Crystal structure, electronic structure, chemical bonding and defects in metal-ion battery materials
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1 Crystal structure, electronic structure, chemical bonding and defects in metal-ion battery materials Artem Abakumov Center for Electrochemical Energy Storage, Skoltech
2 Li-ion batteries Li x C 6 graphite Li + -conducting LiMO 2 electrolyte charge С 6 + LiCoO 2 discharge Li x C 6 + Li 1-x CoO 2 Voltage 3.6 V, x e - Electrolyte: Li-salt - LiPF 6, LiBF 4 (LiClO 4, LiAsF 6 ), LiCF 3 SO 3 Solvent ethylene carbonate (CH 2 O) 2 C, dimethyl carbonate (СH 3 O) 2 CO.
3 electrolyte stability window Rate capability Power Energy Cathode materials: key properties Property Voltage Capacity Ionic mobility Electronic conductivity Structural stability Cyclability M n+ /M (n+1)+ redox potential C T (A h g -1 ) = number of e - or Li Δn M Molecular weight (g) Energy = Voltage x Capacity V enhancing potential 4.8 V (vs. Li/Li + ) V C increasing capacity (multi-valent systems) C
4 Cathode materials Cathode LCO LNO NCA NMC LMO LFP Formula LiCoO 2 LiNiO 2 LiNi 0.85 Co 0.1 Al 0.05 O 2 LiNi 1/3 Mn 1/3 Co 1/3 O 2 LiMn 2 O 4 LiFePO 4 Average potential vs Li + /Li, V Capacity, ma h/g ~150 ~180 ~130 ~170 ~110 ~150 Specific energy, W h/kg ~550 ~650 ~480 ~660 ~440 ~500 Power Safety Life time Cost
5 Cathode materials Complex oxides Polyanion compounds LiCoO 2 LiNi 1/3 Mn 1/3 Co 1/3 O 2 LiMn 2 O 4, LiNi 0.5Mn 1.5O 4 LiFePO 4 2D Li transport 3D Li transport 1D Li transport
6 Bonding in oxides MO diagram for the MO 6 n- octahedral complex a building unit of many oxide structures M transition metal with the electronic configuration nd m (n+1)s 2 (n+1)p 0 M O
7 Bonding in oxides Metal Oxygen nd Metal Oxygen (n+1)s s bonding (n+1)p p bonding s bonding
8 BO 6 n- octahedron: MO diagram lowest unoccupied MO (LUMO) highest occupied MO (HOMO) Oxygens d 0 transition metal cation Ti: 3d 2 4s 2 4p 0 Ti 4+ : 3d 0 4s 0 4p 0 filled orbitals
9 BO 6 n- octahedron: MO diagram conductivity and magnetism is determined by collective properties of electrons on these orbitals Oxygen d 1 transition metal cation Ti: 3d 2 4s 2 4p 0 Ti 3+ : 3d 1 4s 0 4p 0
10 Simplified band structure Oxygens Transition metal
11 Energy ReO 3 : band structure M-O s* partially filled conduction band ReO 3 : Re +6 d 1, t 2g1 e g 0 M-O s* M-O p* M-O p M-O s valence band Density of states
12 NiO: metal or insulator? NiO: rock salt structure Oxygen Ni: 3d 8 4s 2 4p 0 Ni 2+ : 3d 8 4s 0 4p 0
13 NiO: metal or insulator?
14 Mott-Hubbard insulators electron transfer Coulomb repulsion energy U Ni 2+ + Ni 2+ Ni 3+ + Ni + d 8 + d 8 d 7 + d 9 Two competing trends: the kinetic energy acts to delocalize the electrons, leading to metallic behaviour. the electron-electron Coulomb repulsion energy U wants to localize the electrons on sites. E Upper Hubbard Band E+U UHB bandwidth W Lower Hubbard Band E LHB bandwidth W DoS
15 Mott-Hubbard insulators Mott-Hubbard scheme of the metal-to-insulator (MI) transition E U > W E U = W E U < W UHB UHB U U U LHB LHB DoS DoS DoS Insulator Metal
16 Mott-Hubbard vs charge transfer regimes Three parameters: on-site Coulomb energy U, bandwidth W and d-band p-band energy difference (charge transfer energy) D U: d i n + d jn d i n-1 + d j n+1 D: d i n d i n+1 + L (L ligand hole) Mott-Hubbard regime Charge transfer regime U < D, gap U W early 3d metals: Ti-O, V-O U > D, gap D W latest 3d metals: Ni-O, Cu-O
17 Mott-Hubbard vs charge transfer regimes
18 Li-ion battery energy diagram Reductant Oxidant stability due to solid-electrolyte interphase thermodynamic stability electrolyte stability window
19 Lattice oxygen oxidation surface O LiCoO 2 SEI formation oxidized O Li 0 CoO 2 Li x CoO 2 XPS O1s L.Daheron et al., Chem.Mater., 20, 583, 2008
20 Lattice oxygen oxidation surface O species peroxogroup О 2 2- lattice О 2- J.-C. Dupin et al., Phys.Chem.Chem.Phys.,2000,2,1319
21 Band structure upon charge/discharge DOS and PDOS for Li x CoO 2 : blue Co, red - O increasing O2p PDOS at the Fermi level, partial oxidation of O 2- S.Laubach et al., Phys.Chem.Chem.Phys.,2009, 11, 3278 increasing Co3d-O2p hybridization
