Cargando…

In situ inorganic conductive network formation in high-voltage single-crystal Ni-rich cathodes

High nickel content in LiNi(x)Co(y)Mn(z)O(2) (NCM, x ≥ 0.8, x + y + z = 1) layered cathode material allows high specific energy density in lithium-ion batteries (LIBs). However, Ni-rich NCM cathodes suffer from performance degradation, mechanical and structural instability upon prolonged cell cyclin...

Descripción completa

Detalles Bibliográficos
Autores principales: Fan, Xinming, Ou, Xing, Zhao, Wengao, Liu, Yun, Zhang, Bao, Zhang, Jiafeng, Zou, Lianfeng, Seidl, Lukas, Li, Yangzhong, Hu, Guorong, Battaglia, Corsin, Yang, Yong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8423756/
https://www.ncbi.nlm.nih.gov/pubmed/34493735
http://dx.doi.org/10.1038/s41467-021-25611-6
Descripción
Sumario:High nickel content in LiNi(x)Co(y)Mn(z)O(2) (NCM, x ≥ 0.8, x + y + z = 1) layered cathode material allows high specific energy density in lithium-ion batteries (LIBs). However, Ni-rich NCM cathodes suffer from performance degradation, mechanical and structural instability upon prolonged cell cycling. Although the use of single-crystal Ni-rich NCM can mitigate these drawbacks, the ion-diffusion in large single-crystal particles hamper its rate capability. Herein, we report a strategy to construct an in situ Li(1.4)Y(0.4)Ti(1.6)(PO(4))(3) (LYTP) ion/electron conductive network which interconnects single-crystal LiNi(0.88)Co(0.09)Mn(0.03)O(2) (SC-NCM88) particles. The LYTP network facilitates the lithium-ion transport between SC-NCM88 particles, mitigates mechanical instability and prevents detrimental crystalline phase transformation. When used in combination with a Li metal anode, the LYTP-containing SC-NCM88-based cathode enables a coin cell capacity of 130 mAh g(−1) after 500 cycles at 5 C rate in the 2.75-4.4 V range at 25 °C. Tests in Li-ion pouch cell configuration (i.e., graphite used as negative electrode active material) demonstrate capacity retention of 85% after 1000 cycles at 0.5 C in the 2.75-4.4 V range at 25 °C for the LYTP-containing SC-NCM88-based positive electrode.