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A New Type of Protective Surface Layer for High-Capacity Ni-Based Cathode Materials: Nanoscaled Surface Pillaring Layer
Abstract
A solid solution series of lithium nickel metal oxides, Li[Ni(1-x)M(x)]O2 (with M = Co, Mn, and Al) have been investigated intensively to enhance the inherent structural instability of LiNiO2. However, when a voltage range of Ni-based cathode materials was increased up to >4.5 V, phase transitions occurring above 4.3 V resulted in accelerated formation of the trigonal phase (P3m1) and NiO phases, leading to and pulverization of the cathode during cycling at 60 °C. In an attempt to overcome these problems, LiNi0.62Co0.14Mn0.24O2 cathode material with pillar layers in which Ni(2+) ions were resided in Li slabs near the surface having a thickness of ∼10 nm was prepared using a polyvinylpyrrolidone (PVP) functionalized Mn precursor coating on Ni0.7Co0.15Mn0.15(OH)2. We confirmed the formation of a pillar layer via various analysis methods (XPS, HRTEM, and STEM). This material showed excellent structural stability due to a pillar layer, corresponding to 85% capacity retention between 3.0 and 4.5 V at 60 °C after 100 cycles. In addition, the amount of heat generation was decreased by 40%, compared to LiNi0.70Co0.15Mn0.15O2.
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Shannon, R. D. (1976) · Acta Crystallographica Section A · doi:10.1107/s0567739476001551 · Cited by 66,145
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Gradient Li-rich oxide cathode particles immunized against oxygen release by a molten salt treatment
Zhu, Z., Yu, D., Yang, Y., Su, C., Huang, Y., Dong, Y., Waluyo, I., Wang, B., Hunt, A., Yao, X., et al. (2019) · Nature Energy · doi:10.1038/s41560-019-0508-x · Cited by 371
Yang, J., & Xia, Y. (2016) · ACS Applied Materials & Interfaces · doi:10.1021/acsami.5b09938 · Cited by 334
Metadata
- Authors
- Cho, Y., Oh, P., & Cho, J.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2013-03-01
- Volume
- 13
- Issue
- 3
- Pages
- 1145-1152
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2330975386
- Cited by
- 501
- References
- 1
- FWCI
- 16.58
- Type
- journal article
- Language
- en
- Open access
- closed
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- Cho, Y., Oh, P., & Cho, J. (2013). A New Type of Protective Surface Layer for High-Capacity Ni-Based Cathode Materials: Nanoscaled Surface Pillaring Layer. Nano Letters. https://doi.org/10.1021/nl304558t
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