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Orientation-Dependent Lithium Miscibility Gap in LiFePO4
Li, ZJ; Yang, JX; Li, CJ; Wang, SC; Zhang, L; Zhu, KJ; Wang, XH; Wang, XH (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
2018-02-13
发表期刊CHEMISTRY OF MATERIALS
ISSN0897-4756
卷号30期号:3页码:874-878
摘要[100](Pnma) is believed to be a tough diffusion direction for Li+ in LiFePO4, leading to the belief that the rate performance of [100]-oriented LiFePO4 is poor. Recent work revealed that reducing the dimension of the LiFePO4 phase to 12 nm in the [100] direction increased the extent of Li solid solution between LiFePO4 and FePO4, which produced an increase in the active population and excellent rate performance, but the lithiation/delithiation mechanism for this interesting phenomenon remains to be unraveled. Here we report, by using operando X-ray diffraction, the phase transition path involved in the lithiation/delithiation process is single-phase featured. This work presents one of the first experimental demonstrations that decreasing the dimension of LiFePO4 in the [100] direction to the LiFePO4/FePO4 equilibrium phase boundary width can improve the solid solubility of both the end solid solutions (Li alpha FePO4 and Li1-beta FePO4) and decrease the miscibility gap of LiFePO4, demonstrating a highly orientation-dependent lithium miscibility gap.; [100](Pnma) is believed to be a tough diffusion direction for Li+ in LiFePO4, leading to the belief that the rate performance of [100]-oriented LiFePO4 is poor. Recent work revealed that reducing the dimension of the LiFePO4 phase to 12 nm in the [100] direction increased the extent of Li solid solution between LiFePO4 and FePO4, which produced an increase in the active population and excellent rate performance, but the lithiation/delithiation mechanism for this interesting phenomenon remains to be unraveled. Here we report, by using operando X-ray diffraction, the phase transition path involved in the lithiation/delithiation process is single-phase featured. This work presents one of the first experimental demonstrations that decreasing the dimension of LiFePO4 in the [100] direction to the LiFePO4/FePO4 equilibrium phase boundary width can improve the solid solubility of both the end solid solutions (Li alpha FePO4 and Li1-beta FePO4) and decrease the miscibility gap of LiFePO4, demonstrating a highly orientation-dependent lithium miscibility gap.
部门归属[li, zhaojin ; yang, jinxing ; li, changji ; wang, sucheng ; zhang, lei ; wang, xiaohui] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, liaoning, peoples r china ; [li, zhaojin] univ chinese acad sci, beijing 100039, peoples r china ; [yang, jinxing] univ sci & technol china, sch mat sci & engn, shenyang 110016, liaoning, peoples r china ; [zhu, kongjun] nanjing univ aeronaut & astronaut, state key lab mech & control mech struct, nanjing 210016, jiangsu, peoples r china
关键词Phase-transition Room-temperature Li-insertion/extraction Coherency Strain Solid-solution Lixfepo4 Fepo4 Nanoparticles Electrodes Kinetics
学科领域Chemistry, Physical ; Materials Science, Multidisciplinary
资助者Youth Innovation Promotion Association; Chinese Academy of Sciences (CAS) [2011152]; Shenyang National Laboratory for Materials Science, Institute of Metal Research, CAS; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund [U1501501]
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/79504
专题中国科学院金属研究所
通讯作者Wang, XH (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式
GB/T 7714
Li, ZJ,Yang, JX,Li, CJ,et al. Orientation-Dependent Lithium Miscibility Gap in LiFePO4[J]. CHEMISTRY OF MATERIALS,2018,30(3):874-878.
APA Li, ZJ.,Yang, JX.,Li, CJ.,Wang, SC.,Zhang, L.,...&Wang, XH .(2018).Orientation-Dependent Lithium Miscibility Gap in LiFePO4.CHEMISTRY OF MATERIALS,30(3),874-878.
MLA Li, ZJ,et al."Orientation-Dependent Lithium Miscibility Gap in LiFePO4".CHEMISTRY OF MATERIALS 30.3(2018):874-878.
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