Abstract: The present application provides a negative electrode active material, a process, a battery, a battery module, a battery pack and an apparatus related to the same. The negative electrode active material comprises a core material and a polymer modified coating on at least a part of a surface of core material; wherein the core material is one or more of a silicon-based negative electrode material and a tin-based negative electrode material; the negative electrode active material has a weight loss rate satisfying 0.2%?weight loss rate?2% in a thermogravimetric analysis test wherein temperature is elevated from 25° C. to 800° C. under a non-oxidizing inert gas atmosphere. The present application can reduce damage to the surface structure of the negative electrode active material, reduce loss of active ions and capacity, meanwhile can well improve coulomb efficiency and cycle performance of the battery.

Abstract: A modified high-nickel ternary positive electrode material includes an inner core and inner and outer coating layers. The inner core includes a high-nickel ternary positive electrode material matrix, the matrix being doped with M1, M2, and W. M1 is one of Mo, Zr, Ti, Sb, Nb, and Te. M2 is one of Mg, Al, Ca, Zn, and Sr. Chemical formula of the high-nickel ternary positive electrode material matrix is Li1+a[NixCoyMnzM1bM2cWd]O2. 0.65?x<1, 0?y<0.3, 0?z<0.3, 0<a<0.2, 0<b<0.1, 0<c<0.1, 0<d<0.1, x+y+z+b+c+d=1. A surface layer of the inner core is further doped with Co. The inner coating layer is a Co-containing compound. The outer coating layer includes an Al-containing compound and a B-containing compound.

Abstract: A method for preparing lithium bis(fluorosulfonyl)imide includes a synthesis step, an evaporation step, an extraction step, an alkalinization step, a dehydration step, and a desolventization step.

Abstract: The present application provides a method for preparing lithium bis(fluorosulfonyl)imide, which may include the following steps: (a) a synthesis step; (b) an evaporation step; (c) an extraction step; (d) an alkalinization step; (e) a dehydration step; (f) a desolventization step; (g) a crystallization step; and (h) a drying step; lithium bis(fluorosulfonyl)imide prepared by the method, an electrolytic solution containing the lithium bis(fluorosulfonyl)imide, and a secondary battery thereof.

Abstract: A method for preparing lithium bis(fluorosulfonyl)imide, including (1) adding an organic solvent and an absorbent A to a reaction kettle, then adding part of an ammonia source, and finally adding SO2X2 and a remaining ammonia source simultaneously for reaction, to obtain a solution of a salt (SO2F—NH—SO2F)·A containing bis(fluorosulfonyl)imide and the absorbent A, where in the SO2X2, X is independently fluorine or chlorine; (2) performing filtration, concentration and washing on the solution obtained in step (1) to obtain a purified salt (SO2F—NH—SO2F)·A of the bis(fluorosulfonyl)imide and the absorbent A; (3) adding a lithium source to the purified salt (SO2F—NH—SO2F)·A of the bis(fluorosulfonyl)imide and the absorbent A obtained in step (2) for reaction to obtain a solution containing lithium bis(fluorosulfonyl)imide; and (4) performing dehydration, concentration, crystallization with a non-aqueous poor solvent, and drying on the solution obtained in step (3) to obtain the lithium bis(fluorosulfonyl)imide i

Abstract: A battery cell, a battery module, a battery pack, and an electrical apparatus are provided. The battery cell includes an intermediate portion and side portions located on two sides of the intermediate portion in a thickness direction, the intermediate portion comprising m battery cell sub-units and the side portions comprising n battery cell sub-units, where m+n is an integer greater than or equal to 3. Each of the battery cell sub-units comprises a positive electrode sheet, a negative electrode sheet and a separator arranged between the positive electrode sheet and the negative electrode sheet, and each of the m battery cell sub-units has a dry battery cell nail penetration short-circuit resistance greater than that of each of the n battery cell sub-units.

