High-performance lithium-ion batteries with 1.5 μm thin copper nanowire foil as a current collector

ABSTRACTSilicon is emerging as a very attractive anode material for lithium ion batteries due to its low discharge potential, natural abundance, and high theoretical capacity of 4200 mAh/g, more than ten times that of graphite (372 mAh/g). This high charge capacity is the result of silicon’s ability to incorporate 4.4 lithium atoms per silicon atom; however, the incorporation of lithium also leads to a 300-400% volume expansion during charging, which can cause pulverization of the material and loss of access to the silicon. The architecture of the anode must therefore be able to adapt to this volume increase. Here we present a layered carbon nanotube and silicon nanoparticle electrode structure, fabricated using directed assembly techniques. The porous carbon nanotube layers maintain electrical connectivity through the active material and increase the surface area of the current collector. Using this architecture, we obtain an initial capacity in excess of 4000 mAh/g, as well as increased power and energy density as compared to anodes fabricated using the standard procedure of slurry casting.

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Facile Fabricated of CNT Based Free-Standing Electrode with Cotton Carbon for Flexible Lithium-Ion Batteries

Materials International ◽

10.33263/materials22.157163 ◽

2020 ◽

Vol 2 (2) ◽

pp. 157-163

Keyword(s):

Lithium Ion Batteries ◽

High Performance ◽

High Capacity ◽

Lithium Ion ◽

Free Standing ◽

Flexible Electrode ◽

Active Materials ◽

Commercial Preparation ◽

Experimental Process ◽

A Current

Flexible lithium ion batteries (FLIBs) are considered as potential application in the next 20 years for wearable devices and internet of things. However, it is a rough road to commercial preparation of flexible electrodes due to the complicated experimental process and expensive cost. Herein, a- facile fabricated strategy, filtration, is applied to disperse active materials LiFePO4 in conductive flexible network (LFP/CNTs/cotton) as a free-standing cathode for FLIBs. The fabricated free-standing LFP/CNTs/cotton electrode holds promising electrochemical stability, which still has a high capacity of 120 mAh/g at a current density of 2000 mA/g for 900 cycles. In addition, this method can be easily replicated for the flexibility of other powder active materials. This study is of great significance for the industrialization of the flexible electrode and exhibiting great potential in high-performance flexibility energy-related systems.

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A 3D pore-nest structured silicon–carbon composite as an anode material for high performance lithium-ion batteries

Inorganic Chemistry Frontiers ◽

10.1039/c7qi00463j ◽

2017 ◽

Vol 4 (12) ◽

pp. 1996-2004 ◽

Cited By ~ 13

Author(s):

Yankai Li ◽

Zhi Long ◽

Pengyuan Xu ◽

Yang Sun ◽

Kai Song ◽

...

Keyword(s):

Lithium Ion Batteries ◽

Anode Material ◽

Current Density ◽

High Performance ◽

Lithium Ion ◽

Carbon Composite ◽

Nest Structure ◽

Composite Anode ◽

Silicon Carbon ◽

A Current

A novel silicon–carbon composite with a 3D pore-nest structure denoted as Si@SiOx/CNTs@C was prepared and studied, and the capacity of a Si@SiOx/CNTs@C composite anode can be maintained at above 1740 mA h g−1 at a current density of 0.42 A g−1 after 700 cycles.

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