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Superior electrochemical performance of quasi-concentration-gradient LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode material synthesized with multi-shell precursor and new aluminum source

Journal Article


Abstract


  • Ni-rich LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) is considered as one of the most attractive cathode materials for Li-ion batteries. However, poor thermal stability and cycle performance for this material have to be faced. In this work, to promote the cycle and thermal stability of NCA cathode without lessening its discharge capacity, for the first time, quasi-concentration-gradient NCA cathode (QCG-NCA) is designed and synthesized with multi-shell precursor. The electrochemical properties and thermal stability of QCG-NCA are compared to homogeneous LiNi 0.8 Co 0.15 Al 0.05 O 2 (HG-NCA), core material LiNi 0.85 Co 0.15 O 2 (HG-NC) and the outer shell material LiNi 0.6 Co 0.15 Al 0.25 O 2 (HG-NCA25). As expected, QCG-NCA exhibits higher discharge capacity (198.1 mA h g ���1 at 20 mA g ���1 ), higher capacity retention (87.8% at 0.2C after 200 cycles; 70.9% at 1C after 500 cycles) and better thermal stability than the homogeneous one. Reasons of these enhancements are investigated in this work. This strategy extends the concept of concentration-gradient structure and offers a new strategy suitable for practical application to modify the NCA cathode material.

Publication Date


  • 2019

Citation


  • Liang, M., Sun, Y., Song, D., Shi, X., Han, Y., Zhang, H., & Zhang, L. (2019). Superior electrochemical performance of quasi-concentration-gradient LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode material synthesized with multi-shell precursor and new aluminum source. Electrochimica Acta, 300, 426-436. doi:10.1016/j.electacta.2019.01.125

Scopus Eid


  • 2-s2.0-85060946848

Web Of Science Accession Number


Start Page


  • 426

End Page


  • 436

Volume


  • 300

Issue


Place Of Publication


Abstract


  • Ni-rich LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) is considered as one of the most attractive cathode materials for Li-ion batteries. However, poor thermal stability and cycle performance for this material have to be faced. In this work, to promote the cycle and thermal stability of NCA cathode without lessening its discharge capacity, for the first time, quasi-concentration-gradient NCA cathode (QCG-NCA) is designed and synthesized with multi-shell precursor. The electrochemical properties and thermal stability of QCG-NCA are compared to homogeneous LiNi 0.8 Co 0.15 Al 0.05 O 2 (HG-NCA), core material LiNi 0.85 Co 0.15 O 2 (HG-NC) and the outer shell material LiNi 0.6 Co 0.15 Al 0.25 O 2 (HG-NCA25). As expected, QCG-NCA exhibits higher discharge capacity (198.1 mA h g ���1 at 20 mA g ���1 ), higher capacity retention (87.8% at 0.2C after 200 cycles; 70.9% at 1C after 500 cycles) and better thermal stability than the homogeneous one. Reasons of these enhancements are investigated in this work. This strategy extends the concept of concentration-gradient structure and offers a new strategy suitable for practical application to modify the NCA cathode material.

Publication Date


  • 2019

Citation


  • Liang, M., Sun, Y., Song, D., Shi, X., Han, Y., Zhang, H., & Zhang, L. (2019). Superior electrochemical performance of quasi-concentration-gradient LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode material synthesized with multi-shell precursor and new aluminum source. Electrochimica Acta, 300, 426-436. doi:10.1016/j.electacta.2019.01.125

Scopus Eid


  • 2-s2.0-85060946848

Web Of Science Accession Number


Start Page


  • 426

End Page


  • 436

Volume


  • 300

Issue


Place Of Publication