49results about How to "Improve self-discharge" patented technology

The invention discloses rare earth-magnesium-nickel system heterogeneous hydrogen storage alloys used for nickel-hydrogen batteries and a preparing method thereof. The alloys are characterized in that: the general structure formula of the alloys is LnMgNi<x>Y<y>Z<z>, wherein the Ln is at least one element selected from rare earth elements; the Y is at least one element selected from a group comprising Co, Mn, Al, Cu, Nb, V, Fe, Zn, Ti, Cr, As, Ga, Mo, Sn, In, W, Si, B and P; the Z is at least one element selected from a group comprising Ag, Sr, Ge and Au; the a is less than 1 and not less than 0.5; the b is less than 0.5 and more than 0; the x is more than 2.5 and less than 4.5; the y is more than 0 and less than 2; the z is more than 0 and not more than 1; an AB5 phase accounts for 10-90%; an A2B7 phase accounts for 10-90%; and the ratio of other impurity phases is not more than 30%. B side elements are replaced by the Ag, the Sr, the Ge, the Au, and the like, alloy components and an annealing process are optimized, and the ratio of the AB5 phase to the A2B7 phase in the product is adjusted, thus increasing the discharge capacity of the hydrogen storage alloy, prolonging the cycle lifetime of the hydrogen storage alloy, and improving self-discharge and low-temperature properties.

The invention provides a positive electrode, comprising a positive plate, a positive current collector and a bonding layer arranged between the positive plate and the positive current collector, wherein the positive plate comprises a positive electrode active substance capable of realizing reversible deintercalation-intercalation of a first metal ion, and the bonding layer comprises a binder and a conductive agent. The positive electrode provided by the invention has good corrosion resistance and high consistency. The invention also provides a battery containing the positive electrode. According to the battery provided by the invention, the problem of corrosion of the conductive agent in the positive electrode can be improved, so the problem of self-discharging of the battery is further improved and the electrochemical performance of the battery is improved.

Active material for a positive electrode of a rechargeable alkaline electrochemical cell is made with nickel hydroxide particles or cobalt-coated nickel hydroxide particles treated with strongly oxidizing reagents such as alkali metal persulfate in alkaline solution. The active material also may be made with cobalt-coated nickel hydroxide particles having a high percentage of cobalt(III) on a surface or an average cobalt oxidation state of about 3 measured across the particles. The treated nickel hydroxide or cobalt-coated nickel hydroxide decreases the cobalt solubility in the alkaline electrolyte and increases the high-rate charge and discharge capability. The lower cobalt solubility decreases cobalt migration that can increase self discharge and lead to premature failure.

The invention relates to a graphene coated lithium battery cathode material and a preparation method thereof. The graphene coated lithium battery cathode material is prepared from the following components in parts by weight: 15-25 parts of graphene oxide, 80-85 parts of active material, 5-10 parts of functional material, 3-5 parts of conductive material and 3-5 parts of binding material, wherein the functional material is 60% lithium iron nitrate solution; the cathode material is lithium manganate; the conductive agent is flake graphite. The defect of failure of lithium ion batteries caused by self-discharge of protection boards is overcome by adopting the graphene coated lithium battery cathode material, thus improving self-discharge of the whole battery pack, achieving the aim of prolonging the lithium battery storage time and ensuring that the lithium batteries can be stored for a longer time under the condition that users do not charge the electric appliances after using the electric appliances.

A hydrogen storage alloy of the present invention includes component A including a rare earth element represented by Ln and magnesium and component B including elements containing at least nickel and aluminum, wherein a primary alloy phase of a hydrogen storage alloy represents an A5B19 type structure; a general formula is represented as Ln1-xMgxNiy-a-bAlaMb (wherein M represents at least one element selected from Co, Mn, and Zn; and 0.1≦x≦0.2, 3.6≦y≦3.9, 0.1≦a≦0.2, and 0≦b≦0.1); a rare earth element Ln includes maximally two elements containing at least La; and absorption hydrogen equilibrium pressure (Pa) is 0.03-0.17 MPa when the hydrogen amount absorbed in the hydrogen storage alloy (H / M (atomic ratio)) at 40° C. is 0.5.

