568results about How to "Increase internal resistance" patented technology

A positive electrode material for a nonaqueous lithium secondary battery and a lithium secondary battery that has superior cycle life and safety and reduced internal resistance of the battery at low temperature is provided. The positive electrode material for a nonaqueous lithium secondary battery comprise a layered structured complex oxide expressed by a composition formula Li_aMn_xNi_yCo_zM_αO₂, where 0<a≦1.2, 0.1≦x≦0.9, 0≦y≦0.44, 0.1≦z≦0.6, 0.01≦α≦0.1, and x+y+z+α=1. A diffraction peak intensity ratio between the (003) plane and the (104) plane (I(003)/I(104)) in an X-ray powder diffractometry using a Cu—Kα line in the X-ray source is not less than 1.0 and not more than 1.5.

Apparatus and method for measuring current drain and reporting power consumption using current transformer with primary windings made of low ohmic alloy, enabling the use of the secondary coil to power the sensing and reporting circuits eliminating the power wasted by AC-DC power adaptors used for the current sensors. The saving is substantial as the current sensors will not drain a current when the AC outlets are disconnected from a load or when the load is switched off. The apparatus using low ohmic alloy is extended to the structuring of terminals, including power pins, power sockets and combinations to provide a low ohmic sensing elements in AC plugs, outlets, adaptors and extension cables with multi outlets, dissipating the heat from the sensing elements by the plugs and the larger metal heat dissipation.

The invention relates to the technical field of lithium ion batteries, in particular to a ternary cathode material lithium ion battery and an electrolyte thereof. The electrolyte comprises a non-water-based organic solvent, lithium salt and an additive. The additive comprises 1,3-propane sultone, a compound with the structural formula I or II, and a compound containing an M-O-Si functional group. M is any one of B, C, N, P, S and Al. Compared with the prior art, the ternary cathode material lithium ion battery with the electrolyte can normally work within the range of high voltage of 4.4 V or above, rise of internal resistance of the battery is restrained when the battery is used in high-pressure and low-temperature environments, the high-temperature storage performance and a low-temperature discharging platform of the battery are effectively improved, and excellent circulation performance and storage performance can be achieved within the wide temperature range.

A liquid low concentration sodium-containing silicate solution as electrolyte for lead-acid storage batteries and its applications, is prepared by mixing a silica gel containing 40˜60 wt % SiO₂, the weight units of such a silica gel are 5˜15; add 15-25 weight units water and stir until the concentration of the mixture is 0.65˜0.85 ⁰Be′ measured by a Baum densimeter, adjusting the pH value of this mixture to 1-4 using inorganic acid and magnetizing the mixture under 1000-6000 Gauss magnetic field for 5-10 minutes, stir the magnetized mixture until the viscosity of the mixture is less than 0.02 poise and finally obtain a liquid low concentration sodium-containing silicate solution. The electrolyte can be used as electrolyte or activation solution for common or special lead-acid storage batteries.

A nonaqueous electrolyte containing a silicon compound of formula (1) or (2) and a nonaqueous electrolyte secondary battery using the nonaqueous electrolyte and excellent in cycle characteristics and low temperature characteristics,

wherein R₁ and R₂ each represent alkyl, cycloalkyl, alkoxy or halogen; R₃ represents alkenyl; and X represents halogen,

wherein R₄, R₅, R₆, and R₇ each represent alkyl, alkoxy, alkenyl, alkenyloxy, alkynyl, alkynyloxy, phenyl or phenoxy, each of which may have an ether bond in its chain; R₈ represents halogen, halogen-substituted aryl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl; a trifluoromethyl group, an acyloxy group having 5 to 8 carbon atoms, a sulfonate group having 1 to 8 carbon atoms, an isocyanyl group an isothianyl or a cyano group, R₉ represents halogen, a trifluoromethyl group,an acyloxy group having 5 to 8 carbon atoms, a sulfonate group having 1 to 8 carbon atoms, an isocyanyl group an isothianyl or a cyano group: halogen-substituted aryl; n represents 1 or 2; and Y represents a single bond, oxygen, alkylene, alkylenedioxy, alkenylene, alkenylenedioxy, alkynylene, alkynylenedioxy, arylene or arylenedioxy; provided that the number of groups having an unsaturated bond in R₄, R₅, R₆, R₇, R₈, and R₉ is zero or one.

