JP5838042B2 - Lithium ion battery separator and lithium ion battery using the same - Google Patents

Lithium ion battery separator and lithium ion battery using the same Download PDF

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JP5838042B2
JP5838042B2 JP2011110007A JP2011110007A JP5838042B2 JP 5838042 B2 JP5838042 B2 JP 5838042B2 JP 2011110007 A JP2011110007 A JP 2011110007A JP 2011110007 A JP2011110007 A JP 2011110007A JP 5838042 B2 JP5838042 B2 JP 5838042B2
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separator
lithium ion
semiconductive layer
ion battery
positive electrode
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JP2012243434A (en
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野家 明彦
明彦 野家
正則 吉川
正則 吉川
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株式会社日立製作所
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    • 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

Description

  The present invention relates to a lithium ion battery including a positive electrode, a negative electrode, a separator for electrical insulation of both electrodes, and a water-insoluble electrolyte in a battery container, and a separator used for a lithium ion battery.

  Lithium ion batteries are widely used as secondary batteries because of their high capacity, high energy density, and excellent life characteristics and charge / discharge cycle characteristics. However, since the energy density is high, it is necessary to take sufficient measures to ensure safety compared to other secondary batteries.

  For this reason, the charging voltage of the lithium ion battery is set to a predetermined value using a voltage control circuit in order to prevent the positive electrode material and the negative electrode material from becoming chemically unstable and generating heat due to excessive charging. Is not exceeded.

  In addition, for example, a polyolefin microporous film is used for the separator inserted between the positive electrode and the negative electrode of the lithium ion battery, but the melting point is about 160 ° C., and heat shrinkage is likely to occur due to excessive heat generation. Measures have been taken to improve heat resistance by adding inorganic substances.

  However, when the lithium ion battery is charged, if the charging voltage is not controlled due to the malfunction of the voltage control circuit and the overcharging is performed, the excess of the electrical energy stored in the battery exceeds the tolerance of the above heat-resistant separator. Heat generation occurs, the separator melts, a short circuit occurs between the positive electrode and the negative electrode, the battery temperature rises rapidly, and ignition occurs.

  In order to prevent the ignition of the battery at the time of overcharging of such a lithium ion battery, in Patent Document 1, a non-woven fabric of glass fiber, alumina fiber or ceramic fiber is installed inside the battery together with the separator.

JP 2004-127545 A

  When a lithium-ion battery is overcharged, the heat-resistant separator melts and the positive and negative electrodes of the battery are in direct contact and short-circuited, so that the electrical energy excessively stored in the battery is released instantly and sudden Joule heating occurs. Occurs and the battery temperature rises rapidly.

  In order to prevent such a rapid increase in temperature during overcharging of the battery and ensure safety, Patent Document 1 has a glass fiber, alumina fiber, or ceramic fiber non-woven fabric installed together with a separator inside the battery. Since the glass fiber, alumina fiber, and ceramic fiber all have a higher heat resistance temperature than the separator, even when the separator melts due to the heat generated during overcharging, all remain between the positive electrode and the negative electrode while maintaining the shape of the nonwoven fabric. As a result, the positive electrode and the negative electrode are not in direct contact and short-circuited, and it is possible to prevent sudden Joule heat generation and hence a rapid increase in battery temperature.

  However, glass fiber, alumina fiber, and ceramic fiber, which are non-woven materials, are all insulators, and almost no current flows between the positive electrode and the negative electrode, so that electric energy stored in the battery cannot be released by overcharging. This necessitates a new device and operation for safely discharging the energy of the battery, resulting in a problem that the battery cost including the processing operation cost is increased.

  Moreover, the treatment of the overcharged battery is not preferable from the viewpoint of safety.

  An object of the present invention is to prevent a sudden rise in battery temperature during overcharging of a lithium ion battery and to safely release the electrical energy stored by overcharging.

