Conductive Carbon Nanotubes Composite (CNTC) - Increasing Tap Density and Electrode Life in Lithium Ion Batteries using Conductive Nanotubes Composite by Cheap Tubes

Topics Covered

Introduction
Conductive Nanotubes Composite
Increasing the Life Cycle of Li-ion Battery using Conductive Nanotubes Composite
Conductive Nanotubes Composite - Usage Method
Conductive Nanotubes Composite - Technical data

Introduction

Carbon Nanotubes (CNTs) are one of best electrically conductive nanofibers. They can form conductive networks easily in Li-Ion battery electrodes. Nanotubes can also prevent the destruction of the electrode material caused by the repeated expansion and contraction of the electrode materials during charging and discharging. Thus, the capacity of battery does not decline. The main barrier to utilizing CNTs for Lithium Ion Battery applications is that pure CNTs can't be dispersed easily, because the CNTs are entangled with each other heavily. Conductive Nanotubes Composite (CNTC) from Cheap Tubes is specifically made to address this problem and improve lithium ion battery performance.

Conductive Nanotubes Composite

Cheap Tubes Conductive Nanotubes Composite is composed of CNTs and of grain electric conductive additives. By adding grain conductive additives to CNTs, the entangled CNTs are well separated. As a result the CNTs can be dispersed easily in battery electrode materials. In addition, because of synergetic effect between CNTs and grain materials, the discharge capacity and cycle life of Li-ion battery can be improved remarkably. After adding Conductive Nanotubes Composite Additive, the tap density of battery electrode coatings can increase 10%.

Increasing the Life Cycle of Li-ion Battery using Conductive Nanotubes Composite

Using Cheap Tubes Conductive Nanotubes Composite, the life cycle of 700mAh053048 Li-ion battery can be prolonged by an order of magnitude, table 1 shows the details.

Table 1. The test result of 700mAh053048 Li-ion battery, of which cathode prepared by LiCoO2 or LiFePO4, anode made by artificial graphite

 

LiCoO2

LiFePO4

Tap Density(g/cm3)

SP+KS-6

Multi-CNTs

SP+KS-6

Multi-CNTs

 

3.6

3.8

2.1

2.4

Cycle Life(1C/1C)

500cycles

75.3%

91.2%

89.2%

95.8%

1000cycles

/

84.0%

83.1%

92.4%

Figure 1. Graph of Capacity Retention vs. Number of Cycles/n

Conductive Nanotubes Composite - Usage Method

Cheap Tubes Conductive Nanotubes Composite product can be used on anode and cathode of Li-ion battery, with the solvents oil or water. When using, disperse equally the additive in pure solvent (water or NMP), then add in binders and mix for about 2 hours, finally add in the active materials and mix for 4-6 hours. The appropriate quantity of additive is 2-3wt.% on cathode and 1-2wt.% on anode.

Figure 2. SEM image of CNTC

Figure 3. SEM image of electrode added CNTC

Conductive Nanotubes Composite - Technical data

Property

Value

Tube Diameter(d50)

60 - 80 nm

Tube Length

10 - 15 µm

BET Nitrogen Surface Area

55 - 75 m2/g

Adsorption Value

500 - 550 ml/100g

Density (in the bag)

120 kg/m3

Volume Resistivity

2 - 5 x 10-4 ohm.cm

Moisture(as packed)

0.1 - 0.3 %

Ash Content

0.3 max %

pH

8-9

Appearance

Black Powder

Source: Cheap Tubes Inc.

For more information on this source please visit Cheap Tubes.

Date Added: Apr 8, 2009 | Updated: Jun 11, 2013
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