Abstract: Provided are an electrolyte, a secondary battery, a battery module, a battery pack and a power consuming device. The electrolyte of the present application comprises a first additive, wherein the first additive is a sulfur-containing compound with a boiling point not exceeding 70° C. under a standard atmospheric pressure, and the mass content of the first additive in the electrolyte is 0.05%-6%. The electrolyte of the present application can form a stable interface film on the surface of the negative electrode plate, which inhibits side reactions between the electrolyte and the negative electrode plate, thereby reducing the interface impedance of the negative electrode, reducing the precipitation of sodium, and improving the cycle performance and safety performance of the secondary battery.

Abstract: This application provides a compound of formula (I), formula (II), or formula (III). The compound has good adsorption ability on the surface of a metal and a substance containing metal ions, and when applied to secondary batteries, can help improve cycling performance and service life of the secondary batteries.

Abstract: This application provides a compound of formula (I) that has good adsorption ability on the surface of a metal and a substance containing metal ions, and that, when applied to secondary batteries, can help improve cycling performance and service life of the secondary batteries. This application further provides a secondary battery, a battery module, a battery pack, an electric apparatus, and a preparation method thereof.

Abstract: An electrolyte solution for a sodium-ion secondary battery is described. By matching a first additive of a low-boiling-point sulfur-containing compound and a second additive of an oxalate-containing salt (a compound of formula (I)) and/or an oxalate ester (a compound of formula (II)) in the electrolyte solution, stable interface passive films are formed on a positive electrode and a negative electrode, such that the self-discharge rate and the cycling performance of the battery are improved, and meanwhile, the battery has a good power performance. The present application further relates to a sodium-ion secondary battery comprising the electrolyte solution, a battery module, a battery pack, and a power consuming device.

Abstract: An electrolyte for secondary batteries includes an electrolyte salt, an organic solvent, and an additive, where the additive includes an amine compound and a sulfur-containing compound with a boiling point not greater than 70° C., where a mass percentage of the sulfur-containing compound in the electrolyte is 0.06% to 8%, optionally 0.08% to 6%, and a mass ratio of the sulfur-containing compound to the amine compound is 1:(0.08-13), optionally 1:(0.1-11), or further optionally 1:(0.5-2.5).

Abstract: A secondary battery in which at least one of a positive electrode active material layer and a negative electrode active material layer includes a silicate multi-metal salt is disclosed. A chemical formula of the silicate multi-metal salt is at least one selected from YSi2Z1Z2O8 and X1X2Si2Z1Z2O8, Y is selected from second main group elements, X1 and X2 are each independently selected from first main group elements, and Z1 and Z2 are each selected from third main group elements.

Abstract: The present application provides a secondary battery, and providing a battery module, a battery pack, and a powder device comprising the same. The secondary battery includes a positive electrode plate and a non-aqueous electrolytic solution, in which the positive electrode plate includes a positive electrode active material having a core-shell structure, the positive electrode active material includes an core and a shell covering the core, the core includes Li1+xMn1?yAyP1?zRzO4, the shell includes a first coating layer covering the core and a second coating layer covering the first coating layer, the non-aqueous electrolytic solution includes a first additive one or more selected from the compounds shown in formulae 1-A to 1-D. The secondary battery of the present application can have a relatively high energy density, and also a good rate performance, cycling performance, storage performance and safety performance.

Abstract: This application provides a secondary battery, and providing a battery module, a battery pack, and a powder device comprising the same. The secondary battery includes a positive electrode plate and a non-aqueous electrolytic solution, in which the positive electrode plate includes a positive electrode active material having a core-shell structure, said positive electrode active material includes an inner core and a shell covering the core, said core has a chemical formula of Li1+xMn1-yAyP1-zRzO4, said shell includes a first coating layer covering said core, a second coating layer covering said first coating layer, and a third coating layer covering said second coating layer. The secondary battery of the present application can have a relatively high energy density, and also a good rate performance, cycling performance, storage performance and safety performance.

Abstract: This application relates to a secondary battery including a silicate ester and/or a derivative thereof, where the silicate ester and/or the derivative thereof includes a structure in a cyclic or non-cyclic structure or a structure in a cyclic structure. This application further relates to a battery pack including the secondary battery and an electric apparatus including the secondary battery or the battery pack.

Abstract: The present application provides a secondary battery and an electrical apparatus containing the same. The secondary battery includes a positive electrode sheet, a negative electrode sheet, a separator disposed between the positive electrode sheet and the negative electrode sheet, and an electrolyte solution, wherein the separator includes a substrate and an inorganic and/or organic particle layer disposed on at least one surface of the substrate, and the separator further includes an acid scavenging additive located among the inorganic and/or organic particles of the inorganic and/or organic particle layer or located in a form of a separate layer between the substrate and the inorganic and/or organic particle layer, wherein the maximum dissolution amount of the acid scavenging additive in the electrolyte solution at 25° C. is less than 1% by mass relative to the mass of the electrolyte solution.

Abstract: A secondary battery includes an additive. The structure of the additive is R1—X—R0, where X is one of carbon, nitrogen, silicon, phosphorus, and sulfur; R0 includes one or two non-polar groups; and R1 is a polar chain group or a polar cyclic group, where the chain group includes one or more of double bond, triple bond, and silicon-oxygen bond, and the cyclic group includes one or more of three-membered heterocycle, four-membered heterocycle, five-membered heterocycle, and six-membered heterocycle.

