32results about How to "Suppress shuffling" patented technology

The invention discloses a method for preparing a high-rate nickel cobalt lithium aluminate anode material. The method comprises the following steps: (1) preparing a nickel cobalt lithium aluminate precursor; (2) performing lithium-site doping and modifying on potassium ions; and (3) constructing a cladding layer of a lithium-containing compound. According to the method, the dispersing speed of lithium ions is effectively increased by lithium-site replacement of potassium ions, and the rate capability of a material can be improved; the lithium-containing compound layer constructed on the material surface can be used for reducing the content of alkali remained on the material surface and reduce later cell bubbling; side reaction can be effectively inhibited, and the material structure stability in the cycling process can be promoted; and the lithium-containing compound layer has high conducting performance for lithium ions, embedding and separating of lithium ions can be accelerated, the problem of poor lithium ion conductivity when conventional metal oxide is used as the cladding layer can be solved, and the cycling performance and rate performance of the material can be improved.

The invention relates to a preparation method of an NCM ternary cathode material doped with Al<3+> on the surface and belongs to the field of chemical energy storage batteries. The preparation methodprovided by the invention has the benefits that aluminum nitrate is added in the mixing process of a nickel-cobalt-manganese hydroxide precursor and lithium hydroxide to realize the doping of the Al<3+> on a lithium layer on the surface; compared with the situation that the Al<3+> is doped on a transition metal layer in the preparation process of the nickel-cobalt-manganese hydroxide precursor, the Al<3+> exists on the lithium layer and can better play a supporting role, less Al<3+> can be used to achieve a structure stabilizing effect, and particularly, and the improvement effect on electrochemical performance at high voltage and high rate is significant. The preparation method provided by the invention is simple to operate, a process and a technology are easy to realize, the large-scalecommercial application can be realized, and the method can be used for Al<3+> doping on the surface of other ternary cathode materials or a lithium-rich cathode material.

The invention provides a quaternary positive electrode material precursor. The quaternary positive electrode material precursor is of a core-shell structure, the material formula of a core is Ni<1-x-y-z>Co<x>Al<y>Mn<z>CO3, the material formula of the core is Ni<1-r-s-t>Co<r>Al<s>Mn<t>(OH)2, wherein (1-x-y-z) is a numeral value between 0.80 and 0.96, x is larger than 0, y is a numeral value between0.01 and 0.10, z is a numeral value between 0.01 and 0.10, (1-r-s-t) is a numeral value between 0.34 and 0.70, r is larger than 0, s is a numeral value between 0.20 and 0.40, and t a numeral value between 0.20 and 0.40. The quaternary positive electrode material is stable in structure, high in safety, long in cycle lifetime and good in thermal stability.

The invention provides a cathode material precursor which is of a core-shell structure. The material chemical formula of the core is Ni<1-x-y-z>Co<x>Al<y>Mn<z>(OH)2, and the material chemical formulaof the shell is Ni<1-r-s>Co<r>Mn<s>CO3, wherein 1-x-y-z is a value in the range of 0.80 to 0.96, x is greater than 0, y is a value in the range of 0.01 to 0.10, z is a value in the range of 0.01 to 0.10, 1-r-s is a value in the range of 0.34 to 0.70, r is greater than 0, and s is a value in the range of 0.20 to 0.40. The cathode material of the invention has a stable structure, high safety performance, long cycle life and good thermal stability.

The invention discloses a five-element lithium ion battery positive electrode material with an equivalent valence ratio, high stability and long cycle, a preparation method and a lithium battery prepared from the five-element lithium ion battery positive electrode material. The five-element positive electrode material has the following structure: Li(NiCoMn)xAyBzO2, wherein x is greater than or equal to 0.98, the element A comprises one of Mg and Sr, the element B is one of Zr, Ti and W, and the ratio of the element A to the element B needs to meet the following equation: (3-A valence)*y=(B valence-3)*z, and x+y+z=1. Compared with traditional ternary and other non-equal-proportion system materials, the five-element lithium ion battery positive electrode material has higher structural stability, and the cycle performance is obviously improved; and material defects are few, Li/Ni mixed arrangement is low, and the rate capability is more excellent.

