Mitigating storage-induced degradation of Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode material by surface tuning with phosphate
- Authors
- Ryu, Won-Gyue; Shin, Hyun-Seop; Park, Min-Sik; Kim, Hansung; Jung, Kyu-Nam; Lee, Jong-Won
- Issue Date
- Aug-2019
- Publisher
- ELSEVIER SCI LTD
- Keywords
- LiNi0.8CO0.1Mn0.1O2; Surface tuning; Lithium phosphate; Storage stability; Residual lithium
- Citation
- CERAMICS INTERNATIONAL, v.45, no.11, pp.13942 - 13950
- Indexed
- SCIE
SCOPUS
- Journal Title
- CERAMICS INTERNATIONAL
- Volume
- 45
- Number
- 11
- Start Page
- 13942
- End Page
- 13950
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/189458
- DOI
- 10.1016/j.ceramint.2019.04.092
- ISSN
- 0272-8842
- Abstract
- The Ni-rich LiNi0.8Co0.1Mn0.1O2 layered oxide (NCM811) is attracting considerable attention as a high-capacity cathode material for rechargeable Li-ion batteries. However, due to its inherent structural/chemical/electrochemical instability, NCM811 with high Ni content suffers from significant performance degradation upon storage even in ambient atmospheres as well as during charge-discharge cycling. Herein, we demonstrate a simple but effective surface-tuning approach to mitigate storage-induced degradation of NCM811, which is based on the conversion of undesirable Li residues to a protective Li3PO4 nanolayer via phosphate treatment. The accelerated storage stability test shows that phosphate-modified NCM811 exhibits remarkably improved electrochemical performance (capacity, cycle life, and rate capability) over the pristine one after being stored under harsh environmental conditions. A combined analytical study indicates that surface tuning through phosphate treatment enhances the storage stability of NCM811 by eliminating impurity-forming Li residues and producing a Li3PO4 nanolayer that inhibits parasitic reactions at the electrode-electrolyte interface. Furthermore, Li3PO4 provides an effective barrier to H2O and CO2 infiltration into the particle agglomerates, thereby suppressing the loss of particle integrity.
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