{"id":298146,"date":"2026-02-23T13:10:20","date_gmt":"2026-02-23T13:10:20","guid":{"rendered":"https:\/\/www.newsbeep.com\/nz\/298146\/"},"modified":"2026-02-23T13:10:20","modified_gmt":"2026-02-23T13:10:20","slug":"what-is-a-solid-state-battery-and-why-is-everyone-so-excited-about-them","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/nz\/298146\/","title":{"rendered":"What is a solid-state battery \u2013 and why is everyone so excited about them?"},"content":{"rendered":"

If you\u2019ve followed the development of electric cars<\/a> at all, you\u2019ve heard the phrase \u201csolid-state battery<\/a>\u201d.<\/p>\n

For years, carmakers and tech companies have promised that this next-generation technology is just around the corner, bringing ultra-fast charging, longer range and a step-change in safety. Toyota<\/a>, Nissan<\/a>, BYD<\/a>, Mercedes-Benz<\/a> and BMW<\/a> have all talked it up as the next big leap for electric cars.<\/p>\n

\"\"
\nBYD has announced it will begin production of solid-state batteries in 2027.<\/p>\n

But what actually is a solid-state battery? And how is it different from what\u2019s in today\u2019s EVs?\u00a0Here\u2019s the plain-English version.<\/p>\n


\n Read More
\n <\/p>\n

First: how current EV batteries work<\/p>\n

Most electric cars today use lithium-ion batteries – broadly similar in chemistry to the one in your phone<\/a> or laptop, just much larger.<\/p>\n


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<\/p>\n

\"\"
\nBMW began testing solid-state batteries in the i7 on public roads early last year.<\/p>\n

Inside a typical lithium-ion battery are three key parts:<\/p>\n

An anode (negative side)
\nA cathode (positive side)
\nAn electrolyte (the material that lets charged particles move between them)<\/p>\n

When the battery powers the car, lithium ions move from the anode to the cathode through the electrolyte. When you plug in to charge, they move back again. That constant back-and-forth is what stores and releases energy.<\/p>\n

\"\"
\nSolid-state batteries have the potential to be small, lighter and safer than current EV batteries.<\/p>\n

The crucial component here is the electrolyte. In almost all current EV batteries, it\u2019s a liquid (or gel-like) chemical solution. It lets ions to flow easily – but it comes with trade-offs:<\/p>\n

It\u2019s flammable.
\nIt limits the use of higher-energy materials, capping energy density.
\nIt degrades over time.
\nIt requires careful cooling and monitoring.<\/p>\n


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<\/p>\n

Modern EV batteries are extremely safe in real-world use, but they depend on sophisticated battery management systems to keep everything stable.<\/p>\n

\"\"
\nLate last year Mercedes-Benz completed a marathon 1205km trip on a single charge in an EQS using solid-state batteries.<\/p>\n

So what is a solid-state battery?<\/p>\n

At a basic level, it\u2019s the same concept – anode, cathode and electrolyte – but with one critical difference: the electrolyte is solid, not liquid.<\/p>\n

Instead of a liquid solution, solid-state batteries use solid materials such as ceramics, glass-like compounds or specialised polymers to allow lithium ions to move between the electrodes.<\/p>\n

One change. Potentially big consequences.<\/p>\n

\"\"
\nMG already has cars, including a variant of the MG4, on sale in China that use “semi-solid-state” batteries.<\/p>\n

Why does that matter?<\/p>\n

Swapping the liquid electrolyte alters several key characteristics. The biggest promise is higher energy density – more energy stored in the same size and weight.<\/p>\n

Because solid electrolytes are generally more stable, they can potentially enable the use of a lithium metal anode instead of the graphite used in most current batteries. Lithium metal can store significantly more energy, opening the door to longer range, lighter battery packs, or even both.<\/p>\n

In theory, an EV that travels 500km today could manage 700 to 1000km at similar weight, or deliver the same range with less mass to lug around.<\/p>\n

There\u2019s also the promise of faster charging. Liquid electrolytes have limits on how quickly lithium ions can move safely. Push too hard and you risk overheating or forming tiny needle-like structures called dendrites, which can damage the battery.<\/p>\n

Under laboratory conditions, solid electrolytes have shown they can reduce dendrite formation and tolerate higher charging rates. That could mean substantially faster charging – in some tests approaching 10 to 15 minutes for a major top-up that might take 30 to 40 minutes in a current EV.<\/p>\n

