Abstract: An electrochemical device, including a cathode, an anode and an electrolyte. The anode includes an anode current collector and an anode active material disposed on the anode current collector, the electrolyte includes fluoroethylene carbonate, and the electrochemical device meets the following relationship: 17.55?K1?K2?1.63K32+11.27K3?20.80, where K1 represents a specific surface area value of the unit mass of the anode active material (in m2/g), and 1.0?K1?2.0; K2 represents a content value of the fluoroethylene carbonate required by per Ah capacity (in g/Ah), and 0.05?K2?0.25; and K3 represents a weight value of the anode active material required by per Ah capacity (in g/Ah).

Abstract: An electrochemical device includes a positive electrode and an electrolytic solution. The positive electrode includes a positive current collector and a positive active material layer disposed on at least one surface of the positive current collector. The positive active material layer includes a positive active material. The positive active material contains an Mg element. Based on a total weight of the positive active material, a weight of the Mg element is X ppm, and 300?X?30000. The electrolytic solution contains carboxylate. Based on a total weight of the electrolytic solution, a weight percent of the carboxylate is Y %, and Y?60. The electrochemical device satisfies 5?X/Y?6000. The electrochemical device effectively improve the high-temperature cycle performance and low-temperature discharge performance of the electrochemical device by controlling a relationship between the electrolytic solution and the positive active material.

Abstract: An electrochemical device includes a positive electrode and an electrolytic solution. The positive electrode includes a positive current collector and a positive active material layer disposed on at least one surface of the positive current collector. The positive active material layer includes a positive active material. The positive active material contains an Mg element. Based on a total weight of the positive active material, a weight of the Mg element is X ppm, and 300?X?30000. The electrolytic solution contains carboxylate. Based on a total weight of the electrolytic solution, a weight percent of the carboxylate is Y %, and Y?60. The electrochemical device satisfies 5?X/Y?6000. The electrochemical device effectively improve the high-temperature cycle performance and low-temperature discharge performance of the electrochemical device by controlling a relationship between the electrolytic solution and the positive active material.

Abstract: An electrochemical apparatus includes a positive electrode and a non-aqueous electrolyte, where the positive electrode includes a positive electrode material layer disposed on at least one surface of a positive electrode current collector, the positive electrode material layer includes a lithium-containing transition metal composite oxide, and the lithium-containing transition metal composite oxide includes LixNazCo1-yMyO2, where 0.6<x<0.95, 0?y<0.15, 0<z?0.03, and M is at least one selected from a group consisting of Al, Mg, Ti, Mn, Fe, Ni, Zn, Cu, Nb, Cr, and Zr; and the non-aqueous electrolyte includes a compound of Formula I, a mass percentage of the compound of Formula I is A %, and 1?A/z?200.

Abstract: An electrochemical device includes a positive electrode, a negative electrode, a separator, and an electrolyte. The positive electrode includes a positive active material. The positive active material includes aluminum. Based on a mass of the positive active material, a mass percentage of the aluminum is x %. The electrolyte includes carboxylate and fluoroethylene carbonate. Based on a mass of the electrolyte a mass percentage of the carboxylate is m %, and a mass percentage of the fluoroethylene carbonate is n %. The electrochemical device satisfies: (1) x falls within a range of 0.01 to 1.00; and (2) 0.3?m/n?55, and preferably 5?m/n?16.

Abstract: A counterweight for an elevator system and an elevator system. The elevator system includes an elevator car and a counterweight connected to each other through a rope; the counterweight includes a counterweight frame and a plurality of counterweight blocks mounted on the counterweight frame, the counterweight frame includes a first main surface and a second main surface opposite to each other, the counterweight blocks are arranged between the first main surface and the second main surface; a first inverted arch beam and a second inverted arch beam connected to the first main surface and the second main surface respectively; and a load-bearing shaft connected between the first inverted arch beam and the second inverted arch beam; the counterweight is connected to the rope through the load-bearing shaft.

Abstract: An electrolyte includes a carboxylate ester compound and a norbornene anhydride compound. Based on a mass of the electrolyte, a mass percentage of the carboxylate ester compound is A % satisfying 5?A?45.

