英语翻译As the demand for powerful and large Li-ion batteries gr

英语翻译
As the demand for powerful and large Li-ion batteries grows,
LiFePO4 has received much attention as a positive electrode
(cathode) material due to its high stability.Ever since it was
introduced by Radhi et al.[1],many efforts have been made
to enhance its low conductance.Among the ways proposed to
achieve this,carbon coatings are considered to be promising
[2–5].
When slurries for the cathode are made,carbon powder (conductive
material) does not guarantee good electrical contact with
all the active material particles,because the active material may
not be fully covered with the carbon power.Some particles may
be isolated from others,while others may be only partly covered
with carbon.Prior to making the slurry,the carbon coating on
the active material can be processed to make better electrical
contact among the particles.The coating can remarkably reduce
‘dead zones’ where active particles are coagulated or poorly
networked with the carbon.
Typically,a small amount of carbonaceous materials are
mixed with the active material,followed by sintering of the
mixture under inert gas.Any carbon coating can improve the
conductance tremendously,regardless of the quality.Several
conditions need to be improved for real applications,however,
∗ Corresponding author.Tel.:+82 55 2801665; fax:+82 55 2801590.
E-mail address:kkim@keri.re.kr (K.Kim).
such as the ratio of the active material,the thickness of the
electrodes,the densities of the coatings and so on.In order to
improve these factors,one needs to consider the surface interaction
between the carbonaceous and active materials before
furnace treatment.
In the step that produces a homogeneous carbon coating,
the active material is evenly soaked with a solution of the carbonaceous
material.The latter material approaches the surface
of LiFePO4 with its functional groups properly oriented.The
conformation between LiFePO4 and the carbonaceous material
greatly affects the quality of the coating.If the LiFePO4 interacts
favourably with the carbonaceous material,this solution–solid
interaction may lead to a high-quality carbon coating when it
is sintered.On the other hand,if the surface interaction is not
favourable,the quality and density of the carbon coating may be
damaged.The surface properties of LiFePO4 are unknown,and
they vary depending on how the material is treated during the
synthetic and coating processes.For example,LiFePo4 could
be polar,non-polar,hydrophobic or hydrophilic.Carbonaceous
materials that have multiple functional groups can favourably
interact with LiFePO4 regardless of these various properties.A
material that can interact with all of these random properties
could be soap.The raw materials of soaps are fatty acids or surfactants.

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