46results about How to "Improve the problem of gas production" patented technology

The invention discloses a graded high-nickel ternary anode material, and a preparation method and an application thereof. The graded high-nickel ternary anode material is prepared by the following method: 1) mixing a high-nickel polycrystalline precursor with anhydrous LiOH and a doping additive, performing sintering, mixing the obtained product with a coating additive, and performing sintering toobtain a high-nickel polycrystalline material; 2) mixing a ternary monocrystalline silicon precursor with a lithium source and the doping additive, performing sintering, mixing the obtained product with the coating additive, and performing sintering to obtain a ternary monocrystalline silicon material; and 3) mixing the high-nickel polycrystalline material with the ternary monocrystalline siliconmaterial, or mixing the mixed material with the coating additive, and then performing sintering. The invention further discloses an application of the graded high-nickel ternary anode material in lithium batteries. The graded material prepared by the method provided by the invention has higher compaction and cycle stability than the single polycrystalline material, has higher capacity than the single monocrystalline silicon, and the gas production and service life problems of the battery can be effectively improved after the grading modification.

The invention provides a positive electrode plate and a lithium ion battery. The positive electrode plate comprises a positive current collector and a positive active material layer arranged on the positive current collector; the positive active material layer comprises a first sub-layer and a second sub-layer, wherein the first sub-layer is located on the outermost layer of the positive active material layer, and the second sub-layer is located between the positive current collector and the first sub-layer; the first sub-layer comprises a first positive electrode active material, the second sub-layer comprises a second positive electrode active material, and the first positive electrode active material is selected from one or more of a ternary positive electrode material with a single crystal or single crystal-like structure and a coating modification material of the ternary positive electrode material. The energy density of the lithium ion battery can be improved, and the gas production rate of the lithium ion battery can be reduced, so that the lithium ion battery has the advantages of high energy density and good storage performance.

Provided is a method and composition for the in-situ generation of synthetic sweet spots in tight-gas formations. The composition can include nitrogen generating compounds, which upon activation, react to generate heat and nitrogen gas. The method of using the composition includes injecting the composition into a tight-gas formation such that upon activation, heat and nitrogen gas are generated. Upon the generation of nitrogen gas and heat within the formation, microfractures are produced within the formation and the hydrostatic pressure within the reservoir is reduced to less than the reservoir fluid pressure, such that the rate of production of hydrocarbons from the formation is increased.

The invention discloses a positive electrode piece having concentration gradient and a preparation method thereof. The method is characterized by preparing active substances, conductive agents and binding agents in different proportions into slurry 1 and slurry 2, and then, coating the slurry 1, the slurry 2 and the slurry 1 on an aluminum foil through a step coating method to prepare the positiveelectrode piece having the concentration gradient. The active substances on the positive electrode piece are mostly concentrated on an intermediate layer, so that microcracks caused due to size expansion and contraction of a battery in the charging and discharging process can be reduced; the side close to a current collector and the side away from the current collector are rich in the conductiveagents and the binding agents, thereby facilitating fast charge transfer, reducing charge transfer impedance and effectively improving rate capability and power performance of a battery core; and direct contact between the electrolyte and a positive electrode material can be avoided to some extent, thereby relieving the problem of gas production of the battery core, and improving thermal stabilityand cycling performance of the battery.

The invention provides a method for lowering gas production in high temperature storage of a high-nickel battery. The method comprises the following steps of performing mixing and stirring on a positive electrode material and a gas production suppression additive to obtain positive electrode paste; coating a positive electrode current collector with the positive electrode paste, and performing drying treatment to form a positive electrode plate; enabling the positive electrode plate, a matched negative electrode plate and a diaphragm to be assembled in a battery shell, and then performing electrolyte injection to the battery shell for the first time; standing for an appointed time at an appointed temperature, and then performing formation treatment; and after discharging gas from the battery shell, performing electrolyte injection for the second time. By virtue of the method, the problem of gas production in high temperature storage of the battery which takes the high nickel material as the positive electrode can be relieved; the added gas production suppression additive only performs film formation on the positive electrode, so that loss on the negative electrode can be lowered, and the utilization rate of the additive is improved; and the gas production suppression additive is added only in a positive electrode paste mixing stage, so that the usage amount of the gas production suppression additive is lowered while a condition of lithium separating-out from the positive electrode is also relieved.

