Three materials advances target batteries and solar cells

Three studies test materials ideas, not finished products

These three recent studies explore different ways to improve energy materials. One models how lithium-ion batteries lose capacity with age. Another tests coatings intended to protect a solid electrolyte from moisture. The third changes the surface chemistry of a perovskite solar-cell material ¹²³.

The reports are preprints. That means other scientists have not yet checked them through peer review. Each study offers evidence for a particular model or material under the conditions tested, not a settled answer about how long a battery will last or how a solar panel will perform in ordinary use. One study rarely settles a research question.

A battery-aging model captures trends across several test conditions

The first team wanted to predict a common source of lithium-ion battery aging: growth of a thin layer called the solid-electrolyte interphase, or SEI, at the graphite anode. The SEI forms during battery operation, and its continued growth is associated with capacity loss. The researchers built a physics-based computer model in which electron movement helps set the rate of growth ¹.

They compared the model with existing experimental aging data from lithium iron phosphate (LFP) and graphite cells. The data covered different electrolyte salts, graphite types, temperatures from 40 to 70°C, cycling rates from C/20 to 1C, and restricted charge ranges. The team reports that one set of model parameters captured degradation trends across these varied conditions without recalibration ¹.

The model also suggests that operating at a lower state of charge can reduce degradation. However, the authors report that it overestimates capacity loss during periods of storage at high charge. This is a computer model checked against cell-aging data, not a new consumer-battery trial. It does not show how much longer a phone, car, or home battery would last in real use. If the model holds up in further testing, it could help researchers compare operating conditions and predict aging more consistently ¹.

A thin coating helps shield a solid electrolyte from moisture

The second study asked how molecular coatings might protect a sulfide solid electrolyte called Li₆PS₅Cl, or LPSCl. These materials are being explored for all-solid-state batteries, but moisture and chemical instability can be obstacles. The researchers combined large-scale atom-level computer simulations with laboratory experiments, including impedance spectroscopy, a way to assess how readily ions move through a material ².

The simulations compared several types of acid-derived coatings and different chain lengths. The researchers found that long-chain lithiated carboxylates formed water-repelling layers that reduced water access to reactive surface sites. In tests, longer carboxylate chains also suppressed hydrogen sulfide (H₂S) production more effectively. The report places the onset of protection at a coating thickness of about 0.8 nanometres. But thicker coatings can also hinder lithium-ion movement. After powder processing, the lithiated coatings retained 40–55% of the material’s initial ionic conductivity ².

This work combines simulations and experiments on a specific electrolyte and coating approach. It does not show that a full battery made with the coating will be durable, safe, or ready for manufacturing. The trade-off matters: a protective layer is useful only if it does not block ion flow too much. The findings may help guide further coating research, but performance in a working battery remains to be established ².

Surface treatment raises efficiency in a tin-lead solar cell

The third team studied tin-lead perovskites, a class of materials used in experimental solar cells. It focused on surface defects that can waste energy by allowing excited electrons and holes to recombine before their energy is collected. The researchers compared how two related chemical treatments interact with tin-rich surfaces, using experiments and atomistic simulations ³.

They report that neutral ethylenediamine changes the surface composition and electronic character, helping electrons move into a neighbouring C60 layer while reducing non-radiative recombination. The resulting methylammonium-free cell reached a reported power conversion efficiency of 25.86%. That figure describes how efficiently the tested cell converted light into electrical power; it is not a measure of how long the cell lasts ³.

This is a laboratory material and device study, not evidence that commercial panels will reach the same efficiency in everyday conditions. The report does not establish long-term stability, performance at large manufacturing scale, or results across independent laboratories. It suggests that controlling surface chemistry could be one route to better-performing tin-lead perovskite cells, while leaving practical durability and production questions open ³.

The results point to useful research directions, not readiness

Together, the studies show how researchers are addressing losses at different points: battery aging, electrolyte exposure to moisture, and energy lost at a solar-cell surface ¹²³. They offer a model that may help explain battery degradation, a coating strategy with a measurable conductivity trade-off, and a solar-cell efficiency result from a particular material treatment.

They do not establish that any of these approaches is ready for products or will improve performance in everyday conditions. The work needs further checking, including independent replication and tests in complete devices over relevant operating conditions. For now, these are research advances that help define what to test next, rather than promises about longer-lasting batteries or more efficient panels.