The invention belongs to the field of manufacturing of
lithium batteries, and relates to a nanometer
chitosan composite diaphragm of a
lithium battery and a manufacturing method of the nanometer
chitosan composite diaphragm. An ionic
polymer membrane material composed of a (nanometer
chitosan sol particles and
micrometer chitosan
sol particles) network and olefin copolymerized latex /
polyethylene oxide is provided. According to the ionic
polymer membrane material, the (nanometer chitosan
sol particles and
micrometer chitosan sol particles) network is adopted as a support body, and the nanometer chitosan composite diaphragm is formed through
curtain coating and
drying. The diaphragm has excellent three-dimensional network conformation, the
porosity is 80% or more, and the thickness of the diaphragm is 5-60 micrometers. The diaphragm has no stress effect or form
memory effect, has good
chemical stability, form dimensional stability,
thermal stability, insulativity and excellent physical
mechanical strength (including tension resistance,
impact resistance and flexibility in bending and the like), and has good adsorption affinity with an
electrolyte. The nanometer chitosan composite diaphragm has positive charge characteristics, and can provide a free channel for positive electric
lithium ions.