Abstract: A ceramic microsphere, a diaphragm including the ceramic microsphere and a lithium ion battery including the diaphragm, where the present disclosure differs from a diaphragm of a conventional lithium ion battery mainly in that, two kinds of coating microspheres, the conductive microsphere and the ceramic microsphere, respectively, which have high safety performance by heat sensitively blocking lithium ions and heat sensitively conducting electrons, are prepared by using a polymer coating method, and the two kinds of coating microspheres with high safety are applied to the diaphragm of the lithium ion battery, so that the diaphragm of the lithium ion battery has two functions of heat sensitively blocking lithium ions and heat sensitively conducting electrons, which can effectively improve the safety performance of the lithium ion battery.

Abstract: A diaphragm and a high-voltage battery including the diaphragm. A modification layer is coated on a surface of an inorganic ceramic particle, the modification layer can adsorb transition metal ions precipitated from an electrode material, thereby preventing the transition metal ions from forming transition metal precipitates on a surface of a negative electrode and improving safety, rate performance and cycle performance of the battery. At the same time, since the modification layer is coated on the surface of the inorganic ceramic particle, thus it will not have a significant impact on an internal resistance of the battery, and thereby not reducing the rate, low temperature, and cycle performances of the battery.

Abstract: Provided are a polymer electrolyte and a lithium-ion battery including the polymer electrolyte. A preparation method of a polymer electrolyte includes: (1) dissolving a functional polymer with an organic solvent, and uniformly mixing to obtain a system A, where the functional polymer has a mass ratio of 0.2%-30% in the system A; (2) uniformly mixing the A system, a lithium salt, and a functional additive to obtain a mixed solution; (3) subjecting the mixed solution to in-situ polymerizing to obtain the polymer electrolyte. The polymer electrolyte has better affinity with anions of the lithium salt and relatively high electrical conductivity, and greatly improves the performance of the semi-solid state battery. The semi-solid state battery prepared is based on the existing lithium-ion battery processing technology, has good processing performance and electrochemical performance, and has certain application prospects.

Abstract: An electrolyte, a preparation method thereof and a lithium ion battery, where the electrolyte comprises a solvent, a lithium salt, and a first additive shown in Formula 1; in Formula 1, R1 and R3 are each independently selected from a substituted or unsubstituted C1-C20 alkyl group, (—C2H4—O—C2H4—)n or is a direct bond, and 1?n?5; R2 is selected from one of —NH—, —CH2—, —SiH2—, —BH— and —PH—.

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.

Abstract: The present application provides a silicon-based negative electrode material and a preparation method and use thereof. The silicon-based negative electrode material has a lithium borate coating layer on its surface, which may improve first charge-discharge efficiency of the material. There is a strong chemical bond interaction between the lithium borate coating layer and the borate ester having a specific structure, which may improve the rate capability of the battery. Furthermore, the borate ester has a structure of —(CH2CH2O)n—CO—CR0?CH2, and the negative plate prepared with the silicon-based negative electrode material will undergo a cross-linking reaction during a high-temperature baking of the plate, so that a cross-linking is formed among particles of the silicon-based negative electrode material, thereby effectively ensuring the structural integrity of the silicon-based negative electrode plate during recycling, and improving the cycle performance of the battery.

Abstract: The present application provides a non-woven fabric separation membrane and a preparation method and a use thereof. The non-woven fabric separation membrane of the present application includes a plurality of fibers, and the fibers are closely connected to each other through a modifier, which significantly improves the tensile strength and the puncture strength of the separation membrane. Meanwhile, molecules of the modifier are grafted on surfaces of the fibers, which improves wettability for an electrolyte solution to the separation membrane, thereby improving the ionic conductivity of the separation membrane and the rate performance of a battery. Ti metal or Zr metal in the modifier molecule can effectively attract an electrolyte anion in the electrolyte solution to improve the ion migration number of the electrolyte solution, reduce battery polarization, and improve the rate performance of the battery.