Abstract: An electrochemical device includes a negative electrode, a positive electrode, a separator, and an electrolyte. The positive electrode includes a positive electrode active material containing a doping element, where the doping element includes one or more selected from the group consisting of aluminum, magnesium, zirconium, titanium, and lanthanum; and based on a mass of the positive electrode active material, a mass percentage of the doping element is b %, where 0.01?b?3. The electrolyte includes a polynitrile additive.

Abstract: An electrochemical device, including a cathode, an anode and an electrolyte. The anode includes an anode current collector and an anode active material disposed on the anode current collector, the electrolyte includes fluoroethylene carbonate, and the electrochemical device meets the following relationship: 17.55?K1?K2?1.63K32+11.27K3?20.80, where K1 represents a specific surface area value of the unit mass of the anode active material (in m2/g), and 1.0?K1?2.0; K2 represents a content value of the fluoroethylene carbonate required by per Ah capacity (in g/Ah), and 0.05?K2?0.25; and K3 represents a weight value of the anode active material required by per Ah capacity (in g/Ah).

Abstract: An elevator system and a guiding device for use in an elevator system. The guide device for an elevator system includes: a bracket; a plurality of rollers mounted onto the bracket; at least one of the plurality of rollers is mounted onto the bracket through a damping device, the damping device includes: an oscillating rod, a first end of the oscillating rod is rotatably mounted onto the bracket, a second end of the oscillating rod is provided with a first notch, and the roller is mounted onto the oscillating rod; a guide pin, wherein the guide pin is mounted onto the bracket and passes through the first notch of the oscillating rod; and one or more friction members, mounted onto the oscillating rod and in frictional contact with the guide pin during the oscillation of the oscillating rod.

Abstract: An electrochemical device includes a positive electrode plate, a negative electrode plate and an electrolyte, where the positive electrode plate includes a positive electrode active material layer, and the negative electrode plate includes a negative electrode active material layer. Observed along a thickness direction of the electrochemical device, in a width direction of the negative electrode plate, the negative electrode active material layer includes two protruding regions not overlapping with the positive electrode active material layer on two sides, and a width M mm of the protruding region is 0.5 mm to 2 mm. The electrolyte includes a polynitrile compound, and the polynitrile compound includes a compound represented by formula I-A. Based on a mass of the electrolyte, a mass percentage N % of the polynitrile compound is 0.01% to 8%. 0.01?M×N<10.

Abstract: An electrochemical apparatus includes an electrolyte, a positive electrode, and a negative electrode. The negative electrode includes a negative active material layer, the negative active material layer includes a negative active material, the electrolyte includes fluoroethylene carbonate, and the electrochemical apparatus satisfies 0.005?A/B?0.1; where a mass of the fluoroethylene carbonate corresponding to 1 g of the negative active material is A g, and a specific surface area of the negative active material is B m2/g. This application aims to improve the fast charging performance of the electrochemical apparatus while maintaining the cycle performance thereof.

Abstract: An electrochemical apparatus includes an electrolyte solution comprising a compound of Formula I and a compound of Formula II wherein R1 is C1 to C10 alkyl, and R2 is halogenated C1 to C10 alkyl; and R21, R22, R23 and R24 are each independently fluorine, or unsubstituted or halogenated C1 to C3 alkyl, and at least one of R21, R22, R23 and R24 includes fluorine.

Abstract: An electrochemical apparatus includes an electrolyte solution comprising a compound of Formula I and a compound of Formula II wherein R1 is halogenated C1 to C10 alkyl and R2 is C1 to C10 alkyl; and R21, R22, R23, and R24 are each independently fluorine or unsubstituted or halogenated C1 to C3 alkyl, and at least one of R21, R22, R23, and R24 contains fluorine.

Abstract: An electrolyte solution, including fluorine-containing cyclic carbonate represented by Formula I and a first compound, where the first compound includes at least one of a compound of Formula II and a compound of Formula III and where based on a total mass of the electrolyte solution, a mass percent of the first compound is A %, and a mass percent of the fluorine-containing cyclic carbonate represented by Formula I is B %, where A and B satisfy: 40?A?80, and 3?A/B?11.

