Surface Modification Engineering Enabling 4.6 V Single-Crystalline Ni-Rich Cathode with Superior Long-Term Cyclability

Fan Xin-Ming; Huang Ying-De; Wei Han-XinTang Lin-BoHe Zhen-JiangYan ChengMao JingDai Ke-HuaZheng Jun-Chao

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Surface Modification Engineering Enabling 4.6 V Single-Crystalline Ni-Rich Cathode with Superior Long-Term Cyclability

机译：Surface Modification Engineering Enabling 4.6 V Single-Crystalline Ni-Rich Cathode with Superior Long-Term Cyclability

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Aiming for increased nickel and lower cobalt content in layered transition metal oxide cathodes (NCM) is a feasible strategy for achieving increased energy density and cost competitiveness in commercial lithium-ion batteries. However, the practical long-term cycling of NCM cathodes suffers from severe capacity degradation due to irreversible interface phase transformation and unavoidable crack formation. Herein, an in situ modification strategy is used to form a uniform and conformal Li1.8Sc0.8Ti1.2(PO4)(3) (LSTP) protective layer by interconnecting the single-crystal-layered LiNi0.6Co0.1Mn0.3O2 (SC-NCM) particles. LSTP surface modification helps to construct a robust cathode-electrolyte interphase thin film between the cathode and the electrolyte, which can prevent SC-NCM corrosion by electrolyte, and the stability of the mechanics can improve the intergranular cracks caused by long cycles under harsh conditions. Moreover, the LSTP conductive modification layer facilitates the lithium-ion transport among cathode particles, effectively enhancing the rate capability. Impressively, the LSTP modified SC-NCM exhibits a high reversible capacity of 144.3 mAh g(-1) at the high discharge rate of 5 C and maintains a capacity retention of 90.27% even at the ultrahigh charge voltage of 4.6 V operation after 500 cycles. Moreover, in a pouch-type full battery, the graphite/LSTP modified SC-NCM maintains a capacity retention of 89.6% after 1700 cycles.

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来源
《Advanced functional materials》 |2022年第6期|2109421.1-2109421.11|共11页
作者
Fan Xin-Ming; Huang Ying-De; Wei Han-XinTang Lin-BoHe Zhen-JiangYan ChengMao JingDai Ke-HuaZheng Jun-Chao;
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Cent South Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China|Cent South Univ, Natl Engn Lab High Efficiency Recovery Refractory, Changsha 410083, Peoples R China|Cent South Univ, Engn Res Ctr, Minist Educ Adv Battery Mat, Changsha 410083,;

Queensland Univ Technol, Sch Mech Med & Proc Engn, Brisbane, Qld 4001, Australia;

Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R ChinaTianjin Normal Univ, Coll Chem, Tianjin 300387, Peoples R China;

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high-voltage operation; lithium-ion battery; single-crystalline Ni-rich; Co-poor cathode; superior capacity retention;

Surface Modification Engineering Enabling 4.6 V Single-Crystalline Ni-Rich Cathode with Superior Long-Term Cyclability

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