94results about How to "Improve normal temperature cycle performance" patented technology

The invention discloses a lithium manganese oxide material and a preparation method thereof, in particular to a high-crystallinity lithium manganese oxide material and a preparation method thereof, wherein the high-crystallinity lithium manganese oxide material is used for coating a lithium ion battery. The lithium manganese oxide material is obtained by being coated on a lithium manganese oxide precursor with the one-time crystal particle of 0.01-20mum and has the general formula of LiaMn2-b-cMbGcO4-d-eXdZe, wherein M and X are doped elements, G and Z are coating elements of which the concentration is distributed in a decreasing gradient from outside to inside, a is not less than 0.9 and is not more than 1.2, b is not less than 0 and is not more than 0.2, c is more than 0 and is not more than 0.2, d is not less than 0 and is not more than 0.2, and e is not less than 0 and is not more than 0.2. The material serves as the positive pole material of the lithium ion battery, has better normal-temperature and high-temperature cycle performance and excellent high-temperature storage performance, is simple in preparation and easy to operate, control and carry out industrial production.

The invention discloses a lithium ion power battery non-water electrolyte. The lithium ion power battery non-water electrolyte is prepared from, by weight, 100 parts of solvents, common lithium salts, 0.2-10 parts of anode film formation additives, 0.2-10 parts of circulation improvement additives and 0.01-0.5 part of acid and water removal additives. The solvents are cyclic carbonic ester and/or chain carbonic ester, and the molar concentration of the common salts in the solvents is 0.8-1.5 mol/L. Due to the combination use of the anode film formation additives, the circulation improvement additives and the acid and water removal additives, during first formation, a CEI film can be formed on the surface of an anode, the stability of a cathode SEI film can be improved, and the normal temperature circulation performance, the high-temperature 45 DEG C circulation performance and the high-temperature storage performance of a power battery can be remarkably improved.

The invention belongs to the technical field of lithium ion batteries and particularly relates to electrolyte for a lithium ion battery with a nickel-based cathode. The electrolyte comprises non-aqueous organic solvent, lithium salt, boron-containing lithium salt additive, cyclic ether compound and cyclic phosphonitrile compound. The cyclic phosphonitrile compound is hexaphenoxycyclotriphosphazene or cyclic phosphonitrile derivative. Compared with the prior art, the electrolyte is provided with the boron-containing lithium salt additive capable of improving high temperature performance of the lithium ion secondary battery with nickel-based cathode material, the cyclic phosphonitrile compound, and the cyclic ether compound, and the addition of the cyclic phosphonitrile compound and the cyclic ether compound enables the battery to be fine in high temperature performance, low temperature performance and cycle performance. In addition, the invention discloses the lithium ion battery comprising the electrolyte.

The invention discloses a low temperature type lithium ion battery electrolyte with high temperature property and lithium ion battery. The electrolyte is made by uniformly mixing and confecting electrolytic salt, non-water organic solvent, alkali additive and film-forming additive, the electrolytic salt is mixed lithium salt made by uniformly mixing lithium tetrafluoroborate and lithium bis(oxalate)borate, and the mol ratio of the two is 96-73: 4-27, the concentration of the mixed lithium salt solution formed by the electrolytic salt and the non-water organic solvent is 0.8-1.2mol/L; the alkali additive is heptamethyldisilazane and the mass ratio of the hepatmethyldisilazane and the non-water organic solvent is 0.1-8%; the mass ratio of the film-forming additive and the non-water organic solvent is 0.1-5%; and the lithium ion battery comprises an anode, a cathode, a diaphragm and low temperature type lithium ion battery electrolyte with high temperature property. The invention has reasonable design, simple preparation method steps and convenient implementation, and the prepared electrolyte and lithium ion battery have favourable comprehensive performances.

