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Non-aqueous electrolytic solution and non-aqueous electrolyte battery

A non-aqueous electrolyte and electrolyte technology, which is applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolytes, organic electrolytes, etc., can solve the problems of electrolyte volume reduction, active material degradation, and inability to obtain sufficient properties, and achieve excellent storage properties, Excellent cycle characteristics

Inactive Publication Date: 2009-06-10
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems are likely to occur: the active material layer of the electrode is pressurized to increase the density, the amount of electrolyte solution is reduced, and the active material cannot be used uniformly, and a part of lithium is precipitated or accelerated due to uneven reaction. Deterioration of the active material prevents sufficient characteristics from being obtained, and non-aqueous electrolyte secondary batteries using the electrolyte solutions described in Patent Documents 1 to 5 are not satisfactory in terms of both cycle characteristics and high-temperature storage characteristics.

Method used

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  • Non-aqueous electrolytic solution and non-aqueous electrolyte battery
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  • Non-aqueous electrolytic solution and non-aqueous electrolyte battery

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preparation example Construction

[0160] (Preparation of Electrolyte)

[0161] The nonaqueous electrolytic solution of the present invention can be prepared by dissolving at least one compound selected from fluorinated cyclic carbonate compounds having 2 or more fluorine atoms and other compounds as needed in a nonaqueous solvent. When preparing a non-aqueous electrolytic solution, it is preferable to dehydrate each raw material in advance so as to reduce the water content when preparing the electrolytic solution. Usually dehydrated to 50 ppm or less, preferably 30 ppm or less, particularly preferably 10 ppm or less. In addition, dehydration, deacidification, and the like may be performed after the electrolytic solution is prepared.

[0162] The nonaqueous electrolytic solution of the present invention is suitable for use in secondary batteries in nonaqueous electrolyte batteries, that is, suitable for use as an electrolytic solution for nonaqueous electrolyte secondary batteries such as lithium secondary bat...

Embodiment 1

[0215] [production of negative electrode]

[0216] The d value of the lattice plane (002 plane) obtained by X-ray diffraction of 94 parts by weight is 0.336 nm, the crystallite size (Lc) is 652 nm, the ash content is 0.07 wt%, and the median particle size measured by the laser diffraction / scattering method The diameter is 12μm, and the specific surface area measured by BET method is 7.5m 2 / g, the R value (=I B / I A ) is 0.12, located at 1570~1620cm -1 The half-value width of the peak of the range is 19.9cm -1 Natural graphite powder and 6 parts by weight of polyvinylidene fluoride were mixed, and N-methyl-2-pyrrolidone was added to make a slurry. This slurry is evenly coated on one side of copper foil with a thickness of 12 μm and dried, then pressed so that the density of the negative electrode active material layer is 1.65 g / cm 3 , made into a negative electrode.

[0217] [production of positive electrode]

[0218] 90 parts by weight of LiCoO 2 , 4 parts by weight o...

Embodiment 2

[0224] 2 parts by weight of vinylene carbonate and 0.5 parts by weight of cis-4,5-difluoro-1,3-bis Oxolan-2-one, then dissolve well-dried LiPF at a ratio of 1.0 mol / L 6 On the other hand, the prepared electrolytic solution was carried out in the same manner as in Example 1 to produce a sheet-shaped lithium secondary battery, and the cycle characteristics and discharge storage characteristics were evaluated. Table 1 shows the evaluation results.

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Abstract

Nonaqueous electrolytes capable of providing a battery having a high capacity and excellent in storability and cycle characteristics are provided. Also provided are nonaqueous-electrolyte batteries produced with the electrolytes. The nonaqueous electrolytes include ones which (1) contains a cyclic carbonate having an unsaturated bond and further contains a fluorinated cyclic carbonate having two or more fluorine atoms, (2) contains an aromatic compound having 7-18 carbon atoms in total and further contains a fluorinated cyclic carbonate having two or more fluorine atoms, (3) contains diethyl carbonate and further contains a fluorinated cyclic carbonate having two or more fluorine atoms, or (4) contains at least one compound selected from the group consisting of cyclic sulfonic acid ester compounds, di-sulfonic acid ester compounds, nitrile compounds, and compounds represented by general formula (1) and further contains a fluorinated cyclic carbonate having two or more fluorine atoms. The electrolytes further include (5) a nonaqueous electrolyte characterized by being an electrolytic solution for use in a high-voltage battery having a final charge voltage of 4.3 V or higher and containing a fluorinated cyclic carbonate having two or more fluorine atoms.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution and a nonaqueous electrolytic battery using the nonaqueous electrolytic solution. Background technique [0002] Non-aqueous electrolyte batteries such as lithium secondary batteries are being put into practical use in a wide range of applications ranging from so-called consumer power supplies such as mobile phones and notebook computers to vehicle-mounted power supplies for driving vehicles. However, in recent years, there has been an increasing demand for higher performance of non-aqueous electrolyte batteries, and improvements in battery characteristics have been eagerly desired. [0003] An electrolytic solution used in a nonaqueous electrolyte battery is usually mainly composed of an electrolyte and a nonaqueous solvent. As the main component of non-aqueous solvents, cyclic carbonates such as ethylene carbonate or propylene carbonate; chain carbonates such as dimethyl carbonate, d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/0525H01M10/0566H01M10/0567H01M10/36
CPCH01M10/0567Y02E60/122H01M2300/0025H01M10/0525H01M10/052H01M10/0566Y02E60/10H01M10/05H01M10/0569H01M6/168
Inventor 古田土稔木下信一
Owner MITSUBISHI CHEM CORP
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