Safety is another potential advantage. Liquid electrolytes are flammable, and while EV battery fires are rare, they can be severe. Removing the flammable liquid reduces the risk of thermal runaway, the chain reaction that can lead to battery fires and makes them difficult to extinguish. That doesn\u2019t make solid-state batteries fireproof, but they are widely expected to be inherently safer.<\/p>\n

There\u2019s also durability, as solid-state batteries are, in theory, more stable and may degrade more slowly than current lithium-ion packs.<\/p>\n

Battery degradation happens for several reasons: chemical breakdown, heat, repeated charging cycles and structural changes inside the cell. Early research suggests solid-state designs could reduce some of these degradation mechanisms, although they introduce new material and interface challenges that researchers are still working through.<\/p>\n

If those hurdles are solved, it could mean longer warranties, stronger resale values and less range loss over time.<\/p>\n

\"\"
\nThe biggest road block for solid-state batteries is the cost and complexity of building them, but that is improving at a very rapid rate.<\/p>\n

If they\u2019re so good, where are they?<\/p>\n

Because building them is hard. And expensive.<\/p>\n

Producing ultra-thin, defect-free solid electrolyte layers at automotive scale is significantly more difficult than manufacturing conventional liquid-based cells. Even tiny cracks or imperfections can hurt performance.<\/p>\n

Cost is another barrier. New materials, new production processes and low initial volumes make solid-state batteries expensive. Until they can be produced in the millions at competitive prices, they won\u2019t replace today\u2019s lithium-ion packs.<\/p>\n

And lab results aren\u2019t enough. Automotive batteries must survive extreme heat and cold, vibration, repeated fast charging and thousands of cycles over 10 to 15 years. Proving that kind of durability takes time.<\/p>\n

\"\"
\nToyota’s road map for solid-state batteries aims for a 2027\/2028 introduction of the tech.<\/p>\n

So are they coming soon?<\/p>\n

Carmakers have been saying \u201cfive years away\u201d for more than a decade. But progress is genuine.<\/p>\n

Toyota has said it aims to commercialise solid-state batteries later this decade, while BYD says it will start solid-state production in 2027, with mass market sales by 2030. Nissan has similar ambitions, while BMW is working with specialist partners and expects test vehicles before full production.<\/p>\n

More likely than an overnight revolution is a gradual rollout – perhaps in limited-production or premium models first, before filtering down to mainstream vehicles.<\/p>\n

Meanwhile, conventional lithium-ion batteries aren\u2019t standing still. They\u2019re getting cheaper, denser and faster-charging every year.<\/p>\n

\"\"
\nProducing ultra-thin, defect-free solid electrolyte layers is significantly more difficult than manufacturing conventional liquid-based cells.<\/p>\n

The bottom line<\/p>\n

A solid-state battery isn\u2019t a radical reinvention. It\u2019s an evolution of the lithium-ion concept, swapping a liquid electrolyte for a solid one.<\/p>\n

That single change could eventually deliver more range, faster charging, improved safety and longer lifespan. But turning promising lab results into affordable, mass-produced automotive batteries remains one of the toughest engineering challenges in the industry.<\/p>\n

Today\u2019s EV batteries are already very good, and improving quickly. Solid-state technology may well be the next big step, but it won\u2019t arrive like a light switch. It\u2019ll be another steady step in how we power our cars.<\/p>\n","protected":false},"excerpt":{"rendered":"If you\u2019ve followed the development of electric cars at all, you\u2019ve heard the phrase \u201csolid-state battery\u201d. For years,…\n","protected":false},"author":2,"featured_media":298147,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[1665,6190,138,164162,2308,164167,111,139,69,164163,370,145,164165,164164,164168,164166],"class_list":{"0":"post-298146","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-business","8":"tag-advice","9":"tag-bev","10":"tag-business","11":"tag-car-advice","12":"tag-ev-batteries","13":"tag-how-long-until-we-get-solid-state-batteries","14":"tag-new-zealand","15":"tag-newzealand","16":"tag-nz","17":"tag-solid-state-ev-batteries","18":"tag-tech","19":"tag-technology","20":"tag-what-are-solid-state-ev-batteries","21":"tag-what-is-a-solid-state-battery","22":"tag-what-is-the-difference-between-a-solid-state-battery-and-a-normal-ev-battery","23":"tag-when-will-solid-state-batteries-be-in-evs"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/298146","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/comments?post=298146"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/298146\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media\/298147"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media?parent=298146"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/categories?post=298146"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/tags?post=298146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}