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Boosting performance of Co-free Li-rich cathode material through regulating the anionic activity by means of the strong Ta O bonding by Chao Wu; Heng Li; Shuang Cao; Zhi Li; Peng Zeng; Jiarui Chen; Xitong Zhu; Xiaowei Guo; Gairong Chen; Baobao Chang; Yongqiang Shen; Xianyou Wang is a Chemistry article available to read on EtoBox.

What is Boosting performance of Co-free Li-rich cathode material through regulating the anionic activity by means of the strong Ta O bonding about?

Benefiting from the extra contribution of O redox, Co-free Li-rich layered oxides (LRNMO) can satisfy the requirement of high specific capacities. However, during the high-voltage charging process, lattice oxygen being oxidized to O− or O2 leads to a gradual transition of the structure from layered to spinel phase, capacity and voltage decline, hindering the practical application of LRNMO in the lithium-ion battery. Here, a surface modification strategy of Li1.2Ni0.32Mn0.48O2-δ doped with Ta5+ ions is proposed, in which the Ta5+ ions occupy the lithium sites of the lattice structure on the surface layer of LRNMO and form a Ta2O5 coating layer. The modified electrode exhibits excellent rate performance and cycling stability, with 94.9% and 85.5% capacity retention rate and voltage retention rate, respectively, after 200 cycles at 1C. Moreover, the initial coulomb efficiency and ionic conductivity of the modified electrode are also apparently enhanced. Simultaneously, the decreased Li/Ni mixing degree of the modified electrode reflects the improvement of the structural stability. Therefore, the modification strategy through strong metal–oxygen bonding to integrate the surface structu

Who reads Boosting performance of Co-free Li-rich cathode material through regulating the anionic activity by means of the strong Ta O bonding?

Author

Chao Wu; Heng Li; Shuang Cao; Zhi Li; Peng Zeng; Jiarui Chen; Xitong Zhu; Xiaowei Guo; Gairong Chen; Baobao Chang; Yongqiang Shen; Xianyou Wang

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Chemistry (Physical Sciences)