The invention relates to a kind of preparation craft of anode material of lithium ion battery: keep temperature in the stove equal through entering pump to make it into microcirculation; the anode material of lithium manganese oxide is made by agglomeration for two times; the characteristic of this craft is that, goes into the first agglomeration under the state short of lithium, enter air or oxygen through microcirculation during agglomeration; mix surplus lithium salts and outcome of ball milling for the first agglomeration equally, goes into agglomeration for second time to get lithium manganese oxide which is anode material of lithium ion battery. The invention improves reversibility of circulation and capability of high temperature of the anode material of lithium ion battery effectively and influence charge discharge capacity little. The craft of the invention is simple and practical, the cost is low and it is propitious to industrial production of scale. Lithium ion battery material made by this method can apply to field broadly such as mobile telephone, notebook computer,minitype of video recorder electromotion cars broadly and so on.

The invention relates to an electrode material surface coating method and application thereof. The method includes the steps that an electrode material and lithium hydrate are mixed; then TiO2 and/or Al2O3 are added into the obtained mixture and continue to be mixed; the obtained mixture is sintered at the first temperature and heated to the second higher temperature to be sintered to obtain the electrode material coated with an oxide layer, wherein the second temperature is higher than or equal to the first temperature, and the first temperature is higher than or equal to 400 DEG C. The method is easy to operate and suitable for large-scale production, and a coating layer of a prepared product is complete and even. A battery made of the electrode material coated with the oxide layer is excellent in circulating performance and high temperature performance and good in safety performance, the 500-cycle capacity retention ratio at the normal temperature is 93.5% or more, and the 500-cycle capacity retention ratio at the high temperature is 89.2% or more.

The invention discloses a preparation method of a lithium manganate material. The method dislcosed by the invention comprises the following step: uniformly mixing lithium sources and manganese sources in a mole ratio, sending the mixture into a cabinet resistance furnace to sinter at a high temperature, cooling the mixture to room temperature to obtain the lithium manganate material. The method for preparing a battery from the lithium manganate material is characterized by comprising the following steps: ball milling and mixing the lithium manganate material and a chemically purified carbon nano-tube to obtain a composite material of lithium manganate and carbon nano-tube, wherein the composite material of lithium manganate and carbon nano-tube is used as a positive electrode active substance and a mixture of conductive carbon black and KS-6 is used as a conductive agent, modified intermediate-phase carbon microspheres are used as negative electrode active substances and conductive carbon black is used as a conductive agent; and pulping by a dry powder blender and a high-speed mixer.

The invention relates to the field of lithium ion batteries, and discloses a separating membrane used for a lithium ion battery. The separating membrane includes a polymer substrate and a lithium titanate layer formed on one side of the polymer substrate. A preparing method of the separating membrane used for the lithium ion battery and the lithium ion battery comprising the separating membrane are also disclosed. Compared with a mixed anode, through adopting the lithium titanate layer of the separating membrane as an anode separating membrane of the lithium ion battery, a problem that heterogeneous compatibility of lithium titanate and graphite is difficult in a mixing process is overcome, anode material mixing processes are simplified and electrode sheet homogeneity is not influenced. The polymer substrate is coated with the lithium titanate, and the side coated with the lithium titanate layer is adhered to a graphite cathode, thus achieving functions of mixed anodes and further improving transient rate charging performance, low-temperature charging performance and room-temperature cyclic performance.

The invention discloses a high-voltage lithium-ion battery with a Si/C composite anode. The high-voltage lithium-ion battery comprises a cathode, an anode as well as a separator and a non-aqueous electrolyte placed between the cathode and the anode, wherein the active substance of the cathode is lithium transition metal oxide; the active substance of the anode is a Si-based substance; the separator is a ceramic separator; the non-aqueous electrolyte comprises a non-aqueous organic solvent, lithium salt and an additive, the additive comprises FEC (fluoroethylene carbonate) and isocyanurate compounds in the mass ratio being (6-36):1. Compared with the prior art, the lithium-ion battery using the electrolyte has excellent normal-temperature cycle performance, high-temperature cycle performance and high-temperature storage life, and the gas output in the high-temperature storage process can be remarkably reduced.

