47results about How to "Raise the discharge potential" patented technology

The invention relates to a copper plating process pre-plating addition agent, comprising a key light agent and an auxiliary light agent, wherein the key light agent comprises (1) a nonionic surfactant, (2) a sulfur and nitrogen containing organic compound, (3) an alcohol compound, (4) an aldehyde compound, (5) a ketone compound, (6) dyes, (7) a metallic salt and (8) water; the auxiliary light agent comprises (1) a nonionic surfactant, (2) an aldehyde compound, (3) dyes, (4) chloride, (5) a metallic salt, (6) water and (7) an inorganic acid. Preplating is a process which directly carries out copper plating in an acidic solution, thereby overcoming the disadvantage that copper plating can not be directly carried out in a steel acidic solution and realizing direct copper preplating on a steel part; moreover, the copper plating process pre-plating addition agent solves the bonding force between a copper plating layer and an iron matrix and realizes the aims of environment protection and lower cost.

An object is to provide a power storage device with high discharge capacity and high energy density. The power storage device includes a positive electrode in which a positive electrode active material is formed over a positive electrode current collector; and a negative electrode which faces the positive electrode with an electrolyte interposed therebetween. The positive electrode active material includes a film-form first region which includes a compound containing lithium and nickel; and a film-form second region which includes a compound containing lithium and one or more of iron, manganese, and cobalt, but not containing nickel. The first region is covered with the second region. Since a superficial portion of the positive electrode active material does not contain nickel, nickel is not in contact with an electrolyte solution; thus, generation of a catalyst effect of nickel can be suppressed, and a high discharge potential of nickel can be utilized.

A power storage device including a positive electrode having a positive electrode active material and a positive electrode current collector; and a negative electrode which faces the positive electrode with an electrolyte provided between the negative electrode and the positive electrode is provided. The positive electrode active material includes a first region which includes a phosphate compound containing lithium and nickel; and a second region which covers the first region and includes a compound containing lithium and one or more of iron, manganese, and cobalt, but not containing nickel. Since the entire superficial portion of a particle of the positive electrode active material does not contain nickel, nickel is not in contact with an electrolyte solution; thus, generation of a catalyst effect of nickel can be suppressed, and a high discharge potential of nickel can be utilized.

The present invention relates to a positive active material for a rechargeable lithium battery and a rechargeable lithium battery including the same. The positive active material includes an active compound that can intercalate/deintercalate lithium ions, and a bismuth (Bi)-based compound on the surface of the active compound. The bismuth (Bi)-based compound in the positive active material of the present invention decreases resistance against acid generated around a positive active material, and plays a role of suppressing structural change of the positive active material and its reaction with an electrolyte solution and preventing dissolution of transition elements therein. Accordingly, the positive active material of the present invention can improve storage and cycle life characteristics at a high temperature. In addition, it can increase charge and discharge, cycle life, and rate characteristics of a rechargeable lithium battery as well as improve mobility of lithium ions in the electrolyte solution.

The invention provides a positive electrode material and a battery using the same which can achieve a higher discharge voltage and which can obtain excellent charge-and-discharge properties, without reducing the capacity. A positive electrode (12) and a negative electrode (14) are configured through a separator (15) in between. The positive electrode (12) contains a compound expressed by a general formula Li_1+xMn_yFe_zPO₄ (wherein x, y and z are values within ranges of 0<x<0.1, 0.5<y<0.95, and 0.9<y+z≦1, respectively). According to the compound, the higher discharge voltage can be obtained due to Mn, the Jahn Teller effect of Mn³⁺ can be attenuated and furthermore distortion of the crystal structure and the reduction of the capacity can be inhibited due to Fe and the excess Li.

A power storage device including a positive electrode in which a positive electrode active material is formed over a positive electrode current collector and a negative electrode which faces the positive electrode with an electrolyte interposed therebetween is provided. The positive electrode active material includes a first region which includes a compound containing lithium and one or more of manganese, cobalt, and nickel; and a second region which covers the first region and includes a compound containing lithium and iron. Since a superficial portion of the positive electrode active material includes the second region containing iron, an energy barrier when lithium is inserted into and extracted from the surface of the positive electrode active material can be decreased.

