Why batteries do not improve as fast as computer chips

On April 19, 1965, Gordon Moore wrote a piece for Electronics Magazine with a bold observation: component counts on a chip were doubling every year to lower manufacturing costs. As lithographer Chris Mack pointed out, that pace was never inevitable. It was an ambitious target that hardened into a self-fulfilling roadmap. People called it Moore's Law, but it was never a physical law of nature—just an aggressive economic benchmark.

That blistering speed makes modern gadgets feel strange and uneven. A listener asked why smartphones are still trapped on that stubborn single-day recharge ritual, even while running processors a hundred times faster than earlier models. We'll explore the divide between shuffling weightless electrons and wrestling with heavy physical atoms, and see how phone makers burn through battery gains before you ever notice them.

Moore later adjusted his forecast, projecting that transistor counts would double every two years instead, fueling a 300-fold surge in computing power between 1995 and 2015.

Compare that to the power cell sitting beside the processor. Over that exact stretch, lithium-ion energy density advanced roughly 5 to 8 percent each year. That steady rise quadrupled the energy stored inside the cell, yet it felt painfully slow beside runaway silicon.

It is easy to assume electrochemistry stalled out, but that is an illusion. Commercial lithium batteries reached consumers in 1991, following breakthroughs by Stanley Whittingham, John Goodenough, and Akira Yoshino. Since then, volumetric energy density—the energy stored within a specific volume—has tripled, while prices plummeted 99 percent. Battery tech never stood still. So why can't our batteries follow that same shrinking formula silicon perfected?

At its core, this is a clash between bits and atoms. Computer chips only need to shuffle weightless digital signals, but batteries have to move actual bulk matter. Chipmakers kept shrinking circuits through photolithographic scaling, using light to etch tinier switches onto silicon wafers without ever swapping silicon for a new element.

Chip designers also rode Dennard scaling. Under that principle, shrinking a transistor delivered an automatic bonus: it packed more switches into the chip while making them faster and less power-hungry, keeping heat in check as circuits multiplied.

Batteries get no easy ride like that. Journalist John Hockenberry noted that a battery is never a passive tank of loose electrons; it acts like a chemical pump. Drawing current requires chemical reactions that shuttle charged ions across an internal electrolyte, driving electrons through outside wiring to power your display.

A rechargeable cell holds its charge using intercalation. In plain words, that means tucking lithium ions directly into vacant slots inside an electrode's solid crystal framework. Picture steering cars into specific parking bays across a multi-level molecular garage.

You cannot advance a battery simply by scaling down the blueprint. Expanding a cell's physical size can deliver greater current, but output voltage is strictly locked in by the atomic properties of the materials and the chemical potential between both poles. Researcher Varun Sivaram noted that transistors rest on a physical reality where smaller switches just work better, an advantage energy storage does not share. Engineer Larry Desjardin emphasized that real leaps in batteries mean discovering completely different element pairings across the periodic chart. Code manipulates weightless bits, but energy storage is tied to the heavy, unyielding periodic table. And if you try squeezing extra energy into small enclosures by packing ions tighter, physics answers with fire.

Advocates for material limits argue that raw chemistry draws a firm boundary here. As Desjardin figured, chemical bonds store only around 1 electron-volt for each atom, which sets a theoretical ceiling near 850 watt-hours per kilogram. In commercial practice, the analytics firm Qnovo tracked standard lithium-ion recipes plateauing much sooner, stalling between 650 and 700 watt-hours per liter.

Trying to cheat that barrier by packing ions tighter invites genuine danger. When a microchip hits a bug, it simply crashes, but an unstable battery risks turning into a pocket-sized blowtorch. It triggers thermal runaway, a vicious cycle where internal heating speeds up chemical breakdown, unleashing even more heat in response. With common lithium cobalt oxide cathodes, that self-heating collapse can begin at just 190 degrees Celsius, surging at peak speeds of 440 degrees each minute.

Hardware makers learned how brutal that margin could be in August 2006. Dell issued a massive recall of 4.1 million laptop packs after tiny metallic specks touched off catastrophic fires, marking the biggest battery recall up to that point.

The surprising part is just how much this defensive armor costs. To keep those energetic materials safely boxed up, Glen Wensley, a polymer chemist, calculated that built-in safeguards consume as much as 30 percent of all cell engineering, adding up to nearly half the price tag on a finished pack.

