226results about How to "Improve low temperature performance" patented technology

The invention belongs to the technical field of road engineering materials, and discloses a wide-temperature-range crack pouring adhesive based on rubber modified asphalt and a preparation method thereof.The wide-temperature-range crack pouring adhesive is prepared by taking the rubber modified asphalt as a matrix through a response surface method and adding SBS, basalt fibers and a modifier. The performance of the material is tested through a conventional test, and meanwhile, a test with more characteristics in northeast regions is provided, and the performance of the material is detected through injection depth, viscosity, low-temperature stretching after aging and freeze-thaw cycle stretching. Results show that a test designed by a response surface method has very strong reliability, and the modified heating type crack pouring adhesive added with the basalt fiber can significantly improve the high and low temperature performance of the crack pouring adhesive, and also has good anti-aging performance and freeze-thaw cycle resistance. And the filling depth and the viscosity of the sealant are not obviously lower than those of the same type of sealant.

The embodiment of the utility model discloses a secondary battery and a battery pack, the secondary battery comprises an electrode roll formed by winding a first pole piece, a diaphragm and a second pole piece, and the diaphragm is arranged between the first pole piece and the second pole piece; one of the first pole piece and the second pole piece is a positive pole piece, the other one is a negative pole piece, the first pole piece comprises a first active layer, and the second pole piece comprises a second active layer; the electrode roll is provided with a flat part and bent parts located at the two opposite ends of the flat part, at least one of the first active layer and the second active layer is provided with a first groove located in the flat part, at least one of the first active layer and the second active layer is provided with a second groove located in the bent part, and notches of the first groove and the second groove located in the same active layer face the active layer of the adjacent pole piece; in the second direction, the size of the first groove is larger than that of the second groove. By adopting the structural design, the electrolyte infiltration time of the thick-coated pole piece can be shortened, the stress of the pole piece at the bending part can be reduced, and the low-temperature performance, the rate performance and the fast-charge cycle performance of the battery can be improved.

The invention relates to the technical field of lithium batteries, and provides a lithium ion secondary battery. The battery comprises a positive plate, a diaphragm and a negative plate which are laminated, the positive plate comprises lithium iron phosphate; the diaphragm is formed by a base film; the battery also comprises an electrolyte; the electrolyte comprises lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate; based on the total mass of the electrolyte, the mass ratio of the lithium bis (fluorosulfonyl) imide is recorded as L2, and the mass ratio of the lithium hexafluorophosphate is recorded as L1; l2 and L1 satisfy the following conditions: 0.1 < = L2 / L1 < = 4.6; the electrolyte comprises a linear organic solvent and an annular organic solvent; the linear organic solvent comprises linear carbonic ester and linear carboxylic ester, and the cyclic organic solvent comprises cyclic carbonic ester; the mass ratio of the linear organic solvent to the annular organic solvent is marked as W, and W is greater than or equal to 1; when the conditions are met, the high and low temperature performance and the safety performance of the battery can be effectively improved.

The present application belongs to the field of battery technology and specifically discloses a positive electrode material and a preparation method thereof, a lithium ion battery and an electric device. The positive electrode material satisfies: 1.5<Kn 90 =(Ln 90 ‑Ln 10 ) / Ln 50 <4.5;0<Ln 10 <2000Å;Ln 10 <Ln 50 <3000Å;Ln 50 <Ln 90 <15000Å. The positive electrode material has high capacity, good cycle retention rate and excellent low-temperature performance, and the preparation method is simple to operate and low in cost. Using it in the battery is beneficial to improving the comprehensive performance of the battery.

The invention discloses a polymer electrolyte, a preparation method and application. The polymer electrolyte provided by the invention comprises a polymer elastomer and a multi-element deep eutectic electrolyte, the multi-element deep eutectic electrolyte comprises a lithium salt, a hydrogen bond donor and an additive containing O = S = O groups, and the molar ratio of the lithium salt to the hydrogen bond donor to the additive containing the O = S = O groups is (5-20): (60-90): (2-20). The polymer electrolyte provided by the invention has good rate capability at room temperature and good charge-discharge cycle performance in a wide temperature range of-60 DEG C to 120 DEG C, and can be matched with a positive electrode material with higher working voltage, so that the energy density of a battery is remarkably improved.