The invention discloses an electrolyte for a lithium iron phosphate lithium-ion battery. The electrolyte is prepared by uniformly mixing an electrolyte lithium salt and a non-aqueous organic solvent; the electrolyte lithium salt is a mixed lithium salt prepared by uniformly mixing lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium bis(oxalate)borate (LiBOB) according to a molar ratio of 95-75%:5-25%; the concentration of the mixed lithium salt solution consisting of the electrolyte lithium salt and the non-aqueous organic solvent is 0.8-1.3 mol/L; and the non-aqueous organic solvent is prepared by uniformly mixing a conventional substrate solvent and a low-melting-point solvent with a volume percent ratio of 10%-50%:90%-50%. The electrolyte provided by the invention has a wider temperature window, better charging and discharging performances and good cycling stability, and is capable of giving consideration to high-temperature performances and low-temperature performances of the lithium iron phosphate lithium-ion battery.

The invention relates to a non-aqueous electrolyte which comprises an organic solvent, lithium salt and an additive, wherein the additive comprises an additive A, and the mass of the additive A accounts for 0.05%-5% of that of the non-aqueous electrolyte; the structural formula of the additive A is as follows: R1 represents the formula, R5 and R6 are independently selected from one of hydrogen, alkyl, alkoxy, phenyl, phenoxyl, halogen, halogen alkyl, halogen alkoxy, halogen phenyl and halogen phenoxyl, and n is an integer ranging from 1 to 10; and R2, R3 and R4 are independently selected from one of hydrogen, alkyl, alkoxy, phenyl, phenoxyl, halogen, halogen alkyl, halogen alkoxy, halogen phenyl and halogen phenoxyl, and halogen is fluorine, chlorine or bromine. The additive A is added into electrolyte, so that the high-temperature and normal-temperature cycling performance of a lithium ion battery are improved.

The invention provides a lithium ion secondary battery and a diaphragm thereof. The diaphragm of the lithium ion secondary battery comprises a polymer base material, wherein the surface of the polymer base material contains a compound with an onium salt structure. The lithium ion secondary battery comprises a positive electrode plate, a negative electrode plate, the diaphragm for isolating the positive electrode plate from the negative electrode plate, and electrolyte, wherein the diaphragm is a diaphragm of the lithium ion secondary battery. The diaphragm has the high ionic conductivity and the high electrolyte absorption volume; the lithium ion secondary battery has the good rate capability and the good normal-temperature cycling performance.

The invention belongs to the technical field of lithium ion batteries, and relates to a high-voltage ternary lithium ion battery electrolyte. The high-voltage ternary lithium ion battery electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, and the additive contains vinylene carbonate, 1, 3-propane sultone and fluoroethylene carbonate and also comprises a combinationof a phosphate compound A, a sulfonate compound B and a sulphurous acid compound C. Compared with the prior art, through the synergistic effect of the compounds A, B and C, the electrolyte disclosedby the invention not only can improve the high-temperature performance of the lithium ion battery under high voltage, but also greatly improves the cycle performance and low-temperature performance ofthe battery. In addition, the invention also provides a high-voltage ternary lithium ion battery using the electrolyte.

The invention provides a lithium ion secondary battery and an electrolyte thereof. The electrolyte of the lithium ion secondary battery comprises lithium salt, a nonaqueous organic solvent and an additive. The additive comprises a diisocyanate compound, containing ether bonds, which is of a formula 1 structure and/or a formula 2 structure; in the formula 1, m, n and p are integers of 1 to 4 respectively; in the formula 2, x and y are integers of 1 to 4 respectively; and the weight percentage content of the diisocyanate compound, containing ether bonds, which is of the formula 1 structure and/or the formula 2 structure in the electrode of the lithium ion secondary battery is 0.1% to 2.5%. The lithium ion secondary battery comprises a positive plate, a negative plate, an isolating membrane arranged between the positive plate and the negative plate at an interval, and the electrode. The lithium ion secondary battery provided by the invention has high high-temperature storage performance, normal-temperature cycle performance and high-temperature cycle performance under high voltage.