The sulfide of the present invention comprises an amorphous (lithium) niobium sulfide having an average composition represented by formula (1): Li_k1NbS_n1 (wherein 0≦k1≦5; 3≦n1≦10; and when n1≧3.5, k1≦0.5), or an amorphous (lithium) titanium niobium sulfide having an average composition represented by formula (2): Li_k2Ti_1-m2Nb_m2S_n2 (wherein 0≦k2≦5; 0<m2<1; 2≦n2≦10; and when n2≧3.5, k2≦1.5). The sulfide of the present invention is a material that is useful as a cathode active material for lithium batteries, such as lithium primary batteries, lithium secondary batteries, and lithium ion secondary batteries, and has a high charge-discharge capacity, high electrical conductivity, and excellent charge-discharge performance.

The method consists of procedures of solid phase synthesis and burning in high temperature including following steps. (1) According to lithium: cobalt, manganese, nickel=1-1.1 : 1 (atomic ratio), and cobalt : manganese : nickel=1:1:1, polyacrylamide and neodymia are added into even mixed sources of cobalt, manganese, nickel. The above admixture is mixed round evenly till it becoming colloid. (2) Baking drys the said colloid for 30 hr. under 150 deg.C, and ball milling is carried out till powder is passed through sieve. (3) With being preburned for 10 hr. at 300-450 deg.C, the said powder is cooled to room temperature. (4) Product is obtained after fine ball milling the preburned powder, passing through sieve, burning and sifting the powder by 300 screen mesh again. Comparing with prior art, the invented method adds polyacrylamide and neodymia as well as preburning step so as to possess features of high specific capacity, good cycle performance and pollution-free.

The invention relates to a Cu<2+>/Co<2+>/Ce<4+>/Ag<+>-doped modified ferric fluoride composite positive pole material and a preparation method thereof. The method comprises the following steps: carrying out ball milling on copper salt, cobalt salt, cerium salt, silver salt and synthesis raw material in a high-energy ball mill for some time, and carrying out heat treatment to obtain the FeF3 positive pole material. The Cu<2+> partially occupies the iron ion coordination in FeF3, thereby being beneficial to enhancing the discharge potential and the energy density; the doped Co<2+> is beneficial to enhancing the lithium ion conductivity of the material; the doped high-valence Ce<4+> is beneficial to enhancing the specific capacity of the material; the Ag<+> is doped to lower the conversion reaction activation energy at the time of charging; and thus, the method is beneficial to enhancing the magnification characteristic and energy density, thereby enhancing the comprehensive electrochemical properties of the material.

The invention relates to a steel piece alkaline deep hole nickel plating additive, a pre-plating solution and a pre-plating technology. The steel piece alkaline deep hole nickel plating additive comprises an open cylinder agent and a deep hole agent. The open cylinder agent comprises following substances including an alkalescence complexing agent, an alcohol compound, an additive A, an anionic surfactant, chloride, fluoride, an aldehyde compound, an alkaline compound, a phosphate compound, boric acid and/or a borate compound. The deep hole agent comprises following substances including a phosphate compound, an alkaline compound, chloride, an aldehyde compound and an additive B. The pre-plating solution comprises nickel sulfate heptahydrate and the above nickel plating additive and comprises 15-35 g/L of the nickel sulfate heptahydrate, 200-250 g/L of the open cylinder agent and 15-30 g/L of the deep hole agent, and the pH value of the steel piece alkaline deep hole nickel plating pre-plating solution is 8.5-10.0. By means of the steel piece alkaline deep hole nickel plating additive, the pre-plating solution and the pre-plating technology, pre-plating of the surface of a workpiece,the pipe wall of the workpiece and the inner wall at the deep hole position can be finished at a time; and meanwhile the problem about dissolving of a nickel anode is solved. According to the ammonia-free alkaline deep hole nickel plating technology, secondary pollution is reduced.

The invention relates to a tellurium sulfide polyacrylonitrile cathode material and a preparation method thereof. The preparation method comprises the following steps: commonly heating the vulcanizingagent and telluride agent to prepare tellurium sulfide, commonly heating the polyacrylonitrile, the tellurium sulfide and the catalyst to prepare the tellurium sulfide polyacrylonitrile cathode material. A main chain of the novel cathode composite material obtained through the method is carbon chain containing nitrogen atoms, the side chain is tellurium atoms or sulfur atoms; the adding of the tellurium improves the conductivity of the sulfide polyacrylonitrile cathode material, and the polarization is reduced, and the high discharging level and the excellent rate capability are acquired. Thecharging/discharging is performed on the 100mA/g current density, the average discharging potential of the material is 1.92V and more, the stable cycling capacity can reach 650mAh/g and more. The tellurium sulfide polyacrylonitrile cathode material has important promoting effect for the practicability of the lithium-sulfur battery.

