In situ inorganic conductive network enables superior high-voltage operation of single-crystal Ni-rich cathode
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"_oai": {
"id": "oai:materialscloud.org:936"
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"keywords": [
"single-crystal Ni-rich NCM",
"In situ",
"conductive network",
"lithium-ion transport",
"crystalline phase transformation",
"Experimental"
],
"is_last": true,
"publication_date": "Jul 21, 2021, 12:03:30",
"owner": 458,
"license_addendum": null,
"contributors": [
{
"givennames": "Xinming",
"familyname": "Fan",
"affiliations": [
"School of Metallurgy and Environment, Central South University, Changsha 410083, P.R. China"
]
},
{
"givennames": "Xing",
"email": "ouxing@csu.edu.cn",
"familyname": "Ou",
"affiliations": [
"School of Metallurgy and Environment, Central South University, Changsha 410083, P.R. China"
]
},
{
"givennames": "Wengao",
"email": "wengao.zhao@empa.ch",
"familyname": "Zhao",
"affiliations": [
"Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Du\u0308bendorf, Switzerland",
"School of Energy Research, Xiamen University, Xiamen, Fujian 361005, P.R. China"
]
},
{
"givennames": "Yun",
"familyname": "Liu",
"affiliations": [
"School of Metallurgy and Environment, Central South University, Changsha 410083, P.R. China"
]
},
{
"givennames": "Bao",
"familyname": "Zhang",
"affiliations": [
"School of Metallurgy and Environment, Central South University, Changsha 410083, P.R. China"
]
},
{
"givennames": "Jiafeng",
"familyname": "Zhang",
"affiliations": [
"School of Metallurgy and Environment, Central South University, Changsha 410083, P.R. China"
]
},
{
"givennames": "Lianfeng",
"familyname": "Zou",
"affiliations": [
"Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States"
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{
"givennames": "Lukas",
"familyname": "Seidl",
"affiliations": [
"Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Du\u0308bendorf, Switzerland"
]
},
{
"givennames": "Yangzhong",
"familyname": "Li",
"affiliations": [
"High Performance Computing Department, National Supercomputing Center in Shenzhen, Shenzhen, Guangdong 518055, China"
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},
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"givennames": "Guorong",
"familyname": "Hu",
"affiliations": [
"School of Metallurgy and Environment, Central South University, Changsha 410083, P.R. China"
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{
"givennames": "Corsin",
"familyname": "Battaglia",
"affiliations": [
"Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Du\u0308bendorf, Switzerland"
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{
"givennames": "Yong",
"email": "yyang@xmu.edu.cn",
"familyname": "Yang",
"affiliations": [
"School of Energy Research, Xiamen University, Xiamen, Fujian 361005, P.R. China"
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}
],
"description": "High nickel content in LiNixCoyMnzO2 (NCM, x \u2265 0.8, x + y + z = 1) layered cathode material allows high energy density in lithium-ion batteries (LIBs). However, Ni-rich NCM cathodes suffer from performance degradation, mechanical and structural instability upon prolonged cell cycling. Although the use of single-crystal Ni-rich NCM can mitigate these drawbacks, the ion-diffusion in large single-crystal particles hamper its rate capability. Herein, we report a strategy to construct an in situ Li1.4Y0.4Ti1.6(PO4)3 (LYTP) ion/electron conductive network which interconnects single-crystal LiNi0.88Co0.09Mn0.03O2 (SC-NCM88) particles. The LYTP network facilitates the lithium-ion transport between SC-NCM88 particles, mitigates mechanical instability and prevents detrimental crystalline phase transformation. When used in combination with a Li metal anode, the LYTP-containing SC-NCM88-based cathode enables a coin cell capacity of 130 mAh g-1 after 500 cycles at 5 C rate in the 2.75-4.4 V range at 25 \u00b0C. Tests in Li-ion pouch cell configuration (i.e., graphite used as negative electrode active material) demonstrate capacity retention of 85% after 1000 cycles at 0.5 C in the 2.75-4.4 V range at 25 \u00b0C for the LYTP-containing SC-NCM88-based positive electrode.",
