Coated positive electrode materials for lithium ion batteries
First Claim
1. A lithium ion battery positive electrode material comprising an active composition coated with an inorganic coating composition,wherein the coating composition comprises a metal/metalloid fluoride and has an average thickness from about 0.5 nanometers (nm) to about 12 nm,wherein the active composition can be approximately represented by a formula Li1+xNiα
- Mnβ
Coγ
Aδ
O2, where x ranges from about 0.05 to about 0.25, α
ranges from about 0.1 to about 0.4, β
ranges from about 0.4 to about 0.65, γ
ranges from about 0 to about 0.3, and δ
ranges from about 0 to about 0.1, and where A is Mg, Zn, Al, Ga, B, Zr, Ti, Ca, Ce, Y, Nb, Cr, Fe, V, Li or combinations,wherein the material exhibits an average voltage that is no more than about 2 percent less than the average voltage of the same active composition without the coating, when cycled from 2V to 4.6V against lithium at a rate of C/10, andwherein the material comprises substantially spherically shaped particles with relatively homogenous size.
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Abstract
High specific capacity lithium rich lithium metal oxide materials are coated with inorganic compositions, such as metal fluorides, to improve the performance of the materials as a positive electrode active material. The resulting coated material can exhibit an increased specific capacity, and the material can also exhibit improved cycling. The materials can be formed while maintaining a desired relatively high average voltage such that the materials are suitable for the formation of commercial batteries. Suitable processes are described for the synthesis of the desired coated compositions that can be adapted for commercial production.
132 Citations
17 Claims
-
1. A lithium ion battery positive electrode material comprising an active composition coated with an inorganic coating composition,
wherein the coating composition comprises a metal/metalloid fluoride and has an average thickness from about 0.5 nanometers (nm) to about 12 nm, wherein the active composition can be approximately represented by a formula Li1+xNiα - Mnβ
Coγ
Aδ
O2, where x ranges from about 0.05 to about 0.25, α
ranges from about 0.1 to about 0.4, β
ranges from about 0.4 to about 0.65, γ
ranges from about 0 to about 0.3, and δ
ranges from about 0 to about 0.1, and where A is Mg, Zn, Al, Ga, B, Zr, Ti, Ca, Ce, Y, Nb, Cr, Fe, V, Li or combinations,wherein the material exhibits an average voltage that is no more than about 2 percent less than the average voltage of the same active composition without the coating, when cycled from 2V to 4.6V against lithium at a rate of C/10, and wherein the material comprises substantially spherically shaped particles with relatively homogenous size. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- Mnβ
Specification