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: A negative electrode plate includes a negative electrode current collector, a first coating on a surface of the negative electrode current collector, and a second coating on the surface of the first coating. The first coating includes first silicon particles and a coating layer on the surface of the first silicon particles; the coating layer includes a polymer material, carbon nanotubes, and a first conductive agent; and the ratio R of a centre-to-centre distance of the adjacent particles to a median particle size Dv50 of the first silicon particles is (0.01-100):1.

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: Disclosed are a negative electrode plate, an electrochemical energy storage apparatus and an electronic apparatus comprising the negative electrode plate. A negative electrode active material of the negative electrode plate includes a first amorphous carbon material. An interlayer spacing d002 of the first amorphous carbon material is greater than 0.34 nm, and an average pore diameter of pores of the first amorphous carbon material ranges from 2 nm to 20 nm. The negative electrode plate can help improve energy density of a lithium-ion battery and suppress expansion of an electrochemical energy storage apparatus during cycling.

Abstract: Disclosed are a separator and a battery including the separator. The separator includes a separator base layer and a ceramic coating disposed on a first surface of the separator base layer. The ceramic coating includes ceramic particles. One or more of a surface and an interior of the ceramic coating have micropores. A porosity of the ceramic coating ranges from 40% to 80%. In the micropores, a volume of pores with apertures greater than 0.1 microns occupies 45%-90% of a total pore volume, and a volume of pores with apertures greater than 1.0 micron occupies 40%-80% of the total pore volume. In the present disclosure, a porosity of the separator is improved, and a rate, a residual liquid volume, low-temperature discharging performance, and cycling performance of the battery are improved. In addition, separator nail penetration strength, self-discharging performance, and safety performance are not affected.

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 and a negative electrode active material layer on a surface of the negative electrode current collector, the negative electrode current collector includes a copper foil, a grain size of the copper foil A is less than or equal to 0.75 ?m; and the electrolyte solution includes a nitrile compound.

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 lithium-ion battery includes a positive electrode plate, a negative electrode plate, a separator and an electrolyte; the electrolyte includes an organic solvent, an additive and a lithium salt. The additive includes fluoroethylene carbonate, accounts for 9 wt % to 20 wt %; the additive further includes at least one of succinonitrile, adiponitrile, glycerol trinitrile, 1,3,6-hexanetricarbonitrile, and 1,2-bis(cyanoethoxy) ethane, and a content thereof accounts for 1 wt % to 5 wt % of a total mass of the electrolyte; the negative electrode plate includes a negative electrode active material, and the negative electrode active material includes a silicon-carbon negative electrode material including nano-silicon and/or SiOx(0.8?x?1.3) and graphite. One or more of the nano-silicon and SiOx account for 1 wt % to 55 wt % of a total mass of the silicon-carbon negative electrode material.

Abstract: The present disclosure pertains to the field of batteries, and particularly relates to a battery. The battery comprises a positive electrode plate. The positive electrode plate comprises a positive current collector, a first active layer, and a second active layer. The first active layer is arranged on at least one side surface of the positive current collector, and the second active layer is arranged on an outer surface of the first active layer. After the battery is charged to 4.48V at 1.5C and discharged at 0.7C at 45° C. for 500 cycles, a ratio Ia=I(003)/I(104) of a peak intensity (003) to a peak intensity (104) in an X-ray diffraction spectrum of the first active layer and a ratio of Ib=I(003)/I(104) of a peak intensity (003) to a peak intensity (104) in an X-ray diffraction spectrum of the second active layer satisfy 0.5<Ib/Ia?1.

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.