The invention provides a biomass carbon material derived transition metal-based catalyst, a preparation method and application thereof, and a solid-state zinc air battery, and belongs to the technical field of zinc air batteries. According to the invention, mushroom spores are used as a carbon source, and the mushroom spores mainly contain C, N and O, so that the determination of active sites of the catalyst is not influenced. Moreover, the mushroom spores show a porous characteristic after being carbonized and activated, so that loading of a metal precursor and exposure of active sites are facilitated, and the overall catalytic activity of the catalyst is effectively improved. The transition metal precursor is subjected to heat preservation to form a single metal atom supported catalyst, transition metal atoms are uniformly dispersed on the catalyst carrier, and the catalytic activity of the catalyst can be remarkably improved. When the single metal atom supported catalyst is used for the solid-state zinc-air battery, the discharge potential of the battery can be remarkably improved, that is, the power density of the battery is improved.

The invention discloses an anode of a nickel-metal hydride battery and a preparation method of the anode. The anode comprises a current collector and an anode material filled and coated on the current collector, wherein the anode material comprises 2-5wt% of bonding agent, 80-90wt% of Mg-doped beta-Ni(OH)2 and 8-15wt% of nickel powder. Compared with the prior art, the invention has the advantages that the doping of Mg is favorable for increasing the utilization rate of nickel electroactive materials, increasing the discharge potential of a nickel electrode, prolonging the service life of the nickel electrode and improving the usability and the large-current discharge capacity of the nickel electrode in a wide temperature range; and furthermore, HPMC (Hydroxy Propyl Methyl Cellulose) and PTFE (Polytetrafluoroethylene) are adopted as the bonding agent to form a layer of dense three-dimensional mesh structure on the surface of the anode, so that the expansion of a polar plate in a charge/discharge is inhibited, in addition, the falling of active materials can be reduced, and the cyclic life of the nickel electrode is better prolonged.

The invention provides a preparation method of a lithium ion battery cathode. The active substances of the cathode comprise a first active substance, a second active substance and a third active substance, the first active substance is LiNi0. 8Co0. 1Mn0. 1O2, and D50 is 1.5-1.7 [mu] m; the second active substance is LiNi0. 4Co0. 3Mn0. 3O2, and the D50 is 600 to 650 nm; the third active substance is LiCo0. 5Mn0. 47Al0. 03O2, and D50 is 2.5 to 2.8 [mu] m. The preparation method comprises the steps of preparing the first active substance, the second active substance and the third active substanceinto the first slurry, the second slurry and the third slurry respectively, then mixing the first slurry and the second slurry in proportion to obtain the fourth slurry, and mixing the second slurryand the third slurry in proportion to obtain the fifth slurry; coating and drying the first slurry, the fourth slurry, the second slurry, the fifth slurry and the third slurry in sequence to obtain acathode active material layer, and then coating the surface of the active material layer with a nano Al2O3 passivation layer to obtain the battery cathode. The cathode prepared by the preparation method of the invention has the relatively higher high-temperature rate capability and high-temperature cycle performance.

A chlorine-modified lithium manganese-based AB₂O₄ spinel cathode material is provided. Furthermore, a lithium or lithium ion rechargeable electrochemical cell is provided incorporating chlorine-modified lithium manganese-based AB₂O₄ spinel cathode material in a positive electrode. In addition, a process for preparing a stable chlorine-modified lithium manganese-based AB₂O₄ spinel cathode material is provided.

A method of preparing a homogeneously dispersed chlorine-modified lithium manganese-based AB₂O₄ spinel cathode material is provided. Furthermore, a homogeneously dispersed chlorine-modified lithium manganese-based AB₂O₄ spinel cathode material is provided. In addition, a lithium or lithium ion rechargeable electrochemical cell is provided incorporating a homogeneously dispersed chlorine-modified lithium manganese-based AB₂O₄ spinel cathode material in a positive electrode.

The invention discloses an anode material of a nickel-metal hydride battery. The anode material is prepared from the following raw materials in parts by weight: 90-100 parts of active substance, 0.05-3 parts of conductive agent, 6-10 parts of adhesive and 0.2-1 part of additive. By adopting the anode material of the battery, the utilization rate of a nickel electric active substance is effectively improved, the discharge potential of a nickel electrode is improved, the service life of the nickel electrode is prolonged, and the use performance and the large-current discharge capability of the nickel electrode within a large temperature range are improved.