Abstract: A battery pack and an electrical device including the same are described. The battery pack includes a battery cell at least partially immersed in a refrigerant; a case for accommodating the battery cell and the refrigerant and provided with an outlet and an inlet for the refrigerant; a circulating pipeline located outside the case, connecting the outlet and the inlet for the refrigerant to form a closed system; a heat exchanger and a condenser located on the circulating pipeline; a pressure measuring module provided with one end arranged inside the case and configured for detecting an internal pressure of the case; a temperature monitoring device for detecting a temperature of the battery cell and a fluorine-containing cooling medium in real time; and a battery control module for managing the battery cell; where the refrigerant includes at least a first fluorine-containing cooling medium and a second fluorine-containing cooling medium.

Abstract: The present application provides a positive electrode active material, a preparation method therefor, a positive electrode plate, a secondary battery and a power consuming device containing same. The positive electrode active material has a core-shell structure, including an inner core and a coating layer coating at least a part of the inner core, wherein the inner core has a chemical formula of LiaAxMn1-yByP1-zCzO4-nDn, and the coating layer comprising a polymer which comprises one or more of plant polysaccharide, marine polysaccharide and their respective derivatives. The positive electrode active material of the present application enables a secondary battery to have a high energy density as well as significantly improved rate performance, cycling performance and/or high-temperature stability.

Abstract: A positive electrode current collector and a positive electrode plate, a battery, a battery module, a battery pack, and an apparatus including the positive electrode current collector are provided. In some embodiments, a positive electrode current collector is provided, including an organic support layer and an aluminum-based conductive layer disposed on at least one surface of the organic support layer, where the aluminum-based conductive layer contains Al and at least one modifying element selected from O, N, F, B, S, and P, an XPS spectrogram of the aluminum-based conductive layer with a surface passivation layer removed through etching has at least a first peak falling in a range of 70 eV to 73.5 eV and a second peak falling in a range of 73.5 eV to 78 eV, and a ratio x of peak intensity of the second peak to that of the first peak satisfies 0<x?3.0.

Abstract: The present application provides a method of preparing sulfuryl fluoride, including the following steps of: S1) reacting sulfur trioxide steam with barium fluoride to acquire a mixed gas of barium sulphate and sulfuryl fluoride; S2) pickling the mixed gas acquired in step S1 with a concentrated sulfuric acid solution with a concentration of 70-98.3 wt. % to acquire a primary purified sulfuryl fluoride gas; S3) passing the primary purified sulfuryl fluoride gas acquired in step S2 through an aqueous solution with a concentration of 2-10 wt. % selected from at least one of the following: sodium sulfite, sodium bisulfite, sodium pyrosulfite, and sodium thiosulfate, to acquire a sulfuryl fluoride gas.

Abstract: A positive electrode active material has a core-shell structure, which includes an inner core and a coating layer coating at least part of the inner core. The inner core has a chemical formula of LiaAxMn1-yByP1-zCzO4-nDn, and the coating layer includes a polymer which includes one or more selected from polysiloxanes with linear structure and polysiloxanes with ring structure.

Abstract: A positive electrode active material and a preparation method therefor, a positive electrode plate containing same, a secondary battery, and a power consuming device are provided. The positive electrode active material has a core-shell structure, comprising an inner core and a shell coating the inner core, wherein the inner core comprises Li1+xMn1?yAyP1?zRzO4, and the shell comprises a first coating layer coating the inner core, and a second coating layer coating the first coating layer, and a third coating layer coating the second coating layer. The positive electrode active material of the present application enables the secondary battery to have a higher energy density, and a good rate performance, cycling performance and safety performance.

Abstract: A positive current collector, a secondary battery, and an electrical device are provided. In some embodiments, the positive current collector includes: a support layer; and a conductive layer located on at least one surface of the support layer, where the conductive layer includes a first metal portion configured to connect to a tab, where, along a thickness direction of the conductive layer, the first metal portion includes at least three sublayers, and melting points of the at least three sublayers rise stepwise in ascending order of distance from the support layer. In the embodiments of this application, the first metal portion includes at least three sublayers, and the melting points of the at least three sublayers rise stepwise in ascending order of distance from the support layer, thereby helping increase a bonding force between the conductive layer and the support layer and reducing the probability of peel-off and delamination between the layers.

