negative electrode active material) was used to produce a negative electrode sheet. Mix 80% by mass of silicon (single substance) and 15% by mass of acetylene black (conductive agent), and add to 1-methyl-2-pyrrolidone that has previously dissolved 5% by mass of polyvinylidene fluoride (binder) and mixed in the obtained solution to prepare negative electrode mixture paste. This negative electrode mixture paste is coated on the copper foil (current collector), dried, pressurized and punched into a specified size, a negative electrode sheet is made, and the composition of the non-aqueous electrolyte is changed to a specified composition. Otherwise, a coin battery was produced in the same manner as in Example A-1, and battery evaluation was performed. The results are shown in Table 4.

[0307] Table 4

[0308]

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Abstract

The present invention relates to [1] a non-aqueous electrolyte in which electrolyte salt is dissolved in a non-aqueous solvent, the non-aqueous electrolyte containing between 0.001 and 5 mass% of a specific acyclic lithium salt and being capable of improving electrochemical properties over a wide temperature range, and [2] a power storage device provided with a positive electrode, a negative electrode, and the non-aqueous electrolyte in which electrolyte salt is dissolved in the non-aqueous solvent, the power storage device containing between 0.001 and 5 mass% of a specific acyclic lithium salt in the non-aqueous electrolyte.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution capable of improving electrochemical characteristics in a wide temperature range and an electrical storage device using the nonaqueous electrolytic solution. Background technique [0002] In recent years, electrical storage devices, particularly lithium secondary batteries, have been widely used as power sources for small electronic devices such as mobile phones and notebook computers, as well as power sources for electric vehicles and power storage. Since these electronic devices and automobiles are likely to be used in a wide temperature range such as high temperatures in midsummer or very cold low temperatures, it is necessary to improve electrochemical characteristics in a well-balanced manner over a wide temperature range. [0003] Especially in order to prevent global warming, reduce CO 2 Emissions have become a top priority, and among environment-friendly vehicles equipped with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M4/485H01M4/58H01M6/16H01M10/052H01M10/0525H01M10/0568H01M10/0569H01G11/54
CPCH01M10/0567Y02E60/122Y02T10/7022Y02E60/13H01M10/0569H01G11/60H01M10/0525Y02T10/7011H01M10/0568H01G11/62Y02T10/70Y02E60/10H01M10/052H01G11/54H01M2300/0025H01M2300/0028
Inventor 岛本圭古藤雄一敷田庄司
Owner UBE IND LTD
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