雅思阅读 16: The Solid-State Battery Make-or-Break Moment（固态电池的生死关头）

改编自 Scientific American（2026年8月）。雅思阅读 Section 3 难度，约 1050 词。 素材来源：https://www.scientificamerican.com/article/can-quantumscape-and-factorial-energy-mass-produce-solid-state-batteries/

Reading Passage

A. For fifteen years, Tim Holme has watched the same drama repeat itself roughly once a week: a laboratory somewhere announces a breakthrough in solid-state batteries, and a headline declares the battery of the future to have arrived. "Approximately zero of those have come true," says Holme, chief technology officer of QuantumScape, a San José company that has spent the same period pursuing what remains the most promised and least delivered technology in energy storage. The most recent cautionary tale was Donut Lab, a Finnish start-up that announced a high-performance solid-state cell without releasing supporting data — until independent researchers showed its product was ordinary lithium-ion with liquid electrolyte inside. Yet amid the skepticism, the race is genuinely accelerating: Toyota promises production within two years; Chinese firms already ship semi-solid cells; and two American front-runners are pursuing rival manufacturing paths. Solid-state batteries have been a laboratory curiosity for decades, yet the gap between a working demonstration and a shippable product has repeatedly swallowed companies and the capital behind them. What makes the current moment different, many engineers argue, is not a single new discovery but a convergence: better ceramics, cleaner manufacturing and a car market desperate for longer range have arrived at the same time.

B. The term "solid state" describes an architecture rather than a single chemistry. Conventional lithium-ion batteries shuttle lithium ions through a flammable liquid electrolyte between a graphite anode and a metal-oxide cathode. A solid-state battery replaces most or all of that liquid with a solid conductor — typically a ceramic, sulfide, polymer or combination — which in principle enables a pure lithium-metal anode that stores far more energy. The practical benefits are compelling: higher energy density, faster charging, longer range, and elimination of the fire risk that has plagued liquid-electrolyte packs. In practice, however, most "solid-state" batteries on the market still contain some liquid, usually in the cathode region, and the term itself has become partly a marketing label. "There are people introducing terms like 'quasi-solid state,' 'hybrid solid state,' 'condensed state,'" Holme says, "all kinds of terms that are never defined." The distinction matters because a cell that still uses a little liquid is far easier to build with today's tools, while a fully solid cell promises the pure lithium-metal anode that roughly doubles range. Investors and regulators increasingly want an agreed definition before they commit large sums, yet no universally accepted one exists.

C. QuantumScape and Factorial Energy, the two American leaders, have taken opposite approaches. QuantumScape, backed by Volkswagen, builds a ceramic electrolyte that allows an "anode-free" design in which the lithium-metal anode forms on the first charge. The ceramic is hard and brittle but offers the best material properties; the company has developed a proprietary heat-treatment process, "Cobra," that bakes the electrolyte in minutes rather than hours. Factorial, led by founder Siyu Huang, uses a polymer electrolyte designed to run on roughly 80 percent of existing lithium-ion manufacturing equipment — a bet that compatibility with current factories matters more than peak performance. The two companies claim energy densities of 301 and 391 watt-hours per kilogram respectively, figures that would quiet electric-vehicle range anxiety if they survive mass production. Both firms acknowledge that laboratory figures are measured on small, carefully made cells; the jump to electrodes rolled out kilometres at a time in a factory routinely lowers energy density and shortens cycle life. Which approach scales is precisely what the next two years will determine.

D. The fundamental scientific challenge remains the interface. Moving ions through a solid is inherently harder than through a liquid; the boundary between the solid electrolyte and the electrodes is where dendrites — tiny branching filaments of lithium — can grow through the separator and cause short circuits. Void left behind as lithium strips from the electrode creates gaps that expand and contract with every charge cycle, requiring external mechanical pressure that can itself crack the brittle electrolyte. Since January 2025, at least fourteen Western battery start-ups have collapsed trying to scale beyond pilot production. "There is now a significant deviation between what's possible and where the technology really is," remarks battery researcher Jeff Sakamoto, who uses microscopy to watch defects accumulate in operating cells. The interface problem is stubborn because it is not solved by a single material. A ceramic that conducts ions well may crack under pressure; a polymer that flexes may slow the ions; coatings that protect one surface may corrode another. Engineers have spent years trading one weakness for another rather than eliminating the underlying trade-off.

E. The commercial stakes extend far beyond cars. With cooling EV demand in the United States and Chinese firms dominating 80 percent of global lithium-ion production, both companies are eyeing drones, aviation and military applications — markets where safety and energy density matter more than cost. The Pentagon now aims to produce thousands of US-made drones per month, yet over 80 percent of drone batteries were imported from China as of last year. Huang calls advanced battery manufacturing "an asset we cannot afford to lose." Estimates for when solid-state batteries reach mainstream electric vehicles range from the early 2030s to never. Most experts agree, however, that solid state is no longer a question of whether — but of who survives the leap from laboratory to gigafactory. For the companies involved, the prize is not merely a product but a foothold in a supply chain that governments now treat as strategic. Whichever route proves manufacturable first will set the standard that rivals must meet, and may help define the industrial map of electric transport for a generation. The doubters who have seen a hundred false dawns are not wrong to wait; but the quiet collapse of so many rivals suggests that, this time, fewer are able to afford waiting.

Questions 1-4

Choose the correct heading for paragraphs B, C, D and E from the list of headings below.

List of Headings i. Why "solid state" is harder to define than it seems ii. Two rival American strategies for building the cells iii. How lithium-ion batteries were invented iv. The stubborn interface problem and the cost of failure v. Markets beyond cars and the race to scale vi. The history of Chinese battery manufacturing vii. Why solid-state batteries always catch fire

1. Paragraph B: ____
2. Paragraph C: ____
3. Paragraph D: ____
4. Paragraph E: ____

Questions 5-8

Choose the correct letter, A, B, C or D.

5. What happened with Donut Lab? A. It became the first company to produce true solid-state cells. B. Its product was shown to be conventional lithium-ion with liquid inside. C. It was acquired by Toyota. D. It released extensive supporting data.

6. What is the key advantage of a solid electrolyte? A. It is cheaper to manufacture than liquid. B. It enables a lithium-metal anode and removes flammable liquid. C. It eliminates the need for charging. D. It works at lower temperatures than graphite.

7. How do QuantumScape and Factorial differ? A. QuantumScape uses polymers; Factorial uses ceramics. B. QuantumScape designs for new manufacturing; Factorial adapts existing lines. C. QuantumScape focuses on drones; Factorial focuses on cars. D. QuantumScape is Chinese; Factorial is American.

8. Why are drones and military markets attractive? A. They require cheaper batteries than cars. B. Safety and energy density matter more than upfront cost. C. They use less energy than electric vehicles. D. They are not subject to export restrictions.

Questions 9-13

Do the following statements agree with the claims of the writer?

Write:

• TRUE if the statement agrees with the information
• FALSE if the statement contradicts the information
• NOT GIVEN if there is no information on this

9. QuantumScape has spent about five years developing solid-state batteries.
10. Most commercially available "solid-state" batteries contain some liquid.
11. At least fourteen Western battery start-ups have failed since January 2025.
12. Solid-state batteries are currently cheaper than lithium-ion.
13. Toyota has already begun mass production of solid-state cars.

Questions 14-15

Complete the summary below using NO MORE THAN TWO WORDS from the passage.

The hardest problem in solid-state battery design is the (14) __________ between the solid electrolyte and the electrodes, where dendrites can grow and cause (15) __________.

答案与解析

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