A nonaqueous electrolytic solution having an electrolyte salt dissolved in an organic solvent, which contains a silicon compound having an unsaturated bond which is represented by formula (I):

wherein R₁, R₂, R₃, R₄, R₅, and R₆ each represent an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group, an alkynyl group, an alkynyloxy group, an aryl group or an aryloxy group, each of which may have an ether bond in the chain thereof; n represents a number of from 0 to 5; when n is 1 to 5, X represents a single bond, an oxygen atom, an alkylene group, an alkylenedioxy group, an alkenylene group, an alkenylenedioxy group, an alkynylene group, an alkynylenedioxy group, an arylene group or an arylenedioxy group; provided that at least one of R₁, R₂, R₃, R₄, R₅, R₆, and X represents a group containing an unsaturated bond,

an organotin compound or an organogermanium compound and a nonaqueous secondary battery having the same.

The invention provides a positive pole piece which is characterized by comprising a positive pole current collector, a buffer conducting layer and a positive pole active layer in a sequential stacking mode. The buffer conducting layer comprises phosphate, a first conductive agent and a first binder. The phosphate has the following general formula: LiMPO4, wherein M is selected from one of Fe, Mn and Co or a composite of a plurality of Fe, Mn and Co. The thickness of the buffer layer is 2-50 millimeters, and the grain size of the first conductive agent is smaller than 75 millimeters. In the buffer conductive layer, the phosphate content is 40-90wt%, the first conductive agent content is 5-10wt%, and the first binder content is 5-50wt%. Meanwhile, the invention further discloses a preparation method of the positive pole piece and a battery adopting the positive pole piece. The battery prepared from the provided positive pole piece has good over-charging performance and the safety of the battery is greatly promoted.

Disclosed is a porous membrane for a secondary battery, which has further improved output characteristics and long-term cycle characteristics when compared with conventional porous membranes. The porous membrane for a secondary battery is used for a lithium ion secondary battery or the like. Specifically disclosed is a porous membrane for a secondary battery, which contains polymer particles A that have a number average particle diameter of 0.4 μm or more but less than 10 μm and a glass transition temperature of 65° C. or more and polymer particles B that have a number average particle diameter of 0.04 μm or more but less than 0.3 μm and a glass transition temperature of 15° C. or less. It is preferable that the polymer particles B have a crystallization degree of 40% or less and a main chain structure that is composed of a saturated structure.

The electric current collector of the present invention comprises a substrate composed of aluminum, a junction layer, formed on the surface of the substrate, in which aluminum and an electrically conductive material having electrical conductivity have been mixed, and an electrical conductor layer, formed on the junction layer, comprising the electrically conductive material. The electrode and the charge accumulating device of the present invention employ the electric current collector of the present invention.

A method and structure for protection against latch-up is provided. Integrated circuits manufactured in accordance with the present disclosure feature well and substrate contacts of varying periodicity. Such a strategy enables maximizing the design of an integrated circuit as to the suppression of latch-up while concurrently optimizing available area on the chip allocable to circuit design. This method and structure is particularly beneficial to protect against cable discharge events and other discharge occurrences prone to injecting large current densities into an integrated circuit.

Provided are a battery pack manufacturing method, which can prevent a drawback that some of used secondary batteries constituting a battery pack prematurely come to the end and which can suppress the enlargement of the temporary voltage difference between the used secondary battery at a charging/discharging time (especially in a low-temperature circumstance), and a battery pack. The battery pack manufacturing method comprises an acquiring step (Step S1) of acquiring the individual internal resistances of the secondary batteries already used, a selection step (Step S2) of selecting a plurality of the used secondary batteries having the internal resistances close to each other from a group of the used secondary batteries whose internal resistances have been acquired, and an assembling step (Step S3) of combining the used secondary batteries selected, to constitute the battery pack.

In an activation state of a sensor device, when voltage on the connection points between the sensor device and the sensor control circuit becomes a preset abnormal value, electric cut off is made between the sensor control circuit and the connection point. Then, the delivery of power to the heater is ceased to lower the temperature of the cells to a below of an activation temperature, thereby increasing the internal resistance of the cell. Thereafter, the sensor control circuit supplies to the sensor device a current in a degree not to damage the sensor device, to detect voltages on the connection points at that time. By comparing between the voltages on the respective connection points detected, a content and location of abnormality occurred is identified for the sensor device.

