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US 12,749,680 B2Granted
Cathode active material, cathode and lithium secondary battery comprising same, and preparation method therefor
AssigneeSamsung Electronics Co., Ltd.
InventorsSangbok Ma, Joonhee Kim, Sungjin Lim, Valentina Lacivita, Yongwoo Shin, Taeyoung Kim
Life of this patent
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Abstract
A cathode active material represented by Formula 1 below: A2+xMP2O7Zy Formula 1 wherein in Formula 1, A is at least one element selected from Group 1 of the Periodic Table, M is at least one metal element selected from Groups 2 to 4, or 6 to 16 of the Periodic Table, and is a cation having a valence of at least two, Z is at least one element selected from Group 17 of the Periodic Table, 0<x≤4, and 0<y≤4.
Claims21
A cathode active material represented by Formula 2:
- Li2+aMP2O7Zb Formula 2
- wherein in Formula 2,
- M is at least one metal element selected from Groups 2 to 4, or 6 to 16 of the Periodic Table, and is a cation having a valence of at least two,
- Z is at least one element selected from Group 17 of the Periodic Table, and
- 0<a≤2, and 0<b≤2.
2 more elements
A method of preparing a cathode active material, comprising:
- preparing a first composition by mixing an element lithium precursor, an element Z precursor, an element M precursor, and a phosphorus precursor in a stoichiometric ratio to obtain a composition of Formula 2;
- and
- heat-treating the first composition in an oxidizing or an inert atmosphere at 400° C. to 1,000° C. for 3 to 20 hours,
- Li2+aMP2O7Zb Formula 2
- wherein in Formula 2,
- M is at least one metal element selected from Groups 2 to 4, or 6 to 16 of the Periodic Table, and is a cation having a valence of at least two,
- Z is at least one element selected from Group 18 of the Periodic Table, and
- 0<a≤2, and 0<b≤2.
5 more elements
Dependencies are inferred from the claim text.