61results about How to "Improve overcharge performance" patented technology

The invention discloses a fast ion conductor modified lithium ion battery anode material lithium cobalt oxide comprising lithium cobalt oxide and a lithium fast ion conductor layer coating the outer surface of the lithium cobalt oxide. The lithium fast ion conductor layer comprises the components of Li1+x+yAxB2-xSiyP3-yO12-eN, wherein A is one or more than one of Al, Sc, La, Cr, Fe, Tl, Eu and In, B is one or more than one of Ti, Zr and Hf, N is one or more than one of Li2O, MgO and Y2O3, and x, y and e are all not less than 0 and not more than 2. The preparation method of the fast ion conductor modified lithium ion battery anode material lithium cobalt oxide comprises the following steps of: evenly mixing A, B an N sources, lithium salt, a silicon source, a phosphorus source and a lithium ion battery anode material to be modified, carrying out the processes of drying, roasting, crushing, screening and the like to prepare the lithium ion battery anode material coated with a phosphate system on the surface. The modified anode material lithium cobalt oxide not only can work under a higher voltage and greatly improve the battery capacity, but also greatly improves the cycle performance, the multiplying power performance, the overcharging performance and the safety performance thereof.

The invention discloses an aqueous electrolyte solution of a secondary lithium ion battery with ferric phosphate considering as the positive material and with both the high temperature performance and the low temperature performance. The aqueous electrolyte solution comprises LiPF6 lithium salt, an organic solvent and a film-forming additive, and is characterized in that the electrolyte solution further comprises high temperature additive; the organic solvent is composed of one or a plurality of carbonic esters and one or more carboxylic esters with low melting point and high boiling point. The carboxylic esters with low melting point and high boiling point are selected from one or a combination of methyl butyrate, ethyl butyrate, propyl butyrate and butyl acetate. The high temperature additive is 1, 3- propane sultone and 1, 4- butane sultone. The electrolyte solution is used for maintaining both the circulation performance in a high temperature state and the low temperature laying performance of the secondary lithium ion battery with the ferric phosphate lithium as the positive material.

The invention discloses a coating for a lithium-battery diaphragm, the diaphragm and a preparation method for the diaphragm. The coating for the lithium-battery diaphragm comprises powder of a lithium titanate compound and an adhesive, wherein the lithium titanate compound is one or more selected from a group consisting of Li<4+x>Ti<5>O<12> and Li<1+x>Ti<2>(PO<4>)<3>, wherein x is no less than 0 and no more than 3. The coating for the lithium-battery diaphragm can improve the puncture strength of the diaphragm and supplement lithium to an electrical core, and the preparation method is simple in process and easy to operate. Compared with conventional coatings, Li<4+x>Ti<5>O<12> provided by the invention is a substance with certain electron conductivity and high ion conductivity, so the ion conductivity of an electrolyte can be improved and the electrical properties of the electrical core are enhanced; under the condition of over-charging, Li<4+x>Ti<5>O<12> can store a part of Li ions, effectively prevent precipitation of surplus lithium and improve the over-charging performance of the electrical core; and compared with conventional lithium supplementing technology, the coating is easier to operate and enables security to be substantially improved.

The invention belongs to the field of lithium-ion batteries, and particularly relates to a non-aqueous electrolyte solution and a lithium-ion battery using the same. The non-aqueous electrolyte solution comprises a non-aqueous organic solvent, lithium salts and additives; the non-aqueous organic solvent comprises at least one cyclic lactone compound; the additives comprise at least a negative electrode film-forming additive and at least a positive electrode passivation protective agent; and the positive electrode passivation positive agent is selected from at least one of 3,4-ethylenedioxythiophene, a cyclic anhydride phosphonate compound and a nitrile compound. The reduction potential of the negative electrode film-forming additive in the non-aqueous electrolyte solution is higher than that of the cyclic lactone compound, and a steady negative electrode passivation film can be formed; the positive electrode passivation protective agent can suppress oxygenolysis of the cyclic lactone compound at the positive electrode, so that the overcharging performance of the lithium-ion battery not only can be improved, but the cycle performance of the battery is also not affected.