An electrode comprises a planar collector, and an active material containing layer disposed on the collector. The active material containing layer comprises a plurality of particles containing an active material, and a binder for binding the particles containing the active material to each other and the particles containing the active material to the collector. The collector has a surface depressed in conformity to a form of the particles containing the active material.

A battery system (SV1) comprises a lithium ion secondary battery (101), charge and discharge control means (S2, S6-S8), and internal resistance detecting means (M1). The charge and discharge control means comprises: mode control means including increasing mode control means (S2) for increasing the internal resistance of the lithium ion secondary battery and decreasing mode control means (S8) for decreasing the internal resistance; and mode selecting means (S6, S7) for selecting the decreasing mode control means (S8) or the increasing mode control means (S2) when a level of the internal resistance is estimated by the internal resistance detecting means.

The invention provides a battery and a preparation method thereof. The battery comprises an anode, a cathode and a diaphragm arranged between the anode and the cathode, wherein the anode comprises an anode collector and an anode active substance coated on the anode collector; the anode active substance is a substance prepared by electrolytic activation of an anode active substance precursor outside the lithium ion battery; and the anode active substance precursor has the formula of xLi2MnO3.yLiMO2, wherein x is more than 0 and less than 1; the y is equal to 1-x; M is one or more kinds of metal ions; and Li2MnO3 and LiMO2 have a layer structure respectively. The battery prepared by the method has high capacity, high stability and excellent cycle performance and accords with the developmentof the prior art.

The invention provides a lithium supplementing negative pole piece, which comprises a porous current collector, lithium supplementing coatings respectively positioned on the upper surface and the lower surface of the porous current collector, and an active substance layer positioned on the surfaces of the lithium supplementing coatings, wherein the through holes of the porous current collector arefurther filled with the lithium supplementing coatings, and the lithium supplementing coating comprises the following components in percentage by mass: 90-98% of metal lithium powder, 1-5% of a mixture of an electronic good conductor and a lithium ion good conductor and 1-5% of a binder. According to the invention, uniform and accurate lithium supplement of the silicon-carbon negative electrode can be realized, the first charge-discharge efficiency and the energy density of the battery are improved, and the conductivity of the silicon-carbon negative electrode piece is improved.

The invention provides a semi-solid lithium flow battery reactor. The semi-solid lithium flow battery reactor comprises a battery frame and an electrode cavity. The battery frame is a cuboid with the hollow interior. The electrode cavity comprises an anode cavity and a cathode cavity. The electrode cavity is filled with continuously or intermittently flowed electrode suspension liquid. A straight-through insulation cavity is installed between the anode cavity and the cathode cavity. The height of the insulation cavity is 0.1-1 mm, and the interior is filled with intermittently flowed electrolyte. The invention further provides an electrolyte circulating system based on the battery reactor and a working method. Through the pressure of the electrolyte in the insulation cavity to a porous current collector is regulated by the electrolyte circulating system, the situation of the battery micro-short or polarization increase can be solved, the battery polarization can be effectively reduced, and the battery safety is improved.

The circuit arrangement for connecting a consumer to an alternating voltage source includes a switch actuator (16) connectable in series with the consumer (12) and an electronic circuit (22) associated with the switch actuator and supplied with a direct voltage by means of it. The switch actuator (16) includes a rectifier for supplying the direct voltage to the electronic circuit, a transformer (24) comprising a secondary winding (32) supplying power to the rectifier, a first low inductance primary winding (26) and a second high inductance primary winding (28) and a switching device (36,42) controlled by the electronic circuit (22) to switch between the primary windings. Another switching device (44) is connected in parallel with the first primary winding (26) in order to short-circuit it for a predetermined short-circuit duration as a function of a nominal power consumed by the consumer. The switching device (36,42) can be a relay or a semiconductor component.

A method for producing an electrode laminate including a current collector using aluminum as the material and an electrode layer laminated on the current collector, where the method includes the steps of: laminating an electrode layer forming composition, which contains at least a sulfide-based solid electrolyte and an active material and no binding agent, on the current collector; and f heating the current collector and the electrode layer forming composition at a temperature of not less than 60° C. and adhering them.