The invention relates to the technical field of road materials, in particular to an asphalt raw material for SBS polymer modified asphalt and modified asphalt. The asphalt raw material for the SBS polymer modified asphalt comprises the following components in percentage by mass: 9-16% of saturate; 43%-53% of aromatic component; 22%-28% of colloid; 9%-12% of asphaltene; the penetration of the asphalt raw material for the SBS polymer modified asphalt at 25 DEG C is 63-750.1 mm; the dynamic viscosity at 60 DEG C is less than or equal to 240 Pa.s; the penetration ratio is greater than or equal to 65%; the instability index of the colloid is 0.2-0.4; the weight-average molecular weight of the asphalt raw material for the SBS polymer modified asphalt is 1400 to 2200 g / mol. By optimizing the raw material components of the asphalt, the produced modified asphalt has better high-temperature performance, low-temperature performance, anti-aging performance and storage stability, the production efficiency is improved, and the cost is reduced.

The invention discloses a water-based binder for a lithium ion battery as well as a preparation method and application of the water-based binder. The binder is obtained by polymerizing raw materials comprising the following components: a) 20wt%-45wt% of at least one of olefinic bond type unsaturated carboxylic acid or olefinic bond type unsaturated carboxylic acid anhydride; b) 20 wt% to 45 wt% of an ethylenic bond type unsaturated nitrile monomer; c) 5 wt%-30 wt% of an ethylenic bond type unsaturated hydrophilic monomer which does not contain carboxyl; d) 10 wt% to 40 wt% of an ethylenic bond type unsaturated hydrophobic monomer; and e) 0.15 wt%-1 wt% of a crosslinking monomer. The binder provided by the invention is applied to the field of lithium ion batteries, and can improve the processing performance of a negative pole piece and the cycle performance of the battery.

The invention provides a preparation method for in-situ generation of an organic-inorganic hybrid SEI layer in a zinc ion battery, which is characterized in that a polysaccharide / polyacrylamide dual-network hydrogel electrolyte is used as an electrolyte of the zinc ion battery, and is further assembled with a positive pole piece and a negative pole piece to form the zinc ion battery. And the zinc ion battery generates an organic-inorganic hybrid SEI layer on the negative electrode in situ in the charge-discharge cycle process. The invention also provides an application of the organic-inorganic hybrid SEI layer in a zinc ion battery. By means of the technical scheme, the organic-inorganic hybrid SEI layer generated on the surface of the zinc negative electrode in situ can inhibit growth of zinc dendrites, induce zinc to be evenly deposited and prevent zinc foil corrosion, the capacity retention ratio and coulombic efficiency of the battery are almost 100% after 3000 cycles under the condition of 5A / g, and the battery shows excellent electrochemical stability.

The invention discloses high-viscosity and high-elasticity modified asphalt and an asphalt composition, belongs to the field of asphalt, and solves the technical problem that the existing asphalt material lacks high-viscosity and high-elasticity modified asphalt suitable for diversified climates. The high-viscosity and high-elasticity modified asphalt suitable for diversified climates is prepared from the following raw materials in parts by mass: 100 parts of road petroleum asphalt, 2.5-4 parts of an epoxidized modified styrene-butadiene-styrene block copolymer, 5-10 parts of a hyperbranched polyester modified styrene-isoprene-styrene block copolymer, 5-10 parts of tackifying resin, 1-3 parts of a coupling agent, 1-3 parts of a coupling agent, 1-3 parts of a coupling agent, 1-3 parts of an antioxidant and 1-3 parts of a lubricant. The modified asphalt is prepared from, by weight, 1-2 parts of rubber powder, 1-2 parts of oleamide, 2-3 parts of bagasse fibers and 2-10 parts of other functional auxiliaries. The modified asphalt has the advantages of being high in viscosity and elasticity, suitable for various climates and the like.