The invention provides an electrolyte solution, comprising an organic solvent, lithium salt and an additive, wherein the additive comprises an additive 1 and an additive 2, the additive 1 is a compound having a nitrile group and a double bond structure, and its general formula is shown in description; and R1, R2, R3, R4, R5, R6 and R7 in the general formula are substituent groups such as hydrogen,alkyl group, phenyl group, alkenyl, fluorinated alkyl and halogen independently. The nitrile group can be subjected to complexation with the surface of a positive electrode, the olefin part can be subjected to polymerization reaction, and a cyclic structure can control the degree of polymerization, thereby controlling the density of the complexed nitrile group, forming a stable and well-proportioned SEI film, inhibiting side reactions of the electrolyte solution and the positive electrode material at a high temperature or high voltage, and improving cell gas production, storage and cycling performance.

The invention discloses a cell gas generation testing system. The system comprises a sealed testing box, an inert gas source and an analyzing device and is characterized in that the sealed testing boxis used for accommodating a cell and is provided with a gas inlet and a gas outlet; the inert gas source is connected with the gas inlet through a gas inlet pipeline; the analyzing device is connected with the gas outlet through a gas outlet pipeline, the gas outlet pipeline is provided with a connector, and the connector is connected with a vacuum pump through a first pipeline. Compared with theprior art, the system has the advantages that the gas generation behavior of the cell at every moment can be monitored, and high testing precision is achieved; the analyzing device is used to analyzethe components and content of the gas generated by the cell, so that qualitative and quantitative analysis of cell gas generation is achieved; the cell is located in the inert atmosphere in the wholegas generation testing to avoid the risks of accidents.

The invention relates to an anti-explosion solar energy methane-generating pit, which comprises a fermenting and aggregating box 8, a composite convex lens 2, a protective cover 1, a solar heat-collection plate 3, an anti-explosion heat-insulating container 4, an electric heating converter 5, a temperature sensor 6, a heat-insulating controller box 9, a quick fermenting and aggregating box 11 and a support saddle 7, wherein the anti-explosion heat-insulating container 4 is arranged on the upper part of the fermenting and aggregating box 8; the quick fermenting and aggregating box 11 is provided with an air vent 113 which is communicated with the fermenting and aggregating box 8, and the air vent 113 is arranged on the upper part of the inside of the fermenting and aggregating box 8; the anti-explosion heat-insulating container 4 is hermetically connected with a container cavity of the anti-explosion heat-insulating container 4 into a whole through the solar heat-collection plate 3, and hermetically arranged on the support saddle 7; and an input pipe 41, an input control valve 42, an output pipe 43, a pressure retaining valve 44, an insulator 46 and a wire sleeve 45 are arranged on the anti-explosion heat-insulating container 4. The invention can collect solar energy into a central position of the methane-generating pit, provide and control the required or optimum survival temperature or breeding temperature of methane backeria and the like, properly sort and treat gas-generating raw materials, and guarantee full utilization and safe use of organic waste and the methane-generating pit.

The invention provides a pre-lithiated silicon-based negative electrode plate and a preparation method and application thereof. The preparation method comprises the following steps of: (1) mixing a silicon-based negative electrode material, a conductive agent and a binder, coating a current collector with the mixture to obtain a silicon-based negative electrode plate, and arranging a micro-porous structure on the surface of the silicon-based negative electrode plate; (2) mixing lithium metal, aromatic hydrocarbon and an organic solvent to obtain a Li-aromatic hydrocarbon compound; and (3) carrying out pre-lithiation on the silicon-based negative electrode plate with a micro-porous structure obtained in the step (1) by using the Li-aromatic compound obtained in the step (2), and carrying out post-treatment to obtain the pre-lithiated silicon-based negative electrode plate. According to the pre-lithiated negative electrode plate prepared by the method disclosed by the invention, the initial coulombic efficiency of the negative electrode of a battery can be improved while the high specific capacity of the negative electrode is ensured, and the electrochemical performance of the battery is also improved.

