Solid-State Batteries "Go Silent": Media Shuts Down, Are They Still Viable?

Recently, I’ve been scrolling through my phone and almost never see the words “solid-state battery” anymore. The trending searches are gone, the press conferences have stopped, and even brokerage research reports are now writing about “fast charging + structural optimization”—not because no one is working on it, but because everyone suddenly stopped mentioning it. I specifically reviewed the transcript of BYD’s press conference on March 12, and not once was “solid-state” mentioned in the official report. They only said, “Blade 2.0 + fast charging system successfully tested in -32°C in Mohe.” The capacity briefing released by CATL on the same day also didn’t use “solid-state” as the headline; instead, it listed a series of data: Kirin 3.0 yield rate 96.7%, 800V ultra-fast charging compatibility 100%, production line modification cycle 47 days.

This isn’t because the technology has failed; it’s because everyone can no longer casually talk about it. On December 1 last year, the “Part 1: Terminology and Classification of Solid-State Batteries for Electric Vehicles” officially took effect. The document clearly states: if the electrolyte contains more than 5% liquid components, it cannot be called a “solid-state battery”; only when the interface has no solvent residues, no ionic liquid additives, and the cell is sealed with zero leakage—then it qualifies as “all-solid-state.” Previously, many products labeled as “semi-solid,” “gel,” or “sulfide + trace electrolyte” were suddenly classified as “hybrid solid-liquid batteries.” I checked 37 new vehicle models announced on March 10 by the Ministry of Industry and Information Technology, and the battery descriptions uniformly said “lithium iron phosphate (structurally optimized)” or “ternary lithium (high safety electrolyte system),” with none daring to label them as “solid-state.”

The latest report from BYD’s Shenzhen Pingshan pilot line in February shows that sulfide all-solid-state cells have reached a single-cell capacity of 21.3Ah, but at -20°C, the discharge efficiency drops to only 63.8%, a significant gap from their own Blade 2.0’s 89%. CATL’s oxide route prototypes in Liyang, after 1,200 cycles, saw a 3.2-fold increase in interfacial impedance, requiring an additional layer of nano-passivation film to suppress it—this layer adds 18% to mass production costs. More practically, Xinwanda’s 20Ah polymer all-solid-state cell performs well in laboratory tests, but in their delivery notice to GAC on March 5, they wrote: “Small batch deliveries starting Q4 2026, limited to 500 units per month, only for extreme cold region testing vehicles.”

Fast charging technology, however, has already been implemented. The Avita 12, tested: at an 800V fast-charging station in a highway service area, 5 minutes of charging added 142 km of range, with the displayed battery level jumping from 21% to 58%. DeepBlue L07 is even more impressive—on March 8, it ran 300 km on the highway in Turpan with full air conditioning, and the displayed range decay was only 8.2%, 4.7 percentage points lower than the same model last year. None of this relies on solid-state batteries; it’s achieved through restructuring the cell design, upgrading cathode coating processes, and adding new lithium salts to the electrolyte—all traditional liquid battery techniques, just pushed further.

Production line modifications are also very practical. BYD’s Changsha factory at the end of last year converted an old Blade line into a dedicated fast-charging line, only removing three aging cabinets, installing seven new temperature control modules, costing less than 28 million yuan. Fully solid-state batteries, however, require entirely new vacuum environments, dry film coating, hot pressing, and stacking—according to the China Automotive Technology & Research Center’s estimate on March 11, building a 10 GWh fully solid-state production line would cost 1.43 billion yuan, 3.1 times more than upgrading the Blade line at the same time. Car companies are quick to calculate: now, when selling cars, what consumers really care about is “how far can I go in 5 minutes in the service area,” not whether the battery contains liquid.

Huawei’s “Doped Sulfide Interface Stability Report” published on March 6 contains a very straightforward statement: “Material performance is easy to understand, but mass production processes are hidden in the vibration frequency of equipment, roll gap tolerances, and moisture content in the nitrogen used for packaging.” I don’t understand tolerances, but I know that in Bishan, Chongqing, the new 20 GWh production line shipped 137,000 cells in the first week of March, with a yield rate of 92.4%—all Blade 2.0. Next door, a dust-proof shed is built, with a sign reading “Sulfide Pilot Verification Area (internal personnel only),” but there’s no sign at the door, and no news reports.

Last week, the Denza Z9GT conducted extreme cold tests in Heihe. After being stationary at -30°C for 8 hours, the Blade 2.0 fast-charging version charged from 15% to 85% in 11 minutes and 23 seconds; meanwhile, a test vehicle with Xinwanda’s 20Ah polymer solid-state cell, under the same conditions, stopped charging at 72%, with the BMS warning “interface temperature rising too quickly, protection engaged.” The first page of the report states: “Data is for technical verification only and does not constitute a mass production commitment.”

Solid-state batteries are still in development, just no longer on the stage. They haven’t disappeared; they’ve retreated into factories, laboratories, testing tracks, and the countless numbers in reports that haven’t been published.