The invention provides a springback-reducing admixture for sprayed concrete and a preparation method of the springback-reducing admixture, and relates to the technical field of concrete admixtures. The springback-reducing admixture for the sprayed concrete comprises the following raw materials in percentage by mass: 40-70% of a component A and 30-60% of a component B, the component A comprises the following raw materials in percentage by mass: 30%-50% of calcined kaolin, 10%-20% of light calcined magnesia and 40%-60% of semi-hydrated gypsum. And the component B comprises the following raw materials in percentage by mass: 60-90% of cement, 5-10% of modified rubber powder and 5-10% of cellulose. The springback-reducing admixture for sprayed concrete provided by the invention is applied to sprayed concrete and has relatively low springback rate and relatively high strength.

The invention discloses a gradient pore structure geopolymer asphalt mixture warm mixing agent which is composed of the following components in parts by weight: 65-85 parts of regenerated micro powder, 15-35 parts of rice hull ash, 15-20 parts of a sodium silicate solution, 5-10 parts of sodium hydroxide and 10-20 parts of deionized water. The invention also discloses a preparation method of the geopolymer asphalt mixture warm mixing agent. The geopolymer asphalt mixture warm-mixing agent has a gradient pore structure and has no closed pores or semi-closed pores, so that the water carrying capacity in the geopolymer asphalt mixture warm-mixing agent can be greatly improved, and the pore structure is arranged in a gradient manner (gradually released from large pores to small pores), so that the water release period of the warm-mixing agent can be effectively prolonged, and meanwhile, the water release rate can be uniform; compared with a hot-mixed asphalt mixture, the geopolymer asphalt warm-mixing agent with the gradient pore structure has the advantages that the mixing temperature of the asphalt mixture can be remarkably reduced, and meanwhile, the high and low temperature performance, the water damage resistance and the fatigue resistance of the asphalt mixture can be improved.

The invention provides a solid waste-emulsified asphalt cold recycled mixture and a preparation method thereof, and belongs to the technical field of road engineering materials. According to the invention, asphalt mixture reclaimed materials (RAP), new aggregates, mineral powder, a cementing material, water and emulsified asphalt are used as raw materials, wherein the cementing material adopts blast furnace slag powder and fly ash to replace part of cement. By improving the mixing process, the cold recycling mixture is mixed more uniformly, so that the asphalt film thickness distribution on the surfaces of different types of aggregates after demulsification of the emulsified asphalt is uniform; the macroscopic pavement performance such as volume parameters, mechanical strength, water stability, high-temperature performance and low-temperature performance of the blast furnace slag powder-fly ash-emulsified asphalt cold recycled mixture sample is effectively improved.

The EPDM composition is a rubber composition obtained by blending carbon black, a plasticizer and a cross-linking agent in an ethylene-propylene-diene ternary copolymer rubber, the plasticizer is a polyol ester, the polyol ester is a reaction product of a neopentyl polyol and a monocarboxylic acid, and the amount of the plasticizer in the composition is 5-22 wt%. The EPDM composition does not damage the mixing property and the processability, and the hardness change of the obtained cross-linked product after a thermal aging test is the same as that of the cross-linked product under the condition of matching the same parts of alpha-olefin oligomer, and is greatly improved compared with that of the cross-linked product under the condition of matching aliphatic dibasic acid ester.