The following means are used to suppress a rapid rise in battery temperature during the overcharge of the lithium ion battery and to safely release the electrical energy stored by the overcharge.
(1) A lithium ion battery comprising a positive electrode and a negative electrode provided in a battery container, a separator for maintaining electrical insulation between the positive electrode and the negative electrode, and an electrolytic solution, and a half-between the negative electrode and the positive electrode conductive layer is provided, semiconducting layer comprises an insulator, semiconducting layer the lithium ion battery comprising a semiconductor or conductor.
(2) The semiconductive layer is a lithium ion battery formed on the positive electrode side surface of the separator.
(3) A lithium ion battery having a porosity of the semiconductive layer of 20% or more and less than 50%.
(4) A lithium ion battery in which the thickness of the semiconductive layer is 10 to 30 μm.
(5) The shape of the insulator is a nonwoven fabric or a mesh, and the semiconductor or the conductor is a lithium ion battery attached to the insulator.
(6) A lithium ion battery in which the insulator is made of resin, and a semiconductor or a conductor is mixed in the insulator.
(7) A lithium ion battery in which the melting temperature of the insulator and the semiconductor or conductor is higher than the melting temperature of the separator.
(8) A lithium ion battery having an electric resistivity of 10 3 Ωm to 10 7 Ωm of the semiconductive layer.
(9) A lithium ion battery in which the insulator is at least one of alumina, silicon nitride, aluminum nitride, and glass.
(10) when the semiconductor is included in semi-conductive layer, the semiconductor is a Si or SnO any one or more, if they contain conductors semiconductive layer, conductor, Cu, Ni, Mn or A lithium ion battery that is one or more of Mg.
(11) and the separator for maintaining the electrical insulation of the positive electrode and the negative electrode, a separator for a lithium ion battery having a semiconductive layer provided on the surface of the separator, semiconducting layer comprises an insulator , semiconductive layer is a separator for a lithium-ion battery comprising a semiconductor or conductor.

  Since a separator exists between the positive electrode and the semiconductive material and the negative electrode, electrical insulation is maintained, and the lithium ion battery can be normally charged and discharged as before the semiconductive material is additionally provided. Moreover, the electrical energy stored at the time of overcharge can be safely discharged | emitted by a semiconductive material. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

The block diagram of the lithium ion battery which shows the Example of this invention. The block diagram of the separator which shows the Example of this invention. The block diagram of the separator which shows another Example. The block diagram of the separator which shows another Example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description shows specific examples of the contents of the present invention, and the present invention is not limited to these descriptions. Various modifications by those skilled in the art are within the scope of the technical idea disclosed in this specification. Changes and modifications are possible. In all the drawings for explaining the present invention, components having the same function are denoted by the same reference numerals, and repeated description thereof may be omitted.

  In order to prevent a sudden rise in battery temperature during overcharging of a lithium ion battery, when the separator melts due to the heat generated by overcharging, the rapid joule heating that occurs when the positive and negative electrodes are directly contacted and short-circuited is prevented. It is necessary.

  Further, the overcharged battery stores electrical energy, and it is not preferable for safety to keep it as it is.

  Therefore, by applying a semiconductive material to the positive electrode side or negative electrode side surface of the lithium ion battery separator, the semiconductive material remains between the positive electrode and the negative electrode even when the separator melts due to overheating. In addition to preventing direct contact between the two electrodes, a constant current according to the predetermined resistance value of the semiconductive material flows, preventing a sudden rise in battery temperature due to sudden Joule heat generation and being stored in the battery by overcharging. It is possible to safely release the electrical energy. In consideration of the heat generation of the electrode, it is desirable to provide a semiconductive material on the positive electrode side surface of the separator of the lithium ion battery.

  By applying the semiconductive material to the positive electrode side surface of the separator, it becomes easy to form the semiconductive material, and the winding operation of the battery is not complicated, and the same productivity as the conventional one can be obtained.

