Details

Autor(en) / Beteiligte

• Liu, Shuaiwei
• Li, Yunjiao
• Wang, Shilei
• Chen, Yongxiang
• Tan, Zhouliang
• Yang, Jiachao
• Deng, Shiyi
• He, Zhenjiang
• Li, Chunxia

Titel

Towards superior cyclability of LiNi0.8Co0.15Al0.05O2 cathode material for lithium ion batteries via yttrium modification

Ist Teil von

• Journal of alloys and compounds, 2021-09, Vol.874, p.159713, Article 159713

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2021

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• The surface instability and the structure degradation in Ni-rich cathode materials have been considered to the primary issues causing the severe capacity fading. In this study, a viable and effective approach to fabricate the yttrium modified LiNi0.8Co0.15Al0.05O2 (NCA) cathode materials with higher electrochemical performance by solid-state method is reported. The yttrium modified materials exhibit a notably enhanced electrochemical performance, which delivers a discharge capacity of 169.8 mAh g−1 over 3.0–4.3 V at 1 C corresponding capacity retention of 95.3% after 200 cycles. Besides, the capacity of the modified materials at higher rate (8 C) increase to 156.9 mAh g−1. With a careful and in-depth investigation, we found that the improved electrochemical performance can be attributed to the Y doping, which provides a powerful Y-O bond in the transition metal layers and effectively improves the structure stability. Additionally, the Ni2+ existing in the Li slabs to some extent exert a positive effect on suppressing the further cation migration and stabilizing the lithium slabs. Based on our work, we believe the modification strategy has the potential application in the cathode materials. •A strategy of Y modification.•The enhanced structural stability.•The excellent cyclic performance.