Lithium manganese composite oxide for a lithium secondary battery cathode active material
AssigneesUniversity of Central Florida Research Foundation, Inc., Honda Motor Co., Ltd.
InventorsAkihiro Kushima, Takashi Hakari, Yoshiyuki Morita, Yoshiya Fujiwara, Akihisa Tanaka, Kazumasa Sakatsume
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Abstract
A nickel-free and cobalt-free cathode for a lithium (Li) battery is provided. The lithium manganese composite oxide material of the cathode has a sloping discharge voltage profile between 3V to 4 V. The material comprises multiple crystal structures with R3-m, C2/m, and Pmnm space groups, and is characterized to maintain a high capacity when these phases are in a specific ratio.
Claims20
A lithium manganese composite oxide (LiMnO2) for a lithium secondary battery cathode active material, the lithium manganese composite oxide comprising:
- a LiMnO2-based crystal in Pmnm space group;
- a LiMnO2-based crystal in C2/m space group;
- a LiAlO2 crystal in R-3m space group;
- and
- a Li2MnO3 crystal in C2/m space group, wherein the LiMnO2-based crystal in Pmnm space group, the LiMnO2-based crystal in C2/m space group, the LiAlO2 crystal in R-3m space group and the Li2MnO3 crystal in C2/m space group are crystallographically discrete.
A lithium manganese composite oxide cathode electrode for a lithium secondary battery, the cathode electrode comprising:
- a cathode current collector layer;
- a cathode layer positioned on the cathode current collector layer, the cathode layer comprising a lithium manganese composite oxide material, wherein the lithium manganese composite oxide material comprises;
- a LiMnO2-based crystal in Pmnm space group;
- a LiMnO2-based crystal in C2/m space group;
- a LiAlO2 crystal in R-3m space group;
- and
- a LizMnO3 crystal in C2/m space group, wherein the LiMnO2-based crystal in Pmnm space group, the LiMnO2-based crystal in C2/m space group, the LiAlO2 crystal in R-3m space group and the Li2MnO3 crystal in C2/m space group are crystallographically discrete.
A lithium secondary battery comprising:
- a cathode electrode comprising a cathode current collector and a cathode layer positioned on the cathode current collector layer, the cathode layer comprising a lithium manganese composite oxide material, wherein the lithium manganese composite oxide material comprises;
- a LiMnO2-based crystal in Pmnm space group;
- a LiMnO2-based crystal in C2/m space group;
- a LiAlO2 crystal in R-3m space group;
- a LizMnO3 crystal in C2/m space group, wherein the LiMnO2-based crystal in Pmnm space group, the LiMnO2-based crystal in C2/m space group, the LiAlO2 crystal in R-3m space group and the Li2MnO3 crystal in C2/m space group are crystallographically discrete;
- an anode electrode;
- and
- an electrolyte positioned between the anode electrode and the cathode electrode.
Dependencies are inferred from the claim text.