JPH10214640A - Battery - Google Patents

Battery

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Publication number
JPH10214640A
JPH10214640A JP9016925A JP1692597A JPH10214640A JP H10214640 A JPH10214640 A JP H10214640A JP 9016925 A JP9016925 A JP 9016925A JP 1692597 A JP1692597 A JP 1692597A JP H10214640 A JPH10214640 A JP H10214640A
Authority
JP
Japan
Prior art keywords
active material
free acid
battery
positive electrode
adsorption layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9016925A
Other languages
Japanese (ja)
Inventor
Tomoko Okuda
Masaya Yamashita
倫子 奥田
昌哉 山下
Original Assignee
Asahi Chem Ind Co Ltd
旭化成工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Chem Ind Co Ltd, 旭化成工業株式会社 filed Critical Asahi Chem Ind Co Ltd
Priority to JP9016925A priority Critical patent/JPH10214640A/en
Publication of JPH10214640A publication Critical patent/JPH10214640A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation
    • Y02E60/122Lithium-ion batteries

Abstract

PROBLEM TO BE SOLVED: To prevent capacity reduction resulting from the repetition of charge and discharge cycles or storage in a lithium ion secondary battery which uses lithium manganese oxide as positive active material. SOLUTION: A free acid adsorption layer 1c is formed on a positive active material layer 1b. The free acid adsorption layer 1c is formed by evaporating solvent after, for example, α-Al2 O3 fine particles of 1.0μm in average particle diameter are dispersed together with a binder in the solvent, and the same is uniformly applied to the surface of the positive active material 1b. The separator 3 is interposed between the free acid adsorption layer 1c of a positive electrode 1 and the active material layer 2b of a negative electrode so as to assemble the battery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a battery having excellent cycle characteristics and storage characteristics.

[0002]

2. Description of the Related Art In recent years, the development of high-performance batteries has been actively promoted in accordance with demands for smaller, lighter, multifunctional, and cordless electronic devices. Among them, a lithium ion secondary battery using a non-aqueous electrolyte has a high voltage, a high capacity, and a high output, but is light in weight, and thus is building a large market.

In such a lithium ion secondary battery,
As the positive electrode active material, lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, or the like can be used. Among them, the lithium cobalt oxide and the lithium nickel oxide have a problem that the raw material cost is high because the cobalt compound and the nickel compound as starting materials are expensive. Therefore, it is preferable that a lithium manganese oxide with low material cost be used as the positive electrode active material.

However, LiMnO 2 and LiMn 2
When a lithium manganese oxide such as O 4 is used as the positive electrode active material, the initial discharge capacity is considerably large, but there is a problem that the capacity is reduced with repeated charge and discharge. It has also been found that this capacity reduction also occurs with storage.

One of the causes of the decrease in capacity is that hydrofluoric acid is liberated by decomposition of an electrolyte such as LiPF 6 contained in the electrolytic solution on the surface of the positive electrode during charging and discharging, and this hydrofluoric acid is used as the positive electrode active material. It is conceivable to dissolve the material lithium manganese oxide. In particular, at high temperatures, the generation of free acid is promoted, and this tendency becomes stronger. Also, lithium manganese oxide reacts with the electrolyte in the charged state,
It is considered as one of the causes.

In order to prevent such a decrease in capacity, a method of adding a powder such as Al 2 O 3 to an electrolytic solution (see Japanese Patent Application Laid-Open No. 4-284372), or a method of adding Al 2 O 3 to lithium manganese oxide A method has been proposed in which the stability of a charged positive electrode active material is increased by using a material to which a powder such as that described above is added as a positive electrode active material (see JP-A-8-31407).

[0007]

However, if a powder such as Al 2 O 3 is dispersed in the electrolyte, clogging is likely to occur in the injection device when the electrolyte is injected into the battery can. Not preferred. Also, Al 2 O 3 which is an insulating material
The presence of in the positive electrode active material may increase the electrode resistance and affect the charge / discharge performance.

The present invention has been made in view of such problems of the prior art. In a lithium ion secondary battery using lithium manganese oxide as a positive electrode active material, repetition and storage of charge / discharge cycles are performed. It is an object of the present invention to provide a battery in which the capacity is prevented from being reduced due to aging and the battery has excellent charge / discharge characteristics.

