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3540 results about "Side reaction" patented technology

A side reaction is a chemical reaction that occurs at the same time as the actual main reaction, but to a lesser extent. It leads to the formation of by-product, so that the yield of main product is reduced: A+B->[k₁]P₁ A+C->[k₂]P₂ P₁ is the main product if k₁> k₂. The by-product P₂ is generally undesirable and must be separated from the actual main product (usually in a costly process).

Positive electrode active material and its manufacturing method, positive electrode for lithium secondary cell using same, and lithium secondary cell

A positive active material is provided which can inhibit side reactions between the positive electrode and an electrolyte even at a high potential and which, when applied to a battery, can improve charge/discharge cycle performance without impairing battery performances even in storage in a charged state. Also provided are: a process for producing the active material; a positive electrode for lithium secondary batteries which employs the active material; and a lithium secondary battery which has improved charge/discharge cycle performance while retaining intact battery performances even after storage in a charged state and which can exhibit excellent charge/discharge cycle performance even when used at a high upper-limit voltage. The positive active material comprises: base particles able to dope and release lithium ions; and an element in Group 3 of the periodic table present on at least part of that part of the base particles which is able to come into contact with an electrolyte. It is produced by, e.g., a process which comprises: producing base particles containing lithium and able to dope and release lithium ions; and then imparting an element in Group 3 of the periodic table to the base particles so that the element can be present on at least part of that part of the base particles which is able to come into contact with an electrolyte.

Normal-temperature synthesis method for polycarboxylic acid water-reducing agent

The invention discloses a normal-temperature synthesis method for a polycarboxylic acid water-reducing agent, and belongs to the field of cement concrete water-reducing agents. The water-reducing agent is prepared by the following steps of: copolymerizing polyoxyethylene ether monomer or polyoxyethylene ester monomer a containing unsaturated double bonds, unsaturated monocarboxylic acid and derivative monomer thereof b, unsaturated dicarboxylic acid c and unsaturated sulfonic acid or salt monomer thereof d in aqueous solution under the action of an oxidation reduction initiator, and finally neutralizing the solution by using alkali solution to obtain the water-reducing agent. The reaction can be performed at room temperature by adopting an oxidation reduction initiating system, and the appropriate reaction temperature is between 5 and 30 DEG C; and the synthesis process does not need heating, so energy is saved, and high-temperature side reaction is effectively controlled. The prepared polycarboxylic acid high-performance water-reducing agent has the characteristics of high water-reducing rate and good collapse protecting performance. The water-reducing agent has wide application range, and the method has low production process requirement and is suitable for industrialized large-scale production.

Process for preparing multicomponent liquid glucose and lignose while effectively hydrolyzing lignocellulosic biomass

The invention discloses a method for efficiently hydrolyzing lignocellulosic biomass and synchronously preparing multi-component liquid glucose and lignin. The method comprises the steps that: the lignocellulosic biomass through physical crushing is added with phosphoric acid to perform acid hydrolysis; then organic solvent is added to extract the lignin, the layering and the phase separation are performed, then the lignin is extracted out while the organic solvent is reclaimed under the condition of pressure reduction and distillation; phosphoric acid can be reclaimed through steps such as neutralization, filtration, acidification and so on, hemicellulose hydrolyzed liquid glucose is obtained at the same time; and the remained cellulose undergoes the zymohydrolysis to prepare cellulosic hydrolyzed liquid glucose. The method can separate lignin, hemicellulose and cellulose, remarkably decreases the degree of crystallinity of the cellulose hydrolyzed by phosphoric acid, and remarkably improves the zymohydrolysis efficiency; and the prepared hydrolyzed liquid glucose does not contain fermentation inhibitors. The method has mild treatment conditions, simple process and less side reactions; the phosphoric acid and the organic solvent can both be reclaimed and circularly used; and the method is environment-friendly, and has broad social and economic benefits.

