LG Energy Solution and SNU Tackle LMR Battery Gas

LMR battery research from LG Energy Solution and Seoul National University has identified a charging-and-discharging protocol that reduced gas generation in large 40Ah cells. The companies announced the result on September 7, after testing cells that retained 92.2% of their initial energy through 883 cycles.

What the LMR battery study changed

LMR cathodes can store charge through reactions involving transition metals and oxygen. That chemistry can provide high energy while relying more heavily on relatively inexpensive manganese. Its difficult edge is oxygen: if oxygen oxidized during charging does not return to its earlier state during discharge, the cathode can lose capacity and release gas. In a large pouch or prismatic cell, that gas can raise internal pressure.

The new result says cell stability improved when the team treated charge and discharge limits as one operating system, then redesigned the formation step used to prepare a large cell. It is an engineering result about how a chemistry is operated, not a claim that the chemistry itself has been replaced.

Reported test change	Reported outcome
Upper charge limit lowered from 4.6V to 4.3V	Oxidized-oxygen reduction rose from 86% to 97%
Lower discharge limit reduced from 3.0V to 2.0V	Oxygen recovered to nearly its original state
Voltage window and lower-temperature formation optimized	Gas generation was suppressed in 40Ah-class cells
883 charge-discharge cycles	92.2% of initial energy remained

Why the 40Ah scale matters

Many battery ideas look promising in small laboratory cells but become harder to control as cell area and internal volume grow. The announcement specifically describes 40Ah-class cells, closer to an automotive format than a coin cell. That makes gas control and uniform formation more commercially relevant, though it still does not establish pack-level safety, manufacturing yield or cost.

The test also reports energy retention, not only remaining capacity. Those measures can diverge if average operating voltage changes during cycling. Readers should therefore keep the wording precise: the optimized cells retained 92.2% of initial energy after 883 cycles under the study’s conditions.

The oxygen problem behind gas generation

Conventional lithium-ion cathodes mainly move charge through changes in a transition metal’s oxidation state. Lithium-rich manganese materials can also draw capacity from oxygen in the cathode lattice. That extra route is part of the attraction, but it introduces a difficult balancing act. Oxygen that participates reversibly can contribute energy; oxygen that escapes its intended chemical state can contribute to structural change, voltage loss and gaseous by-products.

LG Energy Solution and SNU’s reported comparison connects this chemistry to the voltage window. Charging to 4.6 volts produced an 86% reduction rate for oxidized oxygen, while lowering the upper limit to 4.3 volts raised that figure to 97%. The wording matters: the result describes the share of oxidized oxygen reduced again under the tested protocol. It does not say the cell became 97% safer, nor does it translate into a 97% reduction in every possible gas species.

The lower end of the cycle also mattered. The team reported that discharging to 2.0 volts instead of stopping at 3.0 volts helped oxygen return nearly to its original state. In practice, an operating window is never chosen from chemistry alone. Engineers must trade reversible capacity, energy efficiency, cycle life, charging time and the protective margins used by a battery-management system. The study’s value is that it identifies both ends of the window as linked controls rather than treating the charge ceiling as the only lever.

Formation is a manufacturing question, not just a lab setting

Formation is the first controlled charging and discharging sequence applied after a cell is assembled. It helps establish interfaces inside the cell and can shape later performance. In a commercial plant, formation also consumes time, floor space and energy, so any revised recipe has to work not only electrochemically but operationally. The announcement says the researchers combined the voltage-window changes with lower-temperature formation to suppress gas in 40Ah cells.

That creates several follow-up questions the announcement does not answer. A colder process may require more time, different environmental control or revised equipment scheduling. The useful comparison will be total manufacturing cost per accepted cell, including whether the recipe improves yield or merely moves cost from material choice to factory processing. None of the reviewed sources supplies a formation temperature, process duration or production-line throughput, so those variables should not be guessed.

Large cells make this validation more meaningful because heat, current density and mechanical pressure are harder to keep uniform across a broad electrode stack. They also make replication more important. A single successful batch cannot show whether coating variation, moisture exposure or assembly tolerances will produce the same gas suppression across repeated manufacturing lots.