[0009]

Means for Solving the Problems In order to solve the above problems, the invention according to claim 1 is directed to a battery provided with a laminate comprising a positive electrode, a negative electrode, and a separator interposed between the two electrodes. A free acid-adsorbing layer made of an insulating material separate from the separator, having pores through which ions can pass, and capable of adsorbing free acid generated from the electrolytic solution,
Provided is a battery, which is interposed between a positive electrode active material and a separator.

In this battery, since the free acid generated from the electrolyte is adsorbed by the free acid adsorption layer, the positive electrode active material is prevented from being dissolved in the free acid. The free acid adsorption layer is
The porosity is preferably 20% or more and 80% or less in a dry state in order not to hinder ion conduction during charge and discharge between the positive and negative electrodes.

As the separator, the same separator as used in conventional batteries can be used. That is, it is not particularly limited as long as it has a high ion permeability and an insulating property having a predetermined mechanical strength. For example, an olefin-based polymer such as polypropylene, or glass fiber, or a sheet made of polyethylene or the like can be used. Nonwoven fabrics and the like can be mentioned. The thickness of the separator is, for example, 5 to 100 μm as in the case of the conventional battery.
m.

According to a second aspect of the present invention, in the battery of the first aspect, the insulating material forming the free acid adsorption layer is MgO, Al 2
It is characterized by being at least one oxide selected from O 3 , CaO, and BaO.

MgO, Al 2 O 3 , CaO, and Ba
O can adsorb a large amount of free acid in the electrolytic solution, and therefore has a high free acid adsorption action by the free acid adsorption layer. According to a third aspect of the invention, in the battery of the first or second aspect, the free acid adsorption layer is fixed to the positive electrode active material side.

[0014] The method of fixing the free acid adsorption layer to the positive electrode active material side
As a method, for example, MgO, Al TwoOThree, CaO, ma
Or particles such as BaO or the like and a binder are dispersed in a solvent.
After applying this uniformly on the surface of the positive electrode active material layer, the solvent is removed.
There is a method of evaporating.

The binders usable in this case include latex (eg, styrene-butadiene copolymer latex, acrylonitrile-butadiene copolymer latex), cellulose derivatives (eg, sodium salt of carboxymethylcellulose), fluororubber (eg, , A copolymer of vinylidene fluoride, hexafluoropropylene, and tetrafluoroethylene), and a fluororesin (eg, polyvinylidene fluoride, polytetrafluoroethylene), and the like.

Examples of the solvent include ethyl acetate, ethylene glycol monoethyl ether (ethyl cellosolve), 1-methyl-2-pyrrolidone (NMP), water and the like.

According to a fourth aspect of the invention, in the batteries of the first to third aspects, the positive electrode active material is lithium manganese oxide;
The negative electrode is capable of storing and releasing lithium in an ion state, and the electrolyte is characterized in that an electrolyte made of a compound containing at least lithium and fluorine is dissolved in an organic solvent.

In this battery, during charging and discharging, hydrofluoric acid having a large power for dissolving lithium manganese oxide is liberated.
Since the hydrofluoric acid is adsorbed by the free acid adsorption layer, the function of the free acid adsorption layer is effectively exhibited.

The lithium manganese oxide is Li (1 + X) Mn (2-X) O 4 having a spinel structure, and the material of the positive electrode active material satisfying 0.05 ≦ x ≦ 0.18 It is more preferable that 0.07 ≦ x ≦ 0.16.

As a manganese raw material for lithium manganese oxide, for example, EMD (Electrolytic M) is used.
angane Dioxide), CMD (Chemi
cal Mangane Dioxide), γ-Mn
OOH can be mentioned, and among them, EMD is preferable. Examples of lithium raw materials include Li 2 CO 3 , L
iOH, LiCl, LiNO 3 , Li 2 SO 4 , CH 3
COOLi, among which Li 2 CO
3 is preferred.

The lithium manganese oxide is, for example, EMD and Li milled to have an average particle size of 5 to 25 μm.
After mixing 2 CO 3 so that (Mn / Li) = 0.5, heat treatment is performed in the air at 800 to 900 ° C., and after cooling to around room temperature, Li 2 is adjusted to a desired Li amount.
It can be obtained by adding and mixing CO 3 and heat-treating at 600 to 650 ° C.

