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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsGeneral Motors and LG Energy Solution plan to make lithium manganese-rich (LMR) prismatic battery cells at their Ultium Cells plant in Spring Hill, Tennessee. GM says the cells are designed to deliver 33% greater energy density than lithium iron phosphate (LFP) cells at comparable cost. That is GM’s chemistry comparison—not a promise of 33% more driving range or a verified result from a production vehicle.
What GM announced for Spring Hill
In a September 29, 2026 announcement, GM said its Ultium Cells joint venture with LG Energy Solution plans to produce LMR prismatic cells at the Spring Hill facility. GM expects the project to make Ultium Cells the first manufacturer globally to commercially produce the technology; Tennessee’s economic development agency described it as the first planned mass production of prismatic LMR cells. Those first-in-the-world descriptions come from GM and the state, rather than an independent audit.
The Tennessee Department of Economic and Community Development put the additional investment at $1 billion. GM says construction and facility upgrades are due to begin later in 2026 and are expected to finish in 2028. The company projects 500 new jobs, on top of the 1,200 employees it says the facility currently has. These are announced plans and projections, not completed work or realized hiring.
What “33% more energy density” means
Energy density describes how much energy a battery cell stores relative to its size or weight. GM’s claim is that its LMR cells are designed for 33% greater energy density than LFP at comparable cost. In its May 2025 announcement, GM framed the benchmark as the best-performing LFP-based cells. The comparison is a company claim; the sources do not establish an independently verified, like-for-like production-cell result.
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Higher cell energy density does not translate automatically into the same percentage increase in vehicle range. Range also depends on the battery pack’s design and usable capacity, the vehicle’s efficiency, and other factors. GM has not supplied a production vehicle specification for the planned Spring Hill cells. In 2025, it described more than 400 miles of range as a target for an electric truck using LMR; that was a target, not a released vehicle specification.
What LMR is—and why it is prismatic
Lithium manganese-rich describes the chemistry
LMR means lithium manganese-rich and refers to the cell’s cathode chemistry. GM describes its approach as using more manganese, which it characterizes as cheaper and more abundant than nickel or cobalt, with virtually no cobalt. GM’s technical explainer gives an approximate composition of 65% manganese and 35% nickel for its LMR cells; that is the company’s description of its design, not an independent materials analysis.
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Prismatic describes the cell’s shape
A prismatic cell sits in a rigid, flat rectangular enclosure. Cell shape is separate from chemistry: LMR identifies the materials approach, while prismatic identifies the form factor. GM says prismatic cells can reduce complexity at the pack level, estimating 75% fewer battery module components and 50% fewer total pack components. Those are GM’s figures, not measured outcomes from the planned Spring Hill production.
Which GM vehicles are intended to use LMR?
When GM and LG Energy Solution announced their LMR commercialization plan in May 2025, they said the technology was intended for future electric trucks and full-size SUVs. GM said it aimed to be the first automaker to deploy LMR in EVs. The announcements do not name a production model or give a final vehicle battery specification, so the chemistry’s announced applications should not be mistaken for a confirmed model launch.
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GM presents LMR as a middle option in its battery portfolio: high-nickel cells for its highest-range applications, LFP as a lower-cost chemistry, and LMR as a planned combination of greater energy density than LFP with comparable cost. That is GM’s portfolio framing, not an independently verified comparison of equivalent packs or finished vehicles.
How mature is the technology?
GM and LG Energy Solution announced the LMR commercialization plan in May 2025. At that time, GM expected pre-production at an LG Energy Solution facility by late 2027 and planned U.S. commercial production by 2028. The September 2026 announcement identifies Spring Hill as the planned U.S. production location; it does not mean commercial production has already begun.
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GM’s 2025 engineering account describes work on about one ton of LMR cathode material, hundreds of large-format prismatic prototype cells, 18 prototype varieties and three cell dimensions. GM also said its testing was equivalent to 1.4 million miles of EV driving. These are figures from the company’s own development account, not independent validation of production-cell durability. GM says earlier LMR efforts faced short lifespan and voltage attenuation—loss of voltage over time—and that it used dopants, coatings, particle engineering and process changes to address those issues. The cited sources do not provide independent durability results for production cells.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Spring Hill’s LFP plan is separate
GM announced in July 2025 that Spring Hill would be upgraded to scale LFP cell production, with commercial production expected by late 2027. The LMR announcement came later, in September 2026, and concerns a different chemistry. The two plans share a factory location; the earlier LFP announcement is not evidence that LMR cells were already being produced there.
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Sources
- General Motors, “Ultium Cells to bring LMR prismatic battery cell production to Tennessee for future GM EVs,” September 29, 2026.
- Tennessee Department of Economic and Community Development, “Ultium Cells to Invest Additional $1 Billion in Spring Hill,” September 29, 2026.
- General Motors, “GM and LG Energy Solution to pioneer LMR battery cell technology,” May 13, 2025.
- Kushal Narayanaswamy, General Motors, “Why LMR batteries will change the outlook for the EV market,” May 13, 2025.
- General Motors, “Ultium Cells to upgrade Tennessee plant for low-cost EV battery cell production,” July 14, 2025.
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