Rate capability for Na-doped Li1.167Ni0.18Mn0.548Co0.105O2 cathode material and characterization of Li-ion diffusion using galvanostatic intermittent titration technique

Lim, Sung Nam; Seo, Jungyun; Jung, Dae Soo; Ahn, Wook; Song, Hanjung; Yeon, Sun-Hwa; Park, Seung Bin

doi:10.1016/j.jallcom.2014.09.203

Cited by 50 publications

(19 citation statements)

References 38 publications

(44 reference statements)

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“…However, a high degree of structure defects, accompanied with highly disordering of Li + in the transition metal layer, would deteriorate the structural stability, leading to the poor cycling stability and the rate capacity. Na + doping has been reported to be an effective avenue to facilitate the Li + diffusion of Li‐rich layered materials and thus to improve their rate capacity . Note that it is vital to control the doping amount of Na + .…”

Section: Refined Crystal Parameters Of Plr and Slr Targeted Space Grmentioning

confidence: 99%

“…The XRD patterns of the PLR and SLR material could be indexed to the R‐3m space group of the layered α‐NaFeO 2 structure and C‐2m space group of Li 2 MnO 3 (Figure d) . After doping, the (003) and (104) peaks of SLR, shown in Figure e,f, are shifted to lower angle, which means enlargement in Li + slab . To gain the quantitative data of the lattice parameter, Rietveld refinement of the XRD data was conducted and shown in Figure S4 (Supporting Information).…”

Section: Refined Crystal Parameters Of Plr and Slr Targeted Space Grmentioning

confidence: 99%

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Enhancing the Kinetics of Li‐Rich Cathode Materials through the Pinning Effects of Gradient Surface Na⁺ Doping

Qing

Shi

Xiao

et al. 2015

Advanced Energy Materials

324

201

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facilitate the electrochemical activity of Li 2 MnO 3 . [22][23][24] Conventional approaches in activating Li 2 MnO 3 component in Lirich layered materials are mainly through chemical etching of Li 2 O in Li 2 MnO 3 phases to generate structural defects, such as nitric acid or hydrazine hydrate modifi cation. [ 6,20,25 ] Although Li 2 MnO 3 could be activated, which improved the initial Coulombic effi ciency, the original surface morphology is prone to being destroyed during the etching process ( Figure S1a, Supporting Information), hence leading to the poor cycling stability ( Figure S1b, Supporting Information) and rate performance during subsequent cycles. Li-rich layered materials modifi ed by hydrazine hydrate was reported to have long-term energy retention. [ 20 ] However, the unfavorable platform below 3.0 V appears in the discharge process, which compromises the energy density, especially for the Mn-rich based Li-rich cathode materials ( Figure S2, Supporting Information).Xia and co-workers reported to improve their electrochemical performances through controlled structure defects in Li 2 MnO 3 phase of Li-rich materials. [ 26 ] However, a high degree of structure defects, accompanied with highly disordering of Li + in the transition metal layer, would deteriorate the structural stability, leading to the poor cycling stability and the rate capacity. Na + doping has been reported to be an effective avenue to facilitate the Li + diffusion of Li-rich layered materials and thus to improve their rate capacity. [27][28][29][30] Note that it is vital to control the doping amount of Na + . Li-rich layered materials doped with a low amount of Na + would exhibit the poor cycling stability whereas the material doped with a high amount of Na + shows decreased specifi c capacity and deteriorates the energy density. [ 28 ] Therefore, it is still challenging to develop one simple and effective approach to synthesize Li-rich layered material with much improved kinetics.Herein, we propose a novel method to enhance the kinetics of large particle Li-rich layered materials by gradient surface Na + doping. Driven by Na + concentration diffusion thermodynamically, gradient surface Na + doping are realized through the calcination process of Li-rich materials in molten NaCl state. Powder X-ray diffraction (XRD) shows that high degree of structure defects are formed in Li 2 MnO 3 phase of Li-rich material in molten NaCl fl ux. [ 26 ] Gradient Na + doping on the surface of large particle Li-rich layered material could not only realize the pinning effect in stabilizing the Li-rich layered structure with large amount of structural defects but also facilitate the diffusion of Li + in the layered structure. Accordingly, the resultant large particle Li-rich layered material represents superior electrochemical performances, particularly high specifi c capacity, excellent Coulombic effi ciency, and impressive cycling stability. The schematic illustration of the structural design is shown in Figure 1 .

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Section: Refined Crystal Parameters Of Plr and Slr Targeted Space Grmentioning

confidence: 99%

Section: Refined Crystal Parameters Of Plr and Slr Targeted Space Grmentioning

confidence: 99%

Enhancing the Kinetics of Li‐Rich Cathode Materials through the Pinning Effects of Gradient Surface Na⁺ Doping

Qing

Shi

Xiao

et al. 2015

Advanced Energy Materials

324

201

View full text Add to dashboard Cite

show abstract

“…LL synthesized under solvothermal condition proposed by Sun and co‐workers also exhibits much higher specific capacity and capacity retention than ones obtained through conventional coprecipitation (Figure c) . Na + doping also shows positive effects on boosting rate capability of LL by widening its 2D Li + diffusion planes (Figure d), which has a similar mechanism to elemental dopants with larger ionic radius …”

