Abstract: A lithium ion battery control system includes a degradation rate calculating unit, a degradation rate storage unit, a degradation rate comparing unit, a charging and discharging control circuit, and a rechargeable battery. The degradation rate calculating unit calculates a degradation rate when receiving a trigger for starting the check of the degradation rate of the battery. The degradation rate comparing unit receives a present degradation rate from the degradation rate calculating unit and a previous degradation rate from the degradation rate storage unit and compares both degradation rates. As a result, when the present degradation rate is greater than the previous degradation rate by a predetermined value, a charging and discharging condition is limited.

Abstract: Provided is a negative electrode material for a lithium ion secondary battery, which has excellent high-temperature storage characteristics and cycle characteristics. The negative electrode material for a lithium ion secondary battery has a high molecular weight polymer adsorbed on a carbon material, the O/C value of surface functional group quantity is 4.5% or more and 25% or less in the negative electrode material for a lithium ion secondary battery, and the S/C value of surface functional group quantity is 0.05% or more and 2.5% or less in the negative electrode material for a lithium ion secondary battery. Also provided are a negative electrode for a lithium ion secondary battery, lithium ion secondary battery, and methods for producing the negative electrode material, the negative electrode, and the battery.

Abstract: Conventionally, there is a problem that a volume of a negative electrode active material changes during a charge-discharge cycle, a conductive network in a negative electrode gradually degrades, and thus a capacity of the negative electrode decreases. To solve the problem, the present invention has an object to prevent a reduction in capacity of the negative electrode, and increase life of a lithium ion secondary battery. A negative electrode active material for lithium ion secondary battery includes: a graphite core material; and a covering layer that covers a surface of the core material, wherein the covering layer has a thickness of 1 nm to 200 nm, and has a bulk modulus lower than a bulk modulus of the core material.

Abstract: An object of the present invention is to provide a lithium ion battery which is excellent in properties at large current and can be applied to applications requiring high output power even when the mixture layers are made thick. The present invention provides a lithium ion battery including a positive electrode including a positive electrode mixture layer formed on a current collector, a negative electrode including a negative electrode mixture layer formed on a current collector and an electrolyte, the positive electrode and the negative electrode being disposed through the intermediary of a separator, wherein the positive electrode includes as a positive electrode active material a lithium composite oxide represented by LiNiaMnbCOcMdO2 (in the formula, M is at least one selected from the group consisting of Fe, V, Ti, Cu, Al, Sn, Zn, Mg, B and W, a+b+c+d=1, 0.2?a?0.8, 0.1?b?0.4, 0?c?0.4 and 0?d?0.

Abstract: A conductive lead 21 or 22 welded to a positive electrode 11 or a negative electrode 12 protrudes from the upper surface side and the lower surface side of an electrode group 10. The conductive leads 21 and 22 have spiral shape portions 21b and 22b and end portions 21c and 22c for welding, respectively. The end portion 21c for welding of the conductive lead 21 is welded to a lid unit 5, and the end portion 22c for welding of the conductive lead 22 is welded to a can bottom 203 of a battery can 2. The end portion 22c for welding of the conductive lead 22 is positioned corresponding to a hollow portion 15a of an axial core 15.

Abstract: A method of simultaneously preventing expansion of a battery can and distortion of an electrode winding body is disclosed. A non-aqueous electrolyte wound type secondary battery includes an electrode winding body including a positive electrode sheet, a negative electrode sheet and a separator between the positive electrode sheet and the negative electrode sheet, a support member which is inside the electrode winding body and around which the electrode winding body is wound, and a battery can which contains the electrode winding body and the support member. The positive electrode sheet includes a positive electrode layer and a positive electrode lead part. The negative electrode sheet includes a negative electrode layer and a negative electrode lead part. An inside of a corner of the electrode winding body is supported by the support member. A gap is provided inside the lead part of the electrode winding body and inside the support member.

Abstract: In a charging control system for recording data regarding charging a secondary battery, a status recording unit refers the charging voltage value and the charging current value and records the referred charging voltage, the referred charging current and reference time when the charging current value is referred and time when the charging voltage value is referred, on the recording unit. A battery protecting unit stops the charging the secondary battery when the charging voltage exceeds the predetermined target voltage value. The status recording unit starts recording of the charging voltage value, the charging current value, and the reference time on the recording unit, when the charging voltage exceeds the target voltage value as a result of a fail in stopping the charging by the battery protecting unit because of occurrence of a trouble in the battery protecting unit.

Abstract: A lithium-ion secondary battery system is provided which can improve the cycle life and the storage property of a lithium-ion secondary battery and can decrease a discharge capacity which cannot be recharged. The lithium-ion secondary battery system includes a lithium-ion secondary battery having a cathode, an anode including carbon, and a non-aqueous electrolyte; a charge/discharge circuit for putting the lithium-ion secondary battery on charge according to a charge control parameter; and an arithmetic processing section for controlling the charge/discharge circuit.