The invention relates to high-capacity imidazole ionic liquid as well as a preparation method and an application thereof. The structural formula of the ionic liquid is shown in the specification, in the formula, R1 is CH2(CH2)aO(CH2)bCH3, a is 0 or 1, and b is 0 or 1; R2 is CH2(CH2)cCOO(CH2)dCH3, c is 0 or 1, and d is 0 or 1; Y<-> is BF4<->, PF6<->, TFSI<->, FSI<-> or N(CN) 2<->. In the preparation of the imidazole ionic liquid, through ternary substitution, ether groups are introduced to the N-1 site of an imidazole ring, so that the viscosity of the ionic liquid is reduced; an ester group isintroduced to the N-3 site of the imidazole ring, so that the electrochemical window and the electrochemical stability of the ionic liquid are improved. The imidazole ionic liquid is used as an electrolyte additive, is applied to a lithium ion battery taking a ternary material (NCM523) as a positive electrode material, and has good safety performance and electrochemical performance.

The present invention provides an anode material precursor. The anode material precursor comprises a core-shell structure, the material chemical formula of the core is Ni1-x-y-zCoxAlyMnzCO3, the material chemical formula of the shell is Ni1-r-sCorAls(OH)2, (1-x-y-z) is a value in the range of 0.80- 0.96, x is greater than 0, y is a value in the range of 0.01-0.10, z is a value in the range of 0.01-0.10, (1-r-s) is a value in the range of 0.34- 0.70, r is larger than 0, and s is a value in a range of 0.20-0.40. The anode material is stable in structure, high in safety, long in cycle life and good in thermal stability.

The invention discloses an MOFs-based precursor for a cobalt-free lithium battery, wherein the structural formula of the precursor is NixMnyAl1-x-yMOFs, the inner core of the precursor is a nickel-manganese-MOFs material, Ni accounts for 10-90% of the molar percentage of the total metal of the inner core, Mn accounts for 10-80% of the molar percentage of the total metal of the inner core, the shell of the precursor is made of a nickel-aluminum-MOFs material, Ni accounts for 70-99% of the molar percentage of total metal in the shell, and aluminum accounts for 1-30% of the molar percentage of the total metal in the shell. According to the MOF-based precursor formed in the invention, volatile gas is generated by organic matters during low-temperature pre-sintering, so that a porous structure is finally formed by the material, de-intercalation of Li is facilitated, the sintering temperature is reduced, the rate capability in a cyclic process can be improved, and the good development prospect is achieved.

The invention belongs to the field of lithium ion batteries, and specifically provides a high-potential lithium ion battery cathode material LiNi<0.5-x>MxMn<1.5-y>SiyO4 and a preparation method thereof, wherein M is Mg, Zn, Cu and V, x is greater than 0 and smaller than or equal to 0.1, y is greater than 0 and smaller than or equal to 0.2, so that the defect that electrochemical circulating performance is poor when the LiNi0.5Mn1.5O4 is under high potential is overcome. An element Si is adopted to replace part of an element Mn, and metal M is adopted to replace part of an element Ni, so that the lithium ion battery cathode material LiNi<0.5-x>MxMn<1.5-y>SiyO4 has relatively high working voltage, relatively high energy density and excellent circulating stable performance after bulk-phase cooperative doping is realized, and therefore, large-multiplying-power charging and discharging needs can be met; and moreover, a mixed complexing agent is adopted to improve a sol-gel preparation process; the prepared product is high in purity, is high in chemical uniformity, is high in crystallization quality, is fine and uniform in product particles, is excellent in electrochemical performance, is low in manufacturing cost, and is suitable for large-scale industrial production.

The method comprises the following steps: (1) collecting a lithium ion battery positive pole piece and separating out a current collector to obtain the lithium ion battery positive pole material; and (2) the lithium ion battery positive electrode material obtained in the step (1) is fully mixed with a solid-state lithium source according to the lithium matching amount Li/TM of 1-1.1, then the mixture is subjected to microwave treatment in the air or pure oxygen atmosphere, in the formula Li/TM, Li is the mole number of Li in the solid-state lithium source, and TM is the sum of the mole numbers of metal elements in the lithium ion battery positive electrode material obtained in the step (1). Through microwave treatment, the energy consumption can be reduced, lithium supplementation of the positive electrode material is realized, the supplemented lithium can reach the inside of the positive electrode material, higher capacity recovery is realized, and meanwhile, the structure of the positive electrode material is recovered.

The invention provides a ternary positive electrode precursor and a preparation method and application thereof. The chemical formula of the ternary positive electrode precursor is NixCoyMn1-x-yCO3. AMg(BO2)2.BCe2(CO3)3, x is greater than 0 and less than 1, y is greater than 0 and less than 1, a is greater than or equal to 0.001 and less than or equal to 0.1, and b is greater than or equal to 0.0005 and less than or equal to 0.05. The preparation method comprises the following steps: adding a main metal salt solution, a metaborate solution and a precipitator solution into a reaction kettle for reaction, aging and drying to obtain the ternary positive electrode precursor, wherein the main metal salt is nickel salt, cobalt salt, manganese salt, magnesium salt and cerium salt. By selecting raw materials of boron, magnesium, cerium and a precipitator, co-precipitation of boron, magnesium, cerium and nickel cobalt manganese in a precursor stage is realized, and the boron, magnesium and cerium co-doped ternary positive electrode precursor with a stable structure is obtained. The battery finally prepared from the precursor has good cycle performance.

