Wide-temperature range and high safety electrolytes for high-voltage Li-metal batteries

Pan, Anran; Wang, Zhicheng; Zhang, Fengrui; Wang, Lei; Xu, Jingjing; Zheng, Jieyun; Hu, Jianchen; Zhao, Chenglong; Wu, Xiaodong

doi:10.1007/s12274-022-4655-1

Cited by 24 publications

(18 citation statements)

References 52 publications

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“…Such a high areal capacity at À 40 °C outperforms many previous works about LIBs at low temperatures (Figure 5e). [40][41][42][43][44][45][46][47][48][49][50][51][52][53]…”

Section: Resultsmentioning

confidence: 99%

Low‐Temperature and High‐Areal‐Capacity Rechargeable Lithium Batteries enabled by π‐Conjugated Systems

Cheng

Sun

Wang

et al. 2022

Batteries & Supercaps

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High mass loading and high areal capacity are essential for lithium-ion batteries (LIBs) with high energy density, but they usually suffer from the sluggish charge-transfer kinetic of thick electrodes, especially at low temperature. Here, organic molecule perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) has been investigated as a feasible cathode for high areal capacity rechargeable LIBs operated at low temperature. Specifically, the charge storage process mainly occurs on the surface redoxactive groups of PTCDA, resulting in a fast kinetics of charge storage. Meanwhile, the delocalization of electrons in the πconjugated systems of PTCDA could enhance the electron transportation prominently. Consequently, the Li-PTCDA battery with a high mass loading of 14.35 mg cm À 2 delivers a high reversible areal capacity of 1.06 mAh cm À 2 at À 40 °C. This work demonstrates a great potential of π-conjugated organic materials for low temperature and high-areal-capacity rechargeable LIBs.

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“…Such a high areal capacity at À 40 °C outperforms many previous works about LIBs at low temperatures (Figure 5e). [40][41][42][43][44][45][46][47][48][49][50][51][52][53]…”

Section: Resultsmentioning

confidence: 99%

Low‐Temperature and High‐Areal‐Capacity Rechargeable Lithium Batteries enabled by π‐Conjugated Systems

Cheng

Sun

Wang

et al. 2022

Batteries & Supercaps

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“…Similarly, the SEI layer formed in the commercial electrolyte mainly includes organic compounds arising from the decomposition of carbonate solvents and LiPF 6 , such as CC/CH, ROCO 2 Li (533.7 eV in O 1s), Li 2 CO 3 (532.0 eV in O 1s), Li x PF y O z (134.1 eV in P 2p) and LiF (Figure 4c; Figure S10, Supporting Information), which cannot suppress dendrites growth. [16,30,31] In contrast, the SEI layer formed in 2.4m-DEF mainly contains the decomposed productions of FEC and DFOB − anions, which includes a higher intensity of LiF, CO and BO/BF, and weaker CC/CH (Figure 4d; Figure S9, Supporting Information). These results are consistent of the above theoretical calculation results, further demonstrating more FEC and DFOB − participate in the Li + solvation structure in 2.4m-DEF and they are preferentially decomposed to form more LiF and borides, which can effectively stabilize the electrolyte/Li anode interface and suppress the growth of Li dendrites.…”

Section: Influence Of Electrolytes On Sei Components Formed On LI Metalmentioning

confidence: 99%

High‐Energy‐Density Lithium Metal Batteries with Impressive Li⁺ Transport Dynamic and Wide‐Temperature Performance from −60 to 60 °C

