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| Home > Publications database > On the Beneficial Impact of Li 2 CO 3 as Electrolyte Additive in NCM523 ∥ Graphite Lithium Ion Cells Under High‐Voltage Conditions > print |
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| 100 | 1 | _ | |a Klein, Sven |0 P:(DE-HGF)0 |b 0 |
| 245 | _ | _ | |a On the Beneficial Impact of Li 2 CO 3 as Electrolyte Additive in NCM523 ∥ Graphite Lithium Ion Cells Under High‐Voltage Conditions |
| 260 | _ | _ | |a Weinheim |c 2021 |b Wiley-VCH |
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| 520 | _ | _ | |a Lithium ion battery cells operating at high‐voltage typically suffer from severe capacity fading, known as ‘rollover’ failure. Here, the beneficial impact of Li2CO3 as an electrolyte additive for state‐of‐the‐art carbonate‐based electrolytes, which significantly improves the cycling performance of NCM523 ∥ graphite full‐cells operated at 4.5 V is elucidated. LIB cells using the electrolyte stored at 20 °C (with or without Li2CO3 additive) suffer from severe capacity decay due to parasitic transition metal (TM) dissolution/deposition and subsequent Li metal dendrite growth on graphite. In contrast, NCM523 ∥ graphite cells using the Li2CO3‐containing electrolyte stored at 40 °C display significantly improved capacity retention. The underlying mechanism is successfully elucidated: The rollover failure is inhibited, as Li2CO3 reacts with LiPF6 at 40 °C to in situ form lithium difluorophosphate, and its decomposition products in turn act as ‘scavenging’ agents for TMs (Ni and Co), thus preventing TM deposition and Li metal formation on graphite. |
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| 700 | 1 | _ | |a Winter, Martin |0 P:(DE-Juel1)166130 |b 10 |e Corresponding author |
| 700 | 1 | _ | |a Placke, Tobias |0 0000-0002-2097-5193 |b 11 |e Corresponding author |
| 773 | _ | _ | |a 10.1002/aenm.202003756 |g Vol. 11, no. 10, p. 2003756 - |0 PERI:(DE-600)2594556-7 |n 10 |p 2003756 - |t Advanced energy materials |v 11 |y 2021 |x 1614-6840 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/892524/files/aenm.202003756.pdf |y OpenAccess |
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