ISSN 1070-4272, Russian Journal of Applied Chemistry, 2016, Vol. 89, No. 7, pp. 1183−1188. © Pleiades Publishing, Ltd., 2016.
The text was submitted by the authors in English.
Olivine structural LiFePO
(LFP) as one of the most
promising cathode materials was studied for several
decades and widely applied in power battery ﬁ elds [1–8].
However, with the increasing demand for higher energy
and power density of Li-ion battery, as well as longer
cycle life, lower cost and higher safety, etc., there is still
a long way to improve the performance of LFP cathode
[9–12]. In the conventional preparation process of LFP
cathode, a typical tape casting process was used, in
which metal current collector, conductive carbon black
and PVDF binder are three necessary components, and
the performance of electrode was greatly inﬂ uenced
by electrode thickness, weight percentage of inactive
materials, and porosity [13–15]. Because current
collector, carbon and binder may be considered as inactive
mass and volume in the battery, thus thinner and lighter
foils, lower carbon and binder are expected to enhance the
gravimetric and volumetric energy densities of the cells.
However, thinner foils tend to be more expensive, lower
carbon would cause higher resistance, and lower binder
would inﬂ uence the instability of the electrode materials
at the interfaces of electrode/electrolyte or electrode/
current collector caused by the large volume change
during cycling. More importantly, the loading level of
LFP can not be increased by using the conventional tape
casting process in order to maintain a high conductivity of
the electrodes, which in turn would inﬂ uence the energy
density of the LFP battery [16, 17].
To solve this problem, some efforts have been taken
[18–23]. Martha et al.  found that carbon ﬁ bers have
a comparable electrochemical stability to Al foil and
may be used in place of Al foil. The prepared LFP/CF
cathode by using graphitized Pyrograf I carbon ﬁ bers as
current collector and mesophase P-Pitch as the binding
material shows that the carbon ﬁ ber composite cathodes
High Loading LiFePO
on Activated Carbon Fiber Cloth
as a High Capacity Cathode for Li-Ion Battery
*, Hong-ai Zhai
, Zhi-chao Pi
, Jing-quan Li
, Li-li Chen
, Xiang-qian Shen
, and Ke-song Xiao
Institute for Advanced Materials Science, Jiangsu University, Zhenjiang, 212013 China
Changsha Research Institute of Mining and Metallurgy, Co. Ltd., Changsha, 410012 China
*e-mail: email@example.com, firstname.lastname@example.org
Received June 3, 2016
/carbon ﬁ ber (LFP/CF) cathodes were prepared by using activated carbon ﬁ ber cloth
as current collector in place of conventional Al foil. The electrochemical properties of LFP/CF electrodes were
analyzed by the cyclic voltammetry and galvanostatic charge/discharge tests. The results indicate that the activated
carbon ﬁ ber cloth with high speciﬁ c surface area and high porosity makes the LFP/CF electrode that possesses
higher mass loading of 18–21 mg cm
and stronger redox reaction ability compared with Al foil-based electrode.
The LFP/CF electrode shows excellent rate performance and cycle stability. At 0.1C, the discharge capacity is
up to 190.1 mAh g
that exceeds the theoretical capacity due to the combination effect of battery and capacitor.
Furthermore, the LFP/CF electrode shows an initial capacity of 150.4 mAh g
at 1C with a capacity retention of
74.7% after 425 cycles, which is higher than 62.4% for LFP/Al foil electrode, and an initial discharge capacity
of 130 mAh g
at 5C with a capacity retention of 61.5% after 370 cycles. But this composite electrode is not
suitable for charging/discharging at higher rate as 10C due to too much mass loading.