The invention provides ternary high-nickel electrolyte and a high-nickel anode lithium ion battery containing the electrolyte. The ternary high-nickel electrolyte is characterized by comprising, by weight, 13-15% of lithium salt, 80-85% of a non-aqueous organic solvent and 0.1-5% of an additive; wherein the additive comprises vinylene sulfate, vinylene carbonate, succinonitrile, tris (trimethyl silicon-based) phosphorus, lithium bifluroflavin imide and lithium dioxalate borate; the lithium salt is lithium hexafluorophosphate; the non-aqueous organic solvent comprises a cyclic carbonate compound, dimethyl carbonate and ethoxy pentafluoro tripolyphosphate; the high-nickel anode lithium ion battery containing the ternary high-nickel electrolyte adopts anode slurry prepared from high-nickel ternary anode powder, a conductive agent, a functional composite binder, a solvent N-methyl pyrrolidone to prepare the anode membrane, the high-nickel anode lithium ion battery has excellent normal-temperature cycle performance, high-temperature cycle performance and high-temperature storage service life, and can obviously reduce the gas yield in the high-temperature storage process.

The invention discloses a non-aqueous lithium-ion battery electrolyte and a lithium ion battery. The non-aqueous lithium-ion battery electrolyte contains electrolyte salt, a non-aqueous organic solvent and a functional additive, wherein the functional additive is selected from one or combination of multiple compounds with chemical formulae of (K)(m+4)P(m+2)O(3m+7), (L)(n/2+2)P(n+2)O(3n+7) and (K)s(PO3)s, K is an alkali metal element selected from a first main group except hydrogen; L is an alkali metal element selected from a second main group except beryllium in the periodic table of elements; (K)(m+4)P(m+2)O(3m+7) contains an anionic group P(m+2)O(3m+7)<(m+4)->, and m is 0 or a positive integer; (L)(n/2+2)P(n+2)O(3n+7) contains an anionic group P(n+2)O(3n+7)<(n+4)->, and n is 0 or a positive even number; (K)s(PO3)s contains an anionic group (PO3)s<s->, and s is 3 or an integer larger than 3. During first formation of a battery prepared from the non-aqueous lithium-ion battery electrolyte, a dense and uniform SEI film with high lithium ion conductivity can be formed, so that first charge-discharge efficiency of the battery is improved, and normal-temperature cycling performance, rate capability, high-temperature cycling performance, high-temperature storage performance and low-temperature discharge performance of the battery are improved.

The invention discloses a lithium ion battery with uniform and stable current density. The lithium ion battery comprises a positive pole piece, a negative pole piece, and a diaphragm and electrolyte arranged between the positive pole piece and the negative pole piece; a positive pole comprises positive pole fluid, lithium iron phosphate particles, a conductive agent and a positive pole bonding agent; a negative pole comprises negative pole active materials, a negative pole bonding agent, a preservative, a thickening agent and de-ionized water. According to the lithium ion battery with the uniform and stable current density, the conductivity of the pole pieces is improved, the resistance of the battery is reduced and the electric conductivity of the pole pieces in a unit area is improved; the stability is placing negative pole slurry of the lithium ion battery for a long time is improved.

The invention relates to the field of lithium ion batteries, and discloses an additive used for a lithium ion battery electrolyte and the electrolyte and the lithium ion battery, wherein the additivecontains an additive a, an additive b and an additive c; the structural formula of the additive a is as shown in structural formula 1; the additive b is at least one of lithium difluorophosphate, lithium difluoroborate and lithium difluorosulfonimide; the additive c is at least one of vinylene carbonate, 1, 3-propane sultone, fluoroethylene carbonate, vinyl vinyl carbonate, glycol sulfite, vinylidene sulfate, propylene sulfite, dimethyl sulfate and trimethylene Sulfite. The additive is mixed by several mixtures, and is applied to the lithium ion battery electrolyte; the electrolyte has excellent overcharge performance, and is excellent in flame retardant property; furthermore, the lithium ion battery using the electrolyte has very small internal resistance and K value, and has relatively good normal temperature circulating performance and high temperature storage property.

The invention discloses a temperature-sensitive combination electrode. The temperature-sensitive combination electrode comprises an electrode active material, a temperature sensitive material and an adhesive, wherein the temperature sensitive material has dual effects of an electrode conducting agent and a temperature sensitive characteristic. At a normal operating temperature, the prepared temperature-sensitive electrode has high electrical conductivity, and electrochemical performance of the temperature-sensitive electrode is basically consistent with that of a conventional electrode; at a high temperature exceeding 100 DEG C, resistance and electrical conductivity of the temperature-sensitive combination electrode suddenly rise by more than three order of magnitudes, so that electrochemical capacity is suddenly decreased, and the thermal shutdown characteristic occurs; therefore, thermal runaway is inhibited, and the safety of a battery under misuse conditions such as overcharge, overheating and mechanical short circuit is improved. In addition, the temperature-sensitive combination electrode disclosed by the invention has the characteristics of being simple in preparation process, completely compatible with the conventional pole piece and battery manufacturing process, and the like.

The invention provides a phosphite ester stabilizer applicable to a non-aqueous electrolyte and the non-aqueous electrolyte comprising the stabilizer. The non-aqueous electrolyte comprises lithium salt, carbonic ester organic solvents, conventional additives and the phosphite ester stabilizer; the addition amount of the phosphite ester stabilizer in the non-aqueous electrolyte is 100ppm-1000ppm.

The invention discloses a lithium ion battery non-aqueous electrolytic solution, which comprises an electrolyte lithium salt, a non-aqueous organic solvent and a film-forming additive, wherein the film-forming additive comprises at least two of tetravinyl silane, tris (trimethylsilane) phosphate and a conventional additive. The invention also discloses a lithium ion battery containing the non-aqueous electrolytic solution of the lithium ion battery. According to the invention, the tetravinyl silane additive has a high HOMO energy level, and can form a passivation film (the oxygenolysis potential is 4.15 V vs Li/Li<+>) on a positive electrode interface prior to a solvent after battery capacity grading is finished, so that other components in the electrolytic solution are prevented from oxygenolysis on the positive electrode interface under high voltage, and the formed passivation film has better thermal stability; and the tris (trimethylsilane) phosphate has the characteristic of reducing the impedance of an interfacial film of the battery, and the combination of the high and low impedance additives can better improve the high and low temperature performance, the rate capability and the storage performance of the battery.

The invention relates to the technical field of energy storage, and provides a lithium ion battery electrolyte and preparation thereof. A composite lithium salt is dissolved in an organic solvent, the composite lithium salt comprises a lithium salt additive and lithium hexafluorophosphate, and the molar concentration of final lithium ions is 0.8-2.5 mol/L when the composite lithium salt is dissolved in an electrolyte solvent. The bis (trifluoromethylsulfonyl) lithium imide obviously improves the low-temperature performance and the high-temperature performance of the battery, and the bis (trifluoromethylsulfonyl) lithium imide is used as a main lithium salt additive and is matched with lithium hexafluorophosphate, so that the ionic conductivity of the electrolyte can be further improved, the component proportion of an SEI film can be improved, the conduction of Li<+> is facilitated. The positive electrode structure is stabilized, and the dissolution of transition metal ions is inhibited, so that the rate capability and the cycle performance of the lithium ion battery are improved. The invention also provides an electric vehicle with the lithium ion battery.

The invention provides an electrolyte and a secondary battery. The electrolyte comprises an electrolyte salt, an organic solvent and an additive. The additive comprises a cyclotriphosphazene compoundand vinyl ethylene carbonate. When the electrolyte is applied to a secondary battery, the normal temperature cycle performance, high temperature storage performance and high temperature thermal stability of the secondary battery can be improved simultaneously.