Organic/inorganic composite porous film and electrochemical device prepared thereby
AssigneeLG Chem, Ltd.
InventorsHyun Hang Yong, Sang Young Lee, Seok Koo Kim, Soon Ho Ahn, Jung Don Suk
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Abstract
Disclosed is an organic/inorganic composite porous film comprising: (a) inorganic particles; and (b) a binder polymer coating layer formed partially or totally on surfaces of the inorganic particles, wherein the inorganic particles are interconnected among themselves and are fixed by the binder polymer, and interstitial volumes among the inorganic particles form a micropore structure. A method for manufacturing the same film and an electrochemical device including the same film are also disclosed. An electrochemical device comprising the organic/inorganic composite porous film shows improved safety and quality.
Claims25
A battery separator comprising an organic/inorganic composite porous film, which comprises a mixture of:
- (a) inorganic particles;
- and
- (b) a binder polymer coating layer formed partially or totally on surfaces of the inorganic particles,
- wherein
- the inorganic particles are interconnected among themselves and are fixed by the binder polymer disposed between the inorganic particles, and
- the interconnected inorganic particles define uniformly distributed interstitial volumes wherein the interstitial volumes define a pore structure,
- wherein the inorganic particles have a size of between 0.001 μm and 10 μm,
- wherein the inorganic particles are present in the mixture of inorganic particles with the binder polymer in an amount of 50-99 wt % based on 100 wt % of the mixture, and
- wherein the binder polymer has a solubility parameter of between 15 and 45 MPa1/2, and
- wherein the organic/inorganic composite porous film is free-standing and a surface of the organic/inorganic composite porous film is macroscopically smooth.
An electrochemical device comprising:
- (a) a cathode;
- (b) an anode;
- (c) a separator comprising an organic/inorganic composite porous film, which comprises a mixture of:
- (i) inorganic particles;
- and (ii) a binder polymer coating layer formed partially or totally on surfaces of the inorganic particles,
- wherein
- the inorganic particles are interconnected among themselves and are fixed by the binder polymer disposed between the inorganic particles, and
- the interconnected inorganic particles define uniformly distributed interstitial volumes wherein the interstitial volumes define a pore structure,
- wherein the inorganic particles have a size of between 0.001 μm and 10 μm,
- wherein the inorganic particles are present in the mixture of inorganic particles with the binder polymer in an amount of 50-99 wt % based on 100 wt % of the mixture, and
- wherein the binder polymer has a solubility parameter of between 15 and 45 MPa1/2, and
- wherein the organic/inorganic composite porous film is free-standing, and a surface of the organic/inorganic composite porous film is macroscopically smooth;
- and
- (d) an electrolyte.
Dependencies are inferred from the claim text.