A highly stabilized Ni-rich NCA cathode for high-energy lithium-ion batteries

Ryu, Hoon; Park, Nam Yung; Seo, Ji Hoon; Yu, Yi; Sharma, Monika; Mücke, Robert; Kaghazchi, Payam; Yoon, Chong Seung; Sun, Yang Kook

doi:10.1016/j.mattod.2020.01.019

Cited by 190 publications

(118 citation statements)

References 26 publications

Supporting

Mentioning

109

Contrasting

Order By: Relevance

“…A performance comparison of our pouch cell with other Ni-rich NCM cathodes reported previously (including commercial NCM cathodes) is shown in Supplementary Fig. 21 and Table 4 34 – 39 . The 1% LYTP@SC-NCM88 cathode delivers by far the highest reversible capacity while simultaneously offering a high stability when cycled at 0.5 C up to 4.4 V. This excellent result demonstrates the potential practical application of single-crystal cathode materials with ultrahigh Ni content.…”

Section: Resultsmentioning

confidence: 99%

In situ inorganic conductive network formation in high-voltage single-crystal Ni-rich cathodes

et al. 2021

View full text Add to dashboard Cite

High nickel content in LiNixCoyMnzO2 (NCM, x ≥ 0.8, x + y + z = 1) layered cathode material allows high specific energy density in lithium-ion batteries (LIBs). However, Ni-rich NCM cathodes suffer from performance degradation, mechanical and structural instability upon prolonged cell cycling. Although the use of single-crystal Ni-rich NCM can mitigate these drawbacks, the ion-diffusion in large single-crystal particles hamper its rate capability. Herein, we report a strategy to construct an in situ Li1.4Y0.4Ti1.6(PO4)3 (LYTP) ion/electron conductive network which interconnects single-crystal LiNi0.88Co0.09Mn0.03O2 (SC-NCM88) particles. The LYTP network facilitates the lithium-ion transport between SC-NCM88 particles, mitigates mechanical instability and prevents detrimental crystalline phase transformation. When used in combination with a Li metal anode, the LYTP-containing SC-NCM88-based cathode enables a coin cell capacity of 130 mAh g−1 after 500 cycles at 5 C rate in the 2.75-4.4 V range at 25 °C. Tests in Li-ion pouch cell configuration (i.e., graphite used as negative electrode active material) demonstrate capacity retention of 85% after 1000 cycles at 0.5 C in the 2.75-4.4 V range at 25 °C for the LYTP-containing SC-NCM88-based positive electrode.

show abstract

Section: Resultsmentioning

confidence: 99%

In situ inorganic conductive network formation in high-voltage single-crystal Ni-rich cathodes

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Reproduced with permission: copyright 2019, Wiley 78 phase (Fm-3 m) owing to abundant Li + /Ni 2+ site exchange originated from the roughly equal of ionic radius between Li + (0.76 Å) and Ni 2+ (0.69 Å). 7,116,117 Especially, the formation of disordered layered phase at the grain surface by doping high-valence elements is a stable interface layer, which can effectively relieve the structural degradation of the materials, the general doping elements, such as Ti 4+ , [99][100][101]118 Mo 6+ , 102 Sn 4+ , 91,103 BO 3 3À /BO 4 5À , 106 Ta 5+ , 91 W 6+ , 91,107,108 Nb 5+ , 91,109 and so on. For example, Ni-based cathode materials by some elements (Zr 4+ , Mo 6+ , etc.)…”

Section: The Role Of Doping Impactsmentioning

confidence: 99%

Recent advance in structure regulation of high‐capacity Ni‐rich layered oxide cathodes

Qiu

Zhang

Song

et al. 2021

EcoMat

View full text Add to dashboard Cite

High-capacity layered oxide Ni-rich cathodes are attractive to enhance the driving-range of electric vehicles because of its preferential costs. Nevertheless, in Ni-rich cathodes, there are still many issues such as microcracks generation along grain boundaries and interface side reaction between active substance and electrolyte, resulting in the rapidly deterioration of electrochemical property. Herein, improving the performance of Ni-based cathodes by structural regulation is summarized. The remaining challenges and outlook are discussed as well.

show abstract

“…In this regard, the conventional stabilisation strategy of doping the crystal structure fails to adequately address the problematic origins of the degradation mechanism as these dopants do not alter the random orientation of the equiaxed grains; 19 – 22 they merely delay the onset of decay. However, recent studies on B-, W-, Ta-, and Sb-doped cathodes have offered promising countermeasures against degradation 23 – 26 . By reshaping the primary particles of the cathode into radially aligned rod- or needle-like grains, the strain during cycling can be homogeneously distributed within the cathode particle to inhibit intergranular cracking and subsequent electrolyte penetration.…”

Section: Introductionmentioning

confidence: 99%

Transition metal-doped Ni-rich layered cathode materials for durable Li-ion batteries

et al. 2021

Self Cite

View full text Add to dashboard Cite

Doping is a well-known strategy to enhance the electrochemical energy storage performance of layered cathode materials. Many studies on various dopants have been reported; however, a general relationship between the dopants and their effect on the stability of the positive electrode upon prolonged cell cycling has yet to be established. Here, we explore the impact of the oxidation states of various dopants (i.e., Mg2+, Al3+, Ti4+, Ta5+, and Mo6+) on the electrochemical, morphological, and structural properties of a Ni-rich cathode material (i.e., Li[Ni0.91Co0.09]O2). Galvanostatic cycling measurements in pouch-type Li-ion full cells show that cathodes featuring dopants with high oxidation states significantly outperform their undoped counterparts and the dopants with low oxidation states. In particular, Li-ion pouch cells with Ta5+- and Mo6+-doped Li[Ni0.91Co0.09]O2 cathodes retain about 81.5% of their initial specific capacity after 3000 cycles at 200 mA g−1. Furthermore, physicochemical measurements and analyses suggest substantial differences in the grain geometries and crystal lattice structures of the various cathode materials, which contribute to their widely different battery performances and correlate with the oxidation states of their dopants.

show abstract

A highly stabilized Ni-rich NCA cathode for high-energy lithium-ion batteries

Cited by 190 publications

References 26 publications

In situ inorganic conductive network formation in high-voltage single-crystal Ni-rich cathodes

In situ inorganic conductive network formation in high-voltage single-crystal Ni-rich cathodes

Recent advance in structure regulation of high‐capacity Ni‐rich layered oxide cathodes

Transition metal-doped Ni-rich layered cathode materials for durable Li-ion batteries

Contact Info

Product

Resources

About