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

The present invention relates to a method of preparing a positive active material for a rechargeable lithium battery, a positive active material prepared according to the method, and a rechargeable lithium battery including the same. This manufacturing method includes preparing a complex salt solution by mixing a solution including a metal source material and a chelating agent, disposing the complex salt on the surface of a lithium-included compound by adding a lithium-included compound to the complex salt solution, adding a solution including a fluorine source material to the solution including a lithium-included compound with the complex salt on the surface, and heat-treating the mixture. The present invention provides a simple method of economically preparing a positive active material in which structural transition on the surface is prevented and securing a uniform coating layer. In addition, the positive active material can have improved charge and discharge characteristics, cycle life characteristic, and rate characteristic. It also has improved ion conductivity, and accordingly can improve mobility of lithium ions in an electrolyte and thereby improve discharge potential of a battery. Furthermore, the positive active material can decrease the amount of a conductive material and increase density of a substrate.

A F-type electrochemical cell, which is a lithium air battery, includes a positive electrode facing a negative electrode composed of metallic lithium with a separator provided therebetween in a casing. Air is capable of flow to the positive electrode. A nonaqueous electrolytic solution is charged into a space between the positive electrode and the negative electrode. At least one of the positive electrode and the nonaqueous electrolytic solution of the lithium air battery contains a compound having a stable radical skeleton. The compound also serves as a redox catalyst for oxygen.

The invention relates to an anode active material for a secondary lithium battery and a secondary lithium battery containing the anode active material. The anode active material contains an active compound which can be embedded with and separated from a lithium ion and a bismuth (Bi) compound on the surface of the active compound. The bismuth compound on the surface of the active compound can suppress possibly generated structural change of the anode active material and solve the reaction problem between the anode active material and electrolyte due to impedence reduction of acid generated near the anode active material, so as to prevent a transition metal which is composed of the anode active material from being dissolved. Therefore, the anode active material can improve the high-temperature storage characteristic and high-temperature cycle life characteristic of the secondary lithium battery, improve the lithium ion mobility in the electrolyte, bring an improved effect on a discharge potential and also enhance the charging and discharging characteristics, service life characteristic and multiplying power characteristic of the secondary lithium battery.

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.

The invention relates to a technology for cladding a-Co(OH)2 on spheral nickel hydroxide. Tap density of prepared cobalt coated spheral nickel hydroxide can reach about 2.2g / cm3. The main method is to clad a layer alpha-Co(OH)2 mixed with one of more than one metal M from Y, Al, Cr, Mn, Yb, Sc, La, In, Ti, Zn, when (Co+M) / Ni ratio (mole ratio) is 0.3-0.1, conductive performance of sphere nickel hdyroxide product is abvisouly improved, Ni(OH)2 electrode performance is increased, further the cell performance as specific capacity, out power, charge-discharge circulating life, rapid charging ability, over charge / discharge resistance ability and oxygen separating overtention etc. are obviously increased.

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 invention discloses an aromatic condensed ring quinones compound positive pole material for a one-class lithium secondary battery. The compound is a quinones compound which takes benzoquinone or isobenzoquinone with an aromatic condensed ring structure as a electrochemical oxidation reduction reaction locus, and the compound comprises an aromatic condensed ring benzoquinone derivative and an aromatic condensed ring isobenzoquinone derivative; the compound can join in pole preparation in a molecular crystal or polymer mode; in the polymer mode, corresponding structural units are directly connected through C-C bonds or connected through S atoms; and the benzoquinone / isobenzoquinone which is stabilized through an aromatic (hetero) condensed ring is used as the electrochemical oxidation reduction reaction locus and is compounded with conductive carbon in the molecular crystal or polymer mode so as to prepare the pole. The material has the advantages that the positive pole material has high energy density, rate power density and circulation stability, 86% of the initial capacity can be still maintained after being circulated for 50 cycles, so that the material can be probably applied to the next generation of environmental-friendliness energy storage batteries with high energy and high power.

A F-type electrochemical cell, which is a lithium air battery, includes a positive electrode facing a negative electrode composed of metallic lithium with a separator provided therebetween in a casing. Air is capable of flow to the positive electrode. A nonaqueous electrolytic solution is charged into a space between the positive electrode and the negative electrode. At least one of the positive electrode and the nonaqueous electrolytic solution of the lithium air battery contains a compound having a stable radical skeleton. The compound also serves as a redox catalyst for oxygen.

The invention discloses a nickel-hydrogen battery cathode material, which is composed of the following raw materials in parts by weight: active material 90-100, conductive agent 0.05-3, binder 6-10, additive 0.2-1; the invention Advanced battery cathode materials can effectively improve the utilization rate of nickel electroactive materials, improve the discharge potential and service life of nickel electrodes, and improve the performance and high-current discharge capacity of nickel electrodes in a wide temperature range.

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 Li1+xMnyFezPO4 (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 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 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.

The invention relates to a Cu<2+>, Ce<4+>, Ag<+> doping modified iron fluoride positive pole material and a preparation method thereof. The method comprises the following step: performing ball milling on copper salt, cerium salt, silver salt and synthesis raw materials in a high-energy ball mill for a certain time, and performing heat treatment to obtain the FeF3 positive pole material. The Cu<2+> partially occupies iron ions of FeF3 for coordination, thereby being beneficial to increase the discharge potential and improve the energy density; the high-valence Ce<4+> is doped, thereby being beneficial to increase the specific capacity of the material; and the Ag<2+> is doped, thereby reducing the conversion reaction activation energy during charge. Thus, the invention is beneficial to improve the rate characteristic and energy density, thereby improving the comprehensive electrochemical property of the material.