Abstract: A lithium ion battery control system includes a degradation rate calculating unit, a degradation rate storage unit, a degradation rate comparing unit, a charging and discharging control circuit, and a rechargeable battery. The degradation rate calculating unit calculates a degradation rate when receiving a trigger for starting the check of the degradation rate of the battery. The degradation rate comparing unit receives a present degradation rate from the degradation rate calculating unit and a previous degradation rate from the degradation rate storage unit and compares both degradation rates. As a result, when the present degradation rate is greater than the previous degradation rate by a predetermined value, a charging and discharging condition is limited.

Abstract: Provided is a lithium ion secondary battery including a cathode that is capable of occluding and emitting lithium ions, and an anode that is capable of occluding and emitting the lithium ions. A polymer compound containing a polyether portion and a carboxylic acid bonding portion is bonded to an active material as shown with a structure I, a structure II, a structure III, and a structure IV.

Abstract: The present invention is to provide a lithium ion secondary battery that realizes to raise an initial charge and discharge efficiency without deteriorating its charge and discharge characteristic in comparison with the conventional technology. A carbon material and a lithium ion secondary battery using the carbon material as the anode material, wherein the face interval d002 of the carbon material determined by an X ray diffraction apparatus is not less than 0.340 nm and not more than 0.370 nm, and further, V1/V2 representing a ratio of a volume V1 of pores having diameters from not less than 1 nm to less than 10 nm in the carbon material with respect to a volume V2 of pores having diameters from not less than 10 nm to less than 100 nm therein is not more than 0.2.

Abstract: In a charging control system for recording data regarding charging a secondary battery, a status recording unit refers the charging voltage value and the charging current value and records the referred charging voltage, the referred charging current and reference time when the charging current value is referred and time when the charging voltage value is referred, on the recording unit. A battery protecting unit stops the charging the secondary battery when the charging voltage exceeds the predetermined target voltage value. The status recording unit starts recording of the charging voltage value, the charging current value, and the reference time on the recording unit, when the charging voltage exceeds the target voltage value as a result of a fail in stopping the charging by the battery protecting unit because of occurrence of a trouble in the battery protecting unit.

Abstract: An object of the present invention is to provide a lithium ion battery which is excellent in properties at large current and can be applied to applications requiring high output power even when the mixture layers are made thick. The present invention provides a lithium ion battery including a positive electrode including a positive electrode mixture layer formed on a current collector, a negative electrode including a negative electrode mixture layer formed on a current collector and an electrolyte, the positive electrode and the negative electrode being disposed through the intermediary of a separator, wherein the positive electrode includes as a positive electrode active material a lithium composite oxide represented by LiNiaMnbCOcMdO2 (in the formula, M is at least one selected from the group consisting of Fe, V, Ti, Cu, Al, Sn, Zn, Mg, B and W, a+b+c+d=1, 0.2?a?0.8, 0.1?b?0.4, 0?c?0.4 and 0?d?0.

Abstract: A lithium-ion secondary battery system is provided which can improve the cycle life and the storage property of a lithium-ion secondary battery and can decrease a discharge capacity which cannot be recharged. The lithium-ion secondary battery system includes a lithium-ion secondary battery having a cathode, an anode including carbon, and a non-aqueous electrolyte; a charge/discharge circuit for putting the lithium-ion secondary battery on charge according to a charge control parameter; and an arithmetic processing section for controlling the charge/discharge circuit.

Abstract: A lithium ion secondary battery includes: a cathode that stores/releases lithium ion at a potential not lower than an oxidation-reduction equilibrium potential between halogen ion and halogen; an anode that stores/releases lithium ion, preferably containing carbon; and a non-aqueous electrolytic solution composed of a non-aqueous solvent having dissolved therein an electrolyte. The non-aqueous electrolytic solution contains lithium halide or a halogen molecule. Instead of the non-aqueous electrolytic solution, a polymer solid electrolyte containing lithium halide or halogen molecule may be used.

Abstract: The present invention is to provide a lithium ion secondary battery that realizes to raise an initial charge and discharge efficiency without deteriorating its charge and discharge characteristic in comparison with the conventional technology. A carbon material and a lithium ion secondary battery using the carbon material as the anode material, wherein the face interval d002 of the carbon material determined by an X ray diffraction apparatus is not less than 0.340 nm and not more than 0.370 nm, and further, V1/V2 representing a ratio of a volume V1 of pores having diameters from not less than 1 nm to less than 10 nm in the carbon material with respect to a volume V2 of pores having diameters from not less than 10 nm to less than 100 nm therein is not more than 0.2.

Abstract: A lithium secondary battery having high power characteristics and excellent life characteristics in which the anode comprises at least carbon as an anode active material, and an SBR latex and a cellulosic viscosity improver as a binder material, the carbon material has an inter layer distance (d002) of from 0.345 to 0.37 nm and an intrinsic viscosity (?) of from 1.7 to 2.1 g/cc, and the weight ratio (R) of the cathode active material and the anode active material per unit area is within a range from 1.3 to 1.7.