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Incorporation of Titanium into Ni-Rich Layered Cathode Materials for Lithium-Ion Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-11-24 , DOI: 10.1021/acsaem.0c02258
Jong Hwa Kim 1 , Hyuntae Kim 2 , Won-Joo Kim 2 , Yong-Chan Kim 1 , Jae Yup Jung 1 , Dong Young Rhee 1 , Jun Ho Song 2 , Woosuk Cho 2 , Min-Sik Park 1
Affiliation  

In the development of a reliable cathode material for lithium-ion batteries (LIBs), it is crucial to clearly understand the structural degradation mechanism and its correlation with the electrochemical performance. In this context, herein, we thoroughly investigate the positive effects of Ti incorporation into the bulk structure of a Ni-rich layered cathode material, LiNi0.8Co0.1Mn0.1O2 (NCM811). As a result, the structural integrity and thermal stability of NCM811 particles can be enhanced, leading to a noticeable improvement in the cycle performance even at a high temperature of 60 °C. From a postmortem analysis, we confirm that Ti incorporation would enhance the structural integrity between primary particles by suppressing the undesirable grain boundary corrosion in the particles. Thus, Ti incorporation is beneficial for improving the cycle stability and thermal stability of NCM811. Our findings on the correlation between the structural evolution and electrochemical performance of Ti-incorporated NCM811 provide practical guidelines to develop advanced cathode materials for high-energy LIBs.

中文翻译:

将钛掺入用于锂离子电池的富镍多层阴极材料中

在开发可靠的锂离子电池(LIB)阴极材料时,至关重要的是清楚了解结构降解机理及其与电化学性能的关系。在本文中,我们彻底研究了将Ti掺入富Ni层状正极材料LiNi 0.8 Co 0.1 Mn 0.1 O 2的整体结构中的积极作用。(NCM811)。结果,可以提高NCM811颗粒的结构完整性和热稳定性,即使在60°C的高温下也可以显着改善循环性能。从事后分析中,我们证实,Ti的掺入将通过抑制颗粒中不希望的晶界腐蚀来增强一次颗粒之间的结构完整性。因此,Ti的掺入有利于改善NCM811的循环稳定性和热稳定性。我们对掺钛的NCM811的结构演变与电化学性能之间相关性的发现为开发用于高能LIB的先进阴极材料提供了实用指南。
更新日期:2020-12-28
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