Amorphous Li-Zr-O layer coating on the surface of high-Ni cathode materials for lithium ion batteries

作者：Lim Young Jin; Lee Sun Me; Lim Hayoung; Moon Bora; Han Kyu Sung; Kim Jin Ho; Song Jun Ho; Yu Ji Sang; Cho Woosuk^*; Park Min Sik^*

来源：Electrochimica Acta, 2018, 282: 311-316.

DOI：10.1016/j.electacta.2018.06.062

• Surface coating
• Layered transition metal oxide
• Cathode
• Lithium ion batteries
• Electrochemistry

Improving cycle performance and rate-capability of lithium ion batteries is necessary in moving toward their use in electric vehicles. Working towards this goal, we propose an amorphous Li-Zr-O coating on the surface of a high-Ni layered transition metal oxide (LiNi0.8Co0.1Mn0.1O2) via a simple wet process. By using residual Li on the surface of as-prepared LiNi0.8Co0.1Mn0.1O2 particles as a Li source, a non-stoichiometric Li-Zr-O compound can be successfully formed on the surface of LiNi0.8Co0.1Mn0.1O2 particles at a low temperature of 400 degrees C. The formation of an amorphous Li-Zr-O layer is beneficial in minimizing undesirable side reactions associated with residual Li at the surface and, by extension, improving the cycle performance and rate-capability of LiNi0.8Co0.1Mn0.1O2. The amorphous Li-Zr-O coated LiNi0.8Co0.1Mn0.1O2 exhibits a high reversible capacity of more than 190 mAh g(-1) with improved cycle performance. This simple approach offers easy control of the surface characteristics of LiNi0.8Co0.1Mn0.1O2, improving the surface stability and enhancing the thermal stability.

• 出版日期2018-8-20