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METHOD OF PROCESSING ACTIVE MATERIALS FOR USE IN SECONDARY ELECTROCHEMICAL CELLS

03/25/2008 02:23:52 PM EDT
PCT Biblio Info

Pub. Number WO2008033717
Appl. Data US07077809 20070907
Applicant VALENCE TECHNOLOGY, INC.
Inventor(s) DONG, Ming
Title METHOD OF PROCESSING ACTIVE MATERIALS FOR USE IN SECONDARY
ELECTROCHEMICAL CELLS
Abstract The present invention provides a method for the processing of
particles of metal phosphates or particles of mixed metal phosphates and in
particular lithiated metal phosphates and mixed metal phosphates. The
processing occurs, for example using a mechanofusion system as depicted in
Figures 1 and 2. In general, the powder materials are placed in a rotary
container and are subjected to centrifugal force and securely pressed against
the wall of the container. The material then undergoes strong compression and
shearing forces when it is trapped between the wall of the container and the
inner piece of the rotor with a different curvature (Figure 2). Particles of
the material are brought together with such force that they adhere to one
another. In the mechanofusion system, as indicated in Figure 2, the powder
material is delivered through slits on the rotary walls. It is carried up above
the rotors by the rotor-mounted circulating blades. Subsequently, the material
returns again to the rotors where it is are subjected to strong compression and
shearing forces from the inner pieces of the rotor. This cycle of both
three-dimensional circulation and effective compression/shearing of the powder
material is repeated at high speeds, thereby forming it into a composite
electroactive material (powder).

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