The invention provides a battery comprising a cathode, an anode, and an electrolyte solution. According to the battery, the cathode comprises a cathode active material capable of realizing reversible deintercalation-intercalation into first metal ions, and a cathode conductive agent; the electrolyte solution comprises a solvent capable of dissolving and ionizing electrolytes; the electrolytes comprise the first metal ions and second metal ions; in charging and discharging processes, the second metal ions can be transformed into a second metal via reduction and be deposited on the anode, and the second metal can be reversibly transformed into the second metal ions via oxidation dissolving; the battery also comprises an additive which is added into at least one of the cathode or the electrolyte solution; and the additive is a non-reduced type anti-oxidant. The battery is capable of avoiding corrosion caused by the conductive agent in the battery cathode, improving a problem of battery self-discharging further, and improving battery electrochemical performance.

The invention provides a high-performance doped lithium manganate positive electrode material. At least one of the following elements of Nb, F and B are doped in lithium manganate, wherein molar ratios of Nb, F and B to the lithium manganate are 0.002 to 0.005, 0.05 to 0.15 and 0.001 to 0.005. During production, the preparation method comprises the following operation steps of weighing MnO2, Li2CO3 and a doped element source compound proportionally; carrying out ball milling and mixing for 0.5 to 3 hours; roasting at 700 to 900 DEG C for 10 to 30 hours; introducing excess air, and then slowlycooling; and performing screening, sampling inspection and packaging. Compared with an undoped lithium manganate positive material, the tap density of the doped lithium manganate positive electrode material provided by the invention is improved by at least 0.3 to 0.5 gram per cubic centimeter, after a lithium battery is assembled, the self-discharge problem is remarkably improved; and after high-temperature circulation at 1 C and 55 DEG C for 300 times, the capacity retention rate is still more than 85%.

The invention provides a battery. The battery comprises a cathode, an anode, and an electrolyte solution. According to the battery, the cathode comprises a cathode active material capable of realizing reversible deintercalation-intercalation of first metal ions; the electrolyte solution comprises a solvent capable of dissolving and ionizing electrolytes; the electrolyte solution comprises the first metal ions and second metal ions; in charging and discharging processes, the second metal ions can be transformed into a second metal via reduction and be deposited on the anode, and the second metal can be reversibly transformed into the second metal ions via oxidation dissolving; wherein, the cathode also comprises a silicon dioxide additive. The battery is capable of improving a problem of battery self-discharging, and improving battery electrochemical performance.

The invention provides an electrochemical device and an electronic device. The electrochemical device comprises an electrode plate, the electrode plate comprises a current collector and an active substance layer, at least one surface of the electrode plate is provided with a fiber isolation layer, the fiber isolation layer comprises polymer fibers, and the tortuosity tau 0 of the polymer fibers is larger than 1.2 and smaller than 1.9. The fiber isolation layer improves the self-discharge problem of the electrochemical device, so that the performance of the electrochemical device is improved.

A circuit system includes a battery management system, a first switch unit and a controller. In a first state, the first switch unit conductively connects a first energy source to the battery management system, and in a second state it interrupts the energy supply of the battery management system from the first energy source. The controller controls the first switch unit.

Provided is a nonaqueous electrolyte secondary battery that is less likely to cause positive electrode degradation due to storage at high temperature in a charged state and has superior remaining capacity, recovering capacity, and discharge characteristics after storage at high temperature. The nonaqueous electrolyte secondary battery according to an aspect of the invention includes a positive electrode, a negative electrode, a separator, and a nonaqueous electrolyte. The nonaqueous electrolyte contains at least LiPF6. The nonaqueous electrolyte also contains a dinitrile compound represented by Chemical Formula NC—R—CN (where R is a saturated straight chain hydrocarbon group) and magnesium hydroxide. The number of carbon atoms of the saturated straight chain hydrocarbon group R in the dinitrile compound is preferably 5 to 10.

The invention relates to a high-purity sulfur / charcoal-coated lithium cobalt oxide positive electrode material and a preparation method thereof. The high-purity sulfur / charcoal-coated lithium cobalt oxide positive electrode material is prepared from the following components by weight: 30 parts of a sulfur / charcoal composite material, 60 parts of lithium cobalt oxide, 25 parts of a lithium ferric nitrate solution with a concentration of 45%, 3 parts of flake graphite and 3 parts of a bonding material. The high-purity sulfur / charcoal-coated lithium cobalt oxide positive electrode material overcomes the defect of failure caused by self-discharging of a protection plate of a lithium ion battery, so self-discharging of a whole battery pack is improved, the purpose of prolongation of the storage time of the lithium battery is achieved, and it is guaranteed that the lithium battery can be stored for a long time under the condition that a user does not charge an electric appliance after usage.

