The present disclosure relates to a high-nickel positive electrode material and a preparation method therefor and a lithium ion battery, wherein a general chemical formula of the high-nickel positive electrode material is represented by formula (1): Li.sub.xNi.sub.1?(a+b+c+d+e+f)Co.sub.aM1.sub.bM2.sub.cM3.sub.dM4.sub.eM5.sub.fO.sub.2 (1), where 0.95?x?1.2, 0?a?0.15, 0?b?0.10, 0?c?0.05, 0?d?0.05, 0?e?0.05, 0?f?0.05, and 0<a+b+c+d+e+f?0.2. There is a relatively small amount of Ni.sup.3+ and a relatively large amount of Ni.sup.2+ in the surface of the high-nickel material in the present disclosure, which can avoid oxidation of the surface of the positive electrode material during lithium deintercalation, and facilitate maintaining structural stability of the positive electrode material, thereby avoiding loss of the positive electrode active material and the electrolytic solution, and further improving the capacity of the positive electrode material, so that the high-temperature cycle performance of the high-nickel positive electrode material is obviously improved.

The present invention relates to a method for producing boron nitride nanostructures, the method comprising subjecting boron nitride precursor material to lamp ablation within an adiabatic radiative shielding environment. The nanostructures produced may include nano-onion structures. The boron nitride precursor material subjected to lamp ablation may include amorphous boron nitride, hexagonal boron nitride, cubic boron nitride, wurtzite boron nitride or a combination of two or more thereof.

The invention provides a nano-silicon agglomerate composite negative electrode material of pine needle and branch-shaped three-dimensional network structure and a method for preparing the same. The nano-silicon agglomerate composite negative electrode material comprises nano-sized core particles, a nano-silicon agglomerate of pine needle and branch-shaped three-dimensional network structure growing around the nano-sized core particles, and a composite coating layer over the nano-silicon agglomerate of needles and branch-shaped three-dimensional network structure. With measurements, it is shown that the nano-silicon agglomerate composite negative electrode material, when being applied in lithium ion battery, has excellent battery charge-discharge cycle performances and rate capability, and it has an initial discharge capacity per gram of more than 2600 mAh/g, and an initial coulombic efficiency of no less than 85%.

A method for fabricating nanodiamond particles in a nanodiamond fabrication reactor, which method entails: a) forming a composite of a plurality of diamond monolayers interspersed with a plurality of non-monolayer dihydrobenzvalene (DHB), one over the other, by reacting kinetically energized carbyne radicals with a supported layer of DHB, thus sealing off any subtended, unreacted DHB from further reaction with the kinetically energized carbyne radicals. b) subjecting the diamond monolayers to an anvil having a nanomachined strike face, with sufficient force to fracture the diamond monolayers, to thereby produce nanodiamond having a shape in the X-Y plane matching that of the nanomachined strike face and a Z-axis dimension (thickness) which is that of a diamond monolayer.

Systems and methods are disclosed that utilize metal nanostructures that are synthesized in situ along the internal surfaces of a microfluidic device. The nanostructures are formed by initial deposition of metallic seeds followed by flowing growth and reducing agent solutions into the capillaries/microfluidic channels to grow the nanostars. The nanostructures may optionally be functionalized with a capture ligand. The capture ligand may be used to selectively bind to certain cells (e.g., circulating tumor cells). The cells may be removed by a beam of light (e.g., laser beam) that induces localized heating at the surface location(s) containing the nanostructures. The plasmonic nature of the nanostructures can be used to heat the nanostructure(s) locally for the selective removal of one or certain cells. The nanostructures may be used to acquire Raman spectra of molecules or other small objects that are bound thereto for identification and quantification.

Provided is a calcium carbonate that comprises crystals having a particular shape and structure and has a nano-order average particle size. Provided are a method for producing a calcium carbonate that comprises crystals having a particular shape and structure and has an average particle size in a particular range and a crystal growth method. The calcium carbonate has the calcite structure, has a BET specific surface area of 2 to 50 m.sup.2/g, has a number-based average particle size of 30 nm to 1.0 ?m as determined by electron microscopy, and partially comprises substantially ring-like particles.

The resin composition according to the present invention is a resin composition including a cyanate compound (A) and/or a maleimide compound (B), and an inorganic filler (C), wherein the inorganic filler (C) includes a boron nitride particle aggregate including primary hexagonal boron nitride particles, wherein (0001) planes of the primary hexagonal boron nitride particles are stacked on top of each other to thereby form the boron nitride particle aggregate.

Disclosed are an N-doped three dimensional carbon nanostructure, a method of preparing the N-doped three dimensional carbon nanostructure, and a supercapacitor electrode including the three dimensional carbon nanostructure.

In the present invention, a bis (fluorosulfonyl) imide metal salt is an alkali metal salt of bis (fluorosulfonyl) imide or an alkaline earth metal salt of bis (fluorosulfonyl) imide. The bis (fluorosulfonyl) imide metal salt has an average particle diameter of not less than 0.1 mm, or has an average moisture absorption rate of not more than 2.5 mass ppm/cm.sup.2.Math.min when sealed in a PE bag having a thickness of 80 m and left for 30 minutes at 23 C. and 65% humidity.

A preparation method of a tetragonal NaV.sub.2O.sub.5.H.sub.2O nanosheet-like powder includes steps of: (S1) simultaneously adding NaVO.sub.3 and Na.sub.2S.9H.sub.2O into deionized water, and then magnetically stirring, and obtaining a black turbid solution; (S2) sealing after putting the black turbid solution into an inner lining of a reaction kettle, fixing the sealed inner lining in an outer lining of the reaction kettle, placing the reaction kettle into a homogeneous reactor, and then performing a hydrothermal reaction; and (S3) after completing the hydrothermal reaction, naturally cooling the reaction kettle to the room temperature, and then alternately cleaning through water and alcohol, and then collecting a product, drying the product, and finally obtaining the tetragonal NaV.sub.2O.sub.5.H.sub.2O nanosheet-like powder with a thickness in a range of 30-60 nm and a single crystal structure grown along a (002) crystal orientation.