22 Redox potential of the M n+ /M (n+1)+ pairs B.C.Melot, J.-M.Tarascon, Acc. Chem. Res., 2013, 46, 1226
23 Redox potential of the M n+ /M (n+1)+ pairs Adapted from A.Gutierrez, N.A.Benedek, A.Manthiram, Chem. Mater. 2013, 25, 4010
24 Covalency vs ionicity E E F (Li/Li + ) V(M n+ /M (n+1)+ ) < V(M n+ /M (n+1)+ ) M 3d s* M 3d s* s O 2p s O 2p More covalent M-O bond More ionic M-O bond
25 Covalency vs ionicity Li 2 FeSiO 4 polymorphs Pnmb P2 1 /n Pnm2 1 d av (Fe-O) = 2.025Å d av (Fe-O) = 2.035Å d av (Fe-O) = 2.076Å increasing Fe-O bond covalency increasing Fe 2+ /Fe 3+ redox potential ~ 2.9V ~ 3.0V ~ 3.1V
26 Covalency vs ionicity Li 2 FeSiO 4 CN(Fe) = 4 LiFeBO 3 CN(Fe) = 5 LiFePO 4 CN(Fe) = 6 d av (Fe-O) = 2.025Å d av (Fe-O) = 2.092Å d av (Fe-O) = 2.160Å increasing Fe-O bond covalency increasing Fe 2+ /Fe 3+ redox potential ~ 2.9V ~ 3.0V ~ 3.4V
27 Inductive effect LiMPO 4 MO 6 PO 4 Increasing the M n+ /M (n+1)+ redox potential due to inductive effect Tight bonding of O in the PO 4 group M X O Polarization of the M-O bond by X n+ cation
28 Inductive effect LiMO 2 LiMPO 4 Increasing electronegativity of X More covalent M-O bond More ionic M-O bond Tuning the M n+ /M (n+1)+ redox potential through adjusting the M-O-X interactions Tuning the M n+ /M (n+1)+ redox potential through changing electronegativity of X J.B.Goodenough, Y. Kim, Chem. Mater. 2010, 22,
29 Inductive effect M.E.Arroyo-de Dompablo, M.Armand, J.M.Tarascon, U.Amador,, Electrochem. Comm. 8 (2006)
30 Electronic configuration LiFePO Wh/kg LiFe 0.5 Mn 0.5 PO Wh/kg LiMnPO Wh/kg
31 Electronic configuration pairing energy A.Gutierrez, N.A.Benedek, A.Manthiram, Chem. Mater. 2013, 25, 4010
32 Coordination of oxygen 10 cycles, 2.6V-4.0V NaLiFePO 4 F Li 2 FePO 4 F 75 o C difference Fourier maps Karakulina, Khasanova, Drozhzhin, Tsirlin, Hadermann, Antipov, Abakumov, Chem. Mater., 2016, 28, 7578
33 Coordination of oxygen Li 2 FePO 4 F Karakulina, Khasanova, Drozhzhin, Tsirlin, Hadermann, Antipov, Abakumov, Chem. Mater., 2016, 28, 7578
34 Coordination of oxygen LiFePO 4 F Karakulina, Khasanova, Drozhzhin, Tsirlin, Hadermann, Antipov, Abakumov, Chem. Mater., 2016, 28, 7578
35 Coordination of oxygen Coordination of the Na atoms in layered Na 2 FePO 4 F I.V.Tereshchenko, D.А.Aksyonov, O.A. Drozhzhin, I.A. Presniakov, A.V. Sobolev, A.Zhugayevych, K.Stevenson, E.V.Antipov, A.M.Abakumov, JACS, under review, 2017
36 Coordination of oxygen Charge density difference after removing 1Na from Na 2 FePO 4 F barrier 0.41 ev barrier 0.12 ev S.S. Fedotov, A.A.Kabanov, N.A.Kabanova, V.A.Blatov, A. Zhugayevych, A.M. Abakumov, N.R. Khasanova, E.V.Antipov, J. Phys. Chem. C 2017, 121,
37 Planar defects MnO 6 Cubic close packing (O3 structure) Na Layered ordering of the Mn 3+ O 6 and NaO 6 octahedra d(mn-o) eq = 1.930Å x4 d(mn-o) ap = 2.395Å x2 Compare with LiCoO 2 : d(co-o) = 1.921Å x6 Na-ion battery cathode: 0.8 Na can be (de)intercalated reversibly with a capacity of 132 mah/g X. Ma et al, J. Electrochem. Soc. 2011, 158, A1307
38 Jahn-Teller distortion 3d x 2 -y 2(Mn) 3d z 2(Mn) 3d x 2 -y 2 Mn 3+ d 4 t 2g3 e g 1 3d z 2 3d xy 3d xz, yz
39 Planar defects twin plane twin plane a-namno 2 A.Abakumov et al., Chem. Mater. 2014, 26, 3306
40 Planar defects ideal b-namno 2 b-namno 2
41 Planar defects Axial Jahn-Teller distortion of the Mn 3+ O 6 octahedra is necessary to relieve overbonding of oxygen atoms in the twinned structure d(o - Mn): 1.947Å x Å x2 d(o - Mn): 1.930Å x Å x1 BVS(O) = BVS(O) = Isotropic MnO 6 octahedron: BVS(O) = a-namno 2 b-namno 2 Oxygen overbonded
42 Planar defects Redox potential of Na deintercalation (DFT-based estimate): a-namno 2 b-namno V (exper. ~2.5V) 2.63V (exper. 2.7V) suppression of the Jahn-Teller distortion unfavorable O bonding Diffusion constant along and across the twin boundary: D along /D across ~ 10 3 (for twin plane in LiCoO 2 ) impeding 2D Na-ion transport H.Moriwake et al, Adv. Mater. 2013, 25, 618 A.Abakumov et al., Chem. Mater. 2014, 26, 3306
43 Thank you for your attention!
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