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RECORD 1: UNFILED PROVISIONAL PATENT SPECIFICATION & DRAFT CLAIMS (EXCERPT)
Docket No.: NVEL-2026-PROV-01
Client: Novalis Solid-State Energy Labs Inc.
Title: Scandium-Tantalum Co-Doped Garnet-Type Solid Electrolyte and Lithium Battery Comprising Same
Inventors: Dr. Elena Rostova, Marcus Chen
Status: Confidential Non-Public Invention Disclosure — DO NOT TRANSMIT VIA PUBLIC NETWORKS
Filing Target: USPTO Provisional (Planned: 2026-10-15)

1. TECHNICAL FIELD & ABSTRACT
The present disclosure relates to a lithium-stuffed garnet-type solid electrolyte having a cubic crystal structure, characterized by dual cation substitution of zirconium sites using both scandium (Sc) and tantalum (Ta), exhibiting bulk ionic conductivity exceeding 1.85 mS/cm at 25°C and critical current density (CCD) exceeding 3.5 mA/cm² without dendritic short-circuiting.

2. DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
The solid electrolyte composition is represented by the formula:
    Li_(7+x-y) La_3 Zr_(2-x-y) Sc_x Ta_y O_12
wherein 0.08 <= x <= 0.22, and 0.15 <= y <= 0.35.
The co-doping of Sc^3+ and Ta^5+ into the Zr^4+ octahedral sites stabilizes the high-conductivity cubic phase down to -40°C while suppressing the low-conductivity tetragonal phase. Sintering is conducted at 1,075°C to 1,120°C in an oxygen-rich atmosphere for 4 hours, utilizing lithium borate as a transient liquid-phase sintering aid at 1.2 wt%. The resulting ceramic pellet achieves relative density of 97.8% of theoretical crystal density with an average grain size between 3.2 and 5.4 micrometers.

3. DRAFT CLAIMS FOR NOVELTY AND NON-OBVIOUSNESS EVALUATION
Claim 1 (Independent):
A solid electrolyte material comprising:
  a cubic garnet-type crystalline oxide represented by the general formula Li_(7+x-y) La_3 Zr_(2-x-y) Sc_x Ta_y O_12,
  wherein 0.08 <= x <= 0.22 and 0.15 <= y <= 0.35;
  wherein the solid electrolyte exhibits a total ionic conductivity at 25°C of at least 1.70 x 10^-3 S/cm (1.70 mS/cm);
  and wherein the relative sintered density is at least 96.5% with an average grain boundary impedance below 18 Ohm*cm².

Claim 2 (Dependent):
The solid electrolyte material of claim 1, wherein the average grain size of the ceramic oxide is between 3.0 and 6.0 micrometers, and the critical current density at 25°C exceeds 3.0 mA/cm².