"title": "In situ inorganic conductive network enables superior high-voltage operation of single-crystal Ni-rich cathode",
"edited_by": 100,
"license": "Creative Commons Attribution 4.0 International",
"id": "936",
"_files": [
{
"key": "Figure 1.png",
"description": "Figure 1. LYTP@SC-NCM88 preparation process. Schematic illustration of the synthesis method for LYTP modified SC-NCM88 cathode.",
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"description": "Figure 2. Representative morphology images of LYTP@SC-NCM88. (a) Overall and (b) cross-sectional morphologies derived from SEM images. (c) Cross-section EPMA image of 1% LYTP@SC-NCM88 with the corresponding selected area LYTP mapping results of Ni, Co, Mn, Ti, and P elements. (d) TEM, (e) HRTEM, and (f) STEM elemental mappings of Ni, Co, Mn, Y, and Ti for 1% LYTP@SC-NCM88.",
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"description": "Figure 3. Raw data of conductivity and structure characterization of LYTP@SC-NCM88. The comparison of (a) electron conductivity and (b) Li-ion conductivity between pristine SC-NCM88 and 1% LYTP@SC-NCM88. (c) The XRD Rietveld refinement of 1% LYTP@SC-NCM88.",
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"key": "Figure 4.xlsx",
"description": "Figure 4. Raw data of electrochemical performance for coin-type half cells. Cycling stability of pristine SC-NCM88 and 1% LYTP@SC-NCM88 against a lithium metal anode at 0.5 C under testing temperature of (a) 25 oC and (b) 55 oC. Charge/discharge curves for (c) SC-NCM88 and (d) 1% LYTP@SC-NCM88 from 1st to 100th cycle at 55 oC. (e) Cycling capability at various current densities and (f) long-term cycling stability at 5C for SC-NCM88 and 1% LYTP@SC-NCM88. All cells were cycled in 2.75-4.4V.",
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"description": "Figure 5. Raw data of electrochemical evaluation for pouch-type full cells. (a) Cycling performances and (b, c) corresponding dQ/dV curves of the pristine SC-NCM88 and the 1% LYTP@SC-NCM88 against a graphite anode from the 1st cycle to the 1000th cycle. (d) Cycling performance and (e) energy density for the pristine SC-NCM88 and the 1% LYTP@SC-NCM88 at an elevated temperature of 45 oC. All cells were cycled in the voltage range of 2.75-4.4 V.",
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"key": "Figure 6.xlsx",
"description": "Figure 6. Raw data of phase transitions Investigation during cycling. Operando XRD characterization of the full contour plots and selected line patterns for (a, c) SC-NCM88 and (b, d) 1% LYTP@SC-NCM88 cathodes during the initial cycle in the voltage range of 2.75-4.6 V. (e) The variation of the c-axis parameter during charging for pristine SC-NCM88 and 1% LYTP@SC-NCM88.",
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"key": "Figure 7.xlsx",
"description": "Figure 7. Density functional theory calculation. Raw data of the total and partial density of states plots for (a) pristine SC-NCM88 and (b) 1% LYTP@SC-NCM88.",
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"key": "Figure 8.xlsx",
"description": "Figure 8. Raw data of surface chemistry compositions of cycled cathodes. TOF-SIMS depth profiles of the near-surface chemical composition for (a) C2HO-, (b) POF2-, (c) C2F-, (d) PO3-, (e) NiF3-, (f) CoF3-, (g) MnF3- and (h) 6LiF2-. XPS spectra of (i) C 1s, (j) O 1s, (k) F 1s and (l) P 2p elements for the pristine SC-NCM88 and 1% LYTP@SC-NCM88 cathodes after 200 cycles from 2.7V to 4.4 V.",
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"description": "Figure 9. Intraparticle structural evolution after long-term cycling. Post-mortem HRTEM and magnified HRTEM at selected area images for (a, a1, a2) pristine SC-NCM88 and (b, b1, b2) 1% LYTP@SC-NCM88 after 200 cycles. Cross-sectional SEM images of (c) pristine SC-NCM88 and (g) 1% LYTP@SC-NCM88. Low-magnification HAADF-STEM image of FIB-cross section for the surface region and magnified HAADF-STEM images taken from the corresponding surface areas for (d-f) pristine SC-NCM88 and (h-j) 1%LYTP@SC-NCM",
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