Designed seamless outer surface

Application for high voltage LiNi0.5Mn1.5O4 cathode with excellent cycling stability

Kan Zhang, Ping Li, Ming Ma, Jong Hyeok Park

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Suppressing side reactions at the cathode-electrolyte interface (CEI) is critical for alleviating capacity fading of the high-voltage (>5 V) spinel cathode material LiNi0.5Mn1.5O4 (LNMO). The primary bottleneck in conventional nanoengineering of LNMO involves an antagonistic relationship between the positive effects of the nanometer particle size and negative effects stemming from the larger CEI area. Inspired by Buckminster Fuller's geodesic domes, we have designed a seamless LNMO hollow sphere (S-LNMO) that comprises average 120 nm-sized triangles and truncated triangle subunits by means of grain growth orientation. The “tensegrity” structure has efficiently hindered the interfacial side reaction, which occurs only within a depth of 5 nm from the surface, thereby improving its electrochemical stability. The embedded layered Li2TiO3 (LTO) in bulk S-LNMO (LTO:S-LNMO) region further improved the high-rate performance, demonstrating an ∼110 mAh/g capacity with 80.9% retention after 400 cycles at 5 C and remaining stable after 900 cycles at 5 C even after being stored at 50 °C for one week.

Original languageEnglish
Pages (from-to)307-315
Number of pages9
JournalJournal of Power Sources
Volume336
DOIs
Publication statusPublished - 2016 Dec 30

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high voltages
Cathodes
cathodes
triangles
Electrolytes
cycles
tensegrity structures
Electric potential
electrolytes
Domes
fading
domes
Grain growth
spinel
hollow
Particle size
spinell

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

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abstract = "Suppressing side reactions at the cathode-electrolyte interface (CEI) is critical for alleviating capacity fading of the high-voltage (>5 V) spinel cathode material LiNi0.5Mn1.5O4 (LNMO). The primary bottleneck in conventional nanoengineering of LNMO involves an antagonistic relationship between the positive effects of the nanometer particle size and negative effects stemming from the larger CEI area. Inspired by Buckminster Fuller's geodesic domes, we have designed a seamless LNMO hollow sphere (S-LNMO) that comprises average 120 nm-sized triangles and truncated triangle subunits by means of grain growth orientation. The “tensegrity” structure has efficiently hindered the interfacial side reaction, which occurs only within a depth of 5 nm from the surface, thereby improving its electrochemical stability. The embedded layered Li2TiO3 (LTO) in bulk S-LNMO (LTO:S-LNMO) region further improved the high-rate performance, demonstrating an ∼110 mAh/g capacity with 80.9{\%} retention after 400 cycles at 5 C and remaining stable after 900 cycles at 5 C even after being stored at 50 °C for one week.",
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Designed seamless outer surface : Application for high voltage LiNi0.5Mn1.5O4 cathode with excellent cycling stability. / Zhang, Kan; Li, Ping; Ma, Ming; Park, Jong Hyeok.

In: Journal of Power Sources, Vol. 336, 30.12.2016, p. 307-315.

Research output: Contribution to journalArticle

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