What the evidence does not prove

No vehicle, factory ramp, customer contract or sale date was announced. A cell result cannot be converted into driving range because range depends on pack design, usable state-of-charge window, thermal management, vehicle efficiency and software buffers. Nor does a protocol automatically transfer unchanged to every LMR formulation.

The independent reports broadly match the company’s numbers and describe the work as a commercialization foundation. That phrase signals development progress. It should not be read as commercial availability. Future evidence should include repeated production lots, abuse tests, calendar aging, fast-charge performance and full-pack validation.

The evidence ladder before an EV programme

Battery development advances through layers that answer different questions. A cell-level cycle test can show that a proposed protocol retains energy under stated conditions. Repeated pilot lots test process consistency. Module tests add electrical connections, cooling paths and mechanical constraints. Pack tests add control software, crash structures and fault propagation. Vehicle validation finally combines the pack with real duty cycles and environmental exposure.

The September 7 result sits at the large-cell research layer. That is more relevant than a coin-cell experiment, but still several layers away from a production vehicle. In particular, 883 cycles cannot be converted directly into kilometres or years. The usable depth of discharge, cycle definition, temperature, charging rate and rest periods all influence ageing. Calendar ageing can also reduce performance while a vehicle is parked, even when cycle count is low.

Safety interpretation needs careful boundaries

Suppressing gas generation is relevant to stability because accumulated gas can swell a cell and alter pressure on the electrode stack. It is not a complete safety assessment. Thermal runaway behaviour, internal-short response, overcharge tolerance, crush performance and propagation between cells require separate tests. The reviewed announcement does not provide those results, so the finding should be described as gas-control and cycling evidence rather than a general safety certification.

Likewise, lowering the charge ceiling can improve chemical stability while reducing the energy accessible in a single cycle. The reported 92.2% energy retention is encouraging only when read alongside initial energy, efficiency and usable operating range, which were not fully detailed in the press material. Publication methods and supplementary data should make that trade-off easier to evaluate.

Why the economics remain interesting

LMR chemistry is attractive because manganese is cheaper and more abundant than cobalt. Yet lower material cost is only valuable if manufacturers can achieve reliable yield, long life and safe pressure behavior. A protocol that improves oxygen recovery could reduce one barrier without introducing a new cathode material, potentially making it easier to test within existing development programs.

Our coverage of EarFun’s IFA product selection shows a similar evidence boundary in consumer technology: specifications define a proposition, but repeatable testing establishes performance. Battery research requires an even stricter boundary because cell, module and pack results are different layers.

The same discipline applies to connected hardware such as Dreame’s device showcase. Demonstration, commercial product and dependable field operation are separate milestones. LG Energy Solution and SNU have announced a significant experimental milestone; production evidence comes next.

What to watch next

The most useful follow-up would be the final Nature Communications paper and its supplementary methods, followed by independent replication or additional large-cell datasets. Manufacturers will also need to show how the lower voltage limits affect usable energy, charge time, thermal behavior and economics at scale.

Commercial evidence should then arrive in a recognizable order: repeated batches with dispersion data, a disclosed formation recipe, results across temperature and charging-rate ranges, calendar ageing, abuse testing and module or pack trials. A named customer programme or factory qualification would be a later signal. Until then, the correct benchmark is whether future datasets reproduce the announced gas suppression without sacrificing too much accessible energy or manufacturing throughput.

For now, the defensible conclusion is narrow: the team found that coordinating voltage limits and formation conditions can suppress gas generation and support long cycling in 40Ah LMR cells. It moves a known technical problem forward without declaring the chemistry production-ready.

FAQs

What is an LMR battery?

It uses a lithium-manganese-rich cathode that relies heavily on manganese and can store energy through both metal and oxygen reactions.

Did the test prove an EV battery is ready for sale?

No. It was a large-cell research result; pack qualification, manufacturing validation and a commercial launch were not announced.

What did 92.2% refer to?

LG Energy Solution said optimized 40Ah-class cells retained 92.2% of their initial energy after 883 charge-discharge cycles.