Abstract: A positive electrode active material has a core-shell structure including an inner core and a shell coating the inner core. The inner core has a chemical formula of Li1+xMn1?yAyP1?zRzO4. The shell includes a first coating layer coating the inner core, a second coating layer coating the first coating layer, a third coating layer coating the second coating layer, and a fourth coating layer coating the third coating layer.

Abstract: This application provides a current collector and a preparation method thereof, a secondary battery containing such current collector, a battery module, a battery pack, and an electric apparatus. The current collector in this application includes a support layer, a binder layer, and a metal layer, where the binder layer is arranged between the support layer and the metal layer, the binder layer includes an organic binder and inorganic particles, a thickness D0 of the binder layer is 1.0-5.0 ?m, optionally 1.0-3.0 ?m; and the inorganic particles include large particles with a median particle size D50large and small particles with a median particle size D50small, and the median particle sizes of the large particles and the small particles satisfy the following relationships: D50large>D50small; D50large=(0.5-0.9)×D0; and D50small=(0.1-0.4)×D0.

Abstract: A positive current collector, a secondary battery, and an electrical device are provided. In some embodiments, the positive current collector includes: a support layer; and a conductive layer located on at least one surface of the support layer, where the conductive layer includes a first metal portion configured to connect to a tab, where, along a thickness direction of the conductive layer, the first metal portion includes at least three sublayers, and melting points of the at least three sublayers rise stepwise in ascending order of distance from the support layer. In the embodiments of this application, the first metal portion includes at least three sublayers, and the melting points of the at least three sublayers rise stepwise in ascending order of distance from the support layer, thereby helping increase a bonding force between the conductive layer and the support layer and reducing the probability of peel-off and delamination between the layers.

Abstract: The present application discloses a composite graphite material, a secondary battery, an apparatus and a preparation method thereof. The composite graphite material includes a core material and a coating layer coating at least a part of the surface of the core material, the core material including graphite; wherein the absolute value K of zeta potential of the composite graphite material in deionized water with a pH of 7 is at least 20 mV. The use of the composite graphite material provided by the present application can improve the cohesion and bonding force of the negative electrode plate, thereby reducing the cyclic expansion of the secondary battery.

Abstract: A positive electrode current collector and a positive electrode plate, a battery, a battery module, a battery pack, and an apparatus including the positive electrode current collector are provided. In some embodiments, a positive electrode current collector is provided, including an organic support layer and an aluminum-based conductive layer disposed on at least one surface of the organic support layer, where the aluminum-based conductive layer contains Al and at least one modifying element selected from O, N, F, B, S, and P, an XPS spectrogram of the aluminum-based conductive layer with a surface passivation layer removed through etching has at least a first peak falling in a range of 70 eV to 73.5 eV and a second peak falling in a range of 73.5 eV to 78 eV, and a ratio x of peak intensity of the second peak to that of the first peak satisfies 0<x?3.0.

Abstract: The present invention relates to an electrode active material, a preparation method thereof, an electrode, a battery, and an apparatus. The electrode active material includes: a core and a coating layer, where the core includes a ternary material, the coating layer coats the core, the coating layer includes a reaction product of a sulfur-containing compound and a lithium-containing compound, and the reaction product includes element Li, element S, and element O.

Abstract: The present application provides a negative electrode active material, a process for preparing the same, and a secondary battery, a battery module, a battery pack and an apparatus related the same. The negative electrode active material comprises a core material and a polymer-modified coating layer on at least a part of a surface of the core material, the core material is one or more of a silicon-based negative electrode material and a tin-based negative electrode material, the polymer-modified coating layer comprises sulfur element and carbon element, the sulfur element has a mass percentage of from 0.2% to 4% in the negative electrode active material, the carbon element has a mass percentage of from 0.5% to 4% in the negative electrode active material, and the polymer-modified coating layer comprises a —S—C— bond.