Positive active material for rechargeable lithium battery and method of preparing same
AssigneeSamsung Display Devices Co., Ltd.
InventorsHo-jin Kweon, Sung-soo Kim, Geun-bae Kim, Dong-gon Park
Life of this patent
Estimating the term…
Abstract
Disclosed is a positive active material for a rechargeable lithium battery. The positive active material includes a core including at least one compound represented by Formula 1 and an active metal oxide shell formed on the core. Formula 1 LiA1−x−yBxCyO2 where 0≦x≦0.3, 0≦y≦0.01, and A is an element selected from the group consisting of Co and Mn; B is an element selected from the group consisting of Ni, Co, Mn, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Cu and Al; and C is an element selected from the group consisting of Ni, Co, Mn, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Cu and Al.
Claims18
A positive active material for a rechargeable lithium battery comprising:
- a core comprising at least one compound represented by Formula 1;
- and
- an active metal oxide shell formed on the core, the metal oxide being capable of stabilizing a structure of the active material wherein the metal of the metal oxide shell is a metal selected from the group consisting of at least one of Mg, Al, Co, K, Na, Ca, Mn, Ni, B, Sr, Ba, Ti, V, Cr, Fe, and Cu;
- Formula 1
- LiAl−x−yBxCyO2,
- where 0≦x≦0.3, 0 ≦y≦0.01;
- A is an element selected from the group consisting of Co and Mn;
- B is an element selected from the group consisting of Ni, Co, Mn, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Cu and Al;
- and
- C is an element selected from the group consisting of Ni, Co, Mn, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Cu and Al.
A rechargeable lithium battery comprising a positive active material, the positive active material comprising a core comprising at least one compound represented by Formula 1 and an active metal oxide shell formed on the core, the active metal oxide being capable of stabilizing a structure of the active material, wherein the metal of the metal oxide shell is a metal selected from the group consisting of at least one of Mg, Al, Co, K, Na, Ca, Mn, Ni, B, Sr, Ba, Ti, V, Cr, Fe, and Cu;
- Formula 1
- LiA1−x−yBxCyO2,
- where 0≦x≦0.3, 0≦y≦0.01;
- A is an element selected from the group consisting of Co and Mn;
- B is an element selected from the group consisting of Ni, Co, Mn, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Cu and Al;
- and
- C is an element selected from the group consisting of Ni, Co, Mn, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Cu and Al.
A positive active material for a rechargeable lithium battery comprising:
- a core comprising LiCoO2;
- and
- an active metal oxide shell formed on the core, wherein the metal of the metal oxide shell is a metal selected from the group consisting of at least one of Mg, Al, Co, K, Na, Ca, Mn, Ni, B, Sr, Ba, Ti, V, Cr, Fe, and Cu.
A positive active material for a rechargeable lithium battery prepared by producing a crystalline powder or a semi-crystalline powder of Formula 1;
- coating the crystalline powder or the semi-crystalline powder with a metal alkoxide suspension;
- and
- heat-treating the coated powder,
- the positive active material comprising a core and an active metal oxide shell formed on the core, the metal oxide being capable of stabilizing the structure of the active material, wherein the metal of the metal oxide shell is a metal selected from the group consisting of at least one of Mg, Al, Co, K, Na, Ca, Mn, Ni, B, Sr, Ba, Ti, V, Cr, Fe, and Cu;
- Formula 1
- LiA1−x−yBxCyO2,
- where 0≦x≦0.3, 0≦y≦0.01;
- A is an element selected from the group consisting of Co and Mn;
- B is an element selected from the group consisting of Ni, Co, Mn, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Cu and Al;
- and
- C is an element selected from the group consisting of Ni, Co, Mn, B, Mg, Ca, Sr, Ba, Ti, V, Cr, Fe, Cu and Al.
A positive active material for a rechargeable lithium battery comprising:
- a core comprising LiCoO2;
- and
- an active Al2O3 shell formed on the core wherein the metal of the active Al2O3 shell is metal selected from the group consisting of at least one of Mg, Al, Co, K, Na, Ca, Mn, Ni, B, Sr, Ba, Ti, V, Cr, Fe, and Cu.
Dependencies are inferred from the claim text.