Abstract: An electrochemical apparatus includes an electrolyte, a positive electrode plate, a negative electrode plate, and a separator. The separator is disposed between the positive electrode plate and the negative electrode plate. The separator includes a substrate and a first coating provided on both surfaces of the substrate. The first coating includes polymer particles. In an 11.5 ?m×7.5 ?m region of a surface of the first coating, a quantity Q of the polymer particles is 10 to 90. The electrolyte includes substituted or unsubstituted C3-C8 linear carboxylate, and in a case of substitution, a substituent group is selected from halogen atoms. A mass percentage B of the linear carboxylate is 5% to 50% based on a mass of the electrolyte.

Abstract: An electrode assembly is disposed within the housing and includes a first electrode plate, a second electrode plate, and a separator disposed between the first electrode plate and the second electrode plate. Along the first direction, a projection of the second electrode plate is within a projection of the first electrode plate, the projection of the first electrode plate is within a projection of the separator, and the projection of the separator is within a projection of the accommodating space. Along a direction perpendicular to the first direction, the separator extends beyond the first electrode plate, and an end of a portion of the separator extending beyond the first electrode plate, together with the housing enclose a first region, a width of the first region is W1, wherein W1>0.

Abstract: An electrochemical device, including a positive electrode, a negative electrode, a separator, 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. A volume of the positive active material layer is V1 cm3. A true volume of the positive active material is V2 cm3, and 0.8?V2/V1?0.92. The positive active material layer possesses a relatively high packing efficiency and density, and can store more energy under a condition that the volume is constant, and reduce a space in which the electrolytic solution infiltrates the positive active material, thereby reducing reactions between a positive electrode material and the electrolytic solution, improving the cycle performance of the electrochemical device under a high voltage and a high temperature.

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 device includes a housing assembly and an electrode assembly accommodated in the housing. The housing assembly includes a housing and a cover. The housing includes a bottom wall and a sidewall. One end of the sidewall is connected to the bottom wall, and another end of the sidewall extends away from the bottom wall. The bottom wall and the sidewall jointly define an accommodation cavity. The cover is fitted onto the other end of the sidewall and covers the accommodation cavity. A direction from the bottom wall to the cover is a first direction. The electrode assembly includes a first electrode plate, a second electrode plate, and a separator. The first electrode plate includes at least one first electrode plate unit. The second electrode plate includes at least one second electrode plate unit.

Abstract: A positive electrode additive includes a structure shown in Formula I. In Formula I, R1 and R2 are respectively independently selected from C2-C18 alkyls. When the positive electrode additive is applied to the preparation of a positive electrode plate of a lithium ion battery, the flexibility of the electrode plate can be significantly improved, the risk of brittle failure of the electrode plate in the winding process due to the hardness and brittleness can be avoided, and the P.D of the electrode plate can be increased, thereby increasing the energy density of the lithium ion battery.

Abstract: An anode including a current collector and an anode active material layer disposed on the current collector are provided. The anode active material layer includes first oriented particles having a first tilt angle ?1 inclined with respect to the direction parallel to the current collector, and second oriented particles having a second tilt angle ?2 inclined with respect to the direction parallel to the current collector. The first tilt angle ?1 and the second tilt angle ?2 are different and both not greater than 70°.

Abstract: A negative electrode includes silicon-based particles and graphite particles, where a quantity of graphite particles present within a vertical distance of about 0 to 6 ?m to respective edges of the silicon-based particles is N, and based on a total quantity of the silicon-based particles, more than about 50% of the silicon-based particles satisfy: 6?N?17. The negative electrode has good cycle performance, and a battery prepared by using the negative electrode has good rate performance and a low deformation rate.

Abstract: An electrochemical device, including an electrode assembly. The electrode assembly is of a winding structure, including a first electrode plate, a second electrode plate, and a separator disposed between the first electrode plate and the second electrode plate. The first electrode plate includes a first current collector and a first active material layer, the first current collector includes a first uncoated foil zone. The second electrode plate includes a second current collector and a second active material layer, the second current collector includes a second uncoated foil zone. The electrochemical device further includes a bonding member, the bonding member includes a bonding layer and a metal layer stacked together, the bonding layer includes a conductive material, and the bonding member is bonded to at least one of the first uncoated foil zone or the second uncoated foil zone through the bonding layer.

Abstract: An electrochemical device, including a cathode, an anode and an electrolyte, wherein the anode includes an anode active material layer, wherein the contact angle of the anode active material layer relative to a non-aqueous solvent is not greater than 60° as measured by a contact angle measurement. The electrochemical device of the present application has improved cycle performance.

Abstract: A negative active material includes a silicon-based composite material. The silicon-based composite material includes a silicon substrate, a conductive agent and a polymer. The conductive agent and the polymer are disposed on at least a portion of a surface of the silicon substrate. The silicon-based composite material has a powder conductivity from 0.03 S/cm to 0.1 S/cm.

