Stabilizing high voltage LiCoO2 cathode in aqueous electrolyte with interphase-forming additive

Fei Wang, Yuxiao Lin, Liumin Suo, Xiulin Fan, Tao Gao, Chongyin Yang, Fudong Han, Yue Qi, Kang Xu, Chunsheng Wang

Research output: Contribution to journalArticle

  • 22 Citations

Abstract

Aqueous lithium ion batteries (ALIBs) receive increasing attention due to their intrinsic non-flammable nature. Their practical application, however, has been prevented by the poor electrochemical stability of aqueous electrolytes, which severely restricts the choice of anode and cathode materials for such batteries and leads to low energy densities. It has been demonstrated that "water-in-salt" electrolytes can provide an expanded voltage window of ∼3.0 V, which can accommodate electrode materials that were otherwise forbidden in conventional aqueous electrolytes. In this study, we showed that the presence of an additive could further stabilize the aqueous electrolyte at a high voltage cathode surface. By forming a cathode electrolyte interphase (CEI) through electrochemical oxidation of tris(trimethylsilyl) borate (TMSB), we successfully stabilized LiCoO2 in water-in-salt electrolyte at a high cut-off voltage that corresponds to 0.7e electron charge transfer. To the best of our knowledge, this is also the first electrolyte additive known to form an interphase in aqueous electrolytes. The formed CEI significantly suppressed electrolyte oxidation as well as cobalt dissolution from LiCoO2 into electrolytes, allowing LiCoO2 to be stably charged/discharged at a higher cut-off voltage with a high capacity utilization of 170 mA h g-1. When paired with an Mo6S8 anode, the 2.5 V aqueous full cell delivered a high energy density of 120 W h kg-1 for 1000 cycles with an extremely low capacity decay rate of 0.013% per cycle.

LanguageEnglish (US)
Pages3666-3673
Number of pages8
JournalEnergy and Environmental Science
Volume9
Issue number12
DOIs
StatePublished - Dec 1 2016

Profile

electrolyte
Electrolytes
Cathodes
Electric potential
Anodes
Salts
salt
oxidation
Borates
borate
Water
Electrochemical oxidation
Cobalt
lithium
cobalt
energy
Charge transfer
Dissolution
electrode
dissolution

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

Cite this

Wang, F., Lin, Y., Suo, L., Fan, X., Gao, T., Yang, C., ... Wang, C. (2016). Stabilizing high voltage LiCoO2 cathode in aqueous electrolyte with interphase-forming additive. Energy and Environmental Science, 9(12), 3666-3673. DOI: 10.1039/c6ee02604d

Stabilizing high voltage LiCoO2 cathode in aqueous electrolyte with interphase-forming additive. / Wang, Fei; Lin, Yuxiao; Suo, Liumin; Fan, Xiulin; Gao, Tao; Yang, Chongyin; Han, Fudong; Qi, Yue; Xu, Kang; Wang, Chunsheng.

In: Energy and Environmental Science, Vol. 9, No. 12, 01.12.2016, p. 3666-3673.

Research output: Contribution to journalArticle

Wang, F, Lin, Y, Suo, L, Fan, X, Gao, T, Yang, C, Han, F, Qi, Y, Xu, K & Wang, C 2016, 'Stabilizing high voltage LiCoO2 cathode in aqueous electrolyte with interphase-forming additive' Energy and Environmental Science, vol 9, no. 12, pp. 3666-3673. DOI: 10.1039/c6ee02604d
Wang F, Lin Y, Suo L, Fan X, Gao T, Yang C et al. Stabilizing high voltage LiCoO2 cathode in aqueous electrolyte with interphase-forming additive. Energy and Environmental Science. 2016 Dec 1;9(12):3666-3673. Available from, DOI: 10.1039/c6ee02604d
Wang, Fei ; Lin, Yuxiao ; Suo, Liumin ; Fan, Xiulin ; Gao, Tao ; Yang, Chongyin ; Han, Fudong ; Qi, Yue ; Xu, Kang ; Wang, Chunsheng. / Stabilizing high voltage LiCoO2 cathode in aqueous electrolyte with interphase-forming additive. In: Energy and Environmental Science. 2016 ; Vol. 9, No. 12. pp. 3666-3673
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