Abstract: An electrochemical apparatus includes a positive electrode, a negative electrode, a separator, and an electrolyte. The electrolyte includes a diluent, an electrolytic salt, and a compound of formula III. The diluent is selected from a group consisting of a compound of formula I and a compound of formula II. A molar mass of the diluent is Mz, and based on a total weight of the electrolyte, a percentage of the diluent is z wt %; a molar mass of the electrolytic salt is Mx, and based on the total weight of the electrolyte, a percentage of the electrolytic salt is x wt %; and a molar mass of the compound of formula III is My, and based on the total weight of the electrolyte, a percentage of the compound of formula III is y wt %, satisfying: 0.4 : 1 ? y M ? y : x M ? x ? 4 : 1 ; and z M ? z y M ? y + x M ? x ? 1.5 .

Abstract: An electrolyte of the electrochemical apparatus includes a linear carboxylate compound and a dinitrile compound. Based on total mass of the electrolyte, a mass percentage a of the linear carboxylate compound is 20% to 70% and a mass percentage b of the dinitrile compound is 0.01% to 7%; a bonding force between a negative electrode active material layer and a negative electrode current collector of a negative electrode plate is peeling strength, where the peeling strength F measured in N/m is 5 N/m to 20 N/m; and the mass percentage a of the linear carboxylate compound, the mass percentage b of the dinitrile compound, and the peeling strength F satisfy a relation 0.14?(100b+F)/100a?1.35.

Abstract: An electrochemical apparatus includes an electrolyte, a positive electrode and a negative electrode, the negative electrode includes a negative active material layer, the negative active material layer includes a negative active material, the electrolyte includes fluoroethylene carbonate, and the electrochemical apparatus satisfies the following relational expressions: 0.5<Rct/Rcp<1.5 and both Rct and Rcp are less than 35 milliohms, and 0.005?A/B?0.1; where Rct represents a charge transfer resistance under 50% state of charge at 25 degrees Celsius, and Rcp represents a concentration polarization resistance in the 50% state of charge at 25 degrees Celsius; a mass of the fluoroethylene carbonate corresponding to 1 g of the negative active material is A g, and a specific surface area of the negative active material is B m2/g. This application aims to improve the fast charging performance of the electrochemical apparatus while maintaining the cycle performance thereof.

Abstract: An electrochemical apparatus includes a positive electrode and an electrolyte. The electrolyte includes ethylene carbonate (EC), propylene carbonate (PC), and succinonitrile (SN). The positive electrode includes a positive electrode active material, where the positive electrode active material includes metal element A, and the metal element A includes at least one of the following elements: Mg, Zr, or Al. Based on a mass of the electrolyte, a mass percentage of SN is a %, a mass percentage of EC is b %, and a mass percentage of PC is c %, where k=b/c, 1.25?k?6, and a/k?0.2. Based on a mass of the positive electrode active material, a mass percentage of the metal element A is x %, where 0.01?x?1. The foregoing electrochemical apparatus exhibits excellent high-temperature cycling performance and high-temperature interval cycling performance.

Abstract: An electrochemical device includes a positive electrode plate and an electrolyte. The positive electrode plate includes a positive active material layer. The positive active material layer includes a positive active material and a positive electrode additive. The positive electrode additive includes at least one of lithium titanium aluminum phosphate, lithium lanthanum titanium oxide, lithium lanthanum tantalum oxide, lithium aluminum germanium phosphate, lithium lanthanum zirconium oxide, niobium-doped lithium lanthanum zirconium oxide, or tantalum-doped lithium lanthanum zirconium oxide. The electrolyte includes a compound represented by Formula (I). Based on a mass of the positive active material layer, a mass percent of the positive electrode additive is p %, satisfying: 0.1?p?1.2. Based on a mass of the electrolyte, a mass percent of the compound represented by Formula (I) is q %, satisfying: 0.1?q?12.