| 摘要 |
A composite electrode material is fabricated from a first electroactive material which, when incorporated into a cathode of a rechargeable battery, manifests a first mean voltage, a first energy density and a first high cutoff voltage cycle life; and a second electroactive material which, when incorporated into a cathode of the rechargeable battery, manifests a second mean voltage which is less than the first mean voltage, a second energy density which is less than the first energy density, and a second high voltage cutoff cycle life which is greater than the first cycle life. The composite material is characterized in that when it is incorporated into a cathode of the rechargeable battery, it manifests at least one of: a third mean voltage which is greater than the second mean voltage, a third energy density which is greater than the second energy density, and a third high cutoff voltage cycle life which is greater than the first cycle life. The rate performance of the second material, when incorporated into a rechargeable battery, may be greater than the rate performance of the first material when incorporated into the rechargeable battery, and the rate performance of the composite material, when incorporated into a cathode of the rechargeable battery, is greater than the first rate performance. The composite material may include a simple mixture of particles of the first and second materials, or may comprise a complex structure such as a core/shell structure wherein the second material covers a portion of the surface of particles of the first material. Also disclosed herein are electrodes which incorporate the material, batteries which incorporate the electrodes, and methods for making the foregoing.
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