The invention discloses a preparation method of a lithium ion battery electrolyte, and relates to the technical field of lithium ion battery electrolytes.The preparation method comprises the following steps that S1, single organic solvents, namely diethyl fluoromalonate, fluoroethylene carbonate and dimethyl carbonate are taken and mixed in proportion, and a mixed organic solvent is prepared; s2, preparing a composite lithium salt; and S3, the mixed organic solvent, the composite lithium salt and an additive are taken in proportion and mixed, the lithium ion battery electrolyte is prepared, and the additive is a sulfonate compound and a fluorine-containing sulfonamide compound. According to the invention, by adding the sulfonate compound and the fluorine-containing sulfonamide compound additive, a stable, uniform and thin interfacial film can be formed, the stability of CEI and SEI films can be improved, and the positive and negative electrode materials of the battery can be protected; and the freezing point of the organic solvent is reduced while the ionic conductivity under the high-temperature condition is improved, so that the low-temperature effect of the electrolyte is improved, and the lithium ion battery electrolyte has a wider temperature range.

The invention discloses a preparation method of a PVD (Physical Vapor Deposition) semiconductor reaction cavity water-cooling plate assembly and the water-cooling plate assembly, and relates to the technical field of semiconductor water-cooling plate preparation. The method comprises the steps that according to the size of a target base, an oxygen-free copper material is cut, then rough machining is conducted, and a base blank is obtained; cutting the oxygen-free copper material according to the size of the target cover plate, and performing rough machining to obtain a cover plate blank; performing heat treatment on the cover plate blank to obtain a heat-treated cover plate blank; after a base blank and the heat treatment cover plate blank are assembled, welding is conducted, and an assembling assembly is obtained; performing water pressure detection on the assembly component under the water pressure of 0.6-0.8 MPa; and carrying out finish machining on the assembly component passing through the water pressure detection, and then carrying out helium leak detection to obtain a finished product water-cooling plate component. The water cooling plate assembly can be tightly combined with the semiconductor reaction cavity, the welding sealing performance is high, the heat conduction efficiency is high, heat is taken away through water cooling transfer, semiconductor equipment can be rapidly cooled, and the cooling efficiency is high.

The embodiment of the invention relates to a secondary battery, a battery pack and a vehicle. The present invention addresses the problem of providing a secondary battery, a battery pack, and a vehicle having excellent high-current performance, low-temperature performance, and high-temperature life performance. According to one embodiment, a secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte is provided. The non-aqueous electrolyte contains a non-aqueous solvent and an electrolyte containing lithium bis (fluorosulfonyl) imide, and the non-aqueous solvent contains a first solvent comprising at least one selected from the group consisting of ethyl propionate, propyl propionate, and ethyl butyrate, and a second solvent containing gamma-butyrolactone.

The invention provides a modified diaphragm for a polyanion solid sodium battery and a preparation method of the modified diaphragm. The modified diaphragm comprises: a base membrane; the solid electrolyte layer is arranged on at least one side surface of the base membrane, and the solid electrolyte layer comprises an oxide solid electrolyte and a polymer solid electrolyte; and the gel electrolyte layer is arranged on the outer surface of the oxide solid electrolyte layer. According to the invention, the diaphragm can better adapt to a high-pressure system, the transmission rate and the diffusion coefficient of sodium ions are improved, so that the cycle life of a polyanion solid sodium battery is prolonged, the rate capability and the low-temperature performance of the battery are improved, the thermal stability of the diaphragm is improved, and the service life of the battery is prolonged. The adverse effects of positive and negative electrode contact, chemical reaction and the like caused by thermal shrinkage of the diaphragm are avoided; in addition, the puncture resistance of the diaphragm is improved while the air permeability is not influenced and the dynamics is ensured, the addition amount of the liquid electrolyte is obviously reduced, and the safety performance of the battery is effectively improved.

The invention provides a negative electrode binder, a negative electrode plate and a secondary battery. The negative electrode binder comprises a granular polymer, wherein the polymer comprises a vinyl aromatic structural unit and an acrylate structural unit; the particle size D10 of the polymer ranges from 200 nm to 1300 nm, the particle size D50 of the polymer ranges from 400 nm to 1500 nm, and the particle size D90 of the polymer ranges from 500 nm to 2000 nm. The negative electrode binder provided by the invention has a relatively large particle size, and can improve the low-temperature discharge rate capability and peel strength of the battery.