The invention provides a battery. The battery comprises a cathode, an anode, and an electrolyte solution. According to the battery, the cathode comprises a cathode active material capable of realizing reversible deintercalation-intercalation of first metal ions; the electrolyte solution comprises a solvent capable of dissolving and ionizing electrolytes; the electrolyte solution comprises the first metal ions and second metal ions; in charging and discharging processes, the second metal ions can be transformed into a second metal via reduction and be deposited on the anode, and the second metal can be reversibly transformed into the second metal ions via oxidation dissolving; wherein, the cathode also comprises a graphite conductive agent SFG. The battery is capable of improving a problem of battery self-discharging, and improving battery electrochemical performance.

The invention relates to an efficient sulfur / carbon doped lithium cobalt oxide cathode material and a preparation method thereof. The efficient sulfur / carbon doped lithium cobalt oxide cathode material is prepared from the following components in parts by weight: 30 parts of sulfur / carbon composite material, 95 parts of active material, 3 parts of functional material, 6 parts of conductive material and 6 parts of binding material, wherein the functional material is 60% lithium iron nitrate solution; the cathode material is lithium cobalt oxide; the conductive agent is flake graphite. The defect of failure of lithium ion batteries caused by self-discharge of protection boards is overcome by adopting the efficient sulfur / carbon doped lithium cobalt oxide cathode material, thus improving self-discharge of the whole battery pack, achieving the aim of prolonging the lithium battery storage time and ensuring that the lithium batteries can be stored for a longer time under the condition that users do not charge the electric appliances after using the electric appliances.

The invention provides a nickel-metal hydride battery positive electrode powder material. The nickel-metal hydride battery positive electrode powder material is composed of the following components in percentage by mass: 35%-60% of spherical Ni(OH)2, 35%-62% of cobalt-cladded spherical Ni(OH)2, 2.5%-6% of CoO powder and 0.5%-1.0% of a binding agent; and the sum of the mass percents of all the components is 100%. Meanwhile, the invention further provides a preparation method of a nickel-metal hydride battery. The nickel-metal hydride battery prepared by the preparation method has good low-temperature discharging performance, high discharging efficiency and low self discharge.

The invention relates to a lithium battery cathode material. The lithium battery cathode material is prepared from the following components in parts by weight: 85-95 parts of active material, 3-8 parts of functional material, 3-5 parts of conductive materials and 3-5 parts of binding material, wherein the functional material is 60% lithium iron nitrate solution; a cathode material is lithium cobalt oxide; the conductive agents comprise a main conductive agent and an auxiliary conductive agent; the main conductive agent is conductive graphite; the auxiliary conductive agent is flake graphite. The defect of failure of lithium ion batteries caused by self-discharge of protection boards is overcome by adopting the lithium battery cathode material, thus improving self-discharge of the whole battery pack, achieving the aim of prolonging the lithium battery storage time and ensuring that the lithium batteries can be stored for a longer time under the condition that users do not charge the electric appliances after using the electric appliances.

The invention provides a method for prolonging the storage time of a lithium battery and a lithium battery positive electrode material. In the method, under the condition of no change of the conventional negative electrode, lithium iron phosphate is added into the conventional lithium battery positive electrode material. The lithium battery positive electrode material consists of the following components in percentage by weight: 80 to 93 percent of positive electrode active material, 5 to 10 percent of lithium iron phosphate, 1 to 5 percent of conductive agent, and 1 to 5 percent of cementing agent. Under the condition of no change of the conventional negative electrode, a small amount of lithium iron phosphate is added into the components of the conventional lithium battery positive electrode material to improve the phenomenon of the invalidation of lithium battery caused by the self discharge of a protection board, so the self discharge of the whole battery pack is improved, the aim of prolonging the storage time of lithium battery is achieved, and the long storage time of the lithium battery can be guaranteed under the condition that a user uses electrical equipment and does not charge the electrical equipment; a manufacturing process of the lithium battery is not required to be changed; the method is simple; and the cost is low.

