2results about How to "Increase gram capacity" patented technology

The present application relates to iron manganese series polyanionic compound has one or two or more above structure shown in formula I, formula II, formula III: Na 4‑a Fe 2+ x M1 n1+ z1 M2 n2+ z2 Mn 2+ 3‑x‑z1‑z2 (PO4)2P2O7,0≤x<3 Formula INa 3‑a Fe 2+ x M1 n1+ z1 M2 n2+ z2 Mn 2+ 2‑x‑z1‑z2 (PO4)P2O7,0≤x<2 Formula IINa 2‑a Fe 2+ x M1 n1+ z1 M2 n2+ z2 Mn 2+ 1‑x‑z1‑z2 P2O7,0≤x<1 Formula III Through the cell electronic structure regulation mechanism improves the first circle charge and discharge process reversibility of material, the prepared phosphoric acid pyrophosphate composite, pyrophosphate composite polyanionic compound electrode material, the specific capacity is high and the rate performance is excellent.

This invention discloses an electrode conductive additive, an electrode sheet, and an electrochemical device, relating to the field of electrochemical energy storage. The electrode conductive additive comprises a core layer and a shell layer covering at least a portion of the surface of the core layer. The core layer is a low-modulus elastomer with a compressive modulus ≤ 25 MPa. The shell layer is a conductive polymer. The particle size H of the core layer and the thickness X of the shell layer satisfy the following relationship: 1.2 ≤ (1 + 2X / H). 3 ≤3.1, this conductive additive can be added to the active layer of the electrode as a conductive agent. The conductive additive of this application uses a low-modulus elastomer as the core layer, which can absorb the stress generated by rolling, avoid the breakage of active material particles and electrode deformation, and provide a continuous conductive path through the conductive polymer coated in the shell, reduce the electrode resistance, improve the electrochemical performance of the battery, maximize the compaction density, and maintain a high specific capacity of the electrode, thus achieving economic benefits.