The invention discloses a preparation method of a lithium ion battery positive electrode material NCM811, which comprises the following steps: adding a metal nickel salt, a cobalt salt and a manganesesalt into deionized water according to a molar ratio of n(Ni):n(Co):n(Mn)=0.8:0.1:0.1, carrying out ultrasonic treatment, adding an ammonia water solution, adjusting the pH value, carrying out a heating reaction, and conducting filtering and drying to obtain a precursor; adding the precursor and a lithium source into a mortar, conducting grinding, putting the ground material into a tubular furnace, emptying air with nitrogen, introducing oxygen, conducting heating to a certain temperature, conducting cooling, conducting grinding with a mortar, conducting sieving with a 200-mesh sieve, addingthe sieved material into deionized water, adding sodium tartrate and alpha-cyclodextrin, conducting ultrasonic dissolving, transferring the dissolved material into a high-pressure reaction kettle, conducting reacting at a certain temperature, conducting filtering, putting filter residues into a tubular furnace, introducing oxygen, and conducing calcining and cooling to obtain the positive electrode material NCM811. The lithium ion battery positive electrode material NCM811 prepared by the invention has relatively high cyclic discharge capacity, and the performance structure is relatively stable and is not easy to attenuate in a cyclic use process.

The invention discloses a high-capacity single-crystal positive electrode material and a preparation method thereof, and the method comprises the following steps: (1) preparing high-nickel nickel-cobalt-manganese ternary precursor powders a and b, adding a parts of the powders into a titanium source, a zirconium source and a lithium source, and mixing to obtain mixed powder A; adding b parts of the powders into a magnesium source, a fluorine source and a lithium source, and mixing to obtain mixed powder B; (2) heating the mixed powder A, preserving heat, introducing oxygen atmosphere, cooling, crushing and screening to obtain single crystal powder D; and (3) fully mixing the single crystal powder D obtained in the step (2) and the mixed powder B obtained in the step (1), heating, preserving heat, introducing oxygen atmosphere, crushing and sieving to obtain a product F. According to the present invention, the two-time single crystal junction method is performed, the inner layer of the generated single crystal is extremely high nickel nickel cobalt lithium manganate so as to effectively improve the single crystal capacity, the outer layer is medium high nickel nickel cobalt lithium manganate so as to ensure the material stability, and the inner layer and the outer layer are doped with different elements so as to effectively improve the lithium ion diffusion rate in the single crystal and improve the capacity of the single crystal positive electrode material.

The invention discloses a high-nickel sodium ion positive electrode material, a preparation method thereof and a battery, the chemical formula of the high-nickel sodium ion positive electrode material is NaNiaCobMncO2. FCNP-Al/tMVOx, a + b + c = 1, and 0.5 < = alt; 1, 0lt; b is smaller than or equal to 0.25, and a/b is larger than or equal to 2.5, 0lt; c < = 0.3, 0lt; t is less than or equal to 0.1, 0lt; f is less than or equal to 0.1, and M is at least one of sodium, copper, zinc, zirconium or ammonium. The high-nickel sodium ion positive electrode material has good electrochemical performance, and application of the high-nickel sodium ion positive electrode material in batteries is facilitated.

The invention discloses a method for synthesizing a lithium metal oxide positive electrode material by employing a metal fluoride fluxing agent prepared with a plasma fluorination method. The invention belongs to the technical field of the lithium ion battery positive electrode material and electrochemistry, and particularly relates to the method for synthesizing the lithium metal oxide positive electrode material by employing the metal fluoride fluxing agent prepared with the plasma fluorination method. The invention aims to solve the problem that the lithium metal oxide positive electrode material commonly has poor cycling and rate performance, high production cost, and complex operation of the traditional modification method. The method disclosed by the invention comprises the steps of forming the metal fluoride fluxing agent with a co-doping effect on the surface of a lithium metal oxide precursor by employing the plasma fluorination method, and mixing and sintering the fluxing agent and a lithium source solid phase to obtain the lithium metal oxide positive electrode material. The high-efficiency energy-saving positive electrode material disclosed by the invention is used in a lithium ion battery.