Planar Li deposition and dissolution enable practical anode-free pouch cells
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Article Date: 17 March 2026
Article URL: https://www.nature.com/articles/s41586-026-10402-0
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Summary
This Nature paper reports a major advance for anode-free lithium metal batteries (AFLMBs). The authors design a crossover-coupled electrolyte that induces interfacial chemistry producing a B–F-based polymer-rich solid electrolyte interphase (SEI) on the anode and suppresses gas evolution at the cathode. The SEI is sub-nanometre homogenous, highly flexible and ion-transport-friendly, forming a self-adaptive mesh-film that enables uniform, planar Li deposition and dissolution at high areal capacity (5.6 mAh cm–2). Using this approach the team builds a 2.7 Ah pouch cell achieving about 508 Wh kg–1 (1668 Wh L–1), with practical cycling performance: 100 cycles at 100% depth of discharge and 250 cycles at 80% DoD with ~80% capacity retention, and high-power output (2650 W kg–1 at 96 Wh kg–1). The work addresses structural instabilities of host-free electrodes and points to practical AFLMBs for high-energy applications.
Key Points
- A crossover-coupled electrolyte triggers favourable interfacial reactions that form a B–F-based polymer-rich SEI on the anode while suppressing cathode gas evolution.
- The engineered SEI shows sub-nanometre homogeneity, high flexibility and rapid Li-ion transport, enabling uniform ion flux across the anode.
- A self-adaptive mesh-film SEI accommodates large volume changes and ensures reversible planar Li deposition/dissolution at 5.6 mAh cm–2.
- A 2.7 Ah anode-free pouch cell demonstrates 508 Wh kg–1 (1668 Wh L–1), with 100 cycles at 100% DoD and 250 cycles at 80% DoD retaining ~80% capacity.
- The cell delivers high power (2650 W kg–1 at 96 Wh kg–1), showing the approach balances energy and power effectively.
- The study establishes crossover-coupled interphase chemistry as a route to overcome the mechanical fragility and heterogeneity of SEI in host-free Li systems, moving AFLMBs closer to practical use.
Content summary
The authors identify uneven Li deposition and dissolution in AFLMBs as driven by SEI micro-heterogeneity and mechanical fragility. They design an electrolyte that couples species crossover with interfacial reactions to form a B–F polymer-rich SEI layer. This SEI is thin, homogeneous and flexible, and it evolves into a mesh-like film that equalises ion flux and tolerates large volume changes during plating/stripping. Experimental cells built without any anode host coating show stable planar Li cycling at high areal capacity and produce a 2.7 Ah pouch cell with industry-relevant energy and power metrics. The manuscript includes characterisation of the SEI, electrochemical testing, and demonstration of lifecycle and performance metrics that argue for practical anode-free cell design.
Context and relevance
Why this matters: anode-free cells promise higher energy density and lower cost by removing the anode active material, but have been held back by short lifetimes and unstable Li behaviour. This work provides a chemistry-driven solution to SEI instability — rather than relying on bulky hosts or coatings — and shows metrics (≈508 Wh kg–1, multi-hundred-cycle life at high DoD) that approach application needs for transport and grid-edge energy storage. For researchers and engineers working on next-generation Li batteries, this is a credible step towards practical, host-free designs and may influence electrolyte formulation and interphase engineering strategies across the field.
Author style
Punchy: the paper doesn’t just tweak existing