Electrolyte of lithium-ion battery and lithium-ion battery containing electrolyte

ActiveCN106505249AExcellent high temperature storageExcellent high temperature cycle performanceSecondary cells servicing/maintenanceOrganic electrolytesHigh temperature storageSide reaction
The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte of the lithium-ion battery and the lithium-ion battery containing the electrolyte. The electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises a film-forming additive A and a stabilizing additive B; the stabilizing additive B is a chainlike disulfonic acid ester compound as shown in a formula I and/or a formula II; and the film-forming additive A forms an SEI film on a negative electrode surface of the battery and the side reaction of a negative electrode interface and the electrolyte is reduced, so that the film-forming additive A is an necessary precondition that the battery has relatively good cycle performance. The stabilizing additive B can form a CEI film on a positive electrode surface, the activity of a positive electrode interface and the electrolyte is inhibited, direct contact oxidation of a positive electrode and the electrolyte is reduced, meanwhile, the structure stability of a positive electrode material is improved and the structure is not easy to collapse and crush due to generation of the stress, so that the electrolyte has excellent high-temperature storage performance and high-temperature cycle performance through combination of the additive A and the additive B.

Acesulfame potassium cyclization continuous production method

The invention relates to an acesulfame potassium cyclization continuous production method. The method is characterized in that the sulfonation reaction and hydrolysis reaction comprise the following steps: step a, separately pumping an intermediate generated during a synthesis reaction and sulfur trioxide into a sulfonation reactor in a certain speed, carrying out sulfonation reactions in the sulfonation reactor; step b, gasifying dichloromethane when the concentration of the reactants in the sulfonation reactor reach a certain level, spraying the sulfonation liquid into a hydrolysis reactor; step c, dropwise adding acidic water into the hydrolysis reactor to carry out hydrolysis reactions. The method has the advantages that an cyclization one-step reaction technology is adopted, thus the continuity of production operation is realized, and the work strength of workers is reduced; compared to the conventional intermittent production technology, the one-step reaction method has a higher stability, improves the service life of the reactor, shortens the reaction time, and reduces the side reactions. Furthermore, in the method, the sulfonation reaction temperature is raised, then dichloromethane gasification is utilized to reduce the reaction temperature, so that low temperature production is avoided, and a deep cooling ice machine is stopped, so the production efficient is greatly improved, and the energy consumption is largely reduced.

Method for preparing low-melting-point polyester composite fiber by adopting continuous polymerization and melt direct-spinning

The invention relates to a method for preparing a modified copolyester composite fiber, in particular to a method for preparing a low-melting-point polyester composite fiber by adopting continuous polymerization and melt direct-spinning. The method comprises the following steps: slurry is prepared from raw materials in proportion and added continuously into an esterification system for an esterification reaction, an obtained oligomer is uniformly mixed with polyether, the mixture enters a homogenizing kettle for transesterification and pre-polycondensation, a product is uniformly mixed with a chain extender for final polycondensation, and an obtained low-melting-point polyester melt and a common polyester melt enter a composite spinning assembly to prepare the low-melting-point polyester composite fiber which comprises a common polyester core layer and a low-melting-point polyester cortex layer. The method has the advantages as follows: a side reaction of thermal degradation of polyether components is inhibited effectively, and the color and spinnability of the low-melting-point polyester melt are improved; the problem of poor performance of composite spinning of the low-melting-point polyester on the cortex layer and the common polyester on the core layer due to large dynamic viscosity difference of the melt is solved, and the composite fiber is well formed; the production efficiency of the low-melting-point polyester composite fiber is improved.

Metal-organic frame material based composite battery diaphragm and preparation method and application thereof

The invention discloses a metal-organic frame material based composite battery diaphragm and a preparation method and application thereof. The preparation method comprises the following steps: (1), synthesizing a metal-organic frame material precursor; (2), compounding the metal-organic frame material precursor and a two-dimensional material or a polymer material to obtain the metal-organic framematerial based composite battery diaphragm. The diaphragm is high in porosity and large in specific surface area, the electrolyte wettability of the diaphragm can be improved, and the ion transport number of the diaphragm is greatly increased; the diaphragm has the advantage of an adjustable pore size, and through a suitable pore size, shuttling of electrolyte ions can be effectively controlled, occurrence of adverse side reactions can be inhibited, the battery capacity can be increased and the cycle life can be prolonged; through a uniform pore structure, the passing ions can be uniformly dispersed on the surface of an electrode, so that growth of dendrites are fundamentally inhibited, the cycle life of a battery is effectively prolonged, and the safety performance of the battery is improved; the metal-organic frame material based composite battery diaphragm has good flexibility and mechanical properties and can be applied to assembly of a practical soft pack battery.

