期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 40, 页码 36697-36704出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b12113
关键词
Ni-rich cathode material; secondary co-precipitation; active-plane-exposing shell; compacted core; hierarchical structure
资金
- National Key R&D Program of China [2016YFB0100301]
- National Natural Science Foundation of China [21875022, 51802020, U1664255]
- Young Elite Scientists Sponsorship Program by CAST [2018QNRC001]
- Beijing Institute of Technology Research Fund Program for Young Scholars
- Beijing Institute of Technology (BIT) Teli Young Fellow Program [3090011181903]
To simultaneously achieve high compaction density and superior rate performance, a structure-gradient LiNi0.8Co0.1Mn0.1O2 cathode material composed by a compacted core and an active-plane-exposing shell was designed and synthesized via a secondary co-precipitation method successfully. The tight stacking of primary particles in the core part ensures high compaction density of the material, whereas the exposed active planes, resulting from the stacking of primary nanosheets along the [001] crystal axis predominantly, in the shell region afford enhanced Li+ transport. Thus, this structure-gradient Ni-rich cathode material shows a high compaction density with excellent electrochemical performances, especially the rate performance, exhibiting excellent rate capability (160 mA h g(-1) at 10 C), which is 62% larger than that of the pristine material within 2.75-4.3 V (vs Li+/Li). Our work proposes a possible strategy for designing and synthesizing layered cathode materials with the required hierarchical structure to meet different application requirements.
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