Journal
JOURNAL OF POWER SOURCES
Volume 478, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228737
Keywords
Nickel-rich NCA cathode; Mn-doped; Grain growth; Lithium ion battery
Funding
- National Natural Science Foundation of China [21336005]
- Ministry of Science and Technology of China [2014EG111224]
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Controllable microstructure growth is desirable for materials to achieve optimized performance. Herein, we demonstrate that LiNi0.8Co0.15Al0.05O2, a promising cathode for lithium ion batteries toward high energy density, can be crystallized in a Mn-rich confined environment, leading to the regulation of the size of primary grains. As a result, the material with the Mn-content of 3 wt% exhibits a substantial enhancement in capacity retention of 81% after 900 cycles at 2 C between 2.8 and 4.3 V, relative to the corresponding value of 55% for the pristine counterpart. The exceptional performance is further highlighted by the full cell with the Mn-doped LiNi0.8Co0.15Al0.05O2 cathode and Li4Ti5O12 as the anode, exhibiting capacity retention of 86% after 1000 cycles. This mainly means that the reduction of the size of the primary grains in the integrated structure can alleviate the intrinsic internal strain induced by delithiation/lithiation of the material and consequently diminish the formation of microcracks in the nickel-rich materials.
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