Abstract: Disclosed is a battery. The battery includes a positive electrode plate, a negative electrode plate, a non-aqueous electrolyte solution, and a separator. An electrolyte additive includes fluoroethylene carbonate. A termination tape of the positive electrode plate is disposed at a paste coating tail of the positive electrode plate. An area of a termination tape of the positive electrode plate is A cm2, a content of fluoroethylene carbonate is B2 wt %; and a width of the positive electrode plate is C cm; wherein a ratio of A to B2 is in a range of 0.5-5 and a ratio of A to C is in a range of 1 to 3. The termination tape includes a substrate and a (meth)acrylic acid termination adhesive layer coated on a surface of the substrate. The battery can effectively improve high-temperature performance.

Abstract: Disclosed are an electrolyte solution and a lithium-ion battery. The electrolyte solution includes a first additive, a second additive, and a third additive; the first additive includes a silane compound; the second additive includes a polycyclic compound; the third additive includes lithium difluoro(oxalato)borate. Through synergistic interactions between additives, the electrolyte solution enhances cell and safety performance while maintaining long cycle life and low-expansion performance.

Abstract: A battery includes a positive electrode plate, a negative electrode plate, and an electrolyte solution. The negative electrode plate includes a negative electrode current collector including a copper foil and a negative electrode active material layer including a negative electrode active material which including a silicon-based active material, the electrolyte solution includes lithium bis(trifluoromethanesulfonyl)imide; and the battery satisfies following relationship: B?10A?C/10+3?0; A is a grain size of copper foil, in a unit of ?m; B is a mess percentage of lithium bis(trifluoromethanesulfonyl)imide in the electrolyte solution, in a unit of wt %; C is a mass percentage of the silicon-based active material in the negative electrode active material, in a unit of wt %, and C?50. The battery may significantly alleviate silicon negative electrode expansion while enhance the kinetic performance and cycling stability of the battery under room-temperature.

Abstract: A negative electrode active material comprises silicon-carbon composite particles. The silicon-carbon composite particles have closed pores, and the volume fraction of the closed pores is 4%-50%. The silicon-carbon composite particles have a core-shell structure with a shell thickness of t, where 0<t?10 nm. The silicon-carbon composite particles have a first region and a second region on a cross section. The content of silicon element in the first region is c1, the content of silicon element in the second region is c2, and 0.15?c2/c1?1.4; where the dimension of the perpendicular line to the tangent line at any point on the edge of the cross section is L on the cross section, and on the perpendicular line, a region 0.001 L-0.1 L away from the edge constitutes the first region, and a region 0.1 L-0.5 L away from the edge constitutes the second region.

Abstract: A battery includes: a housing having a cavity; a battery cell arranged in the cavity, the battery cell including a positive electrode plate, a negative electrode plate, and a separator; and an electrolyte solution filled in the battery cell including fluoroethylene carbonate. A width of the separator is greater than that of the positive and the negative electrode plate. The battery satisfies following relationship: C?B/20A+1, where a content of fluoroethylene carbonate in the electrolyte solution is C %, A represents a distance between an edge of the separator and that of an electrode plate on the same side, and B represents a height of the cavity. When the foregoing relationship is satisfied, deterioration of performance of the battery cell caused by insufficient electrolyte solution may be alleviated, thereby improving a value of a self-discharge coefficient k and cycling performance of the battery.

Abstract: A positive electrode piece and a secondary battery including the same. By selecting a type of polymer electrolyte prepared from a polymer different from that in the prior art as the solid electrolyte in the positive electrode piece, the solid electrolyte have both a bonding function and a lithium conduction function, may replace a binder and a solid electrolytes in an existing electrode piece, can effectively improve and enhance the lithium ion transmission performance, and reduce the internal resistance of the battery. Meanwhile, the positive electrode piece including the solid electrolyte has a low porosity, below about 5%, which greatly reduces voids and holes in the positive electrode piece, increases the content of the positive-electrode active material in unit volume, improves the transmission of lithium ions and electrons, and effectively improves the energy density, cycling performance and rate performance of the battery.

Abstract: Disclosed are an electrolyte suitable for a lithium-ion battery of a silicon-carbon system and a lithium-ion battery. The electrolyte provided in the present disclosure includes an organic solvent, an additive, and a lithium salt, where the additive includes lithium trifluoromethyl triethyl borate, prop-1-ene-1,3-sultone, and fluoroethylene carbonate. The combined use of the additive may significantly prolong the cycle life of a silicon-carbon battery, and enables the silicon-carbon battery to have both high-temperature/low-temperature performance and safety performance, so that the silicon-carbon battery is enabled to be more suitable for large-scale commercial production.

