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Multi-scale stabilization of high-voltage LiCoO2 enabled by nanoscale solid electrolyte coating

Journal Article · · Energy Storage Materials
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  1. Columbia Univ., New York, NY (United States)
  2. Columbia Univ., New York, NY (United States); Peking Univ., Beijing (China)
  3. Peking Univ., Beijing (China)
  4. Univ. of Science and Technology Beijing (China)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States)
  6. Jiangxi Normal Univ., Nanchang (China)
+ Show Author Affiliations
LiCoO2 (LCO) possess a high theoretical specific capacity of 274 mAh g-1, and currently LCO charged to 4.48 V with a capacity of ~190–195 mAh g-1 is penetrating the commercial markets. Scalable strategies to further enhance the performance of LCO are highly attractive. Here, we develop a scalable ball-milling and sintering method to tackle this long-standing challenge by modifying LCO surface with only 1.5–3.5% ceramic solid electrolyte nanoparticles, specifically Li1.5Al0.5Ge1.5(PO4)3 (LAGP) as an example. Consequently, the atomic-to-meso multiscale structural stabilities have been significantly improved, even with a high cut-off voltage of 4.5 V vs. Li/Li+, leading to excellent electrochemical stabilities. The nano-LAGP modified Li|LCO cell exhibits high discharge capacity of 196 mAh g-1 at 0.1 C, capacity retention of 88% over 400 cycles, and remarkably enhanced rate capability (163 mAh g-1 at 6 C). These results show significant improvement compared to the Li|LCO cells. The as-prepared graphite|LAGP-LCO full cells also show steady cycling with 80.4% capacity retention after 200 cycles with a voltage cut-off of 4.45 V. This work provides a simple and scalable approach to achieve stable cycling of LCO at high voltage with high energy density.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Organization:
China Scholarship Council (CSC); National Natural Science Foundation of China (NSFC); Research Corporation for Science Advancement; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1616943
Alternate ID(s):
OSTI ID: 1615380
Report Number(s):
BNL--215882-2020-JAAM
Journal Information:
Energy Storage Materials, Journal Name: Energy Storage Materials Journal Issue: C Vol. 29; ISSN 2405-8297
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
Energy density
High voltage
Li1.5Al0.5Ge1.5(PO4)3 nanoparticles
LiCoO2
Lithium battery