The invention discloses a preparation method of a spherical lithium titanate material. The preparation method comprises the following steps: weighing an organic lithium source and titanate in a certain proportion, then sequentially adding into a high-shear homogenizing and emulsifying machine containing a certain amount of an alcohol solvent, and dissolving to obtain a uniformly dispersed solution; then adding a certain amount of acidic oxide, and continuing dispersing to obtain a uniformly distributed suspension; then performing closed spray drying on the suspension to obtain a spheroidized precursor; finally, sintering in an air atmosphere to obtain the spherical lithium titanate material. The soluble lithium source and a soluble titanium source are used as raw materials, so that uniformdispersion in the molecular level can be achieved; the acidic oxide is used for coating, so that the pH value of the material is properly reduced, the water absorption is relieved and a gas production problem of a battery core is improved; in addition, being the spherical material, the spherical lithium titanate material can increase the tap density; the selected raw materials are widely available, and a technical route of a high-temperature solid phase method is easier for industrial production.

The invention provides an electrolyte and a lithium ion battery. The electrolyte comprises an organic solvent, LiPF6 and an additive, the additive comprises a tetra(trialkylsiloxy)silane compound shown in formula I shown in the description, and R in the formula I is selected from any one of C1-C4 alkyl groups. The tetra(trialkylsiloxy)silane compound in the electrolyte contains more silicon-oxygen bonds, and substituent groups on the tetra(trialkylsiloxy)silane compound integrate the advantages of a charge induction effect and a steric hindrance effect, so that the tetra(trialkylsiloxy)silane compound is subjected to a hydrolysis reaction to the maximum extent, that is the tetrakis(trimethylsiloxy)silane can react with 4 moles of water molecules, such that the residual water in the lithium ion battery system can be removed so as to substantially improve the gas production problem of the lithium ion battery, and further improve the comprehensive performances such as the high temperature stability, the cycle stability and the like of the lithium ion battery;.

The invention relates to a formula and a method for improving gas producing and holding capacity of raw frozen steamed bread and belongs to the technical field of food processing. A 0.6% yeast and an 0.8% compound additive are added to flour; the compound additive comprises a leavening agent, an antioxidant, an emulsifier and a thickening agent. The 0.6% yeast and the 0.8% compound additive are mixed and added to the flour, water is added, the mixture is stirred in a dough mixer at the medium speed until dough is completely expanded, and the mixture is left to stand, formed, quick-frozen at the temperature of subzero 34 DEG C and then freeze-stored at the temperature of subzero 18 DEG C. The method is simple in technology, the gas producing and holding capacity of the dough is improved obviously, the method is particularly applicable to a frozen dough system, the development of steamed bread is quick-frozen steamed bread in the future, and development of the steamed bread production towards industrialization and mechanization is made possible with the method.

The invention discloses an EC-free lithium ion battery electrolyte suitable for a high nickel-silicon carbon system, and relates to the technical field of lithium-ion batteries. The electrolyte comprises an electrolyte lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises a sulfur-nitrogen compound additive A with a structure shown in a formula 1 and a conventional film-forming additive, cyclic ester in the solvent system comprises propylene carbonate (PC) and fluoroethylene carbonate (FEC), and linear ester comprises at least one of dimethyl carbonate, diethyl carbonate (DEC) and ethyl methyl carbonate. According to the electrolyte disclosed by the invention, a synergistic effect generated by combined use of the additive A and the conventional additive is utilized; an electrolyte capable of effectively improving the performance of the high nickel-silicon carbon system lithium ion power battery is provided, and the electrolyte has good electrochemical properties such as cycle performance, rate capability and storage performance under high-temperature and low-temperature conditions, so that the problem of gas production of an existing high nickel-silicon carbon system under high voltage is solved.

