193results about How to "Low self-discharge rate" patented technology

Disclosed is a method of charging a lithium-sulfur electrochemical cell wherein the lithium-sulfur cell comprises a cathode comprising an electroactive sulfur-containing material, an anode comprising lithium, and a nonaqueous electrolyte.

The present invention relates generally to electrolyte materials. According to an embodiment, the present invention provides for a solid polymer electrolyte material that is ionically conductive, mechanically robust, and can be formed into desirable shapes using conventional polymer processing methods. An exemplary polymer electrolyte material has an elastic modulus in excess of 1×106 Pa at 90 degrees C. and is characterized by an ionic conductivity of at least 1×10−5 Scm-1 at 90 degrees C. An exemplary material can be characterized by a two domain or three domain material system. An exemplary material can include material components made of diblock polymers or triblock polymers. Many uses are contemplated for the solid polymer electrolyte materials. For example, the present invention can be applied to improve Li-based batteries by means of enabling higher energy density, better thermal and environmental stability, lower rates of self-discharge, enhanced safety, lower manufacturing costs, and novel form factors.

Disclosed is a method of charging a lithium-sulfur electrochemical cell wherein the lithium-sulfur cell comprises a cathode comprising an electroactive sulfur-containing material, an anode comprising lithium, and a nonaqueous electrolyte.

Disclosed is a method of charging a lithium-sulfur electrochemical cell wherein the lithium-sulfur cell comprises a cathode comprising an electroactive sulfur-containing material, an anode comprising lithium, and a nonaqueous electrolyte. Also disclosed are methods for determining charge termination when charging lithium-sulfur cells.

Disclosed is an electrochemical cell comprising a lithium anode and a sulfur-containing cathode and a non-aqueous electrolyte. The cell exhibits high utilization of the electroactive sulfur-containing material of the cathode and a high charge-dis-charge efficiency.

The invention relates to a high-capacity lithium battery pack, which is provided with a lithium battery pack (1), a charging interface, a discharging interface, a battery protection plate (2), an electric quantity indicating lamp (5), a charging fuse (6), a temperature control charging switch (7) and a discharging fuse (8), wherein the lithium battery pack (1) is formed by connecting a plurality of single battery cells in series; the charging interface and the discharging interface consist of female plugs (3a, 3b) and male plugs (4a, 4b); and the battery protection plate (2) is used for over charge, over discharge and over current protection and battery cell voltage balance of the lithium battery pack (1). Because the high-capacity lithium battery pack is adopted in the lithium battery pack, the lithium battery pack has the advantages of small volume, light weight, portability, easiness for carrying, high power capacity, high-energy density, high efficiency, high bearing capacity, long cycle life, low self-discharge rate, no memory effect, no pollution, excellent constant-voltage source performance and the like; and through the battery protection plate, adverse conditions of over charge, over discharge, over current, over high voltage of the single battery cells and the like are effectively prevented, the quality of the lithium battery pack is remarkably improved, and the lithium battery pack has the advantages of stable performance and long life.

A preparation method of a high-rate lithium ion battery is used for manufacturing of lithium ion batteries and comprises the following steps: reeling prepared positive plate, negative plate and polyolefin diaphragm to form a battery cell, pre-packaging the battery cell with a shell, vacuum-drying, injecting an electrolyte, standing, forming, packaging and capacity-grading so as to obtain a lithium ion battery. By coating single and double surfaces of the positive plate with a conductive carbon layer, electronic conductivity and ion pass rate are enhanced, battery interlayer polarity is reduced, and then internal resistance of battery is reduced and high rate performance of batter are raised. By coating the edge cutting end of the plate with an anti-burr layer, short circuit or micro short circuit which might be caused by burr on the edge of the plate is prevented, self discharge rate is reduced, and safety performance of the battery is enhanced. By the use of the diaphragm with low porosity and under the precondition of guaranteeing high rate performance, self discharge rate and cost of the battery are reduced.

The present invention provides one kind of nanometer alpha-nickel hydroxide and its preparation process. The preparation process adopts bivalent nickel slat as main material, and includes the steps of: adding doping metal salt to compound reaction solution, compounding precipitant solution with potassium hydroxide or sodium hydroxide, adding the precipitant solution to the reaction solution under stirring and ultrasonic dispersing to obtain nickel hydroxide, washing and drying to constant weight. Thus prepared nanometer alpha-nickel hydroxide has small and homogeneous particle size, great specific surface area, high heat stability, stability in alkali medium, high specific discharge capacity, and other features, and may be used as the positive pole material in secondary alkali ZnNi cell, H-Ni cell and FeNi cell.

The present invention relates to the field of cell material, in particular, it relates to a method for preparing positive material nickel oxyhydroxide for zinc-nickel primary cell, zinc-nickel secondary cell and other cells using compound of nickel as active matter, such as cadmium-nickel cell, metal hydride nickel cell and Hawkins cell and nano grade nickel oxyhydroxide prepared by said method. The nano nickel oxyhydroxide is prepared by using nickeous salt as raw material, using sodium hypochlorite as oxidant; adopting precipitation reaction and oxidation reaction simultaneously in alkalineaqueous solution and adopting ultrasonic wave to make oscillation dispersion in the course of reaction. Said invented product is fine and uniform in grain size, large in specific surface area, high in initial discharge specific value, low in self-discharge rate and stable in electric performance.

Disclosed is an additive for an electrochemical cell wherein the additive includes an N—O bond. The additive is most preferably included in a nonaqueous electrolyte of the cell. Also disclosed are cells and batteries including the additive, and methods of charging the batteries and cells. An electrochemical cell including the additive preferably has an anode that includes lithium and a cathode including an electroactive sulfur-containing material.

The invention provides a phase variation lithium ion electrolyte comprising the following components of lithium salts and organic compounds containing acid amide functional groups. The invention also provides a preparation method of the electrolyte, comprising the following steps: a. mixing the lithium salts and the organic compounds containing acid amide functional groups; b. heating the mixture and melting the mixture to obtain transparency liquid; and c. cooling the transparency liquid to obtain the electrolyte, wherein the steps a, b and c are operated in dry environments. The phase variation lithium ion electrolyte is applied to chargeable and dischargeable lithium batteries. In addition, the invention also provides a chargeable and dischargeable lithium battery comprising the electrolyte. The electrolyte has lower electrical conductivity and higher thermal and chemical stability when being a solid under the condition that the temperature is lower than a phase variation temperature and has higher electrical conductivity when being liquid under the condition that the temperature is higher than the phase variation temperature.

A nano-class gamma-nickel hydroxyoxide is prepared through dissolving Ni salt in water, mixing with surfactant and Co (or Zn or Cd) salt, adding dropwise to the alkaline aqueous solution of oxidant, and oxidizing reaction while strong ultrasonic dispersing. Its advantages are low granularity, high specific surface area, high discharge cavacity, low self-discharge rate, high bulk density and high electric stability. It can be used as positive electrode of Zn-Ni battery.