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Effect of Lithium Silicate Addition on the Microstructure and Crack Formation of LiNi0.8Co0.1Mn0.1O2 Cathode Particles
journal contribution
posted on 2019-10-18, 18:33 authored by Satoshi Hashigami, Yukihiro Kato, Kei Yoshimi, Akihiro Fukumoto, Ziyang Cao, Hiroyuki Yoshida, Toru Inagaki, Michihiro Hashinokuchi, Masakazu Haruta, Takayuki Doi, Minoru InabaThe
microstructure of LiNi0.8Co0.1Mn0.1O2 cathode materials was controlled by the addition
of lithium silicate, and the influence on the cycle performance and
the rate capability was investigated. Si was not included within the
lattice, but localized at the grain boundaries of the primary particles
and the pores inside the secondary particles. The addition of the
lithium silicate greatly decreased the density of the pores between
the primary particles and improved the density of the secondary particles.
The capacity retention was successfully improved for lithium silicate-added
LiNi0.8Co0.1Mn0.1O2. When
lithium silicate-free LiNi0.8Co0.1Mn0.1O2 was charged to 4.3 V, many cracks were formed along
the grain boundaries even in the first cycle, while crack formation
was remarkably inhibited for lithium silicate-added LiNi0.8Co0.1Mn0.1O2. Moreover, lithium
silicate-added LiNi0.8Co0.1Mn0.1O2 particles were almost free from visible microcracks even
after 100 cycles at the discharged state. These results suggest that
the lithium silicate reinforces the grain-adhesion at the grain boundaries,
inhibiting crack formation and electrolyte decomposition inside the
cracks.
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crack formationlithium silicate-free LiNi 0.8 Co 0.1 Mn 0.1 O 2LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode materialslithium silicate-added LiNi 0.8 Co 0.1 Mn 0.1 O 2LiNi 0.8 Co 0.1 Mn 0.1 O 2 Cathode ParticlesLithium Silicate Additionlithium silicategrain boundarieslithium silicate-added LiNi 0.8 Co 0.1 Mn 0.1 O 2 particles
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