Abstract: Disclosed are a negative electrode plate and a battery. A first negative active material layer is disposed at a bottom layer, and includes a first binder resistant to electrolyte swelling, has a better chemical corrosion resistance, and is not easy to age, so as to ensure long-term bonding, and reduce battery cell expansio. The negative electrode plate can maintain good mechanical strength and elongation at immersion of the electrolyte, so as to ensure that it is not separatedr. A second binder in a second negative active material layer away from the negative current collector uses a high swelling material, the high-swelling binder is in good affinity with the electrolyte, and the electrolyte infiltration speed is good, which facilitates lithium ion conduction. Furthermore, the high-swelling binder is bound to the separator well in a hot pressing process, so as to improve an interface bonding effect.

Abstract: A negative electrode piece and a secondary battery including the same. A type of polymer different from that in the prior art is selected as a component in the negative electrode piece, the polymer has high elasticity, high extensibility, can replace the polymer in the existing negative electrode piece, and can effectively improve and enhance the transmission performance of lithium ions and reduce the internal resistance of the lithium-ion battery. At the same time, it can effectively reduce side reactions caused by the expansion of the negative electrode piece, improve lithium conductive channels inside the negative electrode piece, and improve battery performance of the negative electrode piece during the battery cycling.

Abstract: Disclosed are a polymer, a solid-state electrolyte including the polymer, a gel electrolyte, and a battery. The polymer includes a repeating unit A. The repeating unit A has a structure represented by Formula 1. In Formula 1, R1 is selected from H or C1-6 alkyl; R2 is a linking group; R3 is an end-capping group; M is selected from a borate chain segment, an aluminate chain segment, or a phosphate chain segment; and * denotes a linking end. The solid-state electrolyte including the polymer in the present disclosure or the battery including the gel electrolyte has a lower internal resistance, better transmission performance of ions, better cycle performance, a broader electrochemical window, and higher electrochemical stability.

Abstract: Disclosed are a positive electrode plate and a lithium-ion battery including the positive electrode plate. The positive electrode plate includes a positive current collector, a safety coating layer, a composite fusion layer, and a positive active material layer; the safety coating layer comprises a first conductive agent, a first binder, a functional microsphere, and an auxiliary agent. The safety coating layer has conductive performance at normal temperature, and has the advantages of increasing a contact area between an active material and the current collector, improving the electrical conductivity, and effectively reducing polarization of the battery; when the use temperature of the positive electrode plate reaches 120° C. or above, the functional microsphere will be melted to form a plurality of continuous electron blocking layers, the coating layer blocks current, internal blocking is formed inside the battery, and the occurrence of further thermal runaway of the battery is prevented.

Abstract: A positive electrode sheet containing a high-safety heat-sensitive coating and a lithium-ion battery containing the positive electrode sheet are provided. The heat-sensitive coating includes a first conductive agent, a first binder, heat-sensitive polymer microspheres and an auxiliary agent, and has a conductive property at normal temperature and also has advantages of increasing a contact area between an active material and a current collector, improving the conductivity, and effectively reducing the polarization of battery and the like; when the use temperature of the positive electrode sheet reaches 120° C. and above, the heat-sensitive polymer microspheres will melt to form a plurality of continuous electron blocking layers, current blocking occurs in the coating, an internal blocking forms inside the battery, thereby preventing the occurrence of further thermal runaway of lithium-ion battery.

Abstract: This application relates to an interface functional layer and a preparation method thereof, and a lithium-ion battery, where the interface functional layer includes a cyclic ether compound, a lithium salt, an auxiliary agent and a ceramic powder in a mass ratio of 50-90:5-30:5-40:0-5. In this application, the interface functional layer is provided between a positive and/or negative electrode and a solid electrolyte, thereby inhibiting the uneven deposition of lithium-ions at interfacial gaps, reducing the interface impedance, and meanwhile improving the interfacial stability.

Abstract: Disclosed are a positive electrode plate and a lithium-ion secondary battery containing the positive electrode plate. In the present disclosure, a polymer electrolyte prepared from a polymer that is different from a polymer used in the conventional technology, and the solid electrolyte, having not only a binding function but also a lithium-conducting function, may replace a binder and a solid electrolyte in an existing electrode plate, so that transmission performance of lithium ions can be effectively improved, and an internal resistance of a solid-state battery can be reduced. In addition, a porosity of a positive electrode plate containing the solid electrolyte is low. This effectively improves energy density and cycling performance of the solid-state battery. The positive electrode plate containing the solid electrolyte may be applied to a battery system having high energy density, thereby broadening a disclosure range of the positive electrode plate.

