NOVELTY - Electrode comprises: a polyphosphazene cyclomatrix comprising phosphazene compounds, where each phosphazene compound of the phosphazene compounds comprises phosphorus-nitrogen units and at least one pendant group bonded to each phosphorus atom of the phosphorus-nitrogen units, and crosslinkages, where each crosslinkage of the crosslinkages bonds the pendant group of one phosphazene compound of the phosphazene compounds with the pendant group of another phosphazene compound of the phosphazene compounds; and particles within pores of the polyphosphazene cyclomatrix.    USE - The electrode is useful in electrochemical cells (claimed), which is useful in lithium-ion battery, lithium metal battery, sensors (e.g. identification sensors, fire alarms, smoke detectors, motion detectors, temperature sensors, humidity sensors and chemical sensors), medical applications (e.g. blood analyzers, pulse oximeters, defibrillators, telemetry systems and external pacemakers), military applications (e.g. transmitters, surveillance devices, guidance, positioning systems and thermal imaging systems), electric vehicle applications, motive power applications (e.g. hybrid vehicles, plug-in hybrid vehicles and electric vehicles), uninterruptible power supply applications, communications applications (e.g. broadcast, audio and visual), stationary applications (e.g. grid storage), computing applications (e.g. memory backup devices), transportation applications, and metering applications.    ADVANTAGE - The electrode exhibits improved lithium capacity, electrical conductivity, thermal, electrical and mechanical stability, electrochemical performance, interfacial compatibility, energy storage capacity, elasticity, porosity, energy density, recyclability, mechanical properties e.g. rigidity, durability and longer cycle life in an economical manner.    DETAILED DESCRIPTION - Electrode comprises: a polyphosphazene cyclomatrix comprising phosphazene compounds, where each phosphazene compound of the phosphazene compounds comprises phosphorus-nitrogen units and each phosphorus-nitrogen unit is bonded to an adjacent phosphorus-nitrogen unit, and at least one pendant group bonded to each phosphorus atom of the phosphorus-nitrogen units, and crosslinkages, where each crosslinkage of the crosslinkages bonds the pendant group of one phosphazene compound of the phosphazene compounds with the pendant group of another phosphazene compound of the phosphazene compounds; and particles within pores of the polyphosphazene cyclomatrix. INDEPENDENT CLAIMS are included for:    (1) forming an electrode, comprising forming an electrode composition comprising phosphazene compounds, particles, and at least one crosslinking agent, and applying the electrode composition on at least one surface of a current collector (14); and    (2) an electrochemical cell (10) comprising a negative electrode (12) comprising the polyphosphazene cyclomatrix, and particles within pores of the polyphosphazene cyclomatrix, a positive electrode (18), and a separator (16) comprising at least one electrolyte between the negative electrode and the positive electrode.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of an electrochemical cell.    Electrochemical cell (10)    Negative electrode (12)    Current collector (14)    Separator (16)    Positive electrode. (18)