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- W3128697756 abstract "The increase of specific energy of current Li ion batteries via further increase of the cell voltage, for example, to 4.5 V is typically accompanied by a sudden and rapid capacity fade, known as “rollover” failure. This failure is the result of Li dendrite formation triggered in the course of electrode cross-talk, that is, dissolution of transition metals (TMs) from the cathode and deposition on the anode. It is shown herein, that the elimination of ethylene carbonate (EC) from a state-of-the-art electrolyte, that is, from 1.0 m LiPF6 in a 3:7 mixture of EC and ethyl methyl carbonate prevents this failure in high-voltage LiNi0.5Co0.2Mn0.3O2||graphite cells, even without any electrolyte additives. While the oxidative stability on the cathode side is similar in both electrolytes, visible by a decomposition plateau at 5.5 V versus Li|Li+ during charge, the anode side in the EC-free electrolyte reveals significantly less TM deposits and Li metal dendrites compared to the EC-based electrolyte. The beneficial effect of EC-free electrolytes is related to a significantly increased amount of degraded LiPF6 species, which effectively trap dissolved TMs and suppress the effect of detrimental cross-talk, finally realizing rollover-free performance under high voltage conditions." @default.
- W3128697756 created "2021-02-15" @default.
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- W3128697756 date "2021-01-29" @default.
- W3128697756 modified "2023-10-16" @default.
- W3128697756 title "Understanding the Outstanding High‐Voltage Performance of NCM523||Graphite Lithium Ion Cells after Elimination of Ethylene Carbonate Solvent from Conventional Electrolyte" @default.
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- W3128697756 doi "https://doi.org/10.1002/aenm.202003738" @default.
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