The invention relates to the technical field of electrolyte preparation, and discloses a lithium ion battery electrolyte capable of ensuring low-temperature discharge characteristic, which comprises the following components in percentage by mass: 25% of propylene carbonate (PC), 35% of dimethyl carbonate (DMC), 20% of gamma-butyrolactone (GBL), 20% of ethyl acetate, 1.0 mol / L of lithium salt bis (trifluoromethanesulfonimide) (LiTFSI), 3% of additive 1, 3-propane sultone (PS) (mass fraction: 0.1% of sodium hydroxide (mass fraction: 0.1% of sodium hydroxide), and the balance of water. According to the present invention, the low temperature performance of the solution is improved, the unique solvent formula and the unique solvent ratio enable the electrolyte to have good fluidity in the low temperature environment, and the freezing point of the electrolyte is effectively reduced so as to ensure that the lithium ions can smoothly migrate between the electrodes at the low temperature, such that the lithium ion battery performance is improved, and the lithium ion battery performance is improved. The discharge performance of the battery under a low-temperature condition is obviously improved, and the application scene of the lithium ion battery is expanded.

The invention relates to the field of waterproof coiled materials, and discloses a modified waterproof coiled material based on a waste high polymer material and a preparation method thereof, and the modified waterproof coiled material comprises 40%-50% of waste thermoplastic polyurethane, 25%-30% of waste rubber powder, 15%-20% of asphalt, 5%-7% of nano-silica, 1%-2% of a silane coupling agent, 3%-5% of tackifying resin and 0.5%-1% of an antioxidant. The modified waterproof coiled material is prepared from waste high polymer materials, nano silicon dioxide is modified by a silane coupling agent and then forms chemical bonding or strong physical adsorption with the surface of a base layer, the interface bonding strength is remarkably improved, meanwhile, the tackifying resin is added, the overall viscosity of the coiled material is further enhanced, and the service life of the coiled material is prolonged. The adhesive can be firmly bonded under various base layer conditions, hollowing and falling phenomena are effectively prevented, resource recycling is realized, dependence on increasingly short raw materials such as traditional petroleum asphalt, SBS and APP is reduced, the production cost is reduced, the market competitiveness of the product is improved, the pressure of waste high polymer materials on the environment is relieved, and the adhesive has good application prospects. The sustainable development concept is met.

The invention discloses a preparation method of lithium ion battery negative electrode slurry, which is characterized by comprising the following steps: step 1, sequentially adding 0.5-1 part by weight of CMC dry powder, 0.5-1.2 parts by weight of a conductive agent and 95-97.5 parts by weight of an active substance into a stirring kettle, enabling the stirring kettle to rotate at 400-600 rpm and revolve at 20-30 rpm, and stirring for 20-30 minutes, so that each component is fully and uniformly dispersed to form required mixed powder; step 2, deionized water is added into the mixed powder obtained in the step 1 for kneading, the rotation speed of a stirring kettle is 0 rpm, the revolution speed of the stirring kettle is 20-30 rpm, and the kneading time is 30-60 min; 3, adding 1-2.5 parts by weight of PAA, dispersing at a high speed, and uniformly stirring; the rotation speed of the stirring kettle is 1500-2000 rpm, and the revolution speed is 25-30 rpm. According to the preparation method of the lithium ion battery negative electrode slurry disclosed by the invention, the viscosity characteristic of the slurry is reasonably regulated and controlled, so that the slurry is ensured to have excellent coating performance, and precipitation in the standing process can be avoided, thereby remarkably improving the uniformity and density of a battery negative electrode layer.