  1 and 2 show an embodiment of the present invention. FIG. 1 shows a lithium ion battery to which this embodiment is applied. The lithium ion battery is wound in a state in which the positive electrode 5 and the negative electrode 2 and the separator 4 for electrically insulating the positive electrode 5 and the negative electrode 2 are sandwiched between the two electrodes and placed in the battery container 3, and then is water-insoluble or water-soluble. The electrolyte is injected and sealed. The positive electrode 5 is electrically connected to the positive electrode terminal 1, and the negative electrode 2 is electrically connected to the negative electrode terminal 6, and the battery is charged and discharged via the positive electrode terminal 1 and the negative electrode terminal 6. In applying the present invention, a rectangular shape may be used in addition to the cylindrical shape as shown in FIG.

  The positive electrode 5 can be produced by applying a paste kneaded with a positive electrode active material, a conductive agent, a binder, and an organic solvent to a current collector.

  As the positive electrode active material, a material capable of adsorbing and releasing lithium ions can be used, and examples thereof include Ni-based, Co-based, and Mn-based active materials.

  As the conductive agent for the positive electrode 5, a carbon-based material such as acetylene black or ketjen black is used.

  For example, polyvinylidene fluoride can be used as the binder of the positive electrode 5.

  N-methyl-2-pyrrolidone can be used as the organic solvent of the positive electrode 5.

  As the current collector for the positive electrode 5, an aluminum foil that is a conductive metal can be used.

  The separator 4 is made of a microporous film that maintains electrical insulation between the positive electrode 5 and the negative electrode 2 and can move lithium ions between the positive electrode 5 and the negative electrode 2. As the material of the separator 4, polyethylene, polypropylene, or the like is used in consideration of resistance to a solvent contained in the electrolytic solution and resistance to oxidation or reduction due to charging / discharging of the battery. For the separator 4, it is preferable to select a material having a shutdown function that closes the hole and suppresses the movement of lithium ions when the battery temperature rises due to heat generation.

  The negative electrode 2 can be prepared by applying a paste kneaded with a negative electrode active material, a conductive agent, a binder, and an organic solvent to a current collector.

  As the negative electrode active material, for example, graphite, carbon fiber, or the like can be used as a material capable of inserting and removing lithium ions.

  The same material as that of the positive electrode 5 can be used for the conductive agent, the binder, and the organic solvent of the negative electrode 2.

  For the current collector of the negative electrode 2, for example, a copper foil can be used as a conductive material.

  As the non-aqueous solvent (organic solvent) used in the non-aqueous electrolyte, a high dielectric constant is preferable, and esters containing carbonates are more preferable. Among them, it is recommended to use an ester having a dielectric constant of 30 or more. Examples of such high dielectric constant esters include ethylene carbonate, propylene carbonate, butylene carbonate, γ-butyrolactone, and sulfur-based esters (such as ethylene glycol sulfite). Among these, cyclic esters are preferable, and cyclic carbonates such as ethylene carbonate, vinylene carbonate, propylene carbonate, and butylene carbonate are particularly preferable. In addition to the above-mentioned various solvents, low-viscosity polar chain carbonates represented by dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, and the like, and aliphatic branched carbonate compounds can be used. A mixed solvent of a cyclic carbonate (particularly ethylene carbonate) and a chain carbonate is particularly preferred.

An electrolyte salt may be added to a non-aqueous solvent as a non-aqueous electrolyte. As the electrolyte salt used in the nonaqueous electrolytic solution, lithium salts such as lithium perchlorate, organic boron lithium salt, lithium salt of fluorine-containing compound, and lithium imide salt can be preferably used. Specific examples of the electrolyte salt, for example, LiClO 4, LiPF 6, LiBF 4, LiAsF 6, LiSbF 6, LiCF 3 SO 3, LiCF 3 CO 2, Li 2 C 2 F 4 (SO 3) 2, LiN (CF 3 SO 2 ) 2 , LiN (C 2 F 5 SO 2 ) 2 , LiC (CF 3 SO 2 ) 3 , LiCNF 2 N + 1SO 3 (N ≧ 2), LiN (RfOSO 2 ) 2 [where Rf Is a fluoroalkyl group], and among these lithium salts, fluorine-containing organic lithium salts can be suitably used.