Abstract: An electrolyte solution includes a compound represented by Formula I: where m, n, k, and x are each independently selected from 1, 2, or 3; R11 and R12 are each independently selected from hydrogen, halogen, substituted or unsubstituted C1 to C3 alkyl, substituted or unsubstituted C2 to C4 alkenyl, substituted or unsubstituted C2 to C4 alkynyl, or substituted or unsubstituted C6 to C10 aryl, wherein when substituted, a substituent is independently selected from halogen. The multi-cyano (—CN) compound represented by Formula I is introduced into the electrolyte solution, so that the multi-cyano group can stabilize a transition metal in a positive active material and protect a positive electrode interface. The compound represented by Formula I can also be reduced at a negative electrode to protect a negative electrode interface and play a role in suppressing continuous decomposition of the electrolyte solution and suppressing gas production.

Abstract: A battery includes a first battery cell and a second battery cell, a buffer member, and a temperature collection member provided in a stacked manner; the buffer member is provided between the first battery cell and the second battery cell and/or is provided on a side of the first battery cell away from the second battery cell; the temperature collection member is provided between the first battery cell and the buffer member for collecting a temperature of the first battery cell; the temperature collection member is of a sheet structure, and a thickness direction of the temperature collection member is parallel to a stacking direction of the first battery cell and the second battery cell.

Abstract: An electrochemical device includes a housing, an electrode assembly, a plate-shaped member and a cover body. The housing has an accommodating cavity and a first wall covering the accommodating cavity. The plate-shaped member is disposed between the first wall and the electrode assembly and includes a second opening. The cover body includes a cover portion and a protruding portion extending into the accommodating cavity. In a second direction, the plate-shaped member includes a first portion and a second portion connected to the first portion and extending in a direction deviating from the second direction, and the second portion surrounds the protruding portion to form a second edge. In the first direction, a distance between the first portion and the cover portion is a first distance, and a distance between the second edge and the cover portion is a second distance, the first distance being different from the second distance.

Abstract: An electrochemical device includes a cathode including a cathode current collector, a first cathode active material layer including a first cathode active material, and a second cathode active material layer including a second cathode active material. The first cathode active material layer is disposed between the cathode current collector and the second cathode active material layer, and the first cathode active material layer is formed on at least one surface of the cathode current collector. The first cathode active material layer is firstly formed on the cathode current collector, and the second cathode active material layer is secondly formed on the first cathode active material layer, then the second cathode active material layer and the first cathode active material layer are pressed together.

Abstract: An electrochemical device including a positive electrode, a negative electrode, and an electrolytic solution. The negative electrode includes a negative current collector and a negative active material layer formed on the negative current collector. The negative active material layer contains a negative active material. A conductive material is disposed between the negative active material layer and the negative current collector. An average particle diameter of the conductive material is smaller than that of the negative active material. The negative active material layer possesses a specific weight. The electrochemical device improves high-temperature cycle expansion performance and overcharge protection performance.

Abstract: An electrochemical device, including a cathode, an anode and an electrolytic solution. The anode includes a carbon material and hydroxyalkyl methylcellulose. The electrolytic solution includes propionate and an additive. The additive is one or more selected from the group consisting of a fluorocarbonate, a carbon-carbon double bond-containing ethylene carbonate, a sulfur-oxygen double bond-containing compound, a compound having 2-4 cyano groups, a cyclic carboxylate, a cyclic phosphoric anhydride, a carboxylic anhydride, a sulfonic anhydride and a carboxylic sulfonic anhydride.

Abstract: An protective member is configured to be attached to an innermost curved portion of an electrode plate assembly having a wound structure in the electrochemical apparatus. The protective member includes a first substrate layer, a first adhesive layer, and a thickened layer. The first adhesive layer is disposed on a surface of the first substrate layer, and the first adhesive layer is configured to be adhered to the electrode plate assembly. The thickened layer is disposed on a surface of the first substrate layer facing away from the first adhesive layer, and the thickened layer is configured to be soluble in an electrolyte.

Abstract: An electrochemical device, including a cathode, an anode and an electrolytic solution. The anode includes a carbon material and hydroxyalkyl methylcellulose. The electrolytic solution includes propionate. The electrolytic solution further includes one or more of the following: LiPF6, LiBF4, LiPO2F2, LiSbF6, LiAsF6, LiC4F9SO3, LiClO4, LiB(C2O4)2, or LiN(CxF2x+1SO2)(CyF2y+1SO2). x and y are integers from 1-5.

Abstract: A negative electrode plate, a secondary battery, and an electronic apparatus are provided. The negative electrode plate includes a metal foil, a first conductive coating, and a first active material layer. The metal foil includes a first surface. The first conductive coating is applied on the first surface. The first active material layer is disposed on a surface of the first conductive coating facing away from the first surface. A thickness of the first conductive coating is h, and ten-point average roughness of the first surface is Rz1, satisfying 0.5?Rz1/h?0.8.