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Electrolytic solution and battery

An electrolyte and battery technology, which is applied in the field of electrolyte and batteries, can solve the problems of cycle characteristics decline, charge and discharge efficiency drop, electrolyte easy to decompose, etc., and achieve the effect of improving cycle characteristics and inhibiting decomposition reactions

Active Publication Date: 2009-05-06
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] It is well known that even in the case where a carbon material is used as the negative electrode active material, the discharge capacity is improved when the battery voltage is increased; decrease, and the cycle characteristics degrade

Method used

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  • Electrolytic solution and battery
  • Electrolytic solution and battery
  • Electrolytic solution and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1 to 1-5

[0127] form Figure 5 The coin-type secondary battery shown in . This secondary battery was formed through the following steps. The positive electrode 51 and the negative electrode 52 are laminated with a separator 53 impregnated with an electrolytic solution in between, and they are sandwiched between a packing case 54 and a packing cap 55 . Then, the packing case 54 and the packing cap 55 are caulked with the gasket 56 to form a secondary battery. First, 94 parts by weight of lithium cobalt composite oxide (LiCoO 2 ), 3 parts by weight of graphite as an electrical conductor and 3 parts by weight of polyvinylidene fluoride as a binder are mixed to form a mixture, and N-methyl-2-pyrrolidone as a solvent is added to the mixture to form a positive electrode mixed slurry material. Next, the obtained positive electrode mixed slurry was uniformly applied on the positive electrode current collector 51A made of aluminum foil with a thickness of 20 μm, and dried to form the positi...

Embodiment 2-1 to 2-5

[0142] (Example 2-1 to 2-5, 3-1 to 3-5)

[0143] As Examples 2-1 to 2-5, in addition to using tin as the negative electrode active material, a 5 μm thick negative electrode active material layer 52B made of tin is formed by vapor deposition on a 15 μm thick negative electrode current collector made of copper foil. Except on the body 52A, a coin-type secondary battery was formed as in Examples 1-1 to 1-5. At the same time, adjust the filling amount of the positive active material and the negative active material so that the open circuit voltage becomes 4.20V when fully charged, and prevent lithium metal from being precipitated on the negative electrode 52 during the charging process, so that the capacity of the negative electrode 52 is determined by the intercalation and desorption of lithium. Embedded capacity section representation.

[0144] As Examples 3-1 to 3-5, in addition to using CoSnC-containing material powder including indium and titanium as the negative electrode a...

Embodiment 4-1 to 4-4

[0165] In addition to using graphite as the negative electrode active material, and mixing 97 parts by weight of graphite and 3 parts by weight of polyvinylidene fluoride as a binder to form a mixture, and adding N-methyl-2-pyrrolidone to the mixture, And this mixture was uniformly applied on a 15 μm thick negative electrode current collector 52A made of copper foil, and then dried to form a 70 μm thick negative electrode active material layer 52B, as in Example 1-1 to form a coin-shaped secondary Battery. At the same time, the positive active material is lithium-manganese-cobalt-nickel composite oxide (LiMn 0.3 co 02 Ni 0.5 o 2 ). And, adjust the filling amount of positive electrode active material and negative electrode active material so that when fully charged, the open circuit voltage becomes 4.60V in embodiment 4-1, becomes 4.50V in embodiment 4-2, becomes 4.50V in embodiment 4-3 becomes 4.35V in Example 4-4 and becomes 4.25V in Example 4-4. In addition, lithium me...

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Abstract

An electrolytic solution and a battery capable of improving cycle characteristics are provided. A separator is impregnated with an electrolytic solution. The electrolytic solution includes a cyclic carbonate derivative having a halogen atom such as 4-fluoro-1,3-dioxolane-2-one or 4-chloro-1,3-dioxolane-2-one and a cyclic imide salt such as 1,1,2,2,3,3-hexafluoropropane-1,3-disulfonimide lithium. Thereby, the decomposition reaction of the electrolytic solution can be inhibited, and the cycle characteristics can be improved.

Description

[0001] Cross References to Related Applications [0002] The present invention includes the Japanese patent application JP2005-112052 submitted to the Japan Patent Office on April 8, 2005, the Japanese patent application JP2005-116187 submitted to the Japan Patent Office on April 13, 2005, and the Japanese patent application JP2005-116187 submitted to the Japan Patent Office on February 15, 2006 The subject matter of Japanese Patent Application JP2006-37698, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to an electrolytic solution containing an electrolytic salt and a battery using the same. Background technique [0004] In recent years, a large number of portable electronic devices, such as camcorders, digital cameras, cellular phones, personal digital assistants, and laptop computers, have appeared, and attempts have been made to reduce their size and weight. Research and development aimed at impr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M6/16H01G9/028C07D285/00C07D283/00C07D211/88C07D209/48C07D207/444C07D223/10C07D225/00H01B1/12H01M10/0567
CPCY02E60/12H01M10/0567H01M10/0568H01M10/0566Y02E60/10
Inventor 川岛敦道井原将之山口裕之堀内博志窪田忠彦山口晃高木久美子
Owner MURATA MFG CO LTD
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