Wei Chen

By Xiaogang Sun, Manyuan Cai, Long Chen, Zhiwen Qiu, Jie Wang, Xu Li and Wei Chen

Lithium ion batteries (LIB) and supercapacitors (electric double-layer capacitors (EDLCs) and lithium ion capacitors (LIC)) are the most energy storage service for mobile application. Lithium ion batteries are currently the most popular type of battery for powering portable electronic devices and are growing in popularity for defense, automotive and aerospace applications. The investigation of supercapacitors (SCs) has also achieved significant progresses. Although they have shown remarkable commercial successes, the electrodes and their constituent materials are still the subject of intensive research. Our research focused on a new type of carbon nanotube-cellulose composite materials as current collector of LIBs and as electrodes of SCs for improving and enhancing the energy/power density and cyclic performance of them. Carbon nanotubes (CNTs) have been widely used as conductive agent for both anodes and cathodes to replace super carbon black to satisfy the multifunctional requirements for LIBs.

Part of the book: Carbon Nanotubes

By Xiaogang Sun, Jie Wang, Wei Chen, Xu Li, Manyuan Cai, Long Chen, Zhiwen Qiu, Yapan Huang, Chengcheng Wei, Hao Hu and Guodong Liang

Transparent conducting films have a wide range of applications in the fields of flat panel displays, solar cells, and touch panels for their both good conductivity and light transmittance. Carbon nanotubes (CNTs) transparent conducting film has become a potential alternative for next-generation transparent conducting film systems owing to high conductivity, light transmittance and flexibility. The multiwalled carbon nanotubes (MWCNTs) conductive liquid was prepared by dispersing MWCNTs in alcohol through ultrasonic and high-speed shearing process with an addition of carbon nanotube alcohol dispersant (TNADIS) as the dispersant. The transparent conducting film was fabricated on polyethylene terephthalate (PET) transparent film by spin-coating process. The film was used as interlayer between the electrode and the separator to improve electrochemical performance of lithium-sulfur (Li-S) batteries.

Part of the book: Transparent Conducting Films

By Xiaogang Sun, Wei Chen, Xu Li, Jie Wang, Hao Hu, Guodong Liang, Yapan Huang and Chengcheng Wei

Lithium-ion capacitors (LICs) have a wide range of applications in the fields of hybrid electric vehicles (HEVs) and electric vehicles (EVs) for their both high energy density and high power density. Lithium-ion capacitors have become a potential alternative for next-generation chemical energy storage equipment owing to high energy density, high power density, and excellent cycle performance. The prelithiated multiwalled carbon nanotubes (MWCNTs) electrode was prepared by internal short circuit (ISC) and doping to intercalate lithium into MWCNTs. SLMP and lithium metal were used as lithium resources, respectively. The prelithiated carbon nanotubes were used as anode and activated carbon electrode as cathode. The capacitors were assembled in a glove box filled with argon. The prelithiated MWCNTs electrode eliminated irreversible capacity and improved substantially electrochemical performance of lithium-ion capacitors.

Part of the book: Science, Technology and Advanced Application of Supercapacitors

By Xiaogang Sun, Xu Li, Wei Chen, Jie Wang, Chengcheng Wei, Yapan Huang, Guodong Liang and Hao Hu

Lithium-ion battery (LIB) has occupied the main position of portable electronic devices, and it is also playing an important role in energy storage and large energy storage. Thin film devices based on their diverse functions have great potential for wide application. Novel thin film devices need to be created for the improvement of electrochemical performance and safety of LIB. Our research focused on transparent conductive films and new flexible porous carbon nanotube films for improving and enhancing the energy/power density and cyclic performance of LIB. Meanwhile, different carbon nanotube films have their own additional advantages in strength and thermal conductivity to meet various functional requirements of LIBS.

Part of the book: Lithium-ion Batteries