Han

Wang

Huang

et al. 2023

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temperature range between −20 and 55 °C. [3][4][5] Especially LIBs hardly work when the temperature is below −30 °C because of commercial carbonate electrolytes, which often include LiPF 6 salt, cyclic ethylene carbonate (EC), and linear carbonate solvents (such as dimethyl carbonate (DMC), diethyl carbonate (DEC)). The commercial carbonate electrolytes usually exhibit high freezing points and high viscosity at low temperature, resulting in sluggish Li + transport and charge transfer kinetics at low temperature. [6][7][8] This severely limits their application in electric vehicles, defense applications, and space exploration. The requirements for developing high-energydensity and wide-temperature energy storage devices become very urgent. [9,10] To improve energy density, lithium (Li) metal batteries (LMBs) containing Li metal anode and nickel (Ni)-rich LiNi x Co y Mn z O 2 (x ≥ 0.9) cathode have attracted extensive attention due to low electrochemical potential of Li metal (−3.04 V compared to standard hydrogen electrode) and high specific capacity (3860 mA h g −1 of Li metal, >200 mA h g −1 of LiNi 0.9 Co 0.05 Mn 0.05 O 2 ). [11][12][13] However, LiPF 6 salt is easily decomposed to produce HF and carbonate solvents are continuously oxidized/reduced at electrode/electrolyte interface, which will cause serious corrosion to Ni-rich cathode and Li metal anode. [14] As a result, during the cycling process, Li dendrites High-energy-density Li metal batteries (LMBs) with Nickel (Ni)-rich cathode and Li-metal anode have attracted extensive attention in recent years. However, commercial carbonate electrolytes bring severe challenges including poor cycling stability, severe Li dendrite growth and cathode cracks, and narrow operating temperature window, especially hardly work at below −40 °C. In this work, a 2.4 m lithium difluoro(oxalato)borate (LiDFOB) in ethyl acetate (EA) solvent with 20 wt% fluorocarbonate (FEC) (named 2.4m-DEF) is designed to solve Li + transport dynamic at low temperature and improve interfacial stability between electrolyte with Li anode or Ni-rich cathode. Beneficial lower freezing point, lower viscosity, and higher dielectric constant of EA solvent, the electrolyte exhibits excellent Li + transport dynamic. Relying on the unique Li + solvation structure, more DFOB − anions and FEC solvents are decomposed to establish a stable solid electrolyte interface at electrolyte/ electrode. Therefore, LiNi 0.9 Co 0.05 Mn 0.05 O 2 (NCM90)/Li LMB with 2.4m-DEF enables excellent rate capability (184 mA h g −1 at 30 C) and stable cycling performance with ≈93.7% of capacity retention after 200 cycles at 20 C and room temperature. Moreover, the NCM90/Li LMB with 2.4m-DEF exhibits surprising ultra-low-temperature performance, showing 173 mA h g −1 at −40 °C and 152 mA h g −1 at −60 °C, respectively.

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Section: Highly Concentrated Liquid Electrolytes and Local Highly Con...mentioning

confidence: 99%

Nonflammable Liquid Electrolytes for Safe Lithium Batteries

Mu,

Ding,

et al. 2023

Small Structures

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Lithium‐based batteries (lithium‐ion batteries, lithium‐metal batteries, and lithium–sulfur batteries, etc.) have become one of the most irreplaceable energy‐storage devices and shown huge application potential. However, the traditional liquid electrolytes used in lithium‐based batteries are flammable and exhibit poor electrochemical stability, which will significantly limit the further development of high energy density and high safety lithium‐based batteries. Thus, it is crucial to develop nonflammable electrolytes. In this work, the reasons why traditional liquid electrolyte is unsafe and the recent progress of nonflammable liquid electrolytes including flame‐retardant‐based electrolytes, highly concentrated electrolytes, localized high concentrated electrolytes, and ionic liquids–based electrolytes are summarized. The challenges and future perspectives toward how to decrease the fire hazard of lithium‐based batteries through liquid electrolyte design are also put forward.

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Wide-temperature range and high safety electrolytes for high-voltage Li-metal batteries

Cited by 24 publications

References 52 publications

Low‐Temperature and High‐Areal‐Capacity Rechargeable Lithium Batteries enabled by π‐Conjugated Systems

Low‐Temperature and High‐Areal‐Capacity Rechargeable Lithium Batteries enabled by π‐Conjugated Systems

High‐Energy‐Density Lithium Metal Batteries with Impressive Li⁺ Transport Dynamic and Wide‐Temperature Performance from −60 to 60 °C

Nonflammable Liquid Electrolytes for Safe Lithium Batteries

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Wide-temperature range and high safety electrolytes for high-voltage Li-metal batteries

Cited by 24 publications

References 52 publications

Low‐Temperature and High‐Areal‐Capacity Rechargeable Lithium Batteries enabled by π‐Conjugated Systems

Low‐Temperature and High‐Areal‐Capacity Rechargeable Lithium Batteries enabled by π‐Conjugated Systems

High‐Energy‐Density Lithium Metal Batteries with Impressive Li+ Transport Dynamic and Wide‐Temperature Performance from −60 to 60 °C

Nonflammable Liquid Electrolytes for Safe Lithium Batteries

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High‐Energy‐Density Lithium Metal Batteries with Impressive Li⁺ Transport Dynamic and Wide‐Temperature Performance from −60 to 60 °C