The present invention relates to an electrolyte for a lithium secondary battery, containing, as an electrolyte additive, at least one compound selected from the group consisting of compounds represented by chemical formulas 1 to 4 below, and can provide a lithium secondary battery which has improved anodic film forming characteristics and battery resistance characteristics at high voltages.

The present invention relates to an electrolyte for a lithium secondary battery, containing, as an electrolyte additive, at least one compound selected from the group consisting of compounds represented by chemical formulas 1 to 4 below, and can provide a lithium secondary battery which has improved anodic film forming characteristics and battery resistance characteristics at high voltages.

The invention discloses a method for preparation of alkylated, fluoro alkylated, chloro alkylated and fluorochloro alkylated compounds by a heterogeneous Co-catalysed alkylation or fluoro, chloro and fluorochloro alkylation with alkyl halides, fluoro alkyl halides, chloro alkyl halides or fluorochloro alkyl halides respectively.

The invention discloses a method for preparation of alkylated, fluoro alkylated, chloro alkylated and fluorochloro alkylated compounds by a heterogeneous Co-catalysed alkylation or fluoro, chloro and fluorochloro alkylation with alkyl halides, fluoro alkyl halides, chloro alkyl halides or fluorochloro alkyl halides respectively.

Provided are a process and a device for preparing environmentally-friendly insulating gas perfluoroalkylnitrile. The device comprises a first tank reactor, a second tank reactor, and a fixed bed reactor. A condensing and collecting device is provided at the top of the first tank reactor, a collecting and guiding channel at the bottom of the condensing and collecting device is connected to an inlet of a storage tank, and an outlet of the storage tank is connected to an inlet of the second tank reactor. The second tank reactor is connected to a perfluoroolefin tank. An outlet of the second tank reactor is connected to a storage gasification tank. The storage gasification tank is connected to a carrier gas tank, and an outlet of the storage gasification tank is connected to an inlet of the fixed bed reactor. The present invention starts from cyanuric chloride and perfluoropropylene, and uses two tank reactors and a fixed bed reactor to realize production with high atom economy. The preparation method has simple reaction conditions, high atom economy, low cost, and is continuous and enables scale production.

Provided are a process and a device for preparing environmentally-friendly insulating gas perfluoroalkylnitrile. The device comprises a first tank reactor, a second tank reactor, and a fixed bed reactor. A condensing and collecting device is provided at the top of the first tank reactor, a collecting and guiding channel at the bottom of the condensing and collecting device is connected to an inlet of a storage tank, and an outlet of the storage tank is connected to an inlet of the second tank reactor. The second tank reactor is connected to a perfluoroolefin tank. An outlet of the second tank reactor is connected to a storage gasification tank. The storage gasification tank is connected to a carrier gas tank, and an outlet of the storage gasification tank is connected to an inlet of the fixed bed reactor. The present invention starts from cyanuric chloride and perfluoropropylene, and uses two tank reactors and a fixed bed reactor to realize production with high atom economy. The preparation method has simple reaction conditions, high atom economy, low cost, and is continuous and enables scale production.

The present invention relates to a process for the preparation of fluoroalkylnitriles and the corresponding fluoroalkyltetrazoles starting from fluorinated carboxamides.

The present invention relates to a process for the preparation of fluoroalkylnitriles and the corresponding fluoroalkyltetrazoles starting from fluorinated carboxamides.

The present invention relates to a method for preparing fluoroalkylnitriles and the corresponding fluoroalkyltetrazoles by reacting fluorinated carboxamides with phosphorus trichloride (PCl.sub.3) or phosphorus oxychloride (POCl.sub.3) in the presence of a base.

The present invention relates to a method for preparing fluoroalkylnitriles and the corresponding fluoroalkyltetrazoles by reacting fluorinated carboxamides with phosphorus trichloride (PCl.sub.3) or phosphorus oxychloride (POCl.sub.3) in the presence of a base.