Transmission electron microscopy studies of structural degradation behavior of LiNi0.6Co0.2Mn0.2O2 cathode materials

Yun, Han-Sol; Lee, Sanghyuk; Cho, Nam-Hee; Lee, Dae‐Jin; Jeon, Hye-Lim; Park, Sin-Young; Jeong, Wang-Mo

doi:10.1007/s10853-017-1080-z

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References 27 publications

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“…XPS and HR-TEM are the two most used surface characterization methods. − In the C 1s peaks (Figure a,b), the peak at ∼285 eV is assigned to the C–C bond of Super P, while two other peaks of C–H and C–F are related to the PVDF binder. The C 1s peaks at ∼287.5 and ∼289 eV (Figure a,b) and the O 1s peaks at ∼534 and ∼532 eV (Figure c,d) may be due to ethers and carbonates, respectively, caused by the electrolyte decomposition.…”

Section: Resultsmentioning

confidence: 99%

Ultrathin Li–Si–O Coating Layer to Stabilize the Surface Structure and Prolong the Cycling Life of Single-Crystal LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Materials at 4.5 V

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Wen

et al. 2021

ACS Appl. Mater. Interfaces

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Single-crystal LiNi1–x–y Co x Mn y O2 cathode materials can effectively suppress intergranular cracks that usually is seen in commercial polycrystal LiNi1–x–y Co x Mn y O2 cathode materials. However, the surface structure degradation for single-crystal LiNi1–x–y Co x Mn y O2 cathode materials is still aggravated at a higher cutoff voltage (over 4.5 V). In this work, we prepare single-crystal LiNi0.6Co0.2Mn0.2O2 cathode materials via a solid-state method and then coat an ultrathin Li–Si–O layer on their surface by a wet coating method. The results show that the single-crystal LiNi0.6Co0.2Mn0.2O2 cathode materials with a Li–Si–O coating layer deliver excellent cycling performance even at a higher cutoff voltage of 4.5 V. The optimized Li–Si–O-modified sample displays a capacity retention of 90.6% after 100 cycles, whereas only 68.0% for unmodified single-crystal LiNi0.6Co0.2Mn0.2O2. Further analysis of the cycled electrodes reveals that the surface structure degradation is the main reason for the decrease of electrochemical performance of single-crystal LiNi0.6Co0.2Mn0.2O2 at a high voltage (4.5 V). In contrast, with Li–Si–O coating, this phenomenon can be suppressed effectively to maintain interfacial stability and prolong the cycling life.

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Section: Resultsmentioning

confidence: 99%

Ultrathin Li–Si–O Coating Layer to Stabilize the Surface Structure and Prolong the Cycling Life of Single-Crystal LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Materials at 4.5 V

You

Wen

et al. 2021

ACS Appl. Mater. Interfaces

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Transmission electron microscopy studies of structural degradation behavior of LiNi0.6Co0.2Mn0.2O2 cathode materials

Cited by 1 publication

References 27 publications

Ultrathin Li–Si–O Coating Layer to Stabilize the Surface Structure and Prolong the Cycling Life of Single-Crystal LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Materials at 4.5 V

Ultrathin Li–Si–O Coating Layer to Stabilize the Surface Structure and Prolong the Cycling Life of Single-Crystal LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Materials at 4.5 V

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Transmission electron microscopy studies of structural degradation behavior of LiNi0.6Co0.2Mn0.2O2 cathode materials

Cited by 1 publication

References 27 publications

Ultrathin Li–Si–O Coating Layer to Stabilize the Surface Structure and Prolong the Cycling Life of Single-Crystal LiNi0.6Co0.2Mn0.2O2 Cathode Materials at 4.5 V

Ultrathin Li–Si–O Coating Layer to Stabilize the Surface Structure and Prolong the Cycling Life of Single-Crystal LiNi0.6Co0.2Mn0.2O2 Cathode Materials at 4.5 V

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Ultrathin Li–Si–O Coating Layer to Stabilize the Surface Structure and Prolong the Cycling Life of Single-Crystal LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Materials at 4.5 V

Ultrathin Li–Si–O Coating Layer to Stabilize the Surface Structure and Prolong the Cycling Life of Single-Crystal LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Materials at 4.5 V