10results about How to "Improve normal temperature cycle performance" patented technology

The invention relates to an amido eutectic electrolyte, a preparation method thereof and a lithium metal secondary battery, and belongs to the technical field of lithium metal secondary batteries. The amido eutectic electrolyte comprises a lithium salt, an organic solvent and an amido eutectic solvent, the amido eutectic solvent comprises an amido compound as shown in a structural formula (I). In the amido eutectic electrolyte disclosed by the invention, the amido eutectic solvent shown in the structural formula (I) can generate eutectic action with the organic solvent, and the formed hydrogen bond greatly improves the cluster oxidation resistance, so that the anode of the lithium metal secondary battery can be stabilized, and CEI rich in Li3N is formed; and the introduction of the amide-based solvent can solubilize a small amount of lithium salt, so that the formation of stable SEI on the negative electrode side of the lithium metal secondary battery by the amide-based eutectic electrolyte is facilitated, and the lithium metal secondary battery has relatively good normal-temperature cycle performance and high-temperature cycle performance under high voltage.

The invention provides a secondary battery. The secondary battery comprises a negative pole piece and an electrolyte, the negative pole piece comprises a silicon-based negative pole material; the electrolyte comprises a first additive and a second additive; the first additive comprises fluoroethylene carbonate; and the second additive comprises a compound as shown in formula I: # imgabs0 #. The secondary battery disclosed by the invention adopts a silicon-based negative electrode material and has a compact and stable interfacial film, so that the side reaction of the battery is reduced, and the normal-temperature cycle performance, the high-temperature cycle performance, the high-temperature storage performance and the low-temperature discharge performance of the battery are improved.

The invention relates to the technical field of lithium ion batteries, in particular to a high-entropy electrolyte, a preparation method thereof and a lithium ion battery. The invention provides a high-entropy electrolyte. The high-entropy electrolyte comprises a lithium salt, an organic solvent and an additive, the types of the organic solvents are more than or equal to 6, and the mass of each organic solvent accounts for more than 6% of the total mass of the organic solvents; the types of the lithium salts are greater than or equal to 2, and the mass of each lithium salt accounts for more than 20% of the total mass of the lithium salts. According to the high-entropy electrolyte disclosed by the invention, the low-temperature performance of the electrolyte is improved, and meanwhile, other performances such as normal-temperature cycle performance and high-temperature cycle performance can be considered by improving the confusion degree of the organic solvent and the lithium salt, increasing the entropy value of the electrolyte and adjusting the solvation structure of lithium ions; the high-entropy electrolyte is used in the lithium ion battery, so that the lithium ion battery has excellent low-temperature DCR, low-temperature discharge performance, normal-temperature cycle performance and high-temperature cycle performance.

The invention relates to a secondary battery and an apparatus. The secondary battery comprises a positive pole piece, a negative pole piece and an electrolyte, the electrolyte comprises a solvent and a lithium salt, the solvent comprises non-fluorinated linear carbonic ester, fluorinated carbonic ester and a cyclic sulfone compound, the mass percentage content of the cyclic sulfone compound in the solvent is A%, the mass percentage content of the fluorinated carbonic ester in the solvent is B%, the mass percentage content of the lithium salt in the solvent is A%, and the mass percentage content of the lithium salt in the solvent is A%. 0.05 < = A / B < = 2; the negative pole piece comprises a negative active material selected from a silicon-based material, the mass percentage content of the silicon-based material in the negative active material is C%, and C / A is greater than or equal to 2 and less than or equal to 18. The electrolyte can effectively improve the high-temperature gas production problem of the silicon-based negative electrode secondary battery, improve the thermal runaway temperature of the battery, reduce the thermal runaway damage of the battery, and ensure the excellent normal-temperature cycle performance and high-temperature cycle performance of the battery.

The invention provides an electrolyte additive combination, an electrolyte for an electrochemical energy storage unit and application of the electrolyte. And the electrolyte additive combination comprises a mono-cyano compound and a tricyano compound. The mono-cyano compound is selected from an additive A and / or an additive B. Cyano groups and phosphate groups in the additive A or the additive B are complexed with positive metal ions, so that the positive electrode can be effectively protected, and a phosphorus compound protective film is formed on the negative electrode. Cyano groups in the tricyanogroup compound and positive electrode metal ions have a complexing effect, so that the positive electrode can be effectively protected. The combination of the mono-cyano compound and the tricyano compound can play a synergistic role, so that the high-temperature storage performance and the high-temperature cycle performance of the battery can be effectively improved.

