Triphenyl borate as a bi-functional additive to improve surface stability of Ni-rich cathode material

Yim, Taeeun; Jang, Seol Heui; Han, Young‐Kyu

doi:10.1016/j.jpowsour.2017.10.044

Cited by 61 publications

(23 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 189 ] Researchers aim to design additives to produce a stable CEI layer on the electrode surface, which allows Li + migration but prevents electron transfer between cathode and electrolyte, minimizing electrolyte decomposition. [ 190c,d,190 ] Many types of electrolyte additives have been tried to improve the interfacial stability of Ni‐rich layered cathodes, including sulfonate, [ 191 ] phosphite, [ 192 ] borate, [ 193 ] and lithium salts. [ 194 ] Even though beneficial effects are usually reported with novel additives, a systematic comparison of different additives or combination is needed to guide future studies.…”

Section: Anti‐degradation Strategiesmentioning

confidence: 99%

Probing and Resolving the Heterogeneous Degradation of Nickel‐Rich Layered Oxide Cathodes across Multi‐Length Scales

et al. 2020

View full text Add to dashboard Cite

though new energy storage devices such as lithium-sulfur batteries [2] and lithium-air batteries [3] have shown great promise due to large theoretical capacity, lithium ion batteries (LIBs) are still dominating in portable electronic devices, prevailing in electric vehicles, and gradually entering grid-energy storage markets. [4] The unsatisfactory energy density of cathodes is widely recognized as the critical bottleneck for higher-performance LIBs. [5] Among various cathodes, Ni-rich layered lithium transition-metal oxides possessing a larger reversible capacity (>180 mAh g −1) than LiCoO 2 (140 mAh g −1), LiNi 1/3 Co 1/3 Mn 1/3 O 2 (160 mAh g −1), LiMn 2 O 4 (120 mAh g −1), and LiFePO 4 (160 mAh g −1), are regarded as one of the most promising cathodes for the next-generation LIBs. [6] In 2016, American electric vehicle company Tesla launched Model 3 with LiNi 0.85 Co 0.10 Al 0.05 O 2 as the cathode for its electric vehicle battery, a testament to the huge potential of Ni-rich layered oxides (NRLOs) (Scheme 1). NRLO cathodes generally consist of two main categories-LiNi 1−x−y Co x Mn y O 2 (NMC) and LiNi 1−x−y Co x Al y O 2 (NCA). The evolution from LiCoO 2 /LiNiO 2 / LiMnO 2 to LiNi 1−x−y Co x Mn y O 2 has been introduced in previous reviews. [7] Briefly, synthesizing LiCoO 2 with the low-defect density was relatively accessible due to the large difference in ionic radius between Li + and Co 3+ , but the irreversible structural change takes place when more than half a fraction of Li + is extracted from its lattice, restricting the capacity. Stoichiometric LiNiO 2 is difficult to prepare due to the instability of trivalent Ni at high temperatures, and the cation mixing between Li and Ni weakens the cycling stability of LiNiO 2. [8] Synthesis of the layered LiMnO 2 phase is not straightforward either, and the capacity fades rapidly because the structural transformation from layered to spinel phase is inevitable upon cycling. [9] LiNi 1−x−y Co x Mn y O 2 combines the strengths of nickel (high capacity), cobalt (good rate capability), and manganese (benign stability). [7] The redox couples of Ni 2+ /Ni 3+ /Ni 4+ and Co 3+ /Co 4+ contribute to the majority of the capacity. The existence of cobalt suppresses the cation mixing during the synthesis of stoichiometric compounds, while manganese helps stabilize the Ni-rich layered oxides (NRLO) are widely considered among the most promising cathode materials for high energy-density lithium ion batteries. However, the high proportion of Ni content accelerates the cycling degradation that restricts their large-scale applications. The origins of degradation are indeed heterogeneous and thus there are tremendous efforts devoted to understanding the underlying mechanisms at multi-length scales spanning atom/lattice, particle, porous electrode, solid-electrolyte interface, and cell levels and mitigating the degradation of the NRLO. This review combines various advanced in situ/ex situ analysis techniques developed for resolving NRLO degradation at multi-length scales and aims...