The invention belongs to the technical field of new energy, and particularly relates to a lithium ion battery, which comprises a battery positive electrode, a battery negative electrode, a diaphragm arranged between the battery positive electrode and the battery negative electrode and a non-aqueous electrolytic solution, wherein the battery positive electrode comprises a positive electrode active material, the mass fraction of the nickel element in the active material is greater than or equal to 30%, and the non-aqueous electrolytic solution comprises compounds as shown in a structural formula 1 and a structural formula 2. According to the invention, the compounds represented by the structural formula 1 and the structural formula 2 are added to the non-aqueous electrolytic solution in the embodiment of the invention at the same time and are combined to react in the battery formation process, so that the generation of olefin gases is inhibited, combined products with relatively large impedance are reduced, and the high-temperature storage and high-temperature cycle performance of the battery is improved.

The invention provides a ternary positive electrode material, a lithium ion battery positive plate and application thereof. The ternary positive electrode material comprises 96 to 99.98 wt% of a nickel-cobalt-manganese ternary material, 0.01 to 2 wt% of a first inorganic coating material and 0.01 to 2 wt% of a second inorganic coating material, wherein the first inorganic coating material comprises a cobalt compound. The surface of the ternary material is coated with the cobalt compound and the other compound, and by controlling the quality of the cobalt compound and the other compound in the ternary positive electrode material, the two compounds interact with each other, so that the gas production problem of the lithium ion battery can be effectively improved, and the power performance of the lithium ion battery is improved. The ternary material is coated with two coating auxiliary materials through a one-step method by sintering once and regulating and controlling the sequence and temperature of adding the auxiliary materials, the coating and sintering process is improved, and the performance optimization is realized.

The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte suitable for a silicon-carbon negative electrode lithium ion battery and the silicon-carbon negative electrode lithium ion battery. The electrolyte suitable for the lithium ion battery is prepared from a non-aqueous organic solvent, lithium salt and additives. The additives comprise fluoroethylene carbonate, tris(trimethylsilyl) borate and a sulphate compound with the formula (1) or the formula (2). Compared with the prior art, under the synergistic effect of the three additives in combined use, the capability of changing and controlling SEI composition and stability is achieved, the overall impedance of a formed SEI film is small, and the components and the structure of the SEI film are stable, so that the reversible capacity of the silicon-carbon negative electrode lithium ion battery is greatly increased, the actual discharge capability of the silicon-carbon negative electrode lithium ion battery is greatly improved, then the battery has good cycle performance and good high-and-low temperature performance, and it is guaranteed that the battery can be used within a wide ambient temperature range.

The invention provides a ternary positive electrode material and a preparation method and application thereof. The ternary positive electrode material comprises a coating layer arranged on the surface, and the coating layer comprises a tungsten-containing compound and a co-coating layer of at least one effective element compound; the effective elements comprise any one or a combination of at least two of B, Mg, Al, Si, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Nb, Mo, Ru, Sn, Sb, Ba, Hf, Ta, Re or Bi. The ternary positive electrode material is coated by taking the tungsten-containing compound and the at least one effective element compound as the coating source, so that the side reaction between the ternary positive electrode material and electrolyte is reduced, the diffusion of lithium ions is promoted, the power performance and the cycle performance of the material are improved, and the gas production problem is effectively improved; according to the preparation method, the surface of the ternary positive electrode material is coated through one-time sintering treatment, the preparation method is simple, and industrial production is facilitated.

The invention discloses a single-crystal ternary positive electrode material. The chemical formula of the single-crystal ternary positive electrode material is LiNi(1-x-y-z)CoxMnyMzO2@Ai, wherein M isat least two of Zr, Al, Yb, Sr, La, Y, Ti, Sn, Mo, Si or W; wherein the A is one or two of H3BO3, B2O3, Li2B4O7, Li3PO4, Li2HPO3, LiH2PO4 and H3PO4, and the B is one or two of Li2B4O7, Li3PO4, Li2HPO3, LiH2PO4 and H3PO4; x is larger than 0 and smaller than or equal to 0.2, y is larger than 0 and smaller than or equal to 0.35, z is larger than 0 and smaller than or equal to 0.006, and i is largerthan or equal to 0.0008 and smaller than or equal to 0.008. The single-crystal ternary positive electrode material has the advantages of high power, high cycle, high voltage, high capacity, high energy density, high safety, low price, capability of realizing industrial production and the like.

