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Method for improving cycle life of lithium-ion battery by using lithium nitride

wallpapers News 2021-06-21
Method for improving cycle life of lithium-ion battery by using lithium nitride
A method for improving the cycle life of a lithium-ion battery by using lithium nitride can solve the technical problem of poor cycle performance of the existing lithium-ion battery. Including grinding lithium nitride powder material in a glove box protected by argon; mixing NMP and PVDF, vacuum stirring to make glue industry, glue liquid viscosity control 3000-6000mPa·s; adding ground lithium nitride powder, vacuum Stirring; Use a coating machine to uniformly coat the prepared lithium nitride slurry on the surface of the positive electrode sheet, dry and roll; then match the corresponding negative electrode sheet to make a battery according to the traditional process. The manufacturing process of the present invention is simple, the existing lithium-ion battery production equipment can meet the requirements of the device, and is suitable for industrial production applications; lithium nitride is distributed on the surface of the positive electrode plate, and the rate performance of th e battery is less affected; and the lithium nitride is uniformly distributed on the surface of the positive electrode plate, Is conducive to the formation of a dense and uniform SEI film; the cycle life of lithium-ion batteries that have been supplemented by lithium nitride with lithium can be improved.
Lithium nitride/ceramic-based composite material with high-activity lithium deintercalation performance and preparation method thereof
The invention belongs to the field of lithium-ion batteries and supercapacitors. Specifically, it relates to a type of lithium nitride/ceramic-based composite negative electrode material prepared by a mechanochemical method with a high specific capacity, reversibility of electrochemically deintercalation lithium, and stable cycle performance, and a preparation method thereof. The composite material uses lithium nitride as the active reinforcement and silicon-containing ceramic powder as the matrix. In the composite material, the chemical bond between the active reinforcement and the matrix is ​​​​the main interface bonding method and has Good structural stability, the molar ratio of reinforcement to the matrix is ​​​​between 1:1-9:1. The invention has better electrochemical cycle performance and rate performance; and a wider voltage window, and its ion conductivity and cycle performance are good, and it has potential application value in the aspect of novel supercapacitor electrode materia ls. The preparation method is simple and easy to control, all required raw materials do not contain heavy metal elements, and have the advantages of environmental protection and low price.

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Tag: nitride   lithium