show abstract

Section: Anti‐degradation Strategiesmentioning

confidence: 99%

Probing and Resolving the Heterogeneous Degradation of Nickel‐Rich Layered Oxide Cathodes across Multi‐Length Scales

et al. 2020

View full text Add to dashboard Cite

show abstract

“…It has been found that HF would accelerate the transition metal ions dissolution from LNCM811, resulting in electrode structural destruction and severe capacity fading [12,13,[18][19][20] . Application of electrolyte film-forming additive can create a protective (or cathode electrolyte interface, CEI) film on the high voltage cathode surface and improve the interfacial stability [12,13,[18][19][20][21][22] http://engine.scichina.com/doi/10.1016/j.jechem.2019.04.011…”

Section: Introductionmentioning

confidence: 99%

Insight into the interaction between Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode and BF4−-introducing electrolyte at 4.5 V high voltage

Lan

Zhou

Xing

et al. 2019

Journal of Energy Chemistry

View full text Add to dashboard Cite

“…One critical reason for the rapid fading of cycling retention is unstable surface reactivity of high‐Ni NCM cathode at elevated temperature 15‐22 . Although a high‐Ni composition evidently allows increases in specific capacity, the Ni 4+ (the charging product of the NCM cathode material) tends to be easily reduced because Ni 4+ is quite unstable in the cell.…”

Section: Introductionmentioning

confidence: 99%

Triethanolamine borate as a surface stabilizing bifunctional additive for Ni‐rich layered oxide cathode

et al. 2020

Self Cite

View full text Add to dashboard Cite

Summary Ni‐rich cathode materials have been receiving substantial highlight because of its large specific capacity, however, they suffer from inferior cycling results owing to occurring undesired reactions in the cell. Herein, triethanolamine borate (TEAB), containing borate and ethanolamine groups, is proposed as a functional additive because it spontaneously suppresses electrolyte decomposition while inhibiting Ni dissolution in Ni‐rich cathodes. The electrochemical oxidation of TEAB first generates borate‐based cathode‐electrolyte interphases for the Ni‐rich cathode, which effectively suppress the electrolyte decomposition. A cell controlled with TEAB showed a greatly decreased internal pressure, which improved the safety performance of the cell. Notably, even the inclusion of 0.1% TEAB in the cell markedly increased the cycling performance from 32.0% to 63.2%. Cells cycled with TEAB showed stable retention rate after 100 cycles at high temperature. Results of high‐temperature storage of the cells confirmed improvements as changes in the open‐circuit potentials, thickness of the cell, and the recovery rate for specific capacity. TEAB is also efficient for suppressing Ni dissolution because TEAB selectively scavenges fluoride species by a chemical scavenging reaction. The cell evaluated with TEAB‐containing electrolyte exhibited a releasing 140.3 ppm of dissolved Ni, whereas the cell evaluated with bare electrolyte released 643.6 ppm.

show abstract

Triphenyl borate as a bi-functional additive to improve surface stability of Ni-rich cathode material

Cited by 61 publications

References 32 publications

Probing and Resolving the Heterogeneous Degradation of Nickel‐Rich Layered Oxide Cathodes across Multi‐Length Scales

Probing and Resolving the Heterogeneous Degradation of Nickel‐Rich Layered Oxide Cathodes across Multi‐Length Scales

Insight into the interaction between Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode and BF4−-introducing electrolyte at 4.5 V high voltage

Triethanolamine borate as a surface stabilizing bifunctional additive for Ni‐rich layered oxide cathode

Contact Info

Product

Resources

About

Triphenyl borate as a bi-functional additive to improve surface stability of Ni-rich cathode material

Cited by 61 publications

References 32 publications

Probing and Resolving the Heterogeneous Degradation of Nickel‐Rich Layered Oxide Cathodes across Multi‐Length Scales

Probing and Resolving the Heterogeneous Degradation of Nickel‐Rich Layered Oxide Cathodes across Multi‐Length Scales

Insight into the interaction between Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode and BF4−-introducing electrolyte at 4.5 V high voltage

Triethanolamine borate as a surface stabilizing bifunctional additive for Ni‐rich layered oxide cathode

Contact Info

Product

Resources

About

Insight into the interaction between Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode and BF4−-introducing electrolyte at 4.5 V high voltage