The invention relates to the technical field of elastic materials and refrigerator door sealing strips, in particular to a plant-based thermoplastic elastomer material and a preparation method and application thereof. The plant-based thermoplastic elastomer material contains a chlorinated polyethylene material, a polyethylene material, polyvinyl chloride, a plasticizer, a stabilizer, a lubricant, an antibacterial and mildew-proof agent, plant powder and a coupling and dispersing compatilizer. Wherein the plasticizer is a plant-based plasticizer; the particle size of the plant powder is 12-20 [mu] m. According to the plant-based thermoplastic elastomer material, the elastomer chlorinated polyethylene (CPE) is adopted as a main material, application of a traditional plasticizer is avoided, the low-odor plant-based plasticizer is adopted, odor is reduced, meanwhile, plant powder with plant faint scent is applied as filler, the hardness needed by the refrigerator sealing strip material can meet the sealing effect of a refrigerator, and the service life of the refrigerator is prolonged. And the problem of peculiar smell during door opening of the refrigerator is solved, the low-temperature performance is improved, and the method can be better applied to the field of manufacturing industry needing low-temperature sealing.

The invention discloses an environment-friendly waste asphalt mixture biological regenerant. The environment-friendly waste asphalt mixture biological regenerant comprises 60-70 wt% of an oil component, 10-20 wt% of a regeneration component, 4-8 wt% of an activator, 2-8 wt% of a penetrant and 2-5 wt% of a solubilizer, the oil component is composed of waste pine needle oil and waste epoxidized soybean oil. The environment-friendly waste asphalt mixture biological regenerant provided by the invention can improve the colloid structure of regenerated asphalt, enables the regenerated asphalt to recover good performance, has excellent permeability, can greatly improve the low-temperature performance of the waste asphalt mixture (PAP), and ensures good pavement performance of the waste asphalt mixture (PAP).

The invention discloses an ultralow-temperature electrolyte and a lithium carbon fluoride battery prepared from the ultralow-temperature electrolyte, and belongs to the technical field of batteries, the ultralow-temperature electrolyte comprises an organic solvent and a lithium salt, the organic solvent is a mixture of a carboxylic ester compound and a fluorinated ester compound, the concentration of the lithium salt in the electrolyte is 0.5-2.0 mol / L, and the concentration of the fluorinated ester compound in the electrolyte is 0.5-2.0 mol / L; the volume fraction of the carboxylic ester compound in the electrolyte is 70%-90%, the volume fraction of the fluorinated ester compound in the electrolyte is 10%-30%, and the prepared electrolyte is kept in a liquid state at-40 DEG C. Appropriate carboxylic ester and carbonic ester solvents are selected and used in a matched mode according to a certain proportion, and the conductivity of the electrolyte can be improved at low temperature, the viscosity can be reduced, the low-temperature activity can be enhanced, and the low-temperature performance can be improved.

The invention provides a tread rubber composition, tread rubber and a tire for a low-temperature ice surface. The tread rubber composition comprises 30-70 parts of natural rubber, 10-40 parts of butadiene rubber, 15-30 parts of modified trioctyl phosphate, 5-20 parts of nano diene, 40-60 parts of white carbon black, 2-4 parts of zinc oxide, 3-10 parts of a silane coupling agent, 1-2 parts of stearic acid, 1-2 parts of sulfur, 1-3 parts of an accelerant and 3-10 parts of an anti-aging agent. By optimizing the formula and selecting the materials, the road holding force and the wear resistance of the obtained tread rubber composition under the low-temperature ice surface condition are remarkably improved. Particularly, due to the introduction of the modified trioctyl phosphate, the low-temperature performance and the wet skid resistance of the rubber are enhanced, and due to the use of the nano diene, the mechanical strength and the cold resistance of the material are further improved.

This invention relates to a boron-doped multi-element polyanionic sodium-ion battery cathode material and its preparation method, comprising the following steps: [The method involves] mixing Na₄Fe₂O₃ with... 3‑X B X (PO4) 2‑Y (SiO4) Y The stoichiometric ratio of P2O7 is determined by adding ferrous source, boric acid, sodium source, phosphorus source, and silicon source to water, followed by the addition of carbon source and mixing thoroughly to obtain a mixed slurry; wherein 0.2≤X≤0.5, 0<Y≤1; the mixed slurry is then ground to obtain a sand-milled slurry; the sand-milled slurry is dried to obtain precursor powder; under a protective atmosphere, the precursor powder is sintered at 450~550℃ to obtain boron-doped multi-element polyanion sodium-ion battery cathode material. The introduction of boron and silicon elements in this invention helps reduce raw material costs, improve the electrochemical performance of the material, especially enhancing the structural stability, rate performance, and cycle life of the cathode material, and also lowers the sintering temperature, meeting the requirements for cost reduction and efficiency improvement.

