JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Mengyuan Song,Changhao Tian,Chunguang Chen,Tao Huang,Aishui Yu
Lithium-oxygen batteries show great energy storage potential due to their high energy density . However, it is difficult for conventional liquid electrolytes to form a stable solid electrolyte interface (SEI) on cathode surface to ensure long-term stable cycling of lithium-oxygen batteries . Herein, LiBOB is added to the LiTFSI-based electrolyte to solve the above-mentioned problems. By introducing LiBOB into LiTFSI single-salt electrolyte system, the electron delocalization of the BOB − anion induces the dissociation equilibrium of the lithium salt to occur positively and the formed electrolyte exhibits good ionic conductivity . Different amounts of LiBOB show different characteristics in electrochemical performance. Trace amounts of LiBOB as an additive increase the solvation of Li + and improve the discharge capacity of the cell. Furthermore, the synergistic effect of the LiTFSI-LiBOB dual-salt electrolyte forms a protective SEI when LiBOB has a larger proportion of lithium salts in the electrolyte, resulting in comparable cycling performance. This work demonstrates a promising approach to design electrolytes for long-term stable cycling of lithium-oxygen batteries.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2013
·Vol. 20
·期 6
·789-794
·
IF 1.674
Cui Xiaoling,Zhang Hongming,Li Shiyou,Li Xiaotong,Feng Huixia
Lithium bis(oxalate)borate (LiBOB) is a promising salt for lithium-ion batteries. However, it is necessary to exert the electrochemical performance of LiBOB by the appropriate solvent. With dimethyl sulfite (DMS) as mixed solvents, the electrochemical behavior of γ -butyrolactone (GBL) with LiBOB is studied in this paper. It shows that LiBOB-GBL/DMS electrolyte has high oxidation potential (>5.3 V) and satisfactory conductivities. When used in lithium and mesophase carbon microbead cells, the novel electrolyte exhibits not only excellent film-forming characteristics but also low impedances of the interface films. Besides, when used in LiFeO 4 /Li cells, compared to the cell with the electrolyte system of 1 mol L −1 LiPF 6 –ethylene carbonate (EC)/dimethyl carbonate (DMC) (1:1, v/v), LiBOB-based electrolyte exhibits several advantages, such as more stable cycle performance at room temperature and higher mean voltage.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Qiujun Wang,Pin Zhang,Weiqi Zhu,Zhaojin Li,Di Zhang,Huan Wang,Huilan Sun,Bo Wang,Shang-Sen Chi
The practical application of solid-state batteries is limited by the relatively low ionic conductivity of solid polymer electrolytes (SPEs) and the high charge transfer resistance resulting from poor interfacial wettability between electrodes and solid electrolytes of inorganic solid electrolytes (ISEs). In this manuscript, a dual-salt dual-network composite electrolyte is prepared by adjusting the content of lithium bis(oxalato)borate (LiBOB) and Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 (LLZTO), and a composite electrolyte with excellent long cycle and interfacial stability is designed. The as-prepared composite electrolyte that includes 77 wt% gel electrolyte, 20 wt% LLZTO and 3 wt% LiBOB (assigned as PDFL-20LLZTO-3LiBOB) has a high ionic conductivity of 1.69 × 10 −3 S cm −1 and a high lithium-ion migration number of 0.833 at 25 °C. The Li metal battery (LMB) with PDFL-20LLZTO-3LiBOB exhibits excellent cycling stability with 94% capacity retention at 25 °C for 100 cycles. The corresponding symmetrical Li|PDFL-20LLZTO-3LiBOB|Li can cycle for over 1200 h with excellent long-term stability. This impressive electrochemical performance is attributed to the in-situ formation of a dense and uniform solid electrolyte interface (SEI) rich in LiF and B–F at the interface under the dual action of LiBOB and fluoroethylene carbonate (FEC). In addition, the high ionic conductivity and high ionic mobility number are favorable for uniform deposition of Li and stable interfacial compatibility.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Fengwei Bai,Yan Li,Ziyu Chen,Yongchao Zhou,Chengzong Li,Tao Li
High-voltage lithium (Li)-metal batteries with cell-level energy density over 350 Wh kg −1 are promising energy storage systems . However, the aggressive interphase chemistries associated with highly reactive Li-metal anode and high-voltage cathodes impede their practical applications. Herein, we demonstrate the targeted stabilization of solid electrolyte interphase (SEI) and cathode electrolyte interphase (CEI) in high-voltage Li-metal batteries by asymmetrically sustained-releasing different additives. An asymmetric sustained-release film loaded with lithium bis-(oxalate)borate (LiBOB) and LiNO 3 on each side is investigated as a proof-of-concept. The sustained-releasing of LiBOB and LiNO 3 can maintain a localized concentration at the high-voltage cathode and Li-metal anode fronts respectively, thus forming a stable B-containing CEI and N-containing SEI. As such, issues like dendrites growth, parasitic side reactions and transition metals dissolution under high-voltage are addressed simultaneously. Based on this strategy, the 30 μm Li|LiNi 0.5 Co 0.2 Mn 0.3 O 2 (4.1 mAh cm −2 ) batteries deliver a capacity retention of 80% after 173 cycles under a cut-off voltage of 4.5 V.
研究领域:
储能系统
·
电池技术
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·Vol. 35
·期 38
·2503713
·
IF 19
Caiyan Shen,Dichang Guan,Wenchao Liu,Yanbing Cao,Zhongdong Peng,Yu Ren,Litao Kang,Jinhao Meng,Zhichen Xue,Ke Du
The development of fluorine-free electrolytes offers a promising route for more environmentally sustainable lithium-ion batteries (LIBs). However, the low solubility of fluorine-free lithium salts in conventional carbonate solvents limits this progress. Additionally, while strongly coordinating solvents enhance salt dissolution, their use can lead to co-intercalation in graphite, complicating electrolyte design. Herein, lithium bis(oxalate)borate (LiBOB) is chosen as lithium salt, and a synergistic electrolyte design strategy is employed, combining a strongly coordinating solvent (tris(2-methylpropyl) phosphine oxide, TMP) and weakly coordinating solvent (dimethyl carbonate, DMC). This approach enables the use of fluorine-free lithium salts while ensuring compatibility with graphite by modulating the primary coordination shell. Furthermore, this solvation structure enables the formation of an inorganic-dominated cathode electrolyte interphase (CEI) on the LiMn 2 O 4 (LMO) and a solid electrolyte interphase (SEI) on the graphite, improving lithium-ion conductivity and overall electrochemical performance. Additionally, compared to lithium hexafluorophosphate (LiPF 6 ), fluorine-free lithium salt minimized the formation of HF by-products, suppressing transition metals (TMs) dissolution. As a result, 1 Ah LMO||graphite pouch cell with fluorine-free electrolyte retains 92.8% of its capacity after 200 cycles, demonstrating excellent cycling stability and delivering high-rate capacity of 0.8486 Ah at 2 C, compared to 84.8% retention and 0.652 Ah with the conventional electrolyte.
研究领域:
电化学
·
能源材料
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电池技术
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可持续化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）