Positive electrode for secondary lithium metal battery and method of making
AssigneeGM Global Technology Operations LLC
InventorsMeinan He, Biqiong Wang, Mei Cai
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Abstract
A positive electrode for an electrochemical cell of a secondary lithium metal battery may include an aluminum metal substrate and a protective layer disposed on a major surface of the aluminum metal substrate. The protective layer may include a conformal aluminum fluoride coating layer. A positive electrode active material layer may overlie the protective layer on the major surface of the aluminum metal substrate. The positive electrode active material layer may include a plurality of interconnected pores, which may be infiltrated with a nonaqueous electrolyte that includes a lithium imide salt.
Claims20
A positive electrode for an electrochemical cell of a secondary lithium metal battery, the positive electrode including:
- an aluminum metal substrate having a major surface;
- a protective layer formed ex situ on the major surface of the aluminum metal substrate;
- a positive electrode active material layer overlying the protective layer on the major surface of the aluminum metal substrate, the positive electrode active material layer comprising a plurality of interconnected pores;
- and
- a nonaqueous electrolyte consisting essentially of a lithium imide salt dissolved in a nonaqueous, aprotic organic solvent, the nonaqueous electrolyte infiltrating the interconnected pores of the positive electrode active material layer,
- wherein the protective layer comprises a conformal aluminum fluoride coating layer, and
- wherein the nonaqueous electrolyte is substantially free of LiPF6.
An electrochemical cell for a secondary lithium metal battery, the electrochemical cell including:
- a negative electrode including:
- a metallic substrate having a major surface and a lithium metal layer disposed on the major surface of the metallic substrate;
- a positive electrode including:
- an aluminum metal substrate having a major surface, a protective layer formed ex situ on the major surface of the aluminum metal substrate, and a positive electrode active material layer overlying the protective layer on the major surface of the aluminum metal substrate;
- and
- a nonaqueous electrolyte in ionic contact with the positive electrode and with the negative electrode,
- wherein the protective layer comprises a conformal aluminum fluoride coating layer,
- wherein the non-aqueous electrolyte consists essentially of a lithium imide salt dissolved in a nonaqueous, aprotic organic solvent, and
- wherein the nonaqueous electrolyte is substantially free of LiPF6.
A method of manufacturing a positive electrode for an electrochemical cell of a secondary lithium metal battery, the method including:
- providing an aluminum metal substrate having a major surface;
- forming a conformal aluminum fluoride coating layer directly on the major surface of the aluminum metal substrate;
- forming a positive electrode active material layer on the major surface of the aluminum metal substrate over the conformal aluminum fluoride coating layer;
- and then
- infiltrating the positive electrode active material layer with a nonaqueous liquid electrolyte solution consisting essentially of a lithium imide salt dissolved in a nonaqueous, aprotic organic solvent,
- wherein the nonaqueous electrolyte is substantially free of LiPF6.
Dependencies are inferred from the claim text.