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Non-aqueous electrolyte solution and electricity storage device in which same is used

一种非水电解液、蓄电设备的技术，应用在非水电解质蓄电池、非水电解质电池、非水电解质等方向，能够解决电池性能下降等问题，达到提高放电容量维持率、改善低温输入特性的效果

Active Publication Date: 2017-03-01
MU IONIC SOLUTIONS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the situation is that the battery performance at high temperature tends to decrease due to the decomposition of a small amount of non-aqueous electrolyte

Method used

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  • Non-aqueous electrolyte solution and electricity storage device in which same is used
  • Non-aqueous electrolyte solution and electricity storage device in which same is used
  • Non-aqueous electrolyte solution and electricity storage device in which same is used

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～12、 comparative example 1～5

[0152] 〔Manufacture of lithium-ion secondary battery〕

[0153] 94 mass% LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 , 3% by mass of acetylene black (conductive agent) were mixed, added to the solution obtained by dissolving 3% by mass of polyvinylidene fluoride (binder) in 1-methyl-2-pyrrolidone in advance and mixed to prepare Positive electrode mixture paste. This positive electrode mixture paste was applied to one side of an aluminum foil (current collector), dried and pressurized, and then cut into a predetermined size to produce a strip-shaped positive electrode sheet. The density of the part of the positive electrode other than the current collector is 3.6 g / cm 3 .

[0154] In addition, 10% by mass of silicon (single substance), 80% by mass of artificial graphite (d 002 =0.335nm, negative electrode active material), 5% by mass of acetylene black (conductive agent) are mixed, added to make 5% by mass of polyvinylidene fluoride (binder) dissolved in 1-methyl-2-pyrrolidone in advance ...

Embodiment 13 and comparative example 6、7

[0184] Lithium manganate nickel salt (LiNi 1 / 2 mn 3 / 2 o 4 ) (positive electrode active material) instead of the positive electrode active material used in Example 1 and Comparative Examples 1 and 2, to produce a positive electrode sheet.

[0185] Mix 94% by mass of lithium nickel manganate and 3% by mass of acetylene black (conductive agent), and add 3% by mass of polyvinylidene fluoride (binder) into 1-methyl-2-pyrrolidone in advance The resulting solution was mixed to prepare a positive electrode mixture paste.

[0186] This positive electrode mixture paste was applied to one side of the aluminum foil (current collector), dried and pressurized, and then cut into a predetermined size to make a positive electrode sheet. The end-of-charge voltage at the time of battery evaluation was set to 4.9 V, except that the end-of-discharge voltage was set to 2.7 V, laminated batteries were produced in the same manner as in Example 1 and Comparative Example 1, and battery evaluation wa...

Embodiment 14 and comparative example 8、9

[0190] Lithium titanate (Li 4 Ti 5 o 12 ) (negative electrode active material) instead of the negative electrode active material used in Example 1 and Comparative Examples 1 and 2, to produce a negative electrode sheet.

[0191]Mix 80% by mass of lithium titanate and 15% by mass of acetylene black (conductive agent), and add to 1-methyl-2-pyrrolidone by dissolving 5% by mass of polyvinylidene fluoride (binder) in advance. solution and mixed to prepare negative electrode mixture paste.

[0192] This negative electrode mixture paste is applied to one side of the copper foil (current collector), dried and pressurized, then cut into a predetermined size to make a negative electrode sheet, and the final charge voltage during battery evaluation is set to 2.8V, except that the end-of-discharge voltage was set at 1.2V, and the composition of the nonaqueous electrolyte was changed to a predetermined composition, laminated batteries were produced in the same manner as in Example 1 an...

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Abstract

Provided are an electricity storage device and a non-aqueous electrolyte solution in which an electrolyte salt is dissolved in a non-aqueous solvent, the non-aqueous electrolyte solution being characterized in that the electrolyte salt contains: at least one first lithium salt selected from among LiPF6, LiBF4, LiN(SO2F)2, LiN(SO2CF3)2, and LiN(SO2C2F5)2; and at least one second lithium salt selected from among lithium salts having an oxalic acid skeleton, lithium salts having a phosphoric acid skeleton, and lithium salts having an S=O group, there being at least four first lithium salts and second lithium salts in total. This non-aqueous electrolyte solution not only makes it possible to improve the high-temperature electrochemical characteristics even for a high-density electrode, and to further improve the discharge capacity retention rate and low-temperature output characteristics after high-temperature storage testing, but also makes it possible for low-temperature input characteristics to be improved.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution excellent in electrochemical properties at high temperature and an electrical storage device using the nonaqueous electrolytic solution. Background technique [0002] In recent years, power storage devices, especially lithium secondary batteries, have been widely used as power sources for small electronic devices such as mobile phones and notebook computers, electric vehicles, and power sources for power storage. [0003] Batteries installed in these electronic devices or automobiles are likely to be used in high summer temperatures or in environments where the heat generated by electronic devices becomes hot. In addition, in thin electronic devices such as tablet terminals and ultrabooks, laminated batteries or square batteries in which laminated films such as aluminum laminated films are used for outer packaging parts are often used. However, these batteries are thin and Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01G11/06H01G11/62H01M6/16H01M10/052H01M10/0569
CPCH01G11/06H01G11/62H01M10/052H01M10/0568H01M6/16H01M10/0569H01G11/60Y02T10/70Y02E60/10H01M10/4235H01M6/162H01M2300/0037Y02E60/13H01M10/0525H01M10/0562H01M2300/0042H01M2300/0091
Inventor 安部浩司岛本圭
Owner MU IONIC SOLUTIONS CORP
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