Tuo Kang

Suzhou Institute of Nano-tech and Nano-bionics

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Yanbin Shen

Chinese Academy of Sciences

Liwei Chen

Shanghai Jiao Tong University

Feng Guo

University of Science and Technology of China

Yejun Qiu

Harbin Institute of Technology

Wei Lü

Nanjing University of Posts and Telecommunications

Jinghui Zhu

Shenzhen University

Chenghao Liu

McGill University

Jianghui Zhao

Anhui Polytechnic University

Lei Zheng

Pixelligent (United States)

Yanfei Zhao

Beijing National Laboratory for Molecular Sciences

Cooperative Institutions

Chinese Academy of Sciences

University of Science and Technology of China

Suzhou Institute of Nano-tech and Nano-bionics

University of Chinese Academy of Sciences

Harbin Institute of Technology

Shanghai Jiao Tong University

Shenzhen University

Shenzhen Institute of Information Technology

Suzhou Research Institute

Soochow University

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Self-Assembled Monolayer Enables Slurry-Coating of Li Anode

ACS Central Science (2019)

Tuo Kang Yalong Wang Feng Guo Chenghao Liu Jianghui Zhao

Li metal has long been considered as the ultimate anodic material for high-energy-density batteries. Protection of Li metal in electrochemical cycling and in the manufacturing environment is critical for practical applications. Here, we present the passivation of the Li metal-carbon nanotube (CNT) composite with molecular self-assembly of a long-chain aliphatic phosphonic acid. The dynamics of the self-assembly process is investigated with sum-frequency generation spectroscopy (SFG). The aliphatic phosphonic acid molecules self-assemble on the Li metal surface via the lithium phosphate bonding, while the well-aligned long chains of the molecules help to prevent corrosion of lithium by oxygen and water in the air. As a result, the self-assembled monolayer (SAM) passivated Li-CNT composite displays excellent stability in dry or even humid air, and could be slurry-coated with organic solvents. The resulting slurry-coated Li anode exhibits a high Coulombic efficiency of 98.8% under a 33% depth of discharge (DOD) at a 1C rate in full battery cycling. The concept of molecular self-assembly on Li metal and the stability of the resulting SAM layer open vast possibilities of designed reagents for surface passivation of Li, which may eventually pave the way for practical application of Li metal in secondary batteries.

Passivation

10.1021/acscentsci.8b00845

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Citations (72)

A polyimide cathode with superior stability and rate capability for lithium-ion batteries

Nano Research (2019)

Jianghui Zhao Tuo Kang Yanli Chu Peng Chen Feng Jin

10.1007/s12274-019-2306-y

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Citations (34)

Superionic Conductors via Bulk Interfacial Conduction

Journal of the American Chemical Society (2020)

Chenji Hu Yanbin Shen Ming Shen Xi Liu Hongwei Chen

Superionic conductors with ionic conductivity on the order of mS cm-1 are expected to revolutionize the development of solid-state batteries (SSBs). However, currently available superionic conductors are limited to only a few structural families such as garnet oxides and sulfide-based glass/ceramic. Interfaces in composite systems such as alumina in lithium iodide have long been identified as a viable ionic conduction channel, but practical superionic conductors employing the interfacial conduction mechanism are yet to be realized. Here we report a novel method that creates continuous interfaces in the bulk of composite thin films. Ions can conduct through the interface, and consequently, the inorganic phase can be ionically insulating in this type of bulk interface superionic conductors (BISCs). Ionic conductivities of lithium, sodium, and magnesium ion BISCs have reached 1.16 mS cm-1, 0.40 mS cm-1, and 0.23 mS cm-1 at 25 °C in 25 μm thick films, corresponding to areal conductance as high as 464 mS cm-2, 160 mS cm-2, and 92 mS cm-2, respectively. Ultralow overpotential and stable long-term cycling for up to 5000 h were obtained for solid-state Li metal symmetric batteries employing Li ion BISCs. This work opens new structural space for superionic conductors and urges for future investigations on detailed conduction mechanisms and material design principles.

Fast ion conductor

10.1021/jacs.0c07060

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Citations (134)

Annealing impact on the structural and optical properties of electrospun SnO2 nanofibers for TCOs

Ceramics International (2017)

Seshendra Reddy Liwen Zhang Tuo Kang Yangsen Lin Yejun Qiu

Electrospinning

Tetragonal crystal system

Rutile

10.1016/j.ceramint.2017.10.229

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Citations (7)

Dendrite-FreeLithium Anodes Enabled by a CommonlyUsed Copper Antirusting Agent

Figshare (2020)

Tuo Kang Jianghui Zhao Feng Guo Lei Zheng Yayun Mao

Li metal is considered the most promising anode for high energy density secondary batteries due to its high theoretical capacity and low redox potential. However, lithium is prone to form dendrites which will not only cause internal short-circuits but also bring accumulation of “dead Li” and result in fast capacity decay, thus its large-scale application is challenging. In this work, we demonstrate that the commonly used metal corrosion inhibitor, benzotriazole (BTA), can be used to modify the Cu foil surface and guide homogeneous Li+ plating/stripping due to the lithiophilic nature of the N atom in the BTA molecule. As a result, the lithium plated on the BTA modified Cu (BTA-Cu) substrate is free of dendrites, and a Coulombic efficiency (CE) as high as 99.0% was achieved for Li+ plating/stripping on the BTA-Cu substrate at a current density of 1 mA/cm2. Furthermore, the BTA-Cu foil can be used as an anode to assemble an anode-free cell (BTA-Cu∥LFP), and ∼73.3% of the initial capacity can be obtained after 50 cycles. Last but not the least, a BTA-Cu@Li electrode prepared by plating of Li+ on the BTA-Cu substrate can serve as a stable Li anode in a BTA-Cu@Li∥LFP cell and display an average cycled CE of 98.5% at a depth of discharge (DOD) of 33%. This simple method of Li+ plating/stripping behavior regulation could inspire researchers on the development of highly stable lithium metal anodes for high energy density batteries.

