Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

High Performance Lithium-Rich Layered Oxide Material: Effects of Preparation Methods on Microstructure and Electrochemical Properties

Qiming Liu
,
Huali Zhu
ORCID logo ,
Jun Liu
,
Xiongwei Liao
,
Zhuolin Tang
,
Cankai Zhou
,
Mengming Yuan
,
Junfei Duan
,
Lingjun Li
,
Zhaoyong Chen
* ORCID logo
Version 1 : Received: 10 December 2019 / Approved: 12 December 2019 / Online: 12 December 2019 (02:05:17 CET)

A peer-reviewed article of this Preprint also exists.

Liu, Q.; Zhu, H.; Liu, J.; Liao, X.; Tang, Z.; Zhou, C.; Yuan, M.; Duan, J.; Li, L.; Chen, Z. High-Performance Lithium-Rich Layered Oxide Material: Effects of Preparation Methods on Microstructure and Electrochemical Properties. Materials 2020, 13, 334. Liu, Q.; Zhu, H.; Liu, J.; Liao, X.; Tang, Z.; Zhou, C.; Yuan, M.; Duan, J.; Li, L.; Chen, Z. High-Performance Lithium-Rich Layered Oxide Material: Effects of Preparation Methods on Microstructure and Electrochemical Properties. Materials 2020, 13, 334.

Abstract

Lithium-rich layered oxides is one of the most perspective candidates for cathode materials of lithium ion battery, because of its high discharge capacity. However, there are some disadvantages of uneven composition, voltage decay, and poor rate capacity, which are closely related to the preparation method. Here, 0.5Li2MnO3·0.5LiMn0.8Ni0.1Co0.1O2 were successfully prepared by sol-gel and oxalate co-precipitation methods. A systematic analysis of the materials shows that the 0.5Li2MnO3·0.5LiMn0.8Ni0.1Co0.1O2 prepared by the oxalic acid co-precipitation method has the most stable layered structure and the best electrochemical performance. The initial discharge specific capacity is 261.6 mAh·g-1 at 0.05 C, and the discharge specific capacity is 138 mAh·g-1 at 5 C. The voltage decay is only 210 mV, and the capacity retention is 94.2% after 100 cycles at 1 C. The suppression of voltage decay can be attributed to the high nickel content and uniform element distribution. In addition, tightly packed porous spheres help to reduce lithium ion diffusion energy and improve the stability of the layered structure, thereby improving cycle stability and rate capacity. This conclusion provides a reference for designing high energy density lithium-ion batteries.

Keywords

lithium-rich layered oxide; cathode material; 0.5Li2MnO3·0.5LiMn0.8Ni0.1Co0.1O2; voltage decay; co-precipitation method; sol–gel method

Subject

Chemistry and Materials Science, Materials Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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