The invention discloses an electrolyte of a silicon-carbon negative electrode lithium ion battery. The electrolyte comprises an electrolyte lithium salt, a non-aqueous organic solvent, a film-forming additive and a high-temperature-resistant additive, and the high-temperature-resistant additive is N, N, N-trifluoromethyl cyano ester ammonium sulfonate. The invention also discloses a silicon-carbon negative electrode lithium ion battery which comprises the electrolyte. The N, N, N-trifluoromethyl cyano ester ammonium sulfonate is added into the electrolyte so that high-temperature storage gas production of the silicon-carbon negative electrode lithium ion battery can be inhibited, the internal resistance is reduced, and the high-temperature storage capacity retention rate and the high-temperature cycle performance are improved.

The invention provides a lithium ion battery positive electrode material and a preparation method and application thereof. The lithium ion battery positive electrode material is a ternary material with the surface coated with a coating layer, and the coating layer comprises a co-coating layer containing tungsten and at least one effective element compound; the effective elements comprise any one or a combination of at least two of Al, Mg, Zr, Ba, Mn, Rb, Co, Si, Ni, Sr, Ce or Bi. The ternary material is coated by taking the compound containing tungsten and at least one effective element as a coating source, so that the conductivity and chemical stability of the ternary material can be improved, the side reaction between the ternary material and an electrolyte is reduced, the gas production problem can be effectively improved, and the power performance of the material can be improved; co-coating of the ternary material can be achieved through one-time sintering treatment, the preparation method is simple, and large-scale production is facilitated.

The invention relates to a silicon-oxygen composite negative electrode material and a preparation method thereof, and a lithium ion battery, the silicon-oxygen composite negative electrode material comprises an active material, the active material comprises a skeleton structure and a silicon-oxygen material embedded on the skeleton structure; the skeleton structure comprises a lithium silicate skeleton located in the active material and a water-insoluble silicate skeleton located on the surface layer of the active material, the water-insoluble silicate skeleton is connected with the lithium silicate skeleton, and in an XRD pattern of the silicon-oxygen composite negative electrode material, the intensity of the strongest diffraction characteristic peak of lithium silicate is IA, and the intensity of the strongest diffraction characteristic peak of lithium silicate is IB; the intensity of the strongest diffraction characteristic peak of the water-insoluble silicate is IB, and IB / IA is more than or equal to 0.03 and less than or equal to 0.2. The silicon-oxygen composite negative electrode material and the preparation method thereof have the advantages of simplicity, low cost and easy realization of industrial production, and the prepared silicon-oxygen composite negative electrode material can improve the processing performance, has excellent electrochemical cycle and expansion inhibition performance, and can prolong the service life of a lithium ion battery.

The invention provides a deep coal seam fluidized coal and coal bed gas co-mining and CO2 storage integrated method. The method comprises the steps of multi-branch horizontal well building, water jet flow cavity building and coal and coal bed gas co-mining, coal bed drainage pressure relief and coal bed gas mining, and CO2 injection and storage. According to the method, a ground development mode is adopted, based on a water jet technology, cavity building and pressure relief are carried out, coal and coal bed gas are jointly mined, coal bed cavities which are provided with certain coal pillar supports and are communicated with each other are formed underground, after coal and coal bed gas mining is basically completed, then mining is converted into injection, CO2 injection and storage are carried out, and the coal and coal bed gas are fully exploited. Safe and efficient development of deep coal and coal bed gas resources and CO2 storage integrated operation can be achieved, and a deep coal bed is built into a CO2 underground gas storage capable of achieving cyclic injection and output.

The invention provides a lithium ion battery positive pole piece and a preparation method and application thereof, and the preparation method of a coated modified ternary material in the lithium ion positive pole piece comprises the following steps: mixing a binary compound and a ternary material to obtain a mixture, and sintering the mixture to obtain the coated modified ternary material, wherein the binary compound comprises any one of Co-M-X compounds or a combination of at least two of the Co-M-X compounds; M in the Co-M-X compound comprises any one or a combination of at least two of Al, Sn, Ti, Zr, Ba, Mg, Mn, W, Ni, Bi or rare earth elements; and X in the Co-M-X compound is an element O. According to the invention, the coating sintering process of the ternary material is optimized, and the binary compound containing cobalt and another effective element is taken as a coating source, so that the coating effect of the ternary material is optimized, the power performance of the lithium ion battery is improved, and the gas production problem of the lithium ion battery is solved.

