Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Hu Lv,Wang Jinzhu,Wang Kai,Gu Zhenqi,Xi Zhiwei,Li Hui,Chen Fang,Wang Youxi,Li Zhenyu,Ma Cheng
To enable the development of all-solid-state batteries, an inorganic solid-state electrolyte should demonstrate high ionic conductivity (i.e., > 1 mS cm −1 at 25 °C), compressibility (e.g., > 90% density under 250−350 MPa), and cost-effectiveness (e.g., < $50/kg). Here we report the development and preparation of Li 1.75 ZrCl 4.75 O 0.5 oxychloride solid-state electrolyte that demonstrates an ionic conductivity of 2.42 mS cm −1 at 25 °C, a compressibility enabling 94.2% density under 300 MPa and an estimated raw materials cost of $11.60/kg. As proof of concept, the Li 1.75 ZrCl 4.75 O 0.5 is tested in combination with a LiNi 0.8 Mn 0.1 Co 0.1 O 2 -based positive electrode and a Li 6 PS 5 Cl-coated Li-In negative electrode in lab-scale cell configuration. This all-solid-state cell delivers a discharge capacity retention of 70.34% (final discharge capacity of 70.2 mAh g −1 ) after 2082 cycles at 1 A g −1 , 25 °C and 1.5 tons of stacking pressure.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-11
·
IF 17.694
Sun Zongjie,Xi Kai,Chen Jing,Abdelkader Amor,Li Meng-Yang,Qin Yuanyuan,Lin Yue,Jiang Qiu,Su Ya-Qiong,Vasant Kumar R.,Ding Shujiang
Ionic-conductive polymers are appealing electrolyte materials for solid-state lithium-based batteries. However, these polymers are detrimentally affected by the electrochemically-inactive anion migration that limits the ionic conductivity and accelerates cell failure. To circumvent this issue, we propose the use of polyvinyl ferrocene (PVF) as positive electrode active material. The PVF acts as an anion-acceptor during redox processes, thus simultaneously setting anions and lithium ions as effective charge carriers. We report the testing of various Li||PVF lab-scale cells using polyethylene oxide (PEO) matrix and Li-containing salts with different anions. Interestingly, the cells using the PEO-lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) solid electrolyte deliver an initial capacity of 108 mAh g −1 at 100 μA cm −2 and 60 °C, and a discharge capacity retention of 70% (i.e., 70 mAh g −1 ) after 2800 cycles at 300 μA cm −2 and 60 °C. The Li|PEO-LiTFSI|PVF cells tested at 50 μA cm −2 and 30 °C can also deliver an initial discharge capacity of around 98 mAh g −1 with an electrolyte ionic conductivity in the order of 10 −5 S cm −1 .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-11
·
IF 17.694
Liu Yuzhao,Meng Xiangyu,Wang Zhiyu,Qiu Jieshan
Anode-free lithium batteries without lithium metal excess are a practical option to maximize the energy content beyond the conventional design of Li-ion and Li metal batteries. However, their performance and reliability are still limited by using low-capacity oxygen-releasing intercalation cathodes and flammable liquid electrolytes. Herein, we propose quasi-solid-state anode-free batteries containing lithium sulfide-based cathodes and non-flammable polymeric gel electrolytes. Such batteries exhibit an energy density of 1323 Wh L −1 at the pouch cell level. Moreover, the lithium sulfide-based anode-free cell chemistry endows intrinsic safety thanks to a lack of uncontrolled exothermic reactions of reactive oxygen and excess Li inventory. Furthermore, the non-flammable gel electrolyte, developed from MXene-doped fluorinated polymer, inhibits polysulfide shuttling, hinders Li dendrite formation and further secures cell safety. Finally, we demonstrate the improved cell safety against mechanical, electrical and thermal abuses.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2022
·Vol. 16
·期 6
·8269-8280
·
IF 10.269
Wu Hao,Song Ziyu,Wang Xingxing,Feng Wenfang,Zhou Zhibin,Zhang Heng
Effective passivation of aluminum (Al) current collector at high potentials (> 4.0 V vs. Li/Li + ) is of essence for the long-term operation of lithium-based batteries. Unfortunately, the non-aqueous liquid electrolytes comprising lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and organic carbonates are corrosive toward Al current collector at high potentials (> 4.0 V vs. Li/Li + ), despite their intriguing features (e.g., good chemical stability and high ionic conductivity). Herein, we propose the utilization of N,N-dimethyl fluorosulfonamide (DMFSA) as electrolyte solvent for suppressing Al corrosion in the LiTFSI-based electrolytes. It has been demonstrated that the electrolyte of 1.0 M LiTFSI-DMFSA shows decent ionic conductivities (1.76 mS·cm −1 at 25 °C) with good fluidities (2.44 cP at 25 °C). In particular, the replacement of organic carbonates (e.g., ethylene carbonate and ethyl methyl carbonate) with DMFSA leads to significant suppressed Al corrosion. Morphological and compositional characterizations utilizing scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) reveal that DMFSA favors the formation of insoluble species (i.e., aluminum fluoride (AlF 3 )) on the surface of Al electrode, which effectively inhibits continuous exposure of fresh Al surface to electrolyte during cycling. This work provides not only a deeper understanding on the Al corrosion in LiTFSI-based electrolyte but also an elegant path to stabilize the Al current collector at high potentials (> 4.0 V vs. Li/Li + ), which may give an impetus into the development of lithium-based batteries.
研究领域:
电化学
·
材料科学
·
储能技术
·
腐蚀科学
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）