RSC Advances
·
2022
·Vol. 12
·期 43
·27881-27888
·
IF 4.036
Peng Cui,Chun Sun,Hanqing Dai,Wei Wei
Block copolymer electrolytes represented by polyurethane (PU) have become the forefront field of organic solid-state electrolytes for high-performance lithium-metal batteries due to their superb mechanical properties. However, due to the existence of mechanical hard segments, discontinuous ion transition at the electrolyte–electrode contact is inevitable, which leads to a series of problems such as terrible polarization phenomena, poor cycle stability and inadequate capacity retention. Here, we propose a new strategy to improve the chemical stability and interaction of electrolyte–electrode by modulating soft segments, which successfully reduces the polarization phenomenon. Then a new composite polymer solid electrolyte based on block copolymer PU (abbr. SPE) was prepared by ion-conduct segment modification using P2S5 with high lithium-ion affinity, and the ion conductivity of the SPE reached 7.4 × 10−4 S cm−1 (25 °C) and 4.3 × 10−3 S cm−1 (80 °C) respectively. The assembled LFP|SPE|Li displays a high specific capacity and stable charging/discharging platforms. Besides, an excellent retention capacity of 90% is obtained after 2000 cycles at 5C, and the lithium symmetric battery exhibits no significant polarization over 750 h. This work provides a viable strategy to suppress the polarization phenomenon to develop new block copolymer electrolytes with long cycle stability and high capacity retention.
研究领域:
材料科学
·
电化学
·
储能技术
·
电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Bo Fan,Wenzhi Li,Zhongkuan Luo,Xianghua Zhang,Hongli Ma,Ping Fan,Bai Xue
Using solid–liquid hybrid electrolytes is an effective strategy to overcome the large solid/solid interfacial resistance in all-solid-state batteries and the safety problems in liquid batteries. The properties of the solid/liquid electrolyte interphase layer (SLEI) are essential for the performance of solid–liquid hybrid electrolytes. In this work, the solvation reactions between Li2S–P2S5 glass-ceramic solid electrolytes (SEs) and ether electrolytes were studied, and their influence on the SLEI was examined. Although 1,2-dimethoxyethane (DME) reacted with the Li2S–P2S5 glass-ceramic SE to form a dense SLEI, 1,3-dioxolane (DOL) severely corroded the SE, resulting in a loose SLEI. Consequently, a stable SLEI formed with DME. Using a combination of the Li2S–P2S5 glass-ceramic SE and the DME-based liquid electrolyte (LE), stable lithium plating/stripping cycles over 1000 h and a hybrid Li–S battery that retained a specific capacity of 730 mAh g–1 after 200 cycles were demonstrated. The knowledge of the reactions between the sulfide electrolytes and the organic LEs is instructive for the design of stable sulfide–liquid hybrid electrolytes for advanced batteries.
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
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Zhixuan Wang,Yi Jiang,Juan Wu,Yong Jiang,Shoushuang Huang,Bing Zhao,Zhiwen Chen,Jiujun Zhang
All-solid-state lithium batteries have been recognized as the next generation energy storage/conversion devices for many high-power and safe applications. Li 7 P 3 S 11 glass ceramics, as a promising solid electrolyte, has shown a high application possibility. Although the synthesis of Li 7 P 3 S 11 by wet-chemical method is more controllable and can be well matched with the existing battery preparation processes, the chemical reaction mechanism of such a liquid-phase reaction process is not fully understood, and also its ionic conductivity is lower than that obtained by solid-state methods. In this paper, we have clarified that the liquid-phase reaction is mainly the process of lone-pair electrons of Li 2 S to attack the bridged S on P 2 S 5 to obtain compounds with different element ratios, which is explored by recording different reaction times and adjusting different proportions of the phase transitions in acetonitrile (ACN) solvent. The only precipitate phase is found to be Li 3 PS 4 ·ACN, which can react with soluble phases with higher P content such as Li 2 P 4 S 11 , Li 4 P 4 S 12 and so on to obtain Li 4 P 2 S 7 for the formation of Li 3 PS 4 ·ACN and Li 4 P 2 S 7 ·ACN (molar ratio 1:1) in the liquid phase . Finally, Li 7 P 3 S 11 is formed by the equimolar reaction of above two compounds during the calcination. XPS and Raman results indicate that the low conductivity of liquid-phase synthesized Li 7 P 3 S 11 solid electrolyte may be induced by the residual Li 4 P 2 S 6 , which is caused by the inadequate contact and coverage of gel-like Li 4 P 2 S 7 with solid Li 3 PS 4 , resulting in the desulfurization reaction of Li 4 P 2 S 7 during the heat-treatment.
研究领域:
材料科学
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固态化学
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储能
·
电化学
·
锂电池
✓ 已验证
DOI
高影响因子
SOLID STATE IONICS
·
2017
·
IF 2.354
Qiang Zhang,Xiayin Yao,Jean Pierre Mwizerwa,Ning Huang,Hongli Wan,Zhen Huang,Xiaoxiong Xu
Transition metal sulfides have attracted particular interests owing to their extremely higher specific capacity and more compatible with sulfide electrolyte than lithium transition-metal oxide for all-solid-state lithium batteries. FeS nanosheets with thickness of 10 nm are synthesized by a poly (vinyl alcohol)-assisted precipitation method and further successfully employed in Li/70%Li 2 S-29%P 2 S 5 –1%P 2 O 5 /Li 10 GeP 2 S 12 /FeS all-solid-state lithium batteries. The obtained all-solid-state lithium batteries show reversible discharge capacity of 550 mAh g − 1 after 50 cycles at current density of 0.1 A g − 1 and exhibit superior rate performances.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 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）