首页|Overcoming the Na-ion conductivity bottleneck for the cost-competitive chloride solid electrolytes

Overcoming the Na-ion conductivity bottleneck for the cost-competitive chloride solid electrolytes

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Chloride solid electrolytes possess multiple advantages for the construction of safe,energy-dense all-solid-state sodium batteries,but presently the chlorides with sufficiently high cost-competitiveness for commercialization almost all exhibit low Na-ion conductivities of around 10-5 S cm-1 or lower.Here,we report a chloride solid electrolyte,Na2.7ZrCl5.3O0.7,which reaches a Na-ion conductivity of 2.29 × 10-4 S cm-1 at 25 ℃ without involving overly expensive raw materials such as rare-earth chlo-rides or Na2S.In addition to the efficient ion transport,Na2.7ZrCl5.3O0.7 also shows an excellent deforma-bility surpassing that of the widely studied Na3PS4,Na3SbS4,and Na2ZrCl6 solid electrolytes.The combination of these advantages allows the all-solid-state cell based on Na2.7ZrCl5.3O0.7 and NaCrO2 to realize stable room-temperature cycling at a much higher specific current than those based on other non-viscoelastic chloride solid electrolytes in literature(120 mA g-1 vs.12-55 mA g-1);after 100 cycles at such a high rate,the Na2.7ZrCl5.3O0.7-based cell can still deliver a discharge capacity of 80 mAh g-1 at 25 ℃.

All-solid-state sodium batteriesIonic conductivitiesSolid electrolytesChloridesHigh voltage stability

Lv Hu、Hui Li、Fang Chen、Yating Liu、Jinzhu Wang、Cheng Ma

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Hefei National Research Center for Physical Sciences at the Microscale,CAS Key Laboratory of Materials for Energy Conversion,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,Anhui,China

National Synchrotron Radiation Laboratory,Hefei 230026,Anhui,China

Strategic Priority Research Program of the Chinese Academy of SciencesNational Key R&D Program of ChinaUSTC Research Funds of the Double First-Class InitiativeFundamental Research Funds for the Central UniversitiesNational Synchrotron Radiation Laboratory

XDB04502012018YFA0209600YD2060002033WK2060000060KY2060000199

2024

10.1016/j.jechem.2024.03.023

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.95(8)