Abstract: An electrolyte includes a solvent, an additive composition, and a lithium salt. The additive composition includes a compound of formula I and at least one of compounds of formula LI and formula III. In the formulas, the symbols are as defined in the specification.

Abstract: A secondary battery includes a negative electrode plate including a negative electrode material layer, a positive electrode plate including a positive electrode material layer, and an electrolytic solution. At least one of the negative electrode material layer, the positive electrode material layer and the electrolytic solution contains an interface passivator, and the interface passivator is a compound containing an element E selected from lithium, sodium, beryllium, magnesium, potassium, calcium, aluminum, gallium, or germanium.

Abstract: This application provides a lithium-ion battery, including: an electrode assembly and an electrolytic solution. The electrolytic solution may comprise a first lithium salt LixR1(SO2N)xSO2R2, wherein R1 and R2 each independently represent an alkyl with 1 to 20 fluorine atoms or carbon atoms, or a fluoroalkyl with 1 to 20 carbon atoms, or a fluoroalkoxyl with 1 to 20 carbon atoms, and x is an integer of 1, 2, or 3, and a second lithium salt, wherein the second lithium is at least one selected from LiPF6, LiAsF6, or LiBF4, wherein a thickness of the metallic conductive layer, ?1, is in a range of 0.52 ?m to 2.4 ?m, and a mass percentage of the first lithium salt, w, is 5% to 30% based on a total mass of the electrolytic solution.

Abstract: The present disclosure relates to a method and system for multi-source algae image target detection, and relates to the field of monitoring of algal bloom events in fresh water. The method includes first crawling images of algae of a selected species by using a built automated algae crawling tool, where the images include all formats; classifying and labeling algae in the algae images, and forming a source domain dataset by using all the classified and labeled algae images; performing transfer learning by using a faster recurrent revolutional neural network (Faster RCNN) with reference to a target domain dataset, to obtain a multi-source algae image target detection model; and finally performing identification and classification by using the multi-source algae image target detection model.

Abstract: A lithium-ion secondary battery is provided, where an electrolyte solution of the lithium-ion secondary battery comprises a highly heat-stable salt (My+)x/yR1(SO2N?)xSO2R2, where the My+ is a metal ion, R1 and R2 are each independently a fluorine atom, an alkyl with 1-20 carbon atoms, a fluoroalkyl with 1-20 carbon atoms, or a fluoroalkoxy with 1-20 carton atoms, x is 1, 2, or 3, and y is 1, 2, or 3. A mass percent of the salt in the electrolyte solution is set as k2%; a temperature rise coefficient k1 of the positive electrode sheet satisfies 2.5?k1?32, where k1=Cw/Mc, Cw is a positive electrode material load per unit area (mg/cm2) on the surface of any side of the positive electrode current collector on which a positive electrode material layer is loaded, and Mc is a carbon content (%) of the positive electrode material layer; and the lithium-ion secondary battery satisfies 0.34?k2/k1?8.

Abstract: A secondary battery contains cyclic siloxane and/or ring-opening polymerization derivative thereof, where a cyclic structure of the cyclic siloxane has at least one structure, one and only one of R1 and R2 contains a group with stronger electron withdrawing property than phenyl, and the group is directly linked to Si.

Abstract: The present disclosure provides a fast charge long lifetime secondary battery, a battery module, a battery pack, and a power consumption device. In some embodiments, a secondary battery, comprising an electrode assembly and an electrolytic solution, the electrode assembly comprises a positive electrode plate, a negative electrode plate, and a separator, the positive electrode plate comprises a positive electrode tab, and the negative electrode plate comprises a negative electrode tab are provided. In those embodiments, the positive electrode tab has the following temperature rise coefficient: ? = C 1 ? 0 ? S ? 1 where S1 is a total cross-sectional area of the positive electrode tab, in unit of mm2; C is capacity of the electrode assembly, in unit of A·h; the electrolytic solution contains a heat stable salt and an additive that inhibits decomposition of the lithium salt.

Abstract: This application relates to a secondary battery including an electrolyte and a positive electrode plate, where the electrolyte may include a compound represented by formula (I): The positive electrode plate may include a positive electrode active material, where a surface residual lithium content of the positive electrode active material may be 20 ppm to 2,000 ppm.

Abstract: An electrochemical device includes a positive electrode plate and an electrolyte solution. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer provided on at least one surface of the positive electrode current collector. The positive electrode active material layer contains a positive electrode lithium supplement including one or more of Li2M1O2, Li2M2O3, Li3M3O4, Li5M4O4, and Li6M5O4. M1 includes one or more of Ni, Co, Fe, Mn, Zn, Mg, Ca, and Cu. M2 includes one or more of Mn, Sn, Mo, Ru, and Ir. M3 includes one or more of V, Nb, Cr, and Mo. M4 includes one or more of Fe, Cr, V, and Mo. M5 includes one or more of Co, V, Cr, and Mo. The electrolyte solution contains a lithium salt. A molarity A of the lithium salt satisfies 1.5 mol/L?A?4 mol/L.