Dai, Z;
Zhao, H;
Chen, W;
Zhang, Q;
Song, X;
He, G;
Zhao, Y;
... Bai, Y; + view all
(2022)
In Situ Construction of Gradient Oxygen Release Buffer and Interface Cation Self-Accelerator Stabilizing High-Voltage Ni-Rich Cathode.
Advanced Functional Materials
, 32
(49)
, Article 2206428. 10.1002/adfm.202206428.
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Abstract
Ni-rich cathodes with superior energy densities have spurred extensive attention for lithium-ion batteries (LIBs), whereas their commercialization is hampered by structural degradation, thermal runaway, and dramatic capacity fading. Herein, boron (B) with high binding energy to oxygen (O) is gradiently incorporated into each primary particle and piezoelectric Li2B4O7 (LBO) is homogeneously deposited on the secondary particles of polycrystalline LiNi0.8Co0.1Mn0.1O2 (NCM811) surface through a facile in situ construction strategy, intending to synchronously enhance electrochemical stabilities and Li+ kinetics upon cycling. Particularly, the as-obtained LBO modified NCM811 cathode exhibits an excellent capacity retention (88.9% after 300 cycles, 1 C) and rate performance (112.2 mAh g−1, 10 C) with Li metal anode, the NCM811-LBO/Li4Ti5O12 full cell achieves a capacity retention of 92.6% after 1000 cycles (0.5 C). Intensive explorations in theoretical calculation, multi-scale in/ex situ characterization and finite element analysis ascertain that the improvement mechanism of LBO modification can be attributed to the synergistic contributions of rational designed O release buffer and interface cation self-accelerator. This study provides a facile and practical method to prevent structural degradation and thermal runaway for high-energy LIBs.
| Type: | Article |
|---|---|
| Title: | In Situ Construction of Gradient Oxygen Release Buffer and Interface Cation Self-Accelerator Stabilizing High-Voltage Ni-Rich Cathode |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/adfm.202206428 |
| Publisher version: | https://doi.org/10.1002/adfm.202206428 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | in situ constructions, Ni-rich cathodes, oxygen release, stress-strain, structural and electrochemical stabilities |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10157849 |
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