The invention relates to a modified sulfur / charcoal coated lithium nickelate positive electrode material and a preparation method thereof. The modified sulfur / charcoal coated lithium nickelate positive electrode material is prepared from the following components by weight: 40 parts of a sulfur / charcoal composite material, 50 parts of lithium nickelate, 20 parts of a lithium ferric nitrate solution with a concentration of 45%, 5 parts of flake graphite and 5 parts of a bonding material. The modified sulfur / charcoal coated lithium nickelate positive electrode material overcomes the defect of failure caused by self-discharging of a protection plate of a lithium ion battery, so self-discharging of a whole battery pack is improved, the purpose of prolongation of the storage time of the lithium battery is achieved, and it is guaranteed that the lithium battery can be stored for a long time under the condition that a user does not charge an electric appliance after usage.

The invention discloses an application of an additive capable of removing active oxygen species in a lithium ion battery, the additive is added into an electrolyte in the lithium ion battery, and the additive is an organic matter containing bitriene, an anthryl structure unit, a tertiary aromatic amino group, a nitrogen-containing heterocyclic ring or a selenium-containing active functional group. According to the invention, the additive is added into the electrolyte, so that the active functional group contained in the additive can be subjected to cycloaddition reaction with active oxygen species generated in the battery, thereby obviously reducing electrolyte oxidation caused by the active oxygen species, and being beneficial to constructing a thin positive electrode / electrolyte interface layer with high ion transport property; the high-rate charge-discharge performance of the battery can be realized; in addition, the additive can also obviously improve the self-discharge of the battery and avoid the overcharge of the battery.

A battery separator comprises: a divided compound fiber (A), a polyolefine compound fiber (B), as the necessary components, and, optionally, a non-woven fabric of a third synthetic fiber (C). Based on 100 weight % of the total amount of the constituent fibers, each of the divided compound fiber (A) or the polyolefine compound fiber (B) shall not exceed 60 weight %. Furthermore, the non-woven fabric has been subjected to a hydrophilic treatment. The divided compound fiber (A) comprises a methyl pentene polymer (formed of poly (4-methylpentene-1) or 4-methylpentene-1 and other olefine polymer) as a first component and a polyolefine polymer different from the first component or its copolymer as a second component. The second component is interleaved and adjacent to each other in fiber cross-section. Furthermore, at least one component in the second component is divided into more than one. The polyolefine compound fiber (B) comprises a high melting point component and a low melting point component.

The invention relates to a lithium ion battery cathode material and a preparation method thereof. The lithium ion battery cathode material is prepared from the following components in parts by weight: 75-80 parts of active material, 10-15 parts of functional material, 5-7 parts of conductive materials and 5-7 parts of binding material, wherein the functional material is 65% lithium iron nitrate solution; the cathode material is lithium cobalt oxide; the conductive agents comprise a main conductive agent and an auxiliary conductive agent; the main conductive agent is conductive graphite; the auxiliary conductive agent is flake graphite. The defect of failure of lithium ion batteries caused by self-discharge of protection boards is overcome by adopting the lithium ion battery cathode material, thus improving self-discharge of the whole battery pack, achieving the aim of prolonging the lithium battery storage time and ensuring that the lithium batteries can be stored for a longer time under the condition that users do not charge the electric appliances after using the electric appliances.

The invention relates to a modified graphene-doped lithium nickelate battery cathode material and a preparation method thereof. The modified graphene-doped lithium nickelate battery cathode material is prepared from the following components in parts by weight: 30 parts of graphene oxide, 60 parts of lithium nickelate, 25 parts of 45% lithium iron nitrate solution, 3 parts of flake graphite and 3 parts of binding material. The modified graphene-doped lithium nickelate battery cathode material overcomes the defect of failure of lithium ion batteries caused by self-discharge of protection boards, so that self-discharge of the whole battery pack is improved, the aim of prolonging the storage time of lithium batteries is achieved, and the lithium batteries can be stored for a longer time under the condition that users do not charge electric appliances after using the electric appliances.

A separator provided by the present invention includes a base material and a coating layer, and the raw materials of the coating layer include polyhydric alcohol and / or polyamine, ceramic particles and a coupling agent. The membrane prepared by the invention has good stability.