The invention relates to a composite conductive agent, a lithium ion battery positive electrode and a lithium ion battery. The composite conductive agent consists of conductive carbon black, conductive graphite and a carbon nano tube according to the weight ratio of (1.5-2.0):(1.4-2.0):(0.7-1.0). According to the composite conductive agent provided by the invention, the conductive carbon black isrelatively small in particle size and belongs to a dot-shaped conductive agent; the carbon nano tube is provided with a linear structure and belongs to a linear conductive agent; the conductive graphite is of a laminated structure and belongs to a planar conductive agent; through the organic combination of three different dimensions of conductive agents in a ternary battery, the advantages of allthe conductive agents can be comprehensively utilized, a synergetic coupling effect is fully played, the direct-current internal resistance is reduced in multiple aspects of improving the compaction,promoting the dispersion, constructing a conductive network, improving the ionic and electronic conductivity and the like, and finally, the purpose of optimizing the overcharge performance of the ternary battery is realized.

The invention relates to a lithium supplementing method for a lithium iron phosphate lithium ion battery and the lithium iron phosphate lithium ion battery. The lithium ion battery is formed by assembling a positive plate, a negative plate and a diaphragm, a positive material in the positive plate comprises lithium iron phosphate, a conductive agent, a binder and a lithium supplement additive lithium-rich manganese material xLi2MnO3.(1-x) LiTMO2, x is more than 0 and less than 1, TM is one or more of Ni, Co and Mn, and x is more than 0 and less than 1. A negative electrode material in the negative electrode plate comprises a negative electrode active substance, a conductive agent and a lithium-containing binder; and after the positive electrode plate, the negative electrode plate and the diaphragm are assembled into the battery, the battery is pre-charged and formed in a mode of combining step current and constant-voltage current limiting. According to the lithium supplementing method for the lithium iron phosphate lithium ion battery, lithium can be supplemented to the positive electrode and the negative electrode at the same time, the overall first effect and cycle performance of the battery are improved, no non-conductive residues are generated, no extra special equipment is needed, operation is easy, and the cost is low.

The invention discloses a lithium ion battery and electrolyte thereof. The electrolyte comprises a nonaqueous organic solvent, lithium salts, and additives. The nonaqueous organic solvent contains a methyl ester compound (A). The additives comprise a polycyano compound (B) and a hydrocarbyl lithium phosphite compound (C). Compared with the prior art, through the cooperation among the methyl estercompound (A), the polycyano compound (B), and the hydrocarbyl lithium phosphite compound (C) in the electrolyte, the reactions between the solvent and the lithium are prevented, the overcharge performance and high temperature storage performance of the lithium ion battery are obviously improved, and the safety performance of the lithium ion battery is enhanced.

The invention relates to the field of energy storage materials, particularly to an electrolyte solution and a battery. The electrolyte solution of the invention comprises an organic solvent, an electrolyte and an additive, wherein the additive comprises a fluorophosphate compound and lithium sulfide. According to the electrolyte solution provided by the invention, the electrolyte solution comprises both fluorophosphate and lithium sulfide, so the high-voltage cycle performance, storage performance and overcharge performance of the battery can be remarkably improved.

The invention discloses a lithium-ion battery and an electrolyte thereof. The electrolyte comprises a non-aqueous organic solvent, lithium salt and additives, wherein the non-aqueous organic solvent contains a methyl ester compound A; the additives comprise an additive B--a silicon oxysulfide compound and an additive C which is at least one selected from the group consisting of an ether bond containing lithium disulfonate compound and an ether bond containing lithium disulfate compound; and the silicon oxysulfide compound is at least one selected from the group consisting of compounds as shownin a formula (I) which is described in the specification. Compared with the prior art, the lithium-ion battery and an electrolyte thereof provided by the invention have the following advantages: through synergistic effect of the methyl ester compound A, the additive B and the additive C, overcharge resistance and cycle performance of the lithium-ion battery can be improved, and the safety performance of the battery is improved.

A charge storage device (1) includes a sealed prismatic housing (2). Two opposed folded rectangular aluminium electrodes (3, 4) are disposed within housing (2) and connected to the electrodes. A porous, electronically insulating separator material, e.g. Solupor™, sheet separator (7) is disposed intermediate electrodes (3, 4) for maintaining those electrodes in a fixed spaced apart configuration. An electrolyte (not shown) is also disposed intermediate the electrodes. Collecting means in the form of a scavenging agent is grafted to separator (7) for sequestering one or more predetermined contaminants from the housing.