Abstract: The disclosure provides a lithium-ion battery that satisfies the equation (2M+3)2(S+2)2/W?20, where M=exp(m1/d1)+(d1?2)(m1?0.26). Wherein, m1 is the tensile strength of the negative electrode current collector in the length direction, and d1 is the thickness of the negative electrode current collector. Additionally, S=exp(m2/d2)+(d2?2)(m2?0.16), wherein m2 is the puncture strength of the separator, and d2 is the thickness of the substrate within the separator. Furthermore, W=(((exp(?10q))/(??6)+exp(10q))(d3?13.5)(??3.5))/100. This disclosure effectively addresses the issue of pressure exerted on the battery casing due to volume swelling of the negative electrode material, thereby significantly enhancing the battery's cycle life and safety performance.

Abstract: The preparation method of the solid polymer electrolyte includes the following steps: S1, adding a vinyl boron fluorine monomer, a vinyl polyether monomer, a modified monomer, and a functional polymer into a solvent, adding an initiator for reaction, and after performing a purification treatment to obtain a polymer system B; S2, adding the polymer system B, a lithium salt, a filler, and an auxiliary agent into a solvent, and adding a crosslinking agent to obtain a mixed solution, and coating the mixed solution on a mold uniformly for reaction; S3, obtaining the solid polymer electrolyte. The obtained solid polymer electrolyte, a positive electrode plate, and a negative electrode plate are assembled into a solid-state battery core, and then a tab welding, a heat treatment, and an encapsulation treatment are performed to obtain a lithium ion battery.

Abstract: The present disclosure provides a jelly roll and a battery. The jelly roll comprises a first electrode plate with a first electrode tab, a separator, and a second electrode plate with a stepped groove opposite to the electrode tab. The stepped groove comprises a first groove and a second groove that are arranged away from the first electrode tab and are in communication in sequence. A projection of the second groove is located within that of the first groove. An active layer ending portion and a termination adhesive tape are provided on one side of a winding tail end of the first electrode plate, which side faces toward the second electrode plate. A head portion of the termination adhesive tape covers the active layer ending portion. Both the head portion of the termination adhesive tape and the active layer ending portion are located in the second groove.

Abstract: A battery includes a positive electrode plate, a negative electrode plate, and an electrolyte solution. The negative electrode plate includes a negative electrode current collector including a copper foil and a negative electrode active material layer including a negative electrode active material which including a silicon-based active material, the electrolyte solution includes lithium bis(trifluoromethanesulfonyl)imide; and the battery satisfies following relationship: B?10A?C/10+3?0; A is a grain size of copper foil, in a unit of m; B is a mess percentage of lithium bis(trifluoromethanesulfonyl)imide in the electrolyte solution, in a unit of wt %; C is a mass percentage of the silicon-based active material in the negative electrode active material, in a unit of wt %, and C?50. The battery may significantly alleviate silicon negative electrode expansion while enhance the kinetic performance and cycling stability of the battery under room-temperature.

Abstract: A electrolyte solution includes a first additive having a structure represented by formula (I) and a second additive having a structure represented by formula (II): where R1, R2, R3 each are independently selected from and R4, R5, and R6 each are independently selected from a C1-C10 alkyl group, a C2-C10 alkenyl group, or a C1-C10 alkoxy group; and X is selected from hydrogen, halogen, the C1-C10 alkyl group, the C2-C10 alkenyl group, a C2-C10 alkynyl group, or a C1-C4 cyano group, and n is 1, 2, 3, or 4.

Abstract: An electrolyte and a preparation method thereof and a lithium ion battery, where the electrolyte comprises the following components in percentages by mass: 10-20% of a lithium salt, 0.2-7% of an additive composition and a balance of a solvent; among them, the additive composition comprises a boron-containing lithium salt compound and a sulfur-based compound represented by Formula 1, in which R1 and R3 are each independently selected from hydrogen, halogen, or substituted or unsubstituted alkyl; R2 is selected from a substituted or unsubstituted alkylene, or is a direct bond; the boron-containing lithium salt compound is at least 0.1% by mass of the electrolyte. The electrolyte can significantly improve the performance of an SEI film, thereby facilitating increasing the cycle performance and storage performance of the lithium ion battery.