Further, the pulverized EMD and Li 2 CO 3 are
It can also be obtained by previously mixing at a desired ratio (Mn / Li) and performing a heat treatment. The negative electrode is capable of storing and releasing lithium in an ion state.
Examples include carbonaceous materials such as coke, graphite, and amorphous carbon, metal oxides such as SiSnO, and metal nitrides such as LiCoN 2 .

The electrolyte is obtained by dissolving an electrolyte composed of a compound containing at least lithium and fluorine in an organic solvent. Examples of the electrolyte include LiBF 4 , LiBF
AsF 6 , CF 3 SO 3 Li, (CF 3 SO 2 ) 2 N ·
Li, LiPF 6 and the like are used, and either one of them is used alone or two or more kinds are mixed and used.

Examples of the organic solvent include cyclic carbonates such as propylene carbonate and ethylene carbonate, cyclic lactones such as γ-butyrolactone, chain carbonates such as dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate, and 1,2- Ethers such as dimethoxyethane, 1,2-diethoxyethane, tetrahydrofuran and the like can be used alone or in combination of two or more.

The electrolyte concentration in the electrolyte is about 0.1 to
It is preferably 2.5 mol / 1.

[0026]

Embodiments of the present invention will be described below. The charge and discharge characteristics of the battery of the present invention were examined using a small-scale experimental cell as shown in FIG.

First, a sheet-like electrode was produced as follows. Formation of Positive Electrode Active Material Layer LiMn 2 O 4 was prepared as a positive electrode active material, flaky graphite as a filler, and fluororubber as a binder.

These were mixed with a mixed solvent of ethyl acetate and nityl cellosolve (by volume ratio, ethyl acetate) so that LiMn 2 O 4 : flaky graphite: fluororubber = 100: 6: 1.96 (weight ratio). : Nityl cellosolve =
1: 3) and mixed to form a paste.

This paste was applied on an aluminum foil (current collector foil) 1a having a thickness of 15 μm, dried and pressed to form a positive electrode active material layer 1b having a thickness of 112 μm. Formation of free acid adsorption layer Insulating substance: α-Al 2 O 3 powder having an average particle diameter of 1.0 μm Binder: polyvinylidene fluoride (PVDF) powder [KF # 1100 manufactured by Kureha Chemical Industry Co., Ltd.] Solvent: 1-methyl-21-pyrrolidone (NMP) α-Al 2 O 3 and P so that the weight ratio becomes 100: 5.
VDF and VDF were mixed in a powder state, and NMP was added thereto and further mixed to obtain a slurry having a solid content of 56.8% by weight.

This slurry is uniformly applied to a thickness of 10 μm on the positive electrode active material layer using a doctor blade,
This was dried in an oven at 120 ° C. for 15 minutes. Thus, the free acid adsorption layer 1c was fixed on the positive electrode active material layer 1b.

The porosity of the free acid adsorption layer is 52%.
Met. The porosity was measured by a mercury borosimeter manufactured by Shimadzu Corporation using the free acid adsorption layer formed alone. Formation of Negative Electrode Active Material Layer Mesophase pitch carbon fiber graphite and flaky graphite were prepared as negative electrode active materials. Carboxymethyl cellulose was prepared as a dispersant, and latex was prepared as a binder.

These were prepared as follows: mesophase carbon fiber graphite: scaly graphite: carboxymethylcellulose: latex = 90: 10: 1.4:
It was added to purified water so that the weight ratio became 1.8 (weight ratio), and mixed to form a paste.

This paste was applied on a copper foil (collector foil) 2a having a thickness of 12 μm, dried and pressed to form a negative electrode active material layer 2b having a thickness of 81 μm. Thus, the positive electrode 1 having the positive electrode active material layer 1b formed on the current collector foil 1a and the free acid adsorption layer 1c formed thereon is formed.
And the negative electrode 2 in which the negative electrode active material layer 2b was formed on the current collector foil 2a was produced. In the positive electrode, the area of the negative electrode active material layer 2b was 1.55 cm × 1.05 cm such that the area of the positive electrode active material layer 1b was 1.50 cm × 1.00 cm.
cm.