The invention provides an electrode sheet and an electrochemical energy storage device. The electrode sheet comprises a current collector and an active material layer. The electrode sheet further comprises a conductive coating. The conductive coating is arranged between the current collector and the active material layer and comprises a conductive polymer and a carbon-based conductive material. The conductive polymer is selected from complexes of polythiophene and polyanion. The electrode sheet provided by the invention can enable the electrochemical energy storage device to have relatively low initial internal resistance and have good kinetic properties; meanwhile, when the electrochemical energy storage device is abused, the safety performance of the electrochemical energy storage deviceis improved, and the thermal shock resistance and overcharge performance of the electrochemical energy storage device are improved; meanwhile, the electrochemical energy storage device further has good cycle performance and high-temperature storage performance.

The invention relates to a storage battery, especially relates to a battery with improved over charge performance of lithium ion battery. An anode comprises the following components by weight: 18-56% of ternary material, 37-72% of lithium manganate, 3-4% of polyvinylidene fluoride and 4-6% of conductive agent; a cathode comprises the following components by weight: 94-96% of graphite, 25-3% of aqueous binder, 0.5-1% of carboxymethylcellulose sodium and 1-2% of butadiene styrene rubber binder, in the prerequisite that the routine lithium ion battery has the cycle life, the safety performance and the low temperature performance, the battery 1C is charged to 10V at constant current and constant voltage, and when the cut-off current is 0.01C, the temperature rises to 101 DEG C, and if the duration of charging is more than or equal to 3 hours, and the battery does not generate smoke, leak, fire and explode, thereby effectively improving the over charge performance of the battery and safety performance of the ternary material lithium battery.

The invention relates to lithium battery electrolyte which is prepared from lithium salt, an organic solvent and additives. The additives include the additive S accounting for 0.1-10% of the total mass of the lithium battery electrolyte, the additive S is one or more of elements in the following structural formula (shown in the description), wherein R1-R5 are independently selected from H, halogen, nitryl, amino, cyano, alkyl substituted by the halogen or not substituted by the halogen, alkoxy substituted by the halogen or not substituted by the halogen, alkenyl substituted by the halogen or not substituted by the halogen, R6 represents alkyl, the halogen substituted by the halogen is F, Cl and Br, and the substitution performed by the halogen is partial or complete. The overcharge, charge and discharge performance of a lithium battery are all improved, side reaction is reduced, expansion of the battery under high temperature is decreased, and the cycle life of the battery under normal temperature, high temperature and low temperature is prolonged.

The invention provides an overcharge-resistant pole piece, a method for preparing the same, and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The overcharge-resistant pole piece includes an overcharge-resistant coating and a pole piece layer. The overcharge-resistant coating is disposed on both surfaces of the pole piece layer, and includes an overcharge-resistant material. The overcharge-resistant material includes one or more of the group consisting of silicon, oxide of silicon, oxide of tin, titanium dioxide, tungsten oxide, iron oxide, molybdenum oxide, cobalt oxide, copper oxide, and nickel oxide, and lithium titanate. The overcharge-resistant material can consume the lithium dendrites formed during an overcharge process to prevent the lithium dendrites from piercing a diaphragm and further from causing an internal short circuit. Further, the consumption of the lithium dendrite can reduce its side reaction with an electrolyte, thereby improving the battery's overcharge performance. The diaphragm shrinks under a heat abuse condition, and the overcharge-resistant coating on the positive and negative pole pieces can isolate the positive and negative electrodes, avoid internal short circuits, and improve the safety of a battery cell.

The invention provides an electrolyte solution for a lithium-ion secondary battery. The electrolyte solution comprises an ionogen, a solvent and an additive, wherein the additive is an oxidation-reduction pair additive and the solvent is an ionic liquid. The invention also provides the lithium-ion secondary battery. The lithium-ion secondary battery manufactured by the electrolyte solution provided by the invention has good elevated temperature property, overcharging property, storage property at high temperature, discharge property at low temperature, rate discharge property and good cycle property of the assembled battery, particularly improving the safety property of the battery remarkably. Additionally, the uniformity of each single battery and the safety property of each single battery and the battery pack are obviously improved during the charge and discharge process of the assembled battery.