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Chinese researchers achieve 700 Wh/kg lithium battery using fluorinated hydrocarbon electrolyte

Chinese researchers achieve 700 Wh/kg lithium battery using fluorinated hydrocarbon electrolyte

New Capabilities

A new electrolyte chemistry roughly doubles commercial battery energy density and works at extreme cold, with direct backing from China's space program

March 23rd, 2026: International media coverage expands

Overview

The best commercial lithium batteries today store about 250 to 300 watt-hours per kilogram. A team from Nankai University and the Shanghai Academy of Spaceflight Technology — which builds China's rockets and space station modules — has published results in Nature. The new fluorinated hydrocarbon electrolyte pushes lithium metal batteries to 700 Wh/kg at room temperature and nearly 400 Wh/kg at minus 50 degrees Celsius.

If the chemistry survives from lab to production, it would roughly double electric vehicle range, extend drone flight times, and enable battery-powered operation in Arctic and space where current cells lose most of their capacity. The involvement of China's primary space contractor signals near-term aerospace applications, while China already controls nearly 70 percent of global electric vehicle battery production.

Why it matters

Doubling battery energy density would extend electric vehicle range, enable longer flights for electric aircraft and drones, and make battery-powered systems feasible in extreme cold and space — including military uses.

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Key Indicators

700 Wh/kg
Energy density at room temperature
Roughly 2.5 times the energy density of the best commercial lithium-ion cells available today
~400 Wh/kg
Energy density at -50°C
The cold-temperature figure alone exceeds today's best room-temperature commercial cells
250–300 Wh/kg
Current commercial lithium-ion energy density
The baseline the breakthrough is measured against, representing today's best NMC chemistry cells
~69%
China's share of global EV battery production
China already dominates the battery supply chain from raw material refining through cell manufacturing

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People Involved

Chen Jun
Chen Jun
Co-corresponding author on the Nature paper
 Zhao Qing
Zhao Qing
Co-corresponding author on the Nature paper
 Li Yong
Li Yong
Co-author on the Nature paper

Organizations Involved

Nankai University
Nankai University
Research University
Primary research institution behind the breakthrough

One of China's most prestigious research universities, with a chemistry department ranked in the global top 0.01 percent by Essential Science Indicators and seventh in Asia Pacific by the Nature Index.
SA
Shanghai Academy of Spaceflight Technology (SAST)
State Aerospace Institution
Co-developer of the electrolyte; potential near-term customer for space applications

A subsidiary of China Aerospace Science and Technology Corporation (the main contractor for China's entire space program), SAST builds the Long March rocket family and developed every module of the Tiangong space station.
Contemporary Amperex Technology Co. Limited (CATL)
Contemporary Amperex Technology Co. Limited (CATL)
Battery Manufacturer
World's largest battery maker; pursuing its own next-generation battery technologies

The world's largest electric vehicle battery manufacturer with 38 percent global market share, CATL is simultaneously developing condensed-state and solid-state batteries targeting over 500 Wh/kg.

Timeline

January 2024 March 2026

8 events Latest: March 23rd, 2026 · 4 months ago
Tap a bar to jump to that date

  1. International media coverage expands

    Latest Coverage

    People's Daily English edition, Xinhua, and Interesting Engineering publish detailed coverage, bringing the breakthrough to wider international attention and prompting analysis of implications for the global battery race.

  2. Nankai University issues official announcement

    Institutional

    Nankai University publishes a detailed summary of the research, highlighting the novel fluorine-lithium coordination mechanism and the team's use of practical pouch cell formats.

  3. Chinese state media highlights the breakthrough

    Coverage

    China Daily, Xinhua, and other state outlets report the findings, emphasizing the potential to double electric vehicle range and the extreme-cold performance.

  4. Nature publishes 700 Wh/kg fluorinated electrolyte paper

    Research

    Researchers from Nankai University and the Shanghai Academy of Spaceflight Technology publish their findings on monofluorinated hydrocarbon electrolytes in Nature, demonstrating 700 Wh/kg at room temperature in practical pouch-type cells.

  5. China reaches 69% of global EV battery market

    Market

    Industry data shows Chinese companies control 68.9 percent of global electric vehicle battery installations through October 2025, with CATL and BYD accounting for 55 percent alone.