Using the positive and negative sheet electrodes thus produced, the active material layers of the positive and negative electrodes 1 and 2 were opposed to each other.
A small-scale cell A shown in FIG. 1 was assembled with a separator 3 made of a microporous polyethylene film having a thickness of 25 μm interposed therebetween.

As a comparative example, as shown in FIG. 2, a small-scale cell B having the same configuration as that described above except that the free acid adsorption layer 1c was not provided was produced. These cells A and B were immersed in an electrolytic solution (25 ° C.) having the following composition, and a charge / discharge cycle test was performed under the following conditions. [Composition of Electrolyte Solution] Electrolyte: LiPF 6 Solvent: Ethylene carbonate (EC) and diethyl carbonate (DEC), EC: DEC = 1: 2 (volume ratio)
What was mixed in.

Electrolyte concentration: 1.0 mol / l [Charge / discharge conditions] Charge: Upper limit voltage: 4.2 V, current density: 3.0 mA / cm 2
And a constant current constant voltage charge for a total of 3 hours. Discharge: a current density of 3.0 mA / cm 2 and a final voltage of 2.7
Constant current discharge up to V. The discharge capacity (E1) at the first cycle and the discharge capacity (E50) at the 50th cycle were measured, and 50% was calculated from these values.
The capacity retention ratio (ER) due to cycle charge / discharge was calculated from the following equation (1).

ER (%) = (E50 / E1) × 100 (1) The results are shown in Table 1 below.

[0038]

[Table 1]

As can be seen from the results, since cell A has free acid adsorption layer 1c, hydrofluoric acid generated from LiPF 6 in the electrolyte during charge and discharge is adsorbed by free acid adsorption layer 1c, and Since the active material lithium manganese oxide is hardly dissolved, the cell B without the free acid adsorption layer 1c is used.
The capacity retention ratio due to repetition of charge and discharge is higher than that of. Further, it can be seen that the initial discharge capacity of the cell A is equivalent to that of the cell B, and the presence of the free acid adsorption layer 1c does not cause a decrease in the charge / discharge performance.

In the above embodiment, the free acid adsorption layer 1
c is α-AlTwoOThreeMade of powder, but adsorbs free acid
The insulating material forming the layer 1c is not limited to this, but may be MgO,
Al TwoOThree, CaO, or oxides such as BaO
Or other substances that can adsorb free acid
It may be quality.

In the above embodiment, the free acid adsorption layer 1
Since c is formed on the positive electrode active material layer 1b, there is an effect that the thickness of the free acid adsorption layer 1c can be reduced, but the free acid adsorption layer 1c does not necessarily need to be fixed to the positive electrode active material side. Instead, they may be formed independently and disposed between the positive electrode active material layer 1 b and the separator 3.

[0042]

As described above, according to the battery of the present invention, the provision of the free acid-adsorbing layer makes it difficult for the positive electrode active material to dissolve in the free acid, thereby increasing the capacity during charge / discharge and storage. Reduction is prevented. In addition, since the free acid adsorption layer is located between the positive electrode active material and the separator, it has no adverse effect on the charge / discharge performance.

In particular, according to the battery of the second aspect, the above-mentioned effect is enhanced by limiting the insulating material forming the free acid adsorption layer. In particular, according to the battery of claim 3, in addition to the above effects, there is an effect that the thickness of the free acid adsorption layer can be reduced.

In particular, in the battery according to the fourth aspect, since the capacity is greatly reduced by the free acid, a particularly great effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an experimental small-scale cell (cell corresponding to an example of the present invention) used in an embodiment.

FIG. 2 is a cross-sectional view showing an experimental small-scale cell (a cell corresponding to a comparative example) used in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode 1b Positive electrode active material layer 1c Free acid adsorption layer 2 Negative electrode 2b Negative electrode active material layer 3 Separator

Claims (4)