Doped monocrystal multi-component material for lithium ion batteries and preparation method of such doped monocrystal multi-component material

The invention belongs to the technical field of anode materials for lithium ion batteries and particularly discloses a doped monocrystal multi-component material for lithium ion batteries and a preparation method of such doped monocrystal multi-component material. The doped monocrystal multi-component material and the preparation method thereof have the advantages that nickel-cobalt-manganese ternary materials are modified, and M-source metals are doped when a precursor is prepared to decrease the material sintering temperature and improve material tapping density, so that the mixed arrangement degree of Ni<2+> in a Li<+> layer is weakened obviously; through high-temperature sintering and tempering processes, the precursor of the multi-composite material, prepared through a coprecipitation method, is more stable in crystal structure, metal ions in the material are inhibited from dissolving through surface coating, side reaction between the metal ions and electrolyte is inhibited, and stability and electrochemical performance of an active material are further enhanced; a doped monocrystal multi-component material finished product is stable in crystal structure, high in safety and compaction density and excellent in rate capability and cycle performance, so that specific capacity and charge-discharge voltage of the material are further enhanced; the preparation method is small in doping quantity, simple to operate, easy to control, widely applicable and suitable for large-scale production.

High-nickel ternary positive electrode material coated with fast ion conductor, preparation method thereof, and lithium ion battery prepared from material

InactiveCN109879331AImprove ionic conductivityHigh initial charge-discharge specific capacityCell electrodesSecondary cellsElectrical conductorPhysical chemistry
The invention discloses a high-nickel ternary positive electrode material coated with a fast ion conductor, a preparation method thereof, and a lithium ion battery prepared from the material. The basematerial of the high-nickel ternary positive electrode material coated with the fast ion conductor is LiNi1-x-yCoxMnyMzO2, wherein x is more than 0 and not more than 0.15, y is more than 0 and not more than 0.15, z is not less than 0 and not more than 0.1, and M is any one or more of Al, Mg, Co, Ni, Ti, Fe, Zr, and Sn; and the chemical general formula of the fast ion conductor is Li1+aAaD2-a(PO4)3, wherein A is any one or more of Al, Cr, Ga, Fe, Sc, In, Lu, Y, and La, D is any one or more of Ti, Ge, Zr, Sn and Hf, and a is more than 0 and not more than 1. The coating of the surface with the fast ion conductor can effectively reduce the residual lithium on the surface of the ternary positive electrode material, and reduces side reactions of the ternary positive electrode material and an electrolyte; and the lithium ion battery assembled by using the positive electrode material has a high first charge-discharge specific capacity and a high capacity retention.

Cardanol polyoxyethylene ether and preparation method thereof

The invention provides cardanol polyoxyethylene ether and a preparation method thereof. The cardanol polyoxyethylene ether is prepared by reacting cardanol and epoxy ethane. The method comprises the following steps of: adding a catalyst and the cardanol into a reaction kettle during a reaction; fully stirring at the temperature of between 150 and 180 DEG C; introducing the epoxy ethane into the reaction kettle; performing polyreaction with stirring; adding acetic acid after the reaction for neutralization; and discharging after cooling so as to obtain the cardanol polyoxyethylene ether. The cardanol polyoxyethylene ether and the preparation method thereof have the advantages of a small number of side reactions, good color and luster of a product, mild reaction condition and low cost of raw materials. Natural cardanol is taken as a raw material for producing, so that the adverse effect of alkylpheol ethoxylates synthesized from petroleum on the environment is avoided. The cardanol polyoxyethylene ether belongs to linear chain alkylpheol ethoxylates and the hydrophile-lipophile balance (HLB) of a nonionic surfactant can be controlled by adjusting the adduct number of the epoxy ethane according to a process, so that the cardanol polyoxyethylene ether can be taken as an emulsifier, a lubricant, a washing agent, a solubilizing agent and the like.
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