  A cross-sectional view of the separator 4 used in this example is shown in FIG.

The semiconductive layer 10 was formed on the positive electrode side surface of the separator 4 by applying a semiconductive material prepared by mixing alumina fine particles of the insulator 7 and semiconductor silicon fine particles as the auxiliary body 8 into a paste. The average particle diameter of both the alumina fine particles and the silicon fine particles was 2 μm. Even if the average particle diameter of the alumina fine particles is different from the average particle diameter of the silicon fine particles, they may be the same as in this embodiment. The weight ratio of both was 50 wt% with respect to the total weight of the alumina fine particles and silicon fine particles. The thickness of the semiconductive layer was 20 μm and the porosity was 20%. The porosity was calculated from the size and weight of the semiconductive layer 10. The resistance value of the semiconductive layer 10 measured with a resistivity meter was 392Ω (10 6 Ωm). The semiconductive layer 10 may contain substances other than alumina fine particles and silicon fine particles, or may be composed of only alumina fine particles and silicon fine particles.

  By forming the semiconductive layer 10 as described above, a semiconductive function can be imparted to the separator 4, and it is not necessary to wind a semiconductive material separately from the separator 4 when the battery is assembled. The same productivity can be obtained.

  In order to confirm the effect of the present invention during overcharge, an overcharge test of the lithium ion battery of FIG. 1 was performed. The positive electrode terminal 1 and the negative electrode terminal 6 of the battery were connected to a charge / discharge device. Moreover, in order to evaluate the temperature characteristic of a battery, the thermocouple was attached to the battery surface. The battery was continuously charged in a constant current mode at a rate of 1 C, and changes with time in battery voltage and battery temperature were confirmed. For safety of the test, the upper limit value of the charging voltage was 20V. The voltage gradually increased after the charging rate (SOC) exceeded 100%, and then the charging was stopped in a state where the battery voltage rapidly increased to 20V. The battery temperature also started to rise when the SOC exceeded 100%, but even when the battery voltage reached 20 V, it was about 100 ° C., and no sudden temperature rise was observed. A current corresponding to the resistance value of the semiconductive layer 10 flowed between the positive electrode 5 and the negative electrode 2. The initial value of the current was 51 mA, and then gradually decreased due to the release of electrical energy. The time from when all the electric energy stored in the battery was released until the battery voltage became zero was 431 s.

As the insulator 7 constituting the semiconductive layer 10 applied to the separator 4 in FIG. 2, any one or more of silicon nitride fine particles, aluminum nitride fine particles, glass and the like can be used in addition to the alumina fine particles. The melting point of these fine particles is higher than 200 ° C., which is the melting temperature of the separator 4, and remains between the positive electrode 5 and the negative electrode 2 at the time of overcharging. That is, even when the separator 4 is melted due to heat generated by overcharging, the insulator 7 is not melted and remains between the positive electrode 5 and the negative electrode 2 to prevent a short circuit due to direct contact between both electrodes, and due to rapid Joule heat generation. Rapid increase in battery temperature can be suppressed. The resistivity of the insulator referred to in the present invention is approximately 10 8 Ωm or more.

  As the auxiliary body 8 constituting the semiconductive layer 10, any one or more of tin oxide in addition to silicon can be used for a semiconductor, and copper, nickel, manganese, molybdenum, magnesium, or the like can be used for a conductor. The melting point of these materials is higher than 200 ° C., which is the melting temperature of the separator 4, and even when the separator 4 is melted during overcharging, the auxiliary body 8 is not melted and a predetermined electric resistance can be maintained. The electrical energy stored by overcharging can be safely released.