[Claims]
1. A battery provided with a laminate comprising a positive electrode, a negative electrode, and a separator interposed between both electrodes,
It has pores that can pass ions in the electrolytic solution, and can adsorb free acid generated from the electrolytic solution, and the free acid-adsorbing layer made of an insulating material separate from the separator has a positive electrode active material and A battery interposed between the battery and a separator.
2. The insulating substance forming the free acid adsorption layer is made of Mg.
2. An oxide selected from the group consisting of O, Al 2 O 3 , CaO, and BaO.
The battery as described.
3. The battery according to claim 1, wherein the free acid adsorption layer is fixed on the positive electrode active material side.
4. The positive electrode active material is a lithium manganese oxide, the negative electrode is capable of storing and releasing lithium in an ion state, and the electrolyte is an organic solvent containing at least a compound containing lithium and fluorine. The battery according to any one of claims 1 to 3, wherein the battery is dissolved in water.
JP9016925A 1997-01-30 1997-01-30 Battery Pending JPH10214640A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9016925A JPH10214640A (en) 1997-01-30 1997-01-30 Battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9016925A JPH10214640A (en) 1997-01-30 1997-01-30 Battery

Publications (1)

Publication Number Publication Date
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Family

ID=11929713

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Country Status (1)

Country Link
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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000013251A1 (en) * 1998-08-31 2000-03-09 Hitachi, Ltd. Lithium secondary cell and device
JP2005235508A (en) * 2004-02-18 2005-09-02 Matsushita Electric Ind Co Ltd Lithium-ion secondary battery and its manufacturing method
WO2005112150A1 (en) * 2004-05-14 2005-11-24 Matsushita Electric Industrial Co., Ltd. Lithium ion secondary battery and method for producing same
WO2005117167A1 (en) * 2004-05-25 2005-12-08 Matsushita Electric Industrial Co., Ltd. Lithium ion secondary battery and method for manufacturing same
WO2005124899A1 (en) * 2004-06-22 2005-12-29 Matsushita Electric Industrial Co., Ltd. Secondary battery and method for producing same
WO2008132792A1 (en) * 2007-04-12 2008-11-06 Panasonic Corporation Nonaqueous electrolyte secondary battery
JP2009054455A (en) * 2007-08-28 2009-03-12 Sony Corp Nonaqueous electrolyte secondary battery and manufacturing method of electrode
JP2010257893A (en) * 2009-04-28 2010-11-11 Nissan Motor Co Ltd Bipolar type electrode and bipolar type secondary battery using this
US7964309B2 (en) 2007-04-27 2011-06-21 Sanyo Electric Co., Ltd. Non-aqueous electrolyte secondary cell and method for producing same
EP2355216A1 (en) 2010-02-01 2011-08-10 Sony Corporation Nonaqueous electrolyte composition and nonaqueous electrolyte secondary battery
JP2011192395A (en) * 2010-03-11 2011-09-29 Sanyo Electric Co Ltd Nonaqueous electrolyte secondary battery
JP2012212707A (en) * 2011-03-30 2012-11-01 Daihatsu Motor Co Ltd Electrode, electrochemical cell, and method for manufacturing electrode
US8383273B2 (en) 2009-04-27 2013-02-26 Sony Corporation Nonaqueous electrolyte composition and nonaqueous electrolyte secondary battery
WO2014156116A1 (en) * 2013-03-28 2014-10-02 三洋電機株式会社 Positive electrode for nonaqueous-electrolyte secondary battery, method for manufacturing positive electrode for nonaqueous-electrolyte secondary battery, and nonaqueous-electrolyte secondary battery
KR20160065094A (en) 2013-10-02 2016-06-08 소니 주식회사 Battery, electrolyte, battery pack, electronic device, electric motor vehicle, electrical storage device, and power system
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Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000013251A1 (en) * 1998-08-31 2000-03-09 Hitachi, Ltd. Lithium secondary cell and device
JP2005235508A (en) * 2004-02-18 2005-09-02 Matsushita Electric Ind Co Ltd Lithium-ion secondary battery and its manufacturing method