Abstract: An electrolytic solution includes an organic solvent, an electrolyte, and an additive. The additive includes a first compound represented by Formula 1, where R1 is selected from one of a single bond, substituted or unsubstituted alkoxy, C1-C6 alkylene, and C2-C6 alkenyl; R2 and R3 each are independently selected from one of substituted or unsubstituted alkoxy, C1-C6 alkylene, and C2-C6 alkenyl; and R4 is B or P. Since the first compound includes an N-containing group that may be combined with a protonic acid in the electrolytic solution, the electrolytic solution have good stability; moreover, the cycle performance of a lithium secondary battery is improved.

Abstract: The present disclosure provides a positive electrode sheet and a lithium ion battery including the same. The present disclosure is implemented by controlling a safe coating layer and a positive electrode active material layer coated on a surface of a positive electrode current collector, mixing NCM material and LCO material, and making high-voltage small particles of lithium cobaltate as one of fillers for the safe coating layer, where the doped high-voltage lithium cobaltate can be provided for supporting the NCM material, so, with the safe coating layer, the short-circuit failure between a negative electrode and an aluminum foil caused by burrs of the aluminum foil may be avoided, the mechanism and the safety performance may be increased, the problems of cycle capacitance attenuation and excessive increase of high-temperature internal resistance, caused by the breakage of the NCM material particles, may also be improved while guaranteeing the improvement of safety performance.

Abstract: The present disclosure provides a current collector and a preparation method thereof and an application therefor. The current collector provided by the present disclosure includes a functional film layer and metal layers provided on an upper surface and a lower surface of the functional film layer, where the functional film layer includes a fire retardant. Due to an addition of the fire retardant in the functional film layer, the current collector and the preparation method thereof provided by the present disclosure can not only effectively decrease an ignition point, but also release the fire retardant from the current collector to an electrolyte at high temperature, so as to achieve an effect of active fire extinguishing and significantly improve a safety performance of a battery; the functional film layer can also carry the metal layers on the upper and lower surfaces thereon.

Abstract: A cross-linked SBR microsphere binder and a preparation method, and a lithium-ion battery containing the binder, the cross-linked SBR microsphere binder has a porous cross-linked structure, the cross-linked SBR microsphere has a particle size of 10 nm-1 ?m, and a porosity of 0.01%-40%, and a pore diameter of the pore is greater than 0 and less than or equal to 200 nm. The lithium-ion battery containing the binder has advantages of better rate performance, low temperature performance, fast charge performance, and long cycle performance, compared with a lithium-ion battery containing a conventional SBR binder.

Abstract: The present application provides a composite material and a preparation method thereof, and a lithium ion battery, and belongs to the technical field of lithium batteries. A specific solution is as follows: the composite material is an oxide electrolyte coated nano-attapulgite composite material, where a coating layer of an oxide electrolyte has a thickness less than or equal to 20 ?m, a rod crystal of a nano-attapulgite has a length of 100 nm-50 ?m and a width of 10 nm-120 nm, and the nano-attapulgite is an organically modified natural nano-attapulgite and/or a lithium cation exchanged natural nano-attapulgite. The attapulgite composite material coated with the oxide electrolyte has a rod-shaped fast lithium ion transmission channel at a nanometer level, which can improve a transmission of lithium ions and has good lithium ion conductivity and excellent mechanical properties.

Abstract: The present disclosure provides a negative electrode sheet, a preparation method thereof and a lithium ion battery containing the same. The negative electrode sheet includes a negative electrode current collector, where the negative electrode current collector includes a single-sided coating area and a double-sided coating area; in the double-sided coating area, second coating layers are disposed on both side surfaces of the negative electrode current collector, respectively, wherein each of the second coating layers includes a first negative electrode active material layer and a second negative electrode active material layer, the second negative electrode active material layer is disposed on a surface of the negative electrode current collector, and the first negative electrode active material layer is disposed on a surface of the second negative electrode active material layer.