  6. CATL activates solid-state battery pilot line

    Industry

    CATL begins operating a 5-gigawatt-hour solid-state battery pilot production line in Hefei, China, using sulfide electrolyte technology. Lab samples exceed 500 Wh/kg.

  7. Amprius ships 450 Wh/kg silicon anode cells commercially

    Industry

    American firm Amprius Technologies begins commercial shipments of 450 Wh/kg batteries to aviation and defense customers, tripling revenue to 73 million dollars. It announces a 500 Wh/kg platform in development.

  8. Global battery race intensifies

    Context

    Multiple countries and companies accelerate next-generation battery research. Toyota, Samsung, CATL, and BYD all announce solid-state battery timelines targeting 2026 to 2028.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

1970s–1991

Lithium-ion commercialization (1991)

John Goodenough, Stanley Whittingham, and Akira Yoshino developed the foundational chemistry for lithium-ion batteries across the 1970s and 1980s. The concept moved between American universities and Japanese corporations for over a decade before Sony commercialized the first lithium-ion cell in 1991, powering a handheld camcorder.

Then

Sony gained an early market advantage. The battery enabled a generation of portable electronics that could not have existed with nickel-cadmium chemistry.

Now

Lithium-ion became the dominant energy storage technology, enabling smartphones, laptops, and eventually electric vehicles. The three researchers won the 2019 Nobel Prize in Chemistry. The roughly 20-year gap from discovery to commercialization became the reference timeline for battery breakthroughs.

Why this matters now

The lithium-ion story illustrates both the transformative potential and the long timelines of battery breakthroughs. The Nankai team's use of practical pouch cells rather than coin cells suggests they are actively trying to shorten this gap, but the fundamental challenge of moving from lab chemistry to mass manufacturing remains.

2009–present

Lithium-sulfur battery development stall (2009–present)

Lithium-sulfur batteries theoretically offer up to 2,600 Wh/kg — nearly four times what the Nankai team achieved — and researchers have published thousands of papers showing promising lab results. Major corporate and government programs invested billions in the technology. A breakthrough paper in 2009 attracted intense interest and funding.

Then

Venture capital flowed into lithium-sulfur startups. Several companies announced ambitious commercialization timelines.

Now

After more than 15 years of development, no lithium-sulfur battery has reached mass production. The polysulfide shuttle effect — where reaction products dissolve into the electrolyte and degrade the battery — has proven stubbornly resistant to engineering solutions. The gap between coin-cell results and practical pouch cells remains enormous.

Why this matters now

Lithium-sulfur is the cautionary tale for any battery energy density claim. The Nankai team's results are more modest in their theoretical ceiling but were demonstrated in practical pouch cells, which is further along the development path than many lithium-sulfur results. Still, the history warns against assuming any lab breakthrough will reach production.

2000s–2020s

Japan's loss of battery manufacturing dominance (2000s–2020s)

Japan invented and first commercialized lithium-ion batteries through Sony and Panasonic, dominating the industry through the 2000s. China entered the market aggressively with massive state investment in raw material processing, cell manufacturing, and supply chain integration. By the mid-2020s, Chinese companies controlled nearly 70 percent of global EV battery production while Japanese manufacturers held single-digit market shares.

Then

Japanese companies maintained technology leads in certain areas, particularly solid-state battery research, but lost volume manufacturing dominance.

Now

The shift demonstrated that controlling the full supply chain — from lithium and cobalt refining through cell manufacturing — matters as much as initial research breakthroughs. Japan now bets on solid-state technology as its path back to competitiveness.

Why this matters now

This history shows that inventing a battery chemistry and commercially dominating it are different achievements. China's control of battery manufacturing infrastructure means a Chinese-origin breakthrough like the fluorinated electrolyte has a shorter path to production than a comparable discovery made elsewhere — the factories, supply chains, and skilled workforce are already in place.

Sources

(11)
+5
People's Daily Xinhua Interesting Engineering Nature Nankai University CarNewsChina China Daily TechXplore South China Morning Post Carbon Credits Carnegie Endowment for International Peace