CN100456532C (en) * 2004-05-14 2009-01-28 松下电器产业株式会社 Lithium-ion secondary battery and its manufacturing method
KR100853593B1 (en) 2004-05-14 2008-08-21 마쯔시다덴기산교 가부시키가이샤 Lithium ion secondary battery and method for producing same
WO2005112150A1 (en) * 2004-05-14 2005-11-24 Matsushita Electric Industrial Co., Ltd. Lithium ion secondary battery and method for producing same
US7875391B2 (en) 2004-05-25 2011-01-25 Panasonic Corporation Lithium ion secondary battery and method for manufacturing same
WO2005117167A1 (en) * 2004-05-25 2005-12-08 Matsushita Electric Industrial Co., Ltd. Lithium ion secondary battery and method for manufacturing same
US7560193B2 (en) 2004-06-22 2009-07-14 Panasonic Corporation Secondary battery and method for producing the same
JPWO2005124899A1 (en) * 2004-06-22 2008-04-17 松下電器産業株式会社 Secondary battery and manufacturing method thereof
US7402184B2 (en) 2004-06-22 2008-07-22 Matsushita Electric Industrial Co., Ltd. Secondary battery and method for producing the same
WO2005124899A1 (en) * 2004-06-22 2005-12-29 Matsushita Electric Industrial Co., Ltd. Secondary battery and method for producing same
JP4781263B2 (en) * 2004-06-22 2011-09-28 パナソニック株式会社 Secondary battery and manufacturing method thereof
US8221922B2 (en) 2007-04-12 2012-07-17 Panasonic Corporation Non-aqueous electrolyte secondary battery
WO2008132792A1 (en) * 2007-04-12 2008-11-06 Panasonic Corporation Nonaqueous electrolyte secondary battery
US7964309B2 (en) 2007-04-27 2011-06-21 Sanyo Electric Co., Ltd. Non-aqueous electrolyte secondary cell and method for producing same
JP2009054455A (en) * 2007-08-28 2009-03-12 Sony Corp Nonaqueous electrolyte secondary battery and manufacturing method of electrode
JP4661843B2 (en) * 2007-08-28 2011-03-30 ソニー株式会社 Nonaqueous electrolyte secondary battery
US8927155B2 (en) 2007-08-28 2015-01-06 Sony Corporation Non-aqueous electrolyte secondary battery and producing method of electrode
US8383273B2 (en) 2009-04-27 2013-02-26 Sony Corporation Nonaqueous electrolyte composition and nonaqueous electrolyte secondary battery
US8647779B2 (en) 2009-04-27 2014-02-11 Sony Corporation Nonaqueous electrolyte composition and nonaqueous electrolyte secondary battery
JP2010257893A (en) * 2009-04-28 2010-11-11 Nissan Motor Co Ltd Bipolar type electrode and bipolar type secondary battery using this
US9806374B2 (en) 2010-02-01 2017-10-31 Sony Corporation Battery
US9595717B2 (en) 2010-02-01 2017-03-14 Sony Corporation Nonaqueous electrolyte composition and nonaqueous electrolyte secondary battery
EP2355216A1 (en) 2010-02-01 2011-08-10 Sony Corporation Nonaqueous electrolyte composition and nonaqueous electrolyte secondary battery
JP2011192395A (en) * 2010-03-11 2011-09-29 Sanyo Electric Co Ltd Nonaqueous electrolyte secondary battery
JP2012212707A (en) * 2011-03-30 2012-11-01 Daihatsu Motor Co Ltd Electrode, electrochemical cell, and method for manufacturing electrode
JPWO2014156116A1 (en) * 2013-03-28 2017-02-16 三洋電機株式会社 Non-aqueous electrolyte secondary battery positive electrode, non-aqueous electrolyte secondary battery manufacturing method and non-aqueous electrolyte secondary battery
WO2014156116A1 (en) * 2013-03-28 2014-10-02 三洋電機株式会社 Positive electrode for nonaqueous-electrolyte secondary battery, method for manufacturing positive electrode for nonaqueous-electrolyte secondary battery, and nonaqueous-electrolyte secondary battery
KR20160065094A (en) 2013-10-02 2016-06-08 소니 주식회사 Battery, electrolyte, battery pack, electronic device, electric motor vehicle, electrical storage device, and power system
US9954212B2 (en) 2013-10-02 2018-04-24 Murata Manufacturing Co., Ltd. Battery, electrolyte, battery pack, electronic device, electric motor vehicle, electrical storage device, and power system
CN105917514A (en) * 2014-01-14 2016-08-31 昭和电工株式会社 Lithium secondary battery and conductive assistant used in same
EP3096387A4 (en) * 2014-01-14 2017-07-19 Showa Denko K.K. Lithium secondary battery and conductive assistant used in same
US10084190B2 (en) 2014-01-14 2018-09-25 Showa Denko K.K. Lithium secondary battery and conductive assistant used in same

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