COATED POSITIVE ELECTRODE MATERIALS FOR LITHIUM ION BATTERIES
First Claim
1. A lithium ion battery positive electrode material comprising an active composition represented by the formula Li1+xM1−
- xO2, where M is a metal element or a combination thereof and 0.01≦
x≦
0.3, coated with an inorganic coating composition wherein the coating composition comprises a metal/metalloid fluoride.
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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.
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Citations
25 Claims
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1. A lithium ion battery positive electrode material comprising an active composition represented by the formula Li1+xM1−
- xO2, where M is a metal element or a combination thereof and 0.01≦
x≦
0.3, coated with an inorganic coating composition wherein the coating composition comprises a metal/metalloid fluoride. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- xO2, where M is a metal element or a combination thereof and 0.01≦
- 10. A lithium ion battery comprising a positive electrode, a negative electrode comprising a lithium incorporation composition, a separator between the positive electrode and the negative electrode and an electrolyte comprising lithium ions, wherein the positive electrode comprises an active material, distinct electrically conductive powders and a polymer binder, wherein the positive electrode active material comprises an active composition coated with an inorganic coating composition, and the positive electrode active material having a discharge specific capacity of at least about 190 mAh/g with a discharge rate of 2 C from 4.6 volts to 2.0 volts at room temperature for the fifteenth charge/discharge cycle.
- 19. A lithium ion battery comprising a positive electrode, a negative electrode comprising a lithium incorporation composition and a separator between the positive electrode and the negative electrode, wherein the positive electrode comprises an active material having an active composition coated with an inorganic composition, distinct electrically conductive powers and a polymer binder, the positive electrode active material having a discharge specific capacity of at least about 245 mAh/g, an average voltage of at least about 3.55 volts and a capacity at 40 cycles that is at least about 90% of the capacity at 10 cycles with a discharge rate of C/3 from 4.6 volts to 2.0 volts at room temperature.
Specification