The invention provides a synthetic lubricating oil composition and application thereof, and belongs to the technical field of lubricating oil. The synthetic lubricating oil composition comprises base oil, a pour point depressant and a composite additive, the base oil comprises synthetic ester base oil; the synthetic ester base oil consists of low-viscosity synthetic ester and high-viscosity synthetic ester. The composition has ultrahigh viscosity index and low-temperature performance, is diesel engine lubricating oil with very excellent low-temperature performance, passes a graphite flake friction characteristic test and a THOT oxidation test required by TES 439 specifications, and can meet the lubrication requirements of an engine and a transmission system.

The invention relates to the technical field of road materials, in particular to environment-friendly rubber modified asphalt as well as a preparation method and application thereof. The environment-friendly rubber modified asphalt is prepared from the following components in parts by mass: 100 parts of matrix asphalt; 1-5 parts of softening oil; the softening oil comprises aromatic oil, oleic acid, furfural extract oil and wax oil; 15 to 30 parts of micro-nano rubber particles; the micro-nano rubber particles are obtained from desulfurized and activated reclaimed rubber; 0.1 to 0.3 part of a stabilizing agent; and 0-3 parts of a high-molecular polymer. Compared with common rubber modified asphalt, the environment-friendly rubber modified asphalt disclosed by the invention has higher viscosity, excellent low-temperature performance and high-temperature performance, a stable system and environment-friendly construction environment, and the odor in the construction process is greatly reduced. The environment-friendly rubber asphalt is prepared by adopting an environment-friendly rubber particle wet method, the preparation process is simple, high-standard modified asphalt can be obtained through one-time feeding and a colloid mill, and the production cost is saved.

The invention relates to the technical field of batteries, in particular to a negative active material, a negative plate comprising the negative active material and a battery. The negative electrode active material comprises silicon-carbon composite particles; the particle size Dn10 of the silicon-carbon composite particles is 1-8 [mu] m; the average sphericity degree of the silicon-carbon composite particles is 0.6-1; the silicon-carbon composite particles have closed pores and open pores, and the volume V1 of the closed pores and the volume V2 of the open pores satisfy 0.2 < = V1 / V2 < = 2000. The negative electrode active material disclosed by the invention has relatively high ionic conductivity and electronic conductivity and relatively high structural stability while relatively high gram volume is ensured. Comprising the negative electrode active material disclosed by the invention can give consideration to relatively good initial coulombic efficiency, rate capability, low-temperature performance and cycling stability.

The invention relates to the technical field of battery electrolytes, and discloses a lithium ion battery electrolyte for improving low-temperature charging activity, which comprises the following formula and proportion: 30% of ethylene carbonate (EC), 30% of dimethyl carbonate (DMC), 30% of methyl ethyl carbonate (EMC), 5% of fluoroethylene carbonate (FEC), 1 mol / L of lithium bis (trifluoromethanesulfonimide) (LiTFSI), 0.1 mol / L of lithium nitrate (LiNO3), 0.1 mol / L of lithium ion battery electrolyte, 0.1 mol / L of lithium ion battery electrolyte and the balance of water. According to the method, the low-temperature performance can be improved, the electrolyte formula and the preparation method contribute to remarkably improving the charging activity of the lithium ion battery in a low-temperature environment, normal charging of the battery can be ensured under a low-temperature condition (such as-20 DEG C and below), the problem of charging difficulty caused by low temperature is reduced, the usability of the battery in a cold environment is improved, and the service life of the battery is prolonged. For example, the method can be applied to outdoor electronic equipment, electric automobiles and the like in cold winter in northern China.