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Title: Prelithiated Li-Enriched Gradient Interphase toward Practical High-Energy NMC–Silicon Full Cell

Journal Article · · ACS Energy Letters

It is highly desirable to realize high-energy-density lithium-ion batteries consisting of nickel-rich layered oxide cathodes (Ni-rich NMC) and Si-based anodes. A critical challenge for Ni-rich NMC is its fast capacity degradation. In addition, the low initial Coulombic efficiency of the Si-based anode consumes the electrochemically active lithium from the cathode and decreases the energy density of full batteries considerably. Here, we consider cathode and anode as a whole to simultaneously resolve the issues of both sides. Ni-rich LiNi0.65Mn0.20Co0.15O2 (LR-Ni65) consisting of a lithium-enriched gradient interphase layer (~20 nm) is designed to supply excess electrochemically active lithium to compensate lithium loss at the anode and enhance cycling stability through regulating Li/Ni disorder in the cathode structure. We show that a LR-Ni65||Si/graphite pouch cell displays a capacity (3.29 Ah) greater than that for the counterpart using pristine Ni-rich NMC (2.95 Ah), as well as enhanced cycling stability with 88% capacity retention. The good compatibility with current Ni-rich NMC processing and facile synthesis make the as-fabricated cathode material promising for practical commercial application.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC); Guangdong Basic and Applied Basic Research Foundation
Grant/Contract Number:
SC0012704; AC02-06CH11357; 52072137; 52002136; 51802105; 2020T130216; 2018M642833; 2019A1515012060; 2019B1515120028
OSTI ID:
1756180
Alternate ID(s):
OSTI ID: 1831727
Report Number(s):
BNL-220766-2020-JAAM
Journal Information:
ACS Energy Letters, Vol. 6, Issue 2; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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