• 专利标题:   Preparing hard carbon cathode material comprises passivating hard carbon precursor, where hard carbon precursor comprises modified hard carbon precursor comprising pre-lithiated hard carbon and/or pre-sodium hard carbon precursors, and passivation treatment comprises reacting sodium and/or lithium.
  • 专利号:   CN115893369-A
  • 发明人:   TAN G, CHEN H, ZHANG Z, YU Y, PENG T, HU L
  • 专利权人:   GANZHOU LITAN NEW ENERGY TECHNOLOGY CO
  • 国际专利分类:   C01B032/05, H01M010/052, H01M010/054, H01M004/36, H01M004/587
  • 专利详细信息:   CN115893369-A 04 Apr 2023 C01B-032/05 202336 Chinese
  • 申请详细信息:   CN115893369-A CN11487336 24 Nov 2022
  • 优先权号:   CN11487336

▎ 摘  要

NOVELTY - Preparing hard carbon cathode material comprises passivating hard carbon precursor to obtain the material, where the hard carbon precursor comprises a modified hard carbon precursor, the modified hard carbon precursor comprises pre-lithiated hard carbon precursor and/or pre-sodium hard carbon precursor, and the passivating treatment comprises reacting sodium and/or lithium in hard carbon precursor with passivating substance under the protective atmosphere to form a passivating layer, and reducing the activity of sodium and/or lithium in the hard carbon precursor. USE - The method is useful for preparing hard carbon cathode material. ADVANTAGE - The method: improves stability and safety of the pre-lithium or pre-sodium precursor in the air, and processing performance of pre-lithium or pre-sodium hard carbon cathode material when used as a secondary battery cathode material, slurry stability of cathode sheet during preparation process, and first-time efficiency of material; and is excellent for hard carbon cathode material and excellent cycle performance in the battery system. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a hard carbon cathode material prepared by the above-mentioned method; a mixed cathode material; and a secondary battery.