CATL restarts Jianxiawo. The Chinese lithium floor comes back just as hyperscaler BESS scales.

The Jiangxi lepidolite mine restarted June 29 with a 100,000-tonne carbonate nameplate. Jefferies says hyperscalers add 20 GW of battery storage by 2035, and calls Chinese LFP the most compelling option. Sigma and SQM are the ones absorbing the pressure.

China’s CATL secured a safety production permit for its flagship Jianxiawo lithium mine in Yichun, Jiangxi on June 29, 2026, and the mine resumed production the same evening after a shutdown that had lasted almost a year (MINING.COM/Reuters, July 7, 2026; CnEVPost, July 1, 2026). The permit runs to February 27, 2028. The restart lands right as Jefferies is telling clients hyperscalers represent a 20 GW battery storage opportunity through 2035, with the most compelling supplier being Chinese LFP (Latitude Media, November 3, 2025). The Chinese floor under lithium is back, and it is back on a demand curve that data centers are pulling up.

What’s happening

CATL obtained the Jianxiawo safety production permit on June 29, 2026, effective until February 27, 2028, and the mine officially resumed production on the evening of June 29 (MINING.COM/Reuters, July 7, 2026; CnEVPost, July 1, 2026).
The mine and its associated on-site refinery have an annual lithium carbonate capacity of about 100,000 tonnes and accounted for 8 to 10 percent of China’s lithium carbonate output before the suspension (CnEVPost, July 1, 2026; electrive.com, July 1, 2026). Reuters, citing Australian government data, put the mine’s contribution at about 46,000 tonnes of lithium carbonate, roughly 3 percent of 2025 global output (MINING.COM/Reuters, July 7, 2026).
Mysteel analyst Li Pan estimates the mine will add more than 45,000 tonnes of incremental lithium carbonate in the second half of 2026 assuming an official restart from July, and expects Chinese lithium carbonate prices to trade in a 150,000 to 200,000 yuan per tonne range over that period (CnEVPost, July 1, 2026).
Chinese lithium carbonate futures reacted to the confirmed restart with the main contract closing at 163,360 yuan per tonne (about US$24,075) on June 30, up 8.36 percent on the day, as the market priced a supply shock that was smaller than some had feared but a demand read that came in above expectations (CnEVPost, July 1, 2026).
CATL had suspended Jianxiawo on August 10, 2025 after a key mining permit expired August 9, 2025, a decision analysts read as part of Beijing’s effort to ease pressure on an overheated market (electrive.com, July 1, 2026).

Brazil angle

The pressure lands directly on Sigma Lithium at Grota do Cirilo in Minas Gerais. Sigma currently has nameplate capacity to produce 270,000 tonnes of lithium oxide concentrate annually (approximately 38,000 to 40,000 tonnes of LCE) at its Greentech Industrial Plant, with a second plant under construction to double that capacity (Sigma Lithium press release via Yahoo Finance/Newsfile, February 13, 2026). Sigma’s February 13, 2026 disclosure priced its sale of 150,000 tonnes of high-purity lithium fines at US$140 per tonne on warehouse delivery at the port of Vitória, with a buyer option for an additional 350,000 tonnes at market prices, alongside a US$96 million production-backed revolver against 70,500 tonnes of high-grade concentrate to be supplied through 2026 (same release). The revolver pricing tracks spot for the high-grade tonnes. That “spot” is now a spot with Jianxiawo’s 100,000-tonne carbonate line inside it again. CATL’s restart lands the marginal-cost Chinese tonne back under the price a Brazilian producer can capture at exactly the moment Sigma is trying to double physical volume into the market. This is not new geography for Sigma. It is a fresh Chinese ceiling on the price at which the new tonnes clear.

US angle

The Jefferies note that Latitude Media quoted last November said the plain thing out loud. Data centers will optimize for quality and price, “making Chinese LFP BESS the most compelling option” for demand response and capacity backup, with two to four hour lithium-ion the preferred duration, though Tesla and Fluence “stand to benefit as well” (Latitude Media, November 3, 2025). Aligned Data Centers announced a first the week the note landed: a 31-megawatt, 62-megawatt-hour battery paired with a Pacific Northwest data center to compress interconnection timelines, planned operational in 2026, developed by Calibrant Energy in partnership with the local utility (Latitude Media, November 3, 2025). Jefferies’ broader read: hyperscalers are a 20 GW BESS opportunity by 2035 and roughly 9 GW by 2030 (Latitude Media, November 3, 2025). Google’s Hallie Cramer Carrao told the DERVOS conference audience that batteries “haven’t been part of” the company’s solutions so far but likely will be, and that Google’s “strong preference” is bridge-to-interconnection front-of-meter deployment (Latitude Media, November 3, 2025). U.S. onshore lithium projects and separated LFP cell manufacturing will need policy scaffolding beyond IRA 45X if they are going to compete on price against a market where the marginal Chinese tonne has just come back on line.

China angle

Beijing’s satisfaction with the restart is itself the signal. Chinese authorities refused to renew CATL’s license in August 2025 as part of an intervention to ease pressure on an overheated lithium market. Approval of the safety permit is being read as an indication that the government now judges the price environment stabilized (electrive.com, July 1, 2026). CATL retains 40.1 percent global power battery share for the January to April 2026 period per SNE Research (CnEVPost, July 1, 2026). Vertical integration matters. The Jiangxi site mines lepidolite, crushes and concentrates it on the pit, and processes it into battery-grade lithium carbonate at a co-located refinery that feeds CATL’s own LFP and NMC cathode production. That integration is the reason a Chinese-set price floor also caps ex-China producer margins: CATL is not only supplier, it is also the customer.

What it means

For the AI materials thesis, this is a supply-side reset that keeps a Chinese-priced lithium input at the center of the data center BESS scale-up. The physics is neutral. The market-structure question is not. Every additional gigawatt of hyperscaler battery storage between now and 2030 will be priced against the marginal Chinese carbonate tonne. Diversification producers in the SDX universe (Sigma in Brazil, SQM and Arcadium in the Lithium Triangle, Pilbara in Australia) will still get share of the volume, but the price at which they clear will be set in Yichun and Ganfeng-adjacent regional benchmarks. The IRA production credit and the DPA Title III grant regime are the only tools currently sized to bridge that gap on U.S. soil.

What to watch

Q3 2026 Chinese lithium carbonate futures behavior against the 150,000 to 200,000 yuan per tonne band Mysteel called (CnEVPost, July 1, 2026). If the low end holds, the restart normalized supply and the demand read is real. If it breaks through the low, hyperscaler BESS demand has not yet arrived at scale.
Sigma Lithium Q3 2026 sales versus production. Q2 2025 already showed a 28,000 tonne gap accumulating. A repeat quarter with a Chinese floor now capped means inventory carries into 2027.
The next hyperscaler BESS deal that gets announced with a supplier name attached. Aligned Data Centers with Calibrant Energy in November 2025 was the template. The counterparty on the next deal, LFP source and cell origin, will show whether Jefferies’ “Chinese LFP” call remains the base case as U.S. and European domestic capacity ramps.

Tantalum Strategy