Section: Libsmentioning

confidence: 85%

“…Third, rational modifications on crystal structure, such as heteroatom doping, have also been proven feasible. Taking Na doping as an example, Na + dopants can be used to expand crystal structure and widen the Li + diffusion channels due to larger ionic radius, which improves rate capability of Na + doped cathodes . Last but not least, tuning crystal habit to increase the percentage of exposed (010) facets in R

\overset{3}{true}

m LiMO 2 has also been investigated to promote Li + diffusion …”

Section: Libsmentioning

confidence: 99%

Layer‐Based Heterostructured Cathodes for Lithium‐Ion and Sodium‐Ion Batteries

Deng

Liang

et al. 2019

Adv Funct Materials

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A critical bottleneck that hinders major performance improvement in lithium-ion and sodium-ion batteries is the inferior electrochemical activity of their cathode materials. While significant research progresses have been made, conventional single-phase cathodes are still limited by intrinsic deficiencies such as low reversible capacity, enormous initial capacity loss, rapid capacity decay, and poor rate capability. In the past decade, layer-based heterostructured cathodes acquired by combining multiple crystalline phases have emerged as candidates with a huge potential to realize performance breakthrough. Herein, recent studies on the structural properties, electrochemical behaviors, and synthesis route optimizations of these heterostructured cathodes are summarized for in-depth discussions. Particular attention is paid to the latest mechanism discoveries and performance achievements. This review thus aims to promote a deeper understanding of the correlation between the crystal structure of cathodes and their electrochemical behavior, and offers guidance to design advance cathode materials from the aspect of crystal structure engineering.

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“…As the world population continues to grow, we could not fulfill the energy consumption requirement without developing a clean energy system (Majeau-Bettez et al, 2011; Catenacci et al, 2013). To address this, many research groups have recently been contributing to the development of electrochemical energy conversion and storage devices such as hybrid capacitors, metal–air batteries, and high-power lithium ion batteries (Lim et al, 2015; Ahn et al, 2016a,b, 2018; Seo et al, 2018). Among them, technology advancement in high-power lithium ion batteries that can be applied to electric vehicles (EVs) has been investigated (Lin et al, 2017; Cano et al, 2018; Fu et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

High Lithium Ion Transport Through rGO-Wrapped LiNi0.6Co0.2Mn0.2O2 Cathode Material for High-Rate Capable Lithium Ion Batteries

et al. 2019

Self Cite

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In this work, we show an effective ultrasonication-assisted self-assembly method under surfactant solution for a high-rate capable rGO-wrapped LiNi 0.6 Co 0.2 Mn 0.2 O 2 (Ni-rich cathode material) composite. Ultrasonication indicates the pulverization of the aggregated bulk material into primary nanoparticles, which is effectively beneficial for synthesizing a homogeneous wrapped composite with rGO. The cathode composite demonstrates a high initial capacity of 196.5 mAh/g and a stable capacity retention of 83% after 100 cycles at a current density of 20 mA/g. The high-rate capability shows 195 and 140 mAh/g at a current density of 50 and 500 mA/g, respectively. The high-rate capable performance is attributed to the rapid lithium ion diffusivity, which is confirmed by calculating the transformation kinetics of the lithium ion by galvanostatic intermittent titration technique (GITT) measurement. The lithium ion diffusion rate ( D Li ) of the rGO-wrapped LiNi 0.6 Co 0.2 Mn 0.2 O 2 composite is ca . 20 times higher than that of lithium metal plating on anode during the charge procedure, and this is demonstrated by the high interconnection of LiNi 0.6 Co 0.2 Mn 0.2 O 2 and conductive rGO sheets in the composite. The unique transformation kinetics of the cathode composite presented in this study is an unprecedented verification example of a high-rate capable Ni-rich cathode material wrapped by highly conductive rGO sheets.

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Rate capability for Na-doped Li1.167Ni0.18Mn0.548Co0.105O2 cathode material and characterization of Li-ion diffusion using galvanostatic intermittent titration technique

Cited by 50 publications

References 38 publications

Enhancing the Kinetics of Li‐Rich Cathode Materials through the Pinning Effects of Gradient Surface Na⁺ Doping

Enhancing the Kinetics of Li‐Rich Cathode Materials through the Pinning Effects of Gradient Surface Na⁺ Doping

Layer‐Based Heterostructured Cathodes for Lithium‐Ion and Sodium‐Ion Batteries

High Lithium Ion Transport Through rGO-Wrapped LiNi0.6Co0.2Mn0.2O2 Cathode Material for High-Rate Capable Lithium Ion Batteries

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Rate capability for Na-doped Li1.167Ni0.18Mn0.548Co0.105O2 cathode material and characterization of Li-ion diffusion using galvanostatic intermittent titration technique

Cited by 50 publications

References 38 publications

Enhancing the Kinetics of Li‐Rich Cathode Materials through the Pinning Effects of Gradient Surface Na+ Doping

Enhancing the Kinetics of Li‐Rich Cathode Materials through the Pinning Effects of Gradient Surface Na+ Doping

Layer‐Based Heterostructured Cathodes for Lithium‐Ion and Sodium‐Ion Batteries

High Lithium Ion Transport Through rGO-Wrapped LiNi0.6Co0.2Mn0.2O2 Cathode Material for High-Rate Capable Lithium Ion Batteries

Contact Info

Product

Resources

About

Enhancing the Kinetics of Li‐Rich Cathode Materials through the Pinning Effects of Gradient Surface Na⁺ Doping

Enhancing the Kinetics of Li‐Rich Cathode Materials through the Pinning Effects of Gradient Surface Na⁺ Doping