In particular, copper, nickel, manganese, molybdenum, and magnesium, which are conductors, have a low resistivity (10 2 Ωm or less), and the semiconductive layer 10 having a predetermined resistivity can be obtained simply by mixing a small amount with an insulator. In addition, since these materials are relatively inexpensive, an increase in cost necessary for obtaining the semiconductive layer 10 can be suppressed. The resistivity of the semiconductor referred to in the present invention is approximately 10 3 Ωm to 10 7 Ωm. The resistivity of the conductor referred to in the present invention is about 10 2 Ωm or less.

By the semiconductive material with a mixture of insulator and semiconductor or conductor, the range of the electrical resistivity of the semiconductive material 10 3 Ωm~10 7 Ωm, preferably a 10 5 Ωm~10 7 Ωm, separator 4 The value of the current flowing in the semiconductive material remaining after melting can be arbitrarily selected, and the Joule heat generation and the discharge time of electric energy due to energization between the positive and negative electrodes can be adjusted to appropriate values.

  If the porosity of the semiconductive layer 10 applied to the separator 4 is too small, the movement of lithium ions is hindered and the charging / discharging of the battery is hindered. If the porosity of the semiconductive layer 10 is too high, the positive electrode 5 and the negative electrode 2 may be in direct contact with each other. As a result, the air permeability necessary for charging / discharging the battery can be secured, and a short circuit between the positive electrode 5 and the negative electrode 2 when the separator is melted during overcharging can be prevented, and a rapid increase in battery temperature can be suppressed.

  In addition, the thickness of the semiconductive layer 10 formed on the positive electrode side surface of the separator 4 is preferably 10 μm or more because the contact preventing effect between the positive electrode 5 and the negative electrode 2 becomes insufficient if it is too thin. Thereby, the distance required for the short circuit prevention of the positive electrode 5 and the negative electrode 2 is securable. The thickness of the semiconductive layer 10 formed on the positive electrode side surface of the separator 4 is preferably 30 μm or less because it is difficult to wind the battery if it is too thick. Thereby, workability | operativity at the time of winding of a battery can be improved.

  From the result of Example 1, by applying a mixture of the insulator 7 and the auxiliary body 8 to the positive electrode side surface of the separator 4 of the lithium ion battery to form the semiconductive layer 10, the positive electrode 5 at the time of overcharging of the battery is obtained. It has been confirmed that the battery temperature can be prevented from abruptly rising due to a short circuit between the negative electrode 2 and the negative electrode 2 and that the electrical energy stored in the battery can be safely discharged by overcharging.

  By using an insulator and a semiconductor, or an insulator and a conductor as materials constituting the semiconductive layer 10 as in this embodiment, the separator 4 remains between the positive electrode 5 and the negative electrode 2 when melted. The electrical resistivity of the semiconductive material can be adjusted to an arbitrary value, and the value of the current flowing between the positive and negative electrodes can be freely selected in order to safely release the electrical energy stored in the battery by overcharging. Thereby, it is possible to prevent the Joule heat generated when the electric energy is released from becoming excessive, and to set an appropriate release time.

[Comparative Example 1]
A lithium ion battery was produced in the same manner as in Example 1 except that only the alumina fine particles were used for the semiconductive layer 10 and no silicon fine particles were used. The resistivity of the alumina fine particles was about 10 9 Ωm. In Comparative Example 1, not all of the electrical energy stored in the battery was released.

FIG. 3 shows another embodiment. In FIG. 3, a semiconductive layer 10 is provided separately from the separator 4 between the separator 4 and the positive electrode 5 of the lithium ion battery. The semiconductive layer 10 was composed of an insulator 7 and an auxiliary body 8. The insulator 7 was an alumina fiber nonwoven fabric, and nanometer-sized tin oxide was adhered to the surface of the fiber to form a semiconductive layer 10 having a thickness of 20 μm. The adhesion amount of tin oxide was 20 to 30 wt% with respect to the semiconductive layer 10. The resistance value of the semiconductive layer 10 was 39Ω (10 5 Ωm). The time change of the battery temperature at the time of charging to the battery voltage 20V was confirmed by the overcharge test. The battery temperature was about 100 to 150 ° C. even after charging was stopped at a battery voltage of 20 V, and it did not rise suddenly. The initial value of the current flowing through the positive electrode 5 and the negative electrode 2 was 510 mA, and thereafter decreased with time. The time until all the electric energy of the battery was released was 43 s. As the insulating material constituting the semiconductive layer 10 used in FIG. 3, a glass fiber mesh can be used in addition to the alumina fiber nonwoven fabric. By making the semiconductive material provided between the separator 4 and the positive electrode 5 a fiber layer or mesh different from the separator 4, it is possible to ensure the safety during overcharge more reliably. Moreover, all the materials used in Example 1 can be applied to the semiconductor and the conductor that are the materials of the auxiliary body 8.

