August battery-grade lithium sulfide production analysis: Will Q4 see a surge? [SMM Analysis]

SMM, September 2:

Key points: In August 2026, China's lithium sulfide production was 7.8 mt, up 3.6% MoM and up 143% YoY. Will lithium sulfide production surge in Q4? Judging from downstream demand, this is currently unlikely, but a mild volume expansion will continue. Average monthly production is expected to reach the 9-10 mt range, edging up QoQ from Q3 rather than jumping explosively.

1. January-August review: China has come to dominate global supply
China's cumulative production from January to August was 52.9 mt, up 184% YoY, exceeding the full-year 2025 total (34 mt). Domestic capacity release has entered a phase of substantial delivery. Outside China, production over the same period was only 3.0 mt, down 39% YoY. Enterprises in Japan and South Korea, constrained by equipment commissioning and insufficient downstream orders, are essentially in a state of "having capacity but no production." Of the global total of 55.9 mt, China accounted for 95%.
The key question is: Does China's 52.9 mt of production reflect "how much can be produced" or "how much demand requires"? The answer leans toward the latter—current output is driven more by downstream stocking pace than by capacity bottlenecks. Many producers are stockpiling in advance for improved demand in Q4.
2. Q3 performance: Ramp-up continues, but the slope is slowing
August data: China produced 7.79 mt, up 3.6% MoM and up 143% YoY. The MoM growth rate has narrowed from double digits in Q2 to single digits, signaling that the steepest phase of the capacity ramp-up has passed. What follows is a mild production increase rather than an explosive surge in volume.
September expectations: China's production is expected at 8.0-8.5 mt, with a midpoint of 8.3 mt, setting a new high for the year. Three factors support this: ① stable operation of major facilities; ② rigid stockpiling demand from downstream solid-state battery clients at the end of Q3; ③ new capacity from Xiba, Hanpu, Wanbang, and others still in the low-load release phase. But the ceiling is equally clear—downstream battery cell clients have not yet entered a large-scale procurement cycle, so there is no basis for a jump in operating rates.
Outside China, production remained at a low of 0.3 mt, essentially negligible.
3. Q4 outlook: No expectation of a surge
Q4 average monthly production is expected to land in the 9-10 mt range, up about 15-25% QoQ from Q3 (about 8 mt/month). This is a mild volume expansion, not a surge.
3.1 Factors supporting the uptrend:
First, new capacity release : The Sichuan all-solid-state production line is expected to be delayed in commissioning. Xiba and Hanpu's hundred-tonne-scale lines continue to ramp up, and Wanbang & salt lake facilities still have room to increase production. These are all "invested but not yet full" sources of existing flexibility.
Second, downstream stocking-driven demand: Q4 is traditionally a peak stocking season for battery materials enterprises. Coupled with accelerated pilot-line progress at some solid-state battery clients, demand is expected to improve QoQ.
3.2 Factors constraining a surge:
Orders are the hard constraint: Solid-state batteries are still on the eve of commercialisation, and the sulphide electrolyte procurement volumes of leading battery cell enterprises are far from reaching the "ramp-up" stage. Without terminal orders, lithium sulphide production lines will not run at full capacity—this is not a capacity issue but an economic one.
No reliance on overseas markets: Japanese and South Korean companies will remain focused on equipment commissioning and small-batch validation in Q4, meaning global supply growth can only come from China.
Quantitative assessment: Q4 average monthly production will most likely land in the 9-10 mt range, with December potentially reaching 10-11 mt (depending on the commissioning pace of Sichuan's all-solid-state project), but full-year total production is expected to be in the 85-95 mt range, representing 2.5-2.8x growth from the 2025 base of 34 mt.
IV. Core contradiction: capacity is not the bottleneck, orders are
The real state of the lithium sulphide market is this: existing capacity in China far exceeds actual production, and actual production in turn depends on the procurement pace of downstream solid-state battery clients.
The only core variable to watch in Q4: whether electrolyte procurement volumes at leading domestic solid-state battery enterprises show a substantive MoM jump. If the answer is "yes," Q4 monthly averages could push towards 10-11 mt; if the answer is "no," 9-10 mt remains the reasonable midpoint.
V. One-sentence summary
Q4 will not see a blowout, but will maintain a pace of modest month-by-month increases. The full-year total of 85-95 mt already fully validates supply-side capability. The real "blowout" will have to wait for downstream solid-state battery installation volumes to ramp up—that is at least a post-2027 story.
Risk warning: If Q4 downstream stocking willingness falls short of expectations (especially if pilot-scale progress at solid-state battery clients is delayed), domestic enterprises may proactively reduce operating rates, and monthly production could face downside risk to around 8 mt.
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