2results about How to "Reduce charge density" patented technology

The application provides a positive electrode active material, a preparation method thereof, a positive electrode sheet and a secondary battery. The positive electrode active material comprises a compound with a chemical formula of formula 1: [Na x □ y ]Ni a Fe b Mn c A m Q n O β formula 1, wherein 0.6<=x<1.0, 0.06<=y<=0.4, 0<=a<=0.5, 0<=b<=0.5, 0.35<=c<=0.7, 0<=m<=0.1, 0<=n<=0.1, 1.96<=beta<=2.02, and a<c; □ is a Na vacancy, the Na vacancy comprises an intrinsic Na vacancy and a Na vacancy introduced by the A; the A comprises at least one of metal ions with full or empty d orbitals, and the Q comprises at least one of metal cations with +1 valence or +2 valence. In the application, the A enters the TM layer to replace part of the Mn 4+ , so that the TM n+ is in an electron-deficient state, and spontaneous oxidation reaction is inhibited.

The application discloses a method for preparing 2,5-bis(aminomethyl)furan. The method comprises the following steps: loading 5-hydroxymethylfurfural and ammonia into a reaction kettle loaded with a catalyst, introducing hydrogen into the reaction kettle, and reacting at 150 DEG C to 190 DEG C for 10 to 14 hours to generate 2,5-bis(aminomethyl)furan through a reductive amination reaction; the catalyst is a core-shell structure, and is composed of a silica shell and a metal core; the metal core is metal M, which is Ni or Co; and the molar ratio of the silica to the metal M is 0.1 to 0.3. The application has no by-products, no pollution, less waste, and the conversion rate of 5-hydroxymethylfurfural can reach 99%, the selectivity of 2,5-bis(aminomethyl)furan is 99%, and the green and sustainable production of 2,5-bis(aminomethyl)furan is realized.