Glassy embedded solid-state electrode assemblies, solid-state batteries and methods of making electrode assemblies and solid-state batteries
Batteries, component structures and manufacturing methods, in particular including a glassy embedded battery electrode assembly having a composite material structure composed of interpenetrating material components including a porous electroactive network including a solid electroactive material, and a continuous glassy medium including a Li ion conducting sulfide glass, can achieve enhanced power output, reduced charging time and/or improved cycle life.
1. A glassy embedded electrode assembly having first and second opposing major surfaces, the electrode assembly comprising:
a composite material structure having a thickness of from about 10 um-1000 um and composed of first and second interpenetrating material components;
wherein the first material component is a porous electroactive network comprising a solid electroactive material, the network having major opposing surfaces and a pore structure with open pores that extend into the network from the major opposing surfaces, the pores having interior pore surfaces;
wherein the second material component is a continuous glassy medium comprising a Li ion conducting sulfide glass;
wherein the glassy medium encapsulates the electroactive network in the form of a glassy cover region that is substantially devoid of crystalline particles; and
wherein the glassy medium extends into the depth of the electroactive network to form a three-dimensional solid-state interface with the electroactive network.
2. The glassy embedded electrode assembly of claim 1 wherein the three-dimensional solid-state interface is devoid of reaction products resulting from the Li ion conducting sulfide glass chemically reacting in direct contact with the electroactive material of the network.
3. The glassy embedded electrode assembly of claim 2 wherein the interface the Li ion conducting sulfide glass is not chemically oxidized in direct contact with the electroactive material of the network.
4. The glassy embedded electrode assembly of claim 1 wherein the electroactive network is a porous preformed electroactive monolith composed of cathode active material that is of the intercalation type.
5. The glassy embedded electrode assembly of claim 1 wherein the electroactive network is a porous preform that is a composite material of discrete electroactive particles held together by a binder material that is thermally stable for its utility as a binder when heated to T g of the glassy medium.
6. The glassy embedded electrode assembly of claim 1 wherein the composite material structure is formed by hot isostatic pressing a mixture of Li ion conducting glassy sulfide media particles and electroactive material particles.
7. The glassy embedded electrode assembly of claim 1 wherein the electroactive network has an areal capacity of about 0.5 to 10 mAh/cm 2 .