Secondary Battery

A secondary battery and electrolyte technology, applied in secondary batteries, secondary battery manufacturing, secondary battery parts, etc., can solve problems such as electrolyte decomposition, battery damage to battery safety, etc.

Inactive Publication Date: 2016-03-16
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a state, the positive electrode or the negative electrode is in a thermally unstable state, and causes decomposition of the electrolytic solution and abnormal heat generation, and the occurrence of abnormal heat generation of the battery causes a problem of compromising the safety of the battery
Such problems become especially significant as the energy density of non-aqueous electrolyte secondary batteries increases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1-1 to 1-9-6

[0131] In Examples 1-1-1 to 1-4-6, 100% of LiCoO was used in the positive electrode 2 As a lithium composite oxide; use a polypropylene / polyethylene / polypropylene three-layer separator (PP / PE / PP three-layer separator) as a separator; and add additives as shown in Table 1 to the electrolyte. The upper limit charging voltage is set at 4.25 to 4.60V.

[0132] In Examples 1-5-1 to 1-8-6, secondary batteries were prepared in the same manner as in Examples 1-1-1 to 1-4-6 except that a polyethylene separator (PE separator sheet) as a spacer.

[0133] In Examples 1-9-1 to 1-9-6, secondary batteries were produced in the same manner as in Examples 1-1-1 to 1-4-6 except that cyclohexylbenzene was used as an additive.

Embodiment 2-1-1 to 2-1-8

[0148] Secondary batteries were prepared in the same manner as in Example 1-5-3 and Example 1-7-3 except that the separator used was changed to those shown in Table 2 below. The results obtained by evaluating the characteristics of the respective secondary batteries of Examples 2-1-1 to 2-1-8 are shown in Table 2 below.

[0149] Table 2

[0150]

[0151] It can be found from Table 2 that PP-blended PE separator, PTFE / PE / PTFE separator, Al 2 o 3 - Coated PE separator, or SiO 2 -In all of the examples 2-1-1 to 2-1-8 of the PE release sheet of the coating, compared with the example 1-5-3 and the example 1-7-3 using the PE release sheet, it shows Excellent continuous charging characteristics. Also, other properties are equivalent.

[0152] Also, referring to Table 1, in a battery in which a PE separator is used and 1-cyclohexyl-2-fluorobenzene or 1-cyclohexyl-4-fluorobenzene is added, in the case where charging is performed while controlling the upper limit voltage to 4.20...

Embodiment 3-1-1 to 3-3-5

[0155] Secondary batteries were prepared in the same manner as in Example 1-1-3, except that the amounts and kinds of additives added to the electrolytic solution were changed as shown in Table 3 below. The results obtained by evaluating the characteristics of each of the secondary batteries of Examples 3-1-1 to 3-3-5 are shown in Table 3 below.

[0156] table 3

[0157]

[0158] From Table 3, it can be found that in all the examples in which the amount of 1-cyclohexyl-2-fluorobenzene or 1-cyclohexyl-4-fluorobenzene added to the electrolytic solution was in the range of 0.1 to 20% by mass In 3-1-1 to 3-2-5, compared with Comparative Example 1-5-3 in which no additive was added, satisfactory results could be obtained. Furthermore, it was found that in Examples 3-3-1 to 3-3-5 in which equal amounts of 1-cyclohexyl-2-fluorobenzene and 1-cyclohexyl-4-fluorobenzene were added to the electrolytic solution, When the concentration of each of these additives in the electrolyte fal...

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Abstract

A secondary battery is disclosed. The secondary battery includes a positive electrode, a negative electrode, a separator intervening therebetween and an electrolytic solution. The secondary battery has an open circuit voltage in a fully charged state per a pair of the positive electrode and the negative electrode in the range of 4.25 V or more and not more than 6.00 V, and the electrolytic solution contains at least one kind of an aromatic compound represented by the following formula (1): wherein R1 to R10 each independently represents hydrogen, a halogen group, an alkyl group, a halogenated alkyl group, an aryl group or a halogenated aryl group.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 200710162885.5 filed on October 16, 2007, entitled "Secondary Battery". [0002] Cross References to Related Applications [0003] The present invention contains subject matter related to Japanese Patent Application JP2006-281529 filed in the Japan Patent Office on October 16, 2006, the entire content of which is hereby incorporated by reference. technical field [0004] The present invention relates to a secondary battery having an open circuit voltage of 4.25 V or higher per pair of positive and negative electrodes in a fully charged state. Background technique [0005] In recent years, due to the remarkable development of portable electronic technology, electronic devices such as mobile phones and notebook personal computers have come to be considered as basic technologies supporting a high-level information society. Also, research and development on these electronic devices that are hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/04H01M2/16H01M2/34H01M4/02H01M4/36H01M10/05H01M10/052H01M10/0568H01M10/0569H01M10/058
CPCH01M10/04H01M10/0567H01M2300/0025H01M4/02H01M4/505H01M4/525H01M10/0525H01M10/0564H01M10/0565H01M2004/021H01M2300/0085Y10T428/24744Y02E60/10Y02P70/50H01M10/02H01M10/05
Inventor 村上隆小西阳介洼田忠彦
Owner MURATA MFG CO LTD
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