The invention provides an electrolyte, a battery containing the electrolyte, an energy storage device and electric equipment, the electrolyte comprises an electrolyte additive, the electrolyte additive comprises at least one of a compound shown in a formula (I) and a compound shown in a formula (II), and in the formula (I), the compound shown in the formula (I) is a compound shown in the formula (II). R1 and R2 are respectively and independently selected from substituted or unsubstituted methylene and substituted or unsubstituted imino, and R3 is selected from substituted or unsubstituted methylene; in the formula (II), R4, R5 and R6 are respectively and independently selected from substituted or unsubstituted methylene and substituted or unsubstituted imino, and R7 is selected from substituted or unsubstituted methine. # imgabs0 #

The invention discloses a non-aqueous electrolyte and a lithium ion battery, the non-aqueous electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, the additive comprises a compound A shown in a formula 1, # imgabs0 #, M is selected from O = S = O or C = O, and R is selected from CH2, CHF or CF2. The molecular radius of the compound A is large, the dissociation degree of lithium ions in the electrolyte can be improved, so that the conductivity of the electrolyte is improved, ohmic resistance in the battery is reduced due to improvement of the conductivity, heat generated in the charging and discharging process is reduced due to low ohmic resistance, and the service life of the battery is prolonged. Meanwhile, the high-conductivity electrolyte is also beneficial to improving the migration speed of lithium ions at a low temperature; importantly, the compound A can also participate in formation of a thinner, uniform and compact SEI film on the surface of the electrode, so that side reaction of electrolyte is inhibited, interfacial film impedance and potential difference polarization in the charge-discharge process are reduced, the transmission rate of lithium ions is improved, and the discharge performance of the battery under the low-temperature condition can be remarkably improved.

The application discloses a lithium ion battery, which comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, the negative electrode comprises a negative electrode material, the negative electrode material comprises a negative electrode active material and a coating layer, the coating layer comprises an ion-conducting material, and the inorganic component in the coating layer accounts for greater than or equal to 80 wt%; the electrolyte comprises a non-aqueous organic solvent and a lithium salt, the non-aqueous organic solvent comprises a solvent with high dielectric constant and low viscosity and ethylene carbonate, the volume fraction of the solvent with high dielectric constant and low viscosity in the non-aqueous organic solvent is greater than or equal to 10%, and the volume fraction of the ethylene carbonate in the non-aqueous organic solvent is less than or equal to 10%; and the concentration of lithium bisfluorosulfonylimide and / or lithium bis(trifluoromethylsulfonyl)imide in the lithium salt is less than or equal to 0.1 mol / L. By matching the negative electrode material with the specific type of coating layer and the electrolyte with the specific composition, the lithium ion battery has good fast-charging performance, and the risk of explosion and fire during thermal runaway of the battery is reduced.

The invention relates to a lithium battery electrolyte and a lithium ion battery, and mainly solves the problems of poor normal-temperature cycle performance, high-temperature shelving gas production and low low-temperature discharge efficiency of the lithium ion battery. The electrolyte comprises a solvent, a lithium salt and an additive, the additive comprises a phosphorus-containing additive, and the phosphorus-containing additive is one or more of compounds shown in a general formula (1), in the general formula (1), # imgabs 0 # R1, R2, R3 and R4 are independently alkyl, fluoroalkyl, alkoxy, fluoroalkoxy, alkenyl, fluoroalkenyl, alkenyloxy, fluoroalkenyloxy, alkynyl, fluoroalkynyl, aryl, aryloxy, cyano, silane, ether silicon group or amido, A represents a structural formula 1: # imgabs 1 # structural formula 2: # imgabs 2 # or a structural formula 3: # imgabs 3 # m > = 0, n > = 0, R5 represents H, F or alkyl, R6 represents O, S or = CxH2x, R7 represents-CxH2x-, and x > = 1. The invention well solves the common problems in the lithium ion battery, and can be used in the industrial production of the lithium battery.

The invention provides an electrolyte, a battery, an energy storage device and an energy storage system. The electrolyte provided by the embodiment of the invention comprises an electrolyte salt, an organic solvent and a first additive, wherein the first additive comprises an N-nitro derivative.