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Battery

A battery and electrolyte technology, applied in secondary batteries, battery electrodes, lithium batteries, etc., can solve problems such as reduced discharge capacity and reduced cycle performance, and achieve the effects of improving battery performance, preventing reactions, and improving deposition-dissolution efficiency.

Inactive Publication Date: 2007-10-31
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is a problem with lithium secondary batteries: the discharge capacity is greatly reduced when repeated charging and discharging, so it is difficult to put lithium secondary batteries into practical use
In particular, there is a problem that the cycle performance is easily degraded due to the decomposition of the electrolyte or the reaction between the deposited lithium metal and the electrolyte

Method used

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Examples

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Effect test

Embodiment 1-1 to 1-25

[0099] Forming a battery in which the area density ratio of the cathode 21 and the anode 22 has been adjusted, the capacity of the anode 22 includes a capacity component obtained by insertion and extraction of lithium and a capacity component obtained by deposition and dissolution of lithium, and is represented by the sum of the two .

[0100] First, by ratio (molar ratio) Li 2 CO 3 : CoCO 3 =0.5:1 mixed lithium carbonate (Li 2 CO 3 ) and cobalt carbonate (CoCO 3 ), the mixture was sintered at 900°C in air for 5 hours to obtain lithium cobalt composite oxide (LiCoO 2 ) as the cathode material. Next, 91 parts by weight of lithium cobalt composite oxide, 6 parts by weight of graphite as a conductor, and 3 parts by weight of polyvinylidene fluoride as a binder were mixed to prepare a cathode mixture. Then, the cathode mixture was dispersed in N-methyl-2-pyrrolidone as a solvent to generate cathode mixture slurry. After the cathode mixture slurry was unevenly coated on bot...

Embodiment 2-1 to 2-4

[0119] The formation of the secondary batteries of Examples 2-1 to 2-4 was basically the same as that of Examples 1-1 and 1-3, except that vinylene carbonate (VC) or vinylene carbonate was the unsaturated compound carbonate. Ethyl ester (VEC) was added to a mixture of 50% by volume ethylene carbonate and 50% by volume diethyl carbonate. The mass content of vinylene carbonate or vinyl ethylene carbonate in the solvent is 1%.

[0120] As in the case of Example 1-1, in the secondary batteries of Examples 2-1 to 2-4, cycle performance and heavy load performance were determined, and whether or not lithium metal was deposited under fully charged conditions and fully discharged conditions was examined. The results thereof are shown in Table 3 together with the results of Examples 1-1 and 1-3 and Comparative Examples 1-1 to 1-3.

[0121] shown in chemical formula 1

light metal salt

other than chemical formula 1

light metal salt

Carbonate

in...

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Abstract

A battery capable of improving battery characteristics such as cycle characteristics is provided. The battery includes a spirally wound electrode body including a cathode and an anode spirally wound with a separator in between. The capacity of the anode includes a capacity component by insertion and extraction of light metal and a capacity component by precipitation and dissolution of the light metal, and is represented by the sum of them. The separator is impregnated with an electrolyte solution formed through dissolving a lithium salt in a solvent. As the electrolyte salt, difluoro[oxalato-O,O']lithium borate, tetrafluoro[oxalato-O,O']lithium phosphate or difluorobis[oxalato-O,O']lithium phosphate is used. By the formation of a stable coating, decomposition of the solvent and a reaction between precipitated lithium metal and the solvent can be prevented.

Description

technical field [0001] The present invention relates to a battery comprising a cathode, an anode, and an electrolyte, and more particularly, the present invention relates to a battery wherein the anode capacity includes a capacity component obtained by insertion and extraction of light metals and a capacity component obtained by deposition and dissolution of light metals, and is derived from The sum of the two represents the battery. Background technique [0002] In recent years, there has been a strong pursuit to reduce the size and weight of portable electrical equipment typified by cell phones, PDAs (Personal Digital Assistants) or notebook computers, and, as part of the reduction, there has been a strong demand for improved batteries, especially secondary batteries as power sources for these devices. The energy density of the battery. [0003] As secondary batteries that can achieve high energy density, there are listed, for example, lithium io...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/05H01M4/00H01M4/02H01M4/36H01M6/16H01M6/18H01M10/052H01M10/0565H01M10/0568H01M10/0569H01M10/38
CPCH01M10/0587H01M10/0568H01M2300/004H01M10/054H01M10/0565H01M10/0525H01M2300/0025Y02E60/122H01M4/133H01M4/131Y02E60/10Y02P70/50H01M10/0567
Inventor 足立百惠藤田茂青木正裕明石宽之成瀬义明
Owner SONY CORP
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