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Liu Y, Xiao K, Yang S, Sun J, Li S, Liu X, Cai D, Zhang Y, Nie H, Yang Z. Organic Electrolyte Additive: Dual Functions Toward Fast Sulfur Conversion and Stable Li Deposition for Advanced Li-S Batteries. Small 2024:e2309890. [PMID: 38420897 DOI: 10.1002/smll.202309890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 02/08/2024] [Indexed: 03/02/2024]
Abstract
Lithium-sulfur (Li-S) battery is of great potential for the next generation energy storage device due to the high specific capacity energy density. However, the sluggish kinetics of S redox and the dendrite Li growth are the main challenges to hinder its commercial application. Herein, an organic electrolyte additive, i.e., benzyl chloride (BzCl), is applied as the remedy to address the two issues. In detail, BzCl can split into Bz· radical to react with the polysulfides, forming a Bz-S-Bz intermediate, which changes the conversion path of S and improves the kinetics by accelerating the S splitting. Meanwhile, a tight and robust solid electrolyte interphase (SEI) rich in inorganic ingredients namely LiCl, LiF, and Li2 O, is formed on the surface of Li metal, accelerating the ion conductivity and blocking the decomposition of the solvent and lithium polysulfides. Therefore, the Li-S battery with BzCl as the additive remains high capacity of 693.2 mAh g-1 after 220 cycles at 0.5 C with a low decay rate of 0.11%. This work provides a novel strategy to boost the electrochemical performances in both cathode and anode and gives a guide on the electrolyte design toward high-performance Li-S batteries.
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Affiliation(s)
- Yahui Liu
- Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou University, Wenzhou, 325035, China
| | - Kuikui Xiao
- Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou University, Wenzhou, 325035, China
| | - Shuo Yang
- Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou University, Wenzhou, 325035, China
- College of Electrical and Electronic Engineering, Wenzhou University, Wenzhou, 325035, China
| | - Jiangdong Sun
- Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou University, Wenzhou, 325035, China
| | - Shirui Li
- Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou University, Wenzhou, 325035, China
| | - Xi Liu
- Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou University, Wenzhou, 325035, China
| | - Dong Cai
- Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou University, Wenzhou, 325035, China
| | - Yinhang Zhang
- Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou University, Wenzhou, 325035, China
| | - Huagui Nie
- Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou University, Wenzhou, 325035, China
| | - Zhi Yang
- Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou University, Wenzhou, 325035, China
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Lao Z, Han Z, Ma J, Zhang M, Wu X, Jia Y, Gao R, Zhu Y, Xiao X, Yu K, Zhou G. Band Structure Engineering and Orbital Orientation Control Constructing Dual Active Sites for Efficient Sulfur Redox Reaction. Adv Mater 2024; 36:e2309024. [PMID: 37848387 DOI: 10.1002/adma.202309024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 10/06/2023] [Indexed: 10/19/2023]
Abstract
The kinetics difference among multistep electrochemical processes leads to the accumulation of soluble polysulfides and thus shuttle effect in lithium-sulfur (Li-S) batteries. While the interaction between catalysts and representative species has been reported, the root of the kinetics difference, interaction change among redox reactions, remains unclear, which significantly impedes the catalysts design for Li-S batteries. Here, this work deciphers the interaction change among electrocatalytic sulfur reactions, using tungsten disulfide (WS2 ) a model system to demonstrate the efficiency of modifying electrocatalytic selectivity via dual-coordination design. Band structure engineering and orbital orientation control are combined to guide the design of WS2 with boron dopants and sulfur vacancies (B-WS2- x ), accurately modulating interaction with lithium and sulfur sites in polysulfide species for relatively higher interaction with short-chain polysulfides. The modified interaction trend is experimentally confirmed by distinguishing the kinetics of each electrochemical reaction step, indicating the effectiveness of the designed strategy. An Ah-level pouch cell with B-WS2- x delivers a gravimetric energy density of up to 417.6 Wh kg-1 with a low electrolyte/sulfur ratio of 3.6 µL mg-1 and negative/positive ratio of 1.2. This work presents a dual-coordination strategy for advancing evolutionarily catalytic activity, offering a rational strategy to develop effective catalysts for practical Li-S batteries.
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Affiliation(s)
- Zhoujie Lao
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China
| | - Zhiyuan Han
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China
| | - Jiabin Ma
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China
| | - Mengtian Zhang
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China
| | - Xinru Wu
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China
| | - Yeyang Jia
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China
| | - Runhua Gao
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China
| | - Yanfei Zhu
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China
| | - Xiao Xiao
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China
| | - Kuang Yu
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China
| | - Guangmin Zhou
- Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China
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