Shanghai Research Institute of Petrochemical Technology, Sinopec

China Petroleum Chemical Corporation

China Petroleum & Chemical Corporation

Huanxin Gao

Siyu Zhang

Sai Sun

Hua Fang

Yilun Wei

Ruifang Gu

Bin Zhou

Shufang Ji

Hui Yao

Wenqian Dong

Hongyuan Zong

Ye Zhu

Tongbao Zhang

Biwei Wang

A silicon-based negative electrode material, a preparation method therefor, and an application thereof in a lithium ion battery are provided. A lithium ion battery contains the silicon-based negative electrode material. The negative electrode material contains a silicon-containing material and a phosphorus-containing coating layer at the surface of the silicon-containing material. The phosphorus-containing coating layer contains a polymer that has polycyclic aromatic hydrocarbon structural segments. The negative electrode material exhibits improved initial coulombic efficiency, reversible charging specific capacity, cycle charging capacity retention and conductivity. When used in the lithium ion battery, the negative electrode material may improve the energy density of the battery.

Negative electrode material, preparation method therefor, and application thereof, and lithium ion battery comprising same

A lithium battery positive active material precursor, a preparation method therefor and the use thereof are provided. The precursor has a chemical formula of NiCoM(OH), wherein M is at least one metal selected from the group consisting of Fe, Cr, Cu, Ti, Mg, W, Mo, Nb, Zn, Sn, Zr, Ga, Mn and Al, 0.3≤x≤1, 0<y≤0.5, 0<z≤0.3; and the precursor comprises aggregates of platy monocrystals and polyhedral monocrystal particles. In the XRD pattern of the precursor, (001), I(100) and I(101) satisfy the following relationship: I(001)/I(100) is not less than about 1.5, and I(001)/I(101) is not less than about 1.2.

Lithium battery positive electrode material precursor, preparation method therefor and application thereof

A negative electrode material of the lithium-ion battery, a preparation method therefor and an application thereof, and a lithium-ion battery include the same are provided. The negative electrode material has a core-shell structure. The core has a silicon-containing material while the shell has an organic lithium salt and a porous carbon film, and at least part of lithium ion is intercalated in the porous carbon film. The negative electrode material is prepared by (1) mixing a silicon source and a carbon source, and then calcining the mixture; (2) mixing the calcined product obtained in the step (1) with the organic lithium salt; and (3) subjecting the materials obtained in the step (2) of mixing to vacuum freeze-drying.

Negative electrode material, preparation method therefor and application thereof, and lithium-ion battery

A graphene powder, its preparation method and application are provided. The graphene powder is a stack of graphene sheets. The graphene powder involves in its Raman spectrum a D peak and a G peak with peak heights of Iand Irespectively, where I/Iis 0.10 or less. The graphene powder can be applied in conductive composite materials, anti-corrosion coatings, heat dissipation composite materials. In particular, when used in lithium-ion batteries, it can significantly reduce electrode internal resistance and improve battery stability at any current rates.

Graphene powder, and preparation method therefor and application thereof

A conductive composite material of graphene contains graphene nano-sheets and conjugated copolymers. The conjugated copolymers has alkynyl groups and are in a linear structure and grafted to the graphene nano-sheets. The preparation of conductive composite material includes the steps of: pretreating the graphene nano-sheets with 4-bromobenzenediazonium tetrafluoroborate, and forming the conjugated copolymers in the presence of the pretreated graphene nano-sheets. The conductive composite material of graphene can be uniformly dispersed in an electrode slurry, reduce the internal resistance of an electrode, and improve the electrical conductivity of an electrode. At the same time, the flexible structure associated with the graphene nano-sheets can buffer the volume expansion of the silicon-containing negative materials during charge-discharge cycling. Such a composite material can be in a lithium-ion battery.

Conductive composite material of graphene, preparation method therefor, use thereof and lithium-ion battery

A method for producing isopropyl benzene includes the following steps. Step A: feeding a first stream containing benzene and a first stream containing propylene into a first reaction zone to contact a first catalyst for alkylation, and obtaining a first stream containing isopropyl benzene from the first reaction zone, dividing the first stream containing isopropyl benzene into a stream Ia and a stream IIa, the stream Ia circulating back into the first reaction zone and the stream IIa entering into a second reaction zone, having the stream entering the second reaction zone to contact a second catalyst for alkylation, and obtaining a second stream containing isopropyl benzene from the second reaction zone, and purifying at least a partial stream IIIa of the second stream containing isopropyl benzene, and obtaining a product isopropyl benzene.

Method for producing isopropyl benzene from benzene and propylene

A process of producing isopropyl benzene which solves the problem of high amount of n-propyl benzene according to the prior art. The process separates the polyisopropyl benzene through a suitable rectification into two streams of relatively lighter and heavier components, wherein the content of diisopropylbenzene in the stream of relatively lighter components is controlled to be at least greater than 95 wt %, and the content of tri-isopropyl benzene in the stream of relatively heavier components is controlled to be at least greater than 0.5 wt %. Such a technical solution subjecting the two streams respectively to the transalkylation solves the problem raised from the prior art, and is useful for the industrial production of isopropyl benzene.

Process for producing cumene

The present invention relates to an organosilicon porous zeolite, preparation of the same, and use of the same. The organosilicon porous zeolite of the invention has the following composition on molar basis: (1/n)AlO:SiO:mR:xM, wherein n=5 to 1000, m=0.001 to 1, x=0.005 to 2, R is at least one selected from the group consisting of alkyl, alkenyl and phenyl and connected to a silicon atom in the framework of the zeolite, and M is an organic amine templating agent, wherein a solid SiNMR spectrum of the zeolite has at least one Sinuclear magnetic resonance peak in the range of from &#x2212;80 to +50 ppm, and wherein a X-ray diffraction pattern of the zeolite exhibits diffraction peaks corresponding to d-spacing of 12.4&#xb1;0.2, 11.0&#xb1;0.3, 9.3&#xb1;0.3, 6.8&#xb1;0.2, 6.1&#xb1;0.2, 5.5&#xb1;0.2, 4.4&#xb1;0.2, 4.0&#xb1;0.2 and 3.4&#xb1;0.1 &#x212b;. The porous zeolite can be used as an adsorbent or as a component of a catalyst for the conversion of an organic compound.

Growing community of inventors

Shanghai, China

Huanxin Gao