Electrodes for rechargeable lithium batteries
AssigneeValence Technology, Inc.
InventorRene Koksbang
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Abstract
In an electrochemical cell having an active metal negative electrode, a positive electrode and a electrolyte separator there is provided a first layer between the negative electrode and the electrolyte separator, the layer comprises a carbon-based material which is a conductor of electrons and a conductor of metal ions of the negative electrode. The layer restricts penetration of electrolytic organic and anionic salt constituents therethrough and prevents degradation of the negative electrode.
Claims21
A battery comprising:
- a) an electrolyte;
- b) a negative electrode having an active material consisting essentially of lithium or alloys thereof and being in the form of a solid body having a major surface facing the electrolyte;
- and
- c) a layer between the major surface of the electrode and the electrolyte for reducing passivation of the electrode body, said layer comprising particles of carbon retained in a binder matrix material.
A battery comprising:
- a) an electrolyte;
- b) a negative electrode having an active material consisting essentially of lithium or alloys thereof and being in the form of a solid body having a major surface facing the electrolyte;
- and
- c) a layer between the major surface of the electrode and the electrolyte for reducing passivation of the electrode body, said layer being electronically conductive and ionically conductive of metal ions of the negative electrode.
In a battery having a lithium-containing negative electrode body, a positive electrode body, an electrolyte separator in the form of a polymeric network containing an electrolyte solution comprising a metal salt of the negative electrode disposed between the negative and positive electrode bodies, the improvement comprising a layer between the negative electrode body and the polymeric network, said layer comprising carbon-based material being electronically conductive and conductive of metal ions of the negative electrode and capable of restricting penetration of electrolyte therethrough.
A method of making an electrode structure for a lithium battery having metallic lithium or lithium alloy active material comprising:
- a) forming a mixture of polymeric binder material and carbon particles;
- and
- b) applying the mixture onto a major surface of the metallic lithium body and curing the applied mixture for a time sufficient to form an adhered coating of said mixture on the body with said carbon particles retained by the matrix.
Dependencies are inferred from the claim text.