The invention discloses a lithium titanate composite oxide, a modified lithium titanate material, and a preparation method and application thereof. The preparation method comprises the following steps: a raw material mixture of a lithium source compound and a titanium source compound is calcined and then subjected to surface reduction treatment to obtain a lithium titanium composite oxide; whereinthe molar ratio of lithium element to titanium element in the raw material mixture is b, and 0.75 < b < 0.8; the surface reduction treatment is carried out in a reducing atmosphere, wherein the reducing atmosphere is a hydrogen atmosphere or mixed atmosphere of hydrogen and other gases, and the other gases are nitrogen and / or inert gases, and the temperature of the surface reduction treatment is600 DEG C-800 DEG C, and the time of surface reduction treatment is 5-15h. The lithium titanium compound prepared by the preparation method has higher ionic and electronic conductivity, so the addition of conductive carbon black in the manufacturing process of the battery electrode sheet can be reduced, and the battery prepared by the preparation method has excellent cycling performance.

The invention discloses a preparation method of artificial graphite and a lithium ion battery. The preparation method of the artificial graphite comprises the following steps: S10, carrying out graphitization treatment on raw material coke powder to obtain an intermediate; s20, uniformly mixing a second raw material with the intermediate to obtain a composite precursor; amd s30, carrying out carbonization treatment on the composite precursor at 900-1400 DEG C under the protection of protective gas to obtain artificial graphite; wherein the second raw material comprises a liquid-phase coating agent. Through liquid phase coating, the surface morphology of the artificial graphite can be effectively improved, the specific surface area is reduced, active sites of side reactions are reduced, gas production of the lithium ion battery is reduced, volume expansion is reduced, and the safety performance of the lithium ion battery is improved; in addition, graphitization treatment is performed firstly and then coating is performed, so that the prepared artificial graphite has relatively good liquid absorption performance, the internal resistance is reduced, the low-temperature performance is improved, the reduction of the internal resistance is beneficial to the movement of lithium ions, and the prepared lithium ion battery has relatively good fast charging performance.

The application provides a positive electrode sheet and a lithium ion battery. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer disposed on the positive electrode current collector, the positive electrode active material layer includes a first sublayer and a second sublayer, and the first sublayer is located on the positive electrode The outermost layer of the active material layer, the second sublayer is located between the positive electrode current collector and the first sublayer. The first sublayer includes a first positive electrode active material, the second sublayer includes a second positive electrode active material, and the first positive electrode active material is selected from single crystal or single crystal-like ternary positive electrode materials and their Coating one or more of the modified materials. The application can improve the energy density of the lithium-ion battery and reduce the gas production of the lithium-ion battery, so that the lithium-ion battery has the advantages of high energy density and good storage performance.

The invention discloses a preparation method of a spherical lithium titanate material. The preparation method comprises the following steps: weighing an organic lithium source and titanate in a certain proportion, then sequentially adding into a high-shear homogenizing and emulsifying machine containing a certain amount of an alcohol solvent, and dissolving to obtain a uniformly dispersed solution; then adding a certain amount of acidic oxide, and continuing dispersing to obtain a uniformly distributed suspension; then performing closed spray drying on the suspension to obtain a spheroidized precursor; finally, sintering in an air atmosphere to obtain the spherical lithium titanate material. The soluble lithium source and a soluble titanium source are used as raw materials, so that uniformdispersion in the molecular level can be achieved; the acidic oxide is used for coating, so that the pH value of the material is properly reduced, the water absorption is relieved and a gas production problem of a battery core is improved; in addition, being the spherical material, the spherical lithium titanate material can increase the tap density; the selected raw materials are widely available, and a technical route of a high-temperature solid phase method is easier for industrial production.