Stripping (fiber)

Plating (geology)

Benzotriazole

10.1021/acsami.9b19655.s001

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Citations (1)

Dendrite-Free Lithium Anodes Enabled by a Commonly Used Copper Antirusting Agent

ACS Applied Materials & Interfaces (2020)

Tuo Kang Jianghui Zhao Feng Guo Lei Zheng Yayun Mao

Li metal is considered the most promising anode for high energy density secondary batteries due to its high theoretical capacity and low redox potential. However, lithium is prone to form dendrites which will not only cause internal short-circuits but also bring accumulation of "dead Li" and result in fast capacity decay, thus its large-scale application is challenging. In this work, we demonstrate that the commonly used metal corrosion inhibitor, benzotriazole (BTA), can be used to modify the Cu foil surface and guide homogeneous Li+ plating/stripping due to the lithiophilic nature of the N atom in the BTA molecule. As a result, the lithium plated on the BTA modified Cu (BTA-Cu) substrate is free of dendrites, and a Coulombic efficiency (CE) as high as 99.0% was achieved for Li+ plating/stripping on the BTA-Cu substrate at a current density of 1 mA/cm2. Furthermore, the BTA-Cu foil can be used as an anode to assemble an anode-free cell (BTA-Cu∥LFP), and ∼73.3% of the initial capacity can be obtained after 50 cycles. Last but not the least, a BTA-Cu@Li electrode prepared by plating of Li+ on the BTA-Cu substrate can serve as a stable Li anode in a BTA-Cu@Li∥LFP cell and display an average cycled CE of 98.5% at a depth of discharge (DOD) of 33%. This simple method of Li+ plating/stripping behavior regulation could inspire researchers on the development of highly stable lithium metal anodes for high energy density batteries.

Dendrite (mathematics)

Lithium metal

10.1021/acsami.9b19655

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Citations (40)

Stable Lithium-Carbon Composite Enabled by Dual-Salt Additives

Nano-Micro Letters (2021)

Lei Zheng Feng Guo Tuo Kang Yingzhu Fan Wei Gu

Lithium metal is regarded as the ultimate negative electrode material for secondary batteries due to its high energy density. However, it suffers from poor cycling stability because of its high reactivity with liquid electrolytes. Therefore, continuous efforts have been put into improving the cycling Coulombic efficiency (CE) to extend the lifespan of the lithium metal negative electrode. Herein, we report that using dual-salt additives of LiPF6 and LiNO3 in an ether solvent-based electrolyte can significantly improve the cycling stability and rate capability of a Li-carbon (Li-CNT) composite. As a result, an average cycling CE as high as 99.30% was obtained for the Li-CNT at a current density of 2.5 mA cm-2 and an negative electrode to positive electrode capacity (N/P) ratio of 2. The cycling stability and rate capability enhancement of the Li-CNT negative electrode could be attributed to the formation of a better solid electrolyte interphase layer that contains both inorganic components and organic polyether. The former component mainly originates from the decomposition of the LiNO3 additive, while the latter comes from the LiPF6-induced ring-opening polymerization of the ether solvent. This novel surface chemistry significantly improves the CE of Li negative electrode, revealing its importance for the practical application of lithium metal batteries.

Carbon fibers

10.1007/s40820-021-00633-3

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Citations (15)

A sandwich-structured TiN/BN-C composite interlayer with enhanced performance for Li S batteries

Journal of Electroanalytical Chemistry (2020)

Jinghui Zhu Caiming Jiao Tuo Kang Liubiao Zhong Sanfei Zhao

Electrospinning

Carbon fibers

10.1016/j.jelechem.2020.113963

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Citations (7)

A lithium–carbon nanotube composite for stable lithium anodes

Journal of Materials Chemistry A (2017)

Yalong Wang Yanbin Shen Zhaolong Du Xiaofeng Zhang Ke Wang

Li metal has been considered as the ultimate anode material for high-density electrochemical energy storage technology because of its extremely high specific capacity (3860 mAh g⁻¹), lowest redox potential, and ability to enable battery chemistries with lithium free cathode materials.

Carbon fibers

Lithium battery

Lithium metal

Energy density

10.1039/c7ta08531a

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Citations (72)

Advanced Lithium Metal–Carbon Nanotube Composite Anode for High-Performance Lithium–Oxygen Batteries

Nano Letters (2019)

Feng Guo Tuo Kang Zhenjie Liu Bo Tong Limin Guo

The low Coulombic efficiency and hazardous dendrite growth hinder the adoption of lithium anode in high-energy density batteries. Herein, we report a lithium metal–carbon nanotube (Li–CNT) composite as an alternative to the long-term untamed lithium electrode to address the critical issues associated with the lithium anode in Li–O2 batteries, where the lithium metal is impregnated in a porous carbon nanotube microsphere matrix (CNTm) and surface-passivated with a self-assembled monolayer of octadecylphosphonic acid as a tailor-designed solid electrolyte interphase (SEI). The high specific surface area of the Li–CNT composite reduces the local current density and thus suppresses the lithium dendrite formation upon cycling. Moreover, the tailor-designed SEI effectively separates the Li–CNT composite from the electrolyte solution and prevents the latter's further decomposition. When the Li–CNT composite anode is coupled with another CNTm-based O2 cathode, the reversibility and cycle life of the resultant Li–O2 batteries are drastically elevated.

Lithium metal

Carbon fibers

10.1021/acs.nanolett.9b02560

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Citations (77)