Internal physics creates another severe hurdle known as ionic transport limits—essentially the drag that slows ions down as they squeeze through microscopic pores in the electrode. When researchers looked across published experimental data, they discovered that electrode transport rates hovered between 10⁻¹³ and 10⁻⁹ square meters per second. Because ions move that sluggishly, demanding large bursts of electrical current causes usable capacity to plummet.

Still, that prompts a natural question: do hard chemical safety limits fully explain why our phones run out of juice by evening, or are hardware designers choosing to make compromises of their own?

Blaming physical chemistry accounts for only part of the story; critics argue that the rest comes down to deliberate design choices. For decades, silicon chips obeyed an efficiency trend called Koomey's Law, tracking how much electricity calculations consume. In theory, that should have extended battery runtimes. As researcher Jonathan Koomey calculated, "at a fixed computing load, the amount of battery you need will fall by a factor of two every year and a half." Later analysis showed that doubling cadence gradually slowed, yet each calculation still became dramatically cheaper to run in electrical power.

Instead of banking those energy savings for extra battery life, hardware brands took the opposite route. Industry figures revealed that overall electrical draw across new personal computers actually rose by roughly 22 percent each year, driven by multiplying background tasks and more demanding features.

Whenever processors ran cooler, manufacturers traded that thermal headroom for thinner devices. Analyst Tim Bajarin pointed to Intel's efficient Broadwell Y processor, which sharply cut heat while boosting performance. Laptop makers never used those savings to package a larger battery; they used them to shave laptop frames down from 26 millimeters to around 7.

Bajarin observed that although dropping processor voltage can stretch runtimes, consumers continuously demand intense computing and advanced graphics. That demand collides head-on with tight hardware boundaries. During an industry talk, battery executive James Kaschmitter explained that volumetric energy density governs high-volume gadgets like cell phones. Shrinking the chassis leaves zero room to spare.

According to Tech Briefs, hardware designers also abandoned removable packs for tightly integrated enclosures. At the same time, journalist John Hockenberry pointed out that subsystems carry conflicting electrical appetites: displays, storage drives, and wireless networking chips each need distinct voltages, forcing internal circuits to constantly convert levels up or down—a parasitic conversion that bleeds off power as waste heat. Living with that single-day recharge ritual does not stem from failing electrochemistry alone; it is a conscious engineering compromise, where silicon efficiency was spent on thinner frames and richer features. Can next-generation battery chemistries finally break through that daily charging limit?

New battery architectures can nudge the ceiling upward, but they cannot rewrite physics. Solid-state designs try to boost capacity by replacing flammable liquid electrolytes with solid layers, promising denser and safer storage. In January 2026, South Korean manufacturer Samsung SDI reported reaching 880 watt-hours per liter in car qualification tests. Yet solid designs bring mechanical trouble: solid interfaces degrade, and sharp lithium dendrites can still punch through to trigger shorts.

Moving from labs to factories is slow and expensive. At Chinese battery maker CATL, manufacturing chief Ni Jun warned that large-scale commercialization is at least five years away. Chairman Robin Zeng rated solid-state maturity at stage four in development, noting that sulfide cells remain far costlier than conventional packs.

Instead of chasing exponential leaps, the industry is scaling cheaper chemistries where weight matters less. In 2026, CATL launched its utility-scale TENER Sodium system, supported by a three-year, 60-gigawatt-hour deal with integrator HyperStrong.

Even cutting-edge cells showcase the wide gap between batteries and fossil fuels. CATL demonstrated a condensed-matter cell reaching 500 watt-hours per kilogram for aviation. That is a major milestone, yet gasoline holds roughly 10 kilowatt-hours per kilogram. Liquid hydrocarbons simply store vastly more energy in their chemical bonds.

That physical divide is why batteries will never follow chips. Gordon Moore gave silicon a self-fulfilling roadmap, shrinking circuits to shuffle weightless electrons. Chemical bonds do not yield to human targets. As John Hockenberry observed, batteries "conform to technical restrictions set by nature and don’t obey Moore’s law like most of the digital world." Microprocessors rearrange digital information, but a battery has to carry the physical world, atom by atom.

If you want to understand the physical limits shaping our devices, look closer at lithium-ion batteries and follow Moore's Law. We have more stories on it, so you'll be prepared when hardware hits its next milestone. Thanks for listening. We'll catch you next time on Angle.