  In Example 2, the semiconductive layer 10 provided between the separator 4 and the positive electrode 5 is formed as a molded body different from the separator 4, so that the semiconductive layer 10 is more between the positive electrode 5 and the negative electrode 2 during overcharge. Since it remains reliably, it is suitable for ensuring safety when overcharge conditions are severe, such as when the overcharge voltage becomes higher or when the high capacity battery is overcharged. In the present embodiment, the amount of heat generated per unit time can be suppressed, and the work time until the end of discharge can be shortened.

  From the results of Example 2, by providing the semiconductive layer 10 between the separator 4 and the positive electrode 5 separately from the separator 4, the battery temperature is prevented from rapidly rising during overcharging of the lithium ion battery, and safety is ensured. I confirmed that I can do it.

[Comparative Example 2]
A lithium ion battery similar to that of Example 1 was produced except that only the alumina fiber nonwoven fabric was used for the semiconductive layer 10 and tin oxide was not used. The resistivity of the alumina fiber nonwoven fabric was approximately 10 9 Ωm. In Comparative Example 2, not all of the electrical energy stored in the battery was released.

FIG. 4 shows a case where a conductive composite 9 is used as a semiconductive material separately from the separator 4 between the separator 4 and the positive electrode 5 of the lithium ion battery. The conductive composite 9 was formed by mixing tin oxide as a semiconductor with an insulating resin material. Polycarbonate was used as the resin material. The resistance value of the conductive composite 9 was 3920Ω (10 7 Ωm). When the time change of the battery temperature was confirmed by an overcharge test with an upper limit voltage of 20 V, the degree of temperature increase was more gradual than that of Example 1 and Example 2. The initial value of the current flowing between the positive electrode 5 and the negative electrode 2 after overcharging was 5 mA. The time until all the electric energy stored in the battery was released was 4300 s.

  When the conductive composite 9 is used as the semiconductive material, since the insulator is a resin and the melting point is lower than that of alumina or glass, the battery temperature is low such as in the case of a low overcharge voltage or a low capacity battery. Applicable to lower cases.

  The resin is preferably a thermoplastic resin that can be easily molded by heating. Specific examples include polyamide, polyethylene terephthalate, polybutylene terephthalate, methylpentene, polyamideimide, polytetrafluoroethylene, polyphenylene sulfide, polyether ether ketone, and the like.

  In addition, it is necessary to increase the resistance value of the semiconductive material to suppress the Joule heat generation per unit time and prevent the battery temperature from rising.

  From the results of Example 3, by providing a conductive composite 9 as a semiconductive material separately from the separator 4 and the positive electrode 5, the battery temperature is prevented from rising rapidly during overcharging of the lithium ion battery. , Confirmed that safety can be ensured.

