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LITHIUM-RICH MANGANESE-BASED POSITIVE ELECTRODE MATERIAL FOR USE IN LITHIUM-ION BATTERY, PREPARATION METHOD FOR THE MATERIAL, POSITIVE ELECTRODE TAB, LITHIUM-ION BATTERY, AND ELECTRIC VEHICLE

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اقرأ أكثر حفظ في قائمتي
  • Publication Date:
    March 9, 2023
  • معلومة اضافية
    • Document Number:
      20230076419
    • Appl. No:
      17/793259
    • Application Filed:
      October 29, 2020
    • نبذة مختصرة :
      Provided in the present disclosure are a lithium-rich manganese-based positive electrode material for use in a lithium-ion battery, a preparation method for the material, a positive electrode tab, the lithium-ion battery, and an electric vehicle. The lithium-rich manganese-based positive electrode material provides increased structural stability in a charging-discharging cycle, is not prone to experiencing an expansion or contraction that causes grain boundary stress imbalance, is not prone to undergoing a side reaction with an electrolytic solution, and is easy to industrialize; moreover, the lithium-ion battery made with the material provides great cycle performance, great rate performance, and great commercial prospect.
    • Assignees:
      SVolt Energy Technology Company Limited (Changzhou, Jiangsu, CN)
    • Claim:
      1. A lithium-rich manganese-based positive electrode material used in a lithium-ion battery, comprising a crystal formed by xLi2+αMn(1-μ-λ)TiμMλO3-νM′ν′(1-x)Li1+α′NiaCobMncMλ′O2-ν′M′ν′, wherein 0.4
    • Claim:
      2. The lithium-rich manganese-based positive electrode material according to claim 1, wherein M comprises at least one of Al3+, Mg2+, Ti4+, Zr4+, Zn2+, Ca2+, B3+, Cr3+, Cr6+, Ce3+ or Ce4+.
    • Claim:
      3. The lithium-rich manganese-based positive electrode material according to claim 1, wherein M′ comprises at least one of F−, Cl−, Br−, C4−, N3−, S2−, P3− or Se2−.
    • Claim:
      4. The lithium-rich manganese-based positive electrode material according to claim 1, wherein the median diameter D50 of the lithium-rich manganese-based positive electrode material is 3 μm to 14 μm.
    • Claim:
      5. The lithium-rich manganese-based positive electrode material according to claim 1, wherein the lithium-rich manganese-based positive electrode material is at least one of 0.5Li2Mn0.97Ti0.01B0.02O2.95F0.05.0.5LiNi0.4Co0.4Mn0.22B0.02O1.95F0.05 or 0.5Li2Mn0.98B0.02O2.95F0.05.0.5LiNi0.4Co0.4Mn0.22B0.02O1.95F0.05.
    • Claim:
      6. A method for preparing the lithium-rich manganese-based positive electrode material according to claim 1, comprising the following steps: (1) performing a first calcination treatment on a precursor for preparing a lithium-rich manganese-based positive electrode material to obtain a first prefab; (2) mixing the first prefab in step (1) with an additive comprising M and M′ to obtain a first mixture; (3) performing a second calcination treatment on the first mixture in step (2) to obtain a second prefab; (4) mixing the second prefab in step (3) with a lithium source to obtain a second mixture; and (5) performing a third calcination treatment on the second mixture in step (4) to obtain the lithium-rich manganese-based positive electrode material.
    • Claim:
      7. The preparation method according to claim 6, wherein the precursor comprises at least one of Ni0.2Co0.2Mn0.595Ti0.005CO3 or Ni0.2Co0.2Mn0.595Ti0.005CO2.95F0.05.
    • Claim:
      8. The preparation method according to claim 6, wherein the first calcination treatment is performed at a temperature of 300° C. to 800° C.
    • Claim:
      9. The preparation method according to claim 6, wherein the first calcination treatment is performed for 4 hours to 12 hours.
    • Claim:
      10. The preparation method according to claim 6, wherein the second calcination treatment is performed at a temperature of 330° C. to 820° C.
    • Claim:
      11. The preparation method according to claim 6, wherein the second calcination treatment is performed for 6 hours to 12 hours.
    • Claim:
      12. The preparation method according to claim 6, wherein the third calcination treatment is performed at a temperature of 700° C. to 950° C.
    • Claim:
      13. The preparation method according to claim 6, wherein the third calcination treatment is performed for 10 hours to 24 hours.
    • Claim:
      14. The preparation method according to claim 6, wherein at least one of the first calcination treatment, the second calcination treatment or the third calcination treatment is performed in an O2 and/or N2 atmosphere.
    • Claim:
      15. The preparation method according to claim 6, wherein the lithium source comprises at least one of LiOH.H2O or Li2CO3 and at least one of LiF and NH4F.
    • Claim:
      16. A positive electrode plate, comprising the lithium-rich manganese-based positive electrode material according to claim 1.
    • Claim:
      17. A lithium-ion battery, comprising the positive electrode plate according to claim 16.
    • Claim:
      18. An electric vehicle, comprising the lithium-ion battery according to claim 17.
    • Current International Class:
      01; 01; 01; 01
    • الرقم المعرف:
      edspap.20230076419