Abstract
With the scarcity of cobalt resources and soaring prices, the removal of cobalt from nickel-rich layered cathodes is now a priority to reduce the material costs and develop the sustainability of lithium-ion batteries (LIBs). In this work, we report a single-crystal cobalt-free LiNi0.6Mn0.4O2 (NM64) layered oxide cathode and compare it with single-crystal LiNi0.6Co0.1Mn0.3O2 (NCM613) cathode. On the one hand, NM64 exhibits competitive energy density to NCM613 and better long-term cycle stability under a high cutoff voltage of 4.5 V. Impressively, single-crystal NM64 not only could effectively suppress the microcrack formation, resulting in the excellent structural stability and long cycling lifespan even at the full delithiated state, but also, it has superior thermal stability to single-crystal NCM613, which is beneficial to achieve high operational safety of LIBs. On the other hand, due to the removal of expensive cobalt, the material cost of NM64 is only 2/3 of NCM613, which is conducive to significantly reducing the cost of LIBs. As a result, NM64 exhibits high energy density (765.27 Wh kg−1) and remarkable cycle stability (93.21 mA h g−1 after 200 cycles at a high charging voltage of 4.5 V). Considering the cost and electrochemical performance advantages, the NM64 cathode is highly expected to stand out in the next generation of cobalt-free LIBs.
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Funding
This work is financially supported by the National Natural Science Foundation of China (22279116, U20A20253, 52073252 and 21972127), the Zhejiang Provincial Natural Science Foundation of China (LY21E020005, LD22E020006, 2022C01173, 2023C01231, LR20E020001 and LR20E020002), the China Postdoctoral Science Foundation (2020M671785 and 2020T130597), and the Scientific Research Project of Shaoxing City (2022003015).
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Yang Xia: conceptualization, funding acquisition and writing—original draft. Lexin Zhou: methodology, investigation, data curation and writing—original draft. Kun Wang: investigation and writing—original draft. Chengwei Lu: investigation and writing—original draft. Zhen Xiao: investigation, funding acquisition and writing—review and editing. Qinzhong Mao: methodology, data curation and funding acquisition. Xiaoxiao Lu: investigation and writing—original draft. Jun Zhang: investigation and visualization. Hui Huang: investigation and formal analysis. Yongping Gan: formal analysis and visualization. Xinping He: methodology and data curation. Wenkui Zhang: funding acquisition, writing—review and editing. Xinhui Xia: supervision, funding acquisition, writing—review and editing.
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Xia, Y., Zhou, L., Wang, K. et al. Economical cobalt-free single-crystal LiNi0.6Mn0.4O2 cathodes for high-performance lithium-ion batteries. J Solid State Electrochem 27, 1363–1372 (2023). https://doi.org/10.1007/s10008-023-05396-y
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DOI: https://doi.org/10.1007/s10008-023-05396-y