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

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 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 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 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.

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 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.