The invention relates to a modified graphene-coated lithium nickelate positive electrode material of a battery and a preparation method thereof. The modified graphene-coated lithium nickelate positive electrode material is prepared from the following components by weight: 50 parts of graphene oxide, 40 parts of lithium nickelate, 30 parts of a lithium ferric nitrate solution with a concentration of 45%, 8 parts of flake graphite and 8 parts of a bonding material. The modified graphene-coated lithium nickelate positive electrode material overcomes the defect of failure caused by self-discharging of a protection plate of a lithium ion battery, so self-discharging of a whole battery pack is improved, the purpose of prolongation of the storage time of the lithium battery is achieved, and it is guaranteed that the lithium battery can be stored for a long time under the condition that a user does not charge an electric appliance after usage.

The invention relates to a lithium battery cathode composition. The lithium battery cathode composition is prepared from the following components in parts by weight: 85-95 parts of active material, 3-8 parts of functional material, 3-5 parts of conductive materials and 3-5 parts of binding material, wherein the functional material is 70% lithium iron phosphate solution; a cathode material is lithium manganate; the conductive agents comprise a main conductive agent and an auxiliary conductive agent; the main conductive agent is conductive graphite; the auxiliary conductive agent is flake graphite. The defect of failure of lithium ion batteries caused by self-discharge of protection boards is overcome by adopting the lithium battery cathode composition, thus improving self-discharge of the whole battery pack, achieving the aim of prolonging the lithium battery storage time and ensuring that the lithium batteries can be stored for a longer time under the condition that users do not charge the electric appliances after using the electric appliances.

The invention relates to a modified graphene coated lithium manganate battery cathode material and a preparation method thereof. The modified graphene coated lithium manganate battery cathode material is prepared from the following components in parts by weight: 30 parts of graphene oxide, 60 parts of lithium manganate, 25 parts of 45% lithium iron nitrate solution, 3 parts of flake graphite and 3 parts of binding material. The modified graphene coated lithium manganate battery cathode material has the effect of overcoming the defect of lithium ion battery failure caused by self-discharge of protection boards, thus improving self-discharge of a whole battery pack, achieving the aim of prolonging the lithium battery storage time and ensuring that lithium batteries can be stored for a longer time under the condition that users do not charge the lithium batteries after using electric appliances.

The invention relates to an efficient sulfur / carbon coated lithium nickelate cathode material and a preparation method thereof. The efficient sulfur / carbon coated lithium nickelate cathode material is prepared from the following components in parts by weight: 45 parts of sulfur / carbon composite material, 45 parts of lithium nickelate, 30 parts of 45% lithium iron nitrate solution, 8 parts of flake graphite and 8 parts of binding material. The efficient sulfur / carbon coated lithium nickelate cathode material overcomes the defect of failure of lithium ion batteries caused by self-discharge of protection boards, so that self-discharge of the whole battery pack is improved, the aim of prolonging the storage time of lithium batteries is achieved, and the lithium batteries can be stored for a longer time under the condition that users do not charge electric appliances after using the electric appliances.

The invention relates to a novel lithium ion battery cathode material. The novel lithium ion battery cathode material is prepared from the following components in parts by weight: 70-75 parts of active material, 5-10 parts of functional material, 4-7 parts of conductive materials and 4-7 parts of binding material, wherein the functional material is 60% lithium iron nitrate solution; the cathode material is lithium manganate; the conductive agents comprise a main conductive agent and an auxiliary conductive agent; the main conductive agent is conductive graphite; the auxiliary conductive agent is flake graphite. The defect of failure of lithium ion batteries caused by self-discharge of protection boards is overcome by adopting the novel lithium ion battery cathode material, thus improving self-discharge of the whole battery pack, achieving the aim of prolonging the lithium battery storage time and ensuring that the lithium batteries can be stored for a longer time under the condition that users do not charge the electric appliances after using the electric appliances.

The invention relates to a novel lithium ion battery cathode composition. The novel lithium ion battery cathode composition is prepared from the following components in parts by weight: 70-75 parts of active material, 5-10 parts of functional material, 4-7 parts of conductive materials and 4-7 parts of binding material, wherein the functional material is 70% lithium iron phosphate solution; the cathode material is lithium chromate; the conductive agents comprise a main conductive agent and an auxiliary conductive agent; the main conductive agent is conductive graphite; the auxiliary conductive agent is flake graphite. The defect of failure of lithium ion batteries caused by self-discharge of protection boards is overcome by adopting the novel lithium ion battery cathode composition, thus improving self-discharge of the whole battery pack, achieving the aim of prolonging the lithium battery storage time and ensuring that the lithium batteries can be stored for a longer time under the condition that users do not charge the electric appliances after using the electric appliances.