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• W4386796075 abstract "The steadily growing electric vehicle market is a driving force in low-cost, high-energy-density lithium-ion battery development. To meet this demand, LiNi0.975 Al0.025 O2 (LNA), a high-energy-density and cobalt-free cathode material, has been developed using a low-cost and efficient co-precipitation and lithiation process. This article explores how further processing (i.e., washing residual lithium from the secondary particle surface and applying a secondary heat treatment at 650 °C) changes the chemical environment of the surface and the electrochemical performance of the LNA cathode material. After washing, a nonconductive nickel oxide (NiO) phase is formed on the surface, decreasing the initial capacity in electrochemical tests, and suppressing high-voltage (H2) to (H3) phase transition results in enhanced cycle properties. Furthermore, the secondary heat treatment re-lithiates surface NiO back to LNAand increases the initial capacity with enhanced cycle properties. Electrochemical tests are performed with the cells without tap charge to suppress the H2 to H3 phase transition. Results reveal that avoiding charging cells at a high voltage for a long time dramatically improves LNA's cycle life. In addition, the gas analysis tests performed during charge and discharge to reveal how the amount of residual lithium compounds on the surface affects gas formation are studied." @default.
• W4386796075 created "2023-09-17" @default.
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• W4386796075 date "2023-09-15" @default.
• W4386796075 modified "2023-09-26" @default.
• W4386796075 title "Effect of Secondary Heat Treatment after a Washing on the Electrochemical Performance of Co‐Free LiNi_0.975Al_0.025O₂ Cathodes for Li‐Ion Batteries" @default.
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• W4386796075 doi "https://doi.org/10.1002/smll.202305349" @default.
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• W4386796075 hasPublicationYear "2023" @default.
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