DESCRIPTION OF SYMBOLS 1 Positive electrode terminal 2 Negative electrode 3 Battery container 4 Separator 5 Positive electrode 6 Negative electrode terminal 7 Insulator 8 Auxiliary body 9 Conductive composite 10 Semiconductive layer

Claims (11)

  1. A positive electrode and a negative electrode provided in the battery container;
    A separator disposed between the positive electrode and the negative electrode to maintain electrical insulation between the positive electrode and the negative electrode;
    A lithium ion battery comprising an electrolyte solution,
    A semiconductive layer is provided on at least one surface of the separator,
    The semiconductive layer has an electrical resistivity of 10 5 Ωm to 10 7 Ωm,
    The semiconductive layer includes an insulator;
    The semiconductive layer comprises a semiconductor or conductor;
    The semiconductor is at least one of Si and SnO,
    The conductor is at least one of Cu, Ni, Mn, Mo, Mg,
    The lithium ion battery, wherein the semiconductor or the conductor is attached to the insulator.
  2. A positive electrode and a negative electrode provided in the battery container;
    A separator disposed between the positive electrode and the negative electrode to maintain electrical insulation between the positive electrode and the negative electrode;
    A lithium ion battery comprising an electrolyte solution,
    A semiconductive layer is provided on at least one surface of the separator,
    The semiconductive layer has an electrical resistivity of 10 5 Ωm to 10 7 Ωm,
    The semiconductive layer includes an insulator;
    The semiconductive layer comprises a semiconductor or conductor;
    The semiconductor is at least one of Si and SnO,
    The conductor is at least one of Cu, Ni, Mn, Mo, Mg,
    The lithium ion battery, wherein the semiconductor or the conductor is mixed with the insulator.
  3. In claim 1 or 2,
    The semiconductive layer is a lithium ion battery formed on the positive electrode side surface of the separator.
  4. In claim 1 or 2,
    The lithium ion battery, wherein the semiconductive layer has a porosity of 20% or more and less than 50%.
  5. In claim 1 or 2,
    The thickness of the said semiconductive layer is a lithium ion battery which is 10-30 micrometers.
  6. In claim 1,
    The shape of the said insulator is a lithium ion battery which is a nonwoven fabric or a mesh.
  7. In claim 2,
    The insulator is a lithium ion battery made of resin.
  8. In claim 1 or 2,
    A lithium ion battery in which a melting temperature of the insulator and the semiconductor or the conductor is higher than a melting temperature of the separator.
  9. In claim 6,
    The insulator is a lithium ion battery that is at least one of alumina, silicon nitride, aluminum nitride, and glass.
  10. A separator for maintaining electrical insulation between the positive electrode and the negative electrode;
    A separator for a lithium ion battery having a semiconductive layer provided on a surface of the separator,
    The semiconductive layer has an electrical resistivity of 10 5 Ωm to 10 7 Ωm,
    The semiconductive layer includes an insulator;
    The semiconductive layer comprises a semiconductor or conductor;
    The semiconductor is at least one of Si and SnO;
    The conductor is at least one of Cu, Ni, Mn, Mo, Mg,
    The said semiconductor or the said conductor has adhered to the said insulator, The separator for lithium ion batteries characterized by the above-mentioned.
  11. A separator for maintaining electrical insulation between the positive electrode and the negative electrode;
    A separator for a lithium ion battery having a semiconductive layer provided on a surface of the separator,
    The semiconductive layer has an electrical resistivity of 10 5 Ωm to 10 7 Ωm,
    The semiconductive layer includes an insulator;
    The semiconductive layer comprises a semiconductor or conductor;
    The semiconductor is at least one of Si and SnO,
    The conductor is at least one of Cu, Ni, Mn, Mo, Mg,
    The lithium ion battery separator, wherein the semiconductor or the conductor is mixed with the insulator.
JP2011110007A 2011-05-17 2011-05-17 Lithium ion battery separator and lithium ion battery using the same Active JP5838042B2 (en)

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EP1965454B1 (en) * 2005-12-08 2019-12-25 Maxell Holdings, Ltd. Separator for electrochemical device and method for producing same, and electrochemical device and method for manufacturing same
JP5260838B2 (en) * 2005-08-30 2013-08-14 三洋電機株式会社 Non-aqueous secondary battery
KR100947181B1 (en) * 2007-11-19 2010-03-15 주식회사 엘지화학 A separator having porous coating layer and electrochemical device containing the same

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