title: Li-rich Li-Si alloy as a lithium-containing negative electrode material towards high energy lithium-ion batteries.
abstract: Lithium-ion batteries (LIBs) are generally constructed by lithium-including positive electrode materials, such as LiCoO2, and lithium-free negative electrode materials, such as graphite. Recently, lithium-free positive electrode materials, such as sulfur, are gathering great attention from their very high capacities, thereby significantly increasing the energy density of LIBs. Though the lithium-free materials need to be combined with lithium-containing negative electrode materials, the latter has not been well developed yet. In this work, the feasibility of Li-rich Li-Si alloy is examined as a lithium-containing negative electrode material. Li-rich Li-Si alloy is prepared by the melt-solidification of Li and Si metals with the composition of Li21Si5. By repeating delithiation/lithiation cycles, Li-Si particles turn into porous structure, whereas the original particle size remains unchanged. Since Li-Si is free from severe constriction/expansion upon delithiation/lithiation, it shows much better cyclability than Si. The feasibility of the Li-Si alloy is further examined by constructing a full-cell together with a lithium-free positive electrode. Though Li-Si alloy is too active to be mixed with binder polymers, the coating with carbon-black powder by physical mixing is found to prevent the undesirable reactions of Li-Si alloy with binder polymers, and thus enables the construction of a more practical electrochemical cell.
authors: 1] Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan [2] Division of Chemical Process Engineering, Graduate School of Engineering, Hokkaido University, N13W8 Kita-ku, Sapporo 060-8628, Japan.
authors: Shinichiroh
authors: S
authors: Iwamura
authors: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
authors: Hirotomo
authors: H
authors: Nishihara
authors: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
authors: Yoshitaka
authors: Y
authors: Ono
authors: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
authors: Haruhiko
authors: H
authors: Morito
authors: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
authors: Hisanori
authors: H
authors: Yamane
authors: Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan.
authors: Hiroki
authors: H
authors: Nara
authors: Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan.
authors: Tetsuya
authors: T
authors: Osaka
authors: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
authors: Takashi
authors: T
authors: Kyotani
references: Science. 2011 Oct 7;334(6052):75-9
references: 21903777
references: Nat Nanotechnol. 2008 Jan;3(1):31-5
references: 18654447
references: Phys Chem Chem Phys. 2013 May 21;15(19):7045-9
references: 23575639
references: ACS Nano. 2014 Jan 28;8(1):915-22
references: 24313423
references: Nat Mater. 2010 Apr;9(4):353-8
references: 20228818
references: Nat Commun. 2014;5:5088
references: 25277107
references: Adv Mater. 2012 Aug 28;24(33):4473-98
references: 22806880
references: J Phys Chem Lett. 2012 Dec 6;3(23):3555-8
references: 26290987
references: Nat Mater. 2005 May;4(5):366-77
references: 15867920
references: Nature. 2001 Nov 15;414(6861):359-67
references: 11713543
references: Angew Chem Int Ed Engl. 2010 Mar 15;49(12):2146-9
references: 20175170
references: Nano Lett. 2008 Nov;8(11):3688-91
references: 18950239
references: Chem Rev. 2004 Oct;104(10):4271-301
references: 15669156
references: Nano Lett. 2010 May 12;10(5):1710-6
references: 20369889
references: Nano Lett. 2009 Sep;9(9):3370-4
references: 19655765