56results about How to "Improve anti-overcharge performance" patented technology

The anode material is prepared from oxidation material layer of covering surface of at least one anode active material among LiCoO2, LiNi1-xCOxO2, LiNi1/3Mn1/3O2 and LiMn2O4. Weight of non-oxygen element in oxidation material layer can be 0.01-10 weight% of anode active material. Advantages of the anode material are: good cycle performance, favorable high temp property and high power discharge property, and anti over change property as well as simple technique and easy of production.

A method for preparing the spinel lithium titanate belongs to the field of the battery. The aim of the invention is to provide a method for preparing the spinel lithium titanate. The essential point of the technical scheme of the invention is that the molecular formula of the spinel lithium titanate is LixTi1.25-yMyO3/wz according to the method for preparing the spinel lithium titanate. The method for preparing comprises the following steps: (1) after mixing a lithium source and a titanium source with the atomic ratio between lithium and titanium for 0.6-1 into an organic solvent for executing ball milling for 8-24 hours, drying; (2) executing heat treatment to the dried object prepared in the step (1) at the temperature of 300-600 DEG C for 10-24 hours, cooling by radiation; and (3) mixing and executing ball milling to the material obtained in the step (2) and the coating material for 8-24 hours, and after sintering under the protection of nitrogen in the temperature of 700-1000 DEG C for 10-24 hours, cooling and sieving for obtaining the spinel lithium titanate of the invention. The method of the invention is used for preparing the lithium cell.

The invention discloses an additive used in the nonaqueous electrolyte of a Li-ion battery for achieving good circle performance, safety performance and low-temperature performance of the Li-ion battery. The additive is a silane compound represented by formula (1): R1R2R3Si(OCH2CH2)nOCH3. The invention also discloses a nonaqueous electrolyte containing the additive. The nonaqueous electrolyte contains a Li salt, a nonaqueous organic solvent, and the silane compound represented by formula (1), wherein the silane compound accounts for 0.1 to 0.3 v/v% the nonaqueous organic solvent. The nonaqueous electrolyte in the Li-ion battery can form a dense and stable solid electrolyte interface membrane on the surface of negative electrodes, such as graphite so as to maximally suppress the decomposition of the electrolyte, thereby improving the charge/discharge efficiency and the circle property of the Li-ion battery.

The invention relates to a separator for use in a nonaqueous-electrolyte secondary battery, and a nonaqueous-electrolyte secondary battery employing the separator, the separator comprising a positive electrode and a negative electrode which are capable of occluding and releasing lithium, a separator, and a nonaqueous electrolytic solution comprising a nonaqueous solvent and an electrolyte, the separator for use in the battery having an electroconductive layer, the electroconductive layer having (1) an apparent volume resistivity of 1×10⁻⁴ Ω·cm to 1×10⁶ Ω·cm, or (2) a volume resistivity of 1×10⁻⁶ Ω·cm to 1×10⁶ Ω·cm, or (3) a surface electrical resistance of 1×10⁻²Ω to 1×10⁹Ω, and the electroconductive layer having a film thickness less than 5 μm. The invention further relates to.

The invention discloses an electrolyte for a lithium ion battery and a preparation method thereof. The electrolyte consists of a main electrolyte, an electrolyte additive, a main solvent and a solvent additive. The preparation method comprises the following steps of: A. under the condition of vacuum or inert gas protection, respectively mixing the main solvent and the solvent additive with a drying agent (lithium oxide) which is dried to be at constant weight in advance, and mixing and filtering to remove the lithium oxide and lithium hydroxide sediment; B. uniformly mixing the dried main solvent and the dried solvent additive from the step A; and C. adding a main electrolyte mixture and an electrolyte additive into the solvent mixed in the step B, and agitating and dissolving under the vacuum and inert gas protection to prepare a solution with the mass mol concentration of the main electrolyte of 0.5-1.5 M. The electrolyte has the advantages of abundant resources, low price and no toxin, effectively improves the work temperature range of the battery and effectively prolongs the circulating service life of the battery, so that various types of the lithium ion batteries are manufactured; and the electrolyte is particularly suitable for manufacturing a lithium ion power battery with high power capacity and high multiplying power charging and discharging capacity.

The invention relates to a new anode material with interlaminar doping Li(1-2beta)(AE) (beta)CoO2 (AEú¢Mgú¼Ca) by substituting lithium ion by alkaline-earth metal ion and opposite fused salt ion exchange reaction preparation method. Wherein, the preparation method comprises: preparing layer-shape LiCoO2 predecessor with little and even size with citrate sol-gel method; substituting part lithium ion with Mg2+ or Ca2+ by fused salt ion exchange reaction; baking to distribute lithium ion and alkaline-earth metal ion evenly in main body layer constructed by CoO2. This product has more stable structure, better anti-overcharge performance, higher specific capacity and super electrochemical circulation property.

The invention discloses a lithium ion cell of a compound cathode material. A polar plate unit consists of an anode, a spacing membrane and a cathode; the anode is sealed in the bag of the spacing membrane; the cathode comprises the compound material of lithium titanate and black lead. The bag of the spacing membrane provided with the anode and the cathode are spaced by another layer of spacing membrane; an 'S'-shaped lamination mode is adopted; or the bag of a double-layer spacing membrane provided with the anode and the cathode are directly overlapped. The width of the cathode is equal to the width of the bag of the spacing membrane. The cathode comprises the following material components as per weight percentage: 80 to 87 portions of the compound material of lithium titanate and black lead, 4 to 7 portions of adhesive, 6 to 7 portions of conductive agent as well as 3 to 6 portions of liquid imbibing agent. The compound material of lithium titanate and black lead comprises the following components as per weight percentage: 85 to 90 portions of lithium titanate as well as 10 to 15 portions of black lead. The compound material of lithium titanate and black lead is manufactured by a mechanical alloy method. The lithium ion cell of a compound cathode material has simple structure, is easy to be processed and manufactured, is safer and is suitable for electric motor cars and special power sources.

The invention discloses a lithium ion batteries cathode material and a preparation method thereof, and more specifically relates to the lithium ion batteries cathode material coated by orthosilicate and the preparation method thereof. A coating layer comprises the chemical composition of Li1+aMnbMcSiO4(M=Co, Ni, Fe, Mg, Al, Ti, Zr, and a is greater than or equal to -0.1 and less than or equal to 0.1, b is greater than 0 and less than or equal to 1.0, c is greater than or equal to 0 and less than or equal to 1.0). The cathode material has good overcharge resistance performance and thermostability. The preparation method is characterized in that orthosilicate and a salting liquid containing Mn(and M) are mixed to form sol, then a cathode material core is added, an orthosilicate coating layer containing Mn(and M) is formed on at least part of the surface of the cathode material core, and the lithium ion batteries cathode material can be obtained after heat treatment.

The invention relates to an electrochemical device and an electronic device, and specifically provides an electrochemical device, which comprises a positive electrode, a negative electrode and an electrolytic solution, wherein the negative electrode comprises a negative electrode current collector and a negative electrode active material layer formed on the negative electrode current collector, the negative electrode active material layer containing a negative electrode active material, a conductive material is provided between the negative electrode active material layer and the negative electrode current collector, an average particle diameter of the conductive material is smaller than an average particle diameter of the negative electrode active material, and the negative electrode active material layer has a specific weight. The electrochemical device provided by the invention has improved high-temperature cycle expansion performance and overcharge resistance.

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 discloses a lithium ion battery electrolyte. The electrolyte comprises electrolyte lithium salt, non-aqueous organic solvent and additive, wherein a major constituent of the additive isbenzene-containing sulfide, the benzene-containing sulfide specifically is at least one or more of phenyl vinyl sulfone, methyl benzenesulfinate, ethyl benzenesulfonate and methyl benzenesulfonate, mass of the additive is 0.1-10.0% of total mass of the electrolyte. The additive used in the electrolyte provided by the invention contains an aromatic nucleus and a sulfur-containing functional group,a special conjugated system of a benzene ring is liable to generate electric polymerization and consequently produces an insulating polymer film, thus, overcharging resisting performance of the lithium ion battery can be improved; the sulfur-containing functional group is beneficial for improving transmission rate of lithium ions between positive electrode interfacial films and reducing interfaceimpedance of the lithium ion battery. By modifying the positive electrode interfacial films with such additive, circulating performance and overcharging resisting performance of a high-voltage seriespositive electrode material can be promoted effectively.

The invention belongs to the field of lithium battery materials and particularly discloses a composite thermistor material. The composite thermistor material is characterized by comprising a fullerenematerial, a PTC material and an assistant. The invention further provides a thermistor compounded with the composite thermistor material, a thermosensitive lug assembled by the thermistor and a lithium-ion battery assembled by the thermosensitive lug. The inventor accidentally finds that the performance can be collaboratively improved through combined use of the fullerene material and the PTC material through a large number of studies. The lithium-ion battery with excellent overcharge resistance can be obtained through applying the lug provided by the invention into assembly of the lithium-ion battery; and especially a PTC thermistor containing the fullerene material is added between lugs of a soft package battery, so that the internal resistance of the whole battery can be reduced through reducing the room-temperature internal resistance rate of a PTC, and the overcharge performance of the soft package lithium-ion battery can be effectively improved to enhance the safety performanceof the battery.

The invention discloses an anti-overcharge battery pack device, which comprises a battery box and a battery management system, wherein the battery box is electrically connected with the battery management system, the battery box comprises a plurality of single batteries, the battery management system acquires state information of the battery box in real time and controls charging and discharging of the battery box according to the state information, and an anti-overcharging additive is added into electrolyte of the single batteries. According to the anti-overcharge battery pack device, the overcharge safety of the battery pack device is ensured from multiple aspects of electrolyte components of the single batteries, functions of a battery management system and the like, and fire and explosion during overcharge of one or more single batteries are prevented.

The invention relates to an electrochemical device and an electronic device, and specifically provides an electrochemical device, which comprises a positive electrode, a negative electrode and an electrolytic solution, wherein the negative electrode comprises a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector, the negative electrode current collector contains tin, and the electrolytic solution comprises a compound containing a sulfur-oxygen double bond. The electrochemical device provided by the invention has improved high-temperature cycle performance and anti-overcharge performance.

The present invention relates to a hydrogen storage alloy, an electrode for a Ni-MH battery, a secondary battery, and a method for preparing the hydrogen storage alloy. The chemical composition of the hydrogen storage alloy is expressed by the general formula La_(3.0˜3.2)xCe_xZr_ySm_{(1−(4.11˜4.2)x−y)}Ni_zCo_uMn_vAl_w, where x, y, z, u, v, w are molar ratios, and 0.14≤x≤0.17, 0.02≤y≤0.03, 4.60≤z+u+v+w≤5.33, 0.10≤u≤0.20, 0.25≤v≤0.30, and 0.30≤w≤0.40. The atomic ratio of the metal lanthanum (La) to the metal cerium (Ce) is fixed at 3.0 to 3.2, which satisfies the requirements of the overcharge performance of the electrode material. A side elements are largely substituted by samarium (Sin) element, that is, the atomic ratio of Sin on the A side is 25.6% to 42%, so as to solve the problem of shortened cycle life caused by the small amount of cobalt (Co) atoms. The equilibrium pressure is adjusted by the change in the ratio of Sin to La and Ce to satisfy the requirements of the charge and discharge dynamic performance of the electrode material. The nucleation rate of the solidification process is improved by the addition of zirconium (Zr) to the A side at an atomic ratio of 2% to 3%. The Ni-MH battery negative-electrode material obtained from the hydrogen storage alloy has high overcharge resistance, and good high-rate discharge performance and cycle stability.

The invention aims at providing a lithium-ion power battery material. Spinel lithium titanate is adopted as a negative electrode; and the lithium-ion power battery material is high in discharge speed, good in overcharge resistance, excellent in heat stability and excellent in safety. A positive electrode of the lithium-ion power battery material comprises a main material, namely a lithium iron phosphate and lithium vanadium phosphate composite material; a positive electrode material and a negative electrode material can be used cooperatively; and the lithium-ion power battery material has the advantages of high current charge-discharge capability, extremely high safety and excellent circulating discharge performance, and is suitable for the field of electric automobiles.

The invention provides an electrolyte and a secondary battery. The electrolyte comprises an electrolyte salt, an organic solvent and additives, wherein the additives comprise a benzene single nitrilecompound, cyclic sulfate and fluoroethylene carbonate. When the electrolyte disclosed in the invention is applied to the secondary battery, the anti-overcharging performance of the secondary battery can be obviously improved; and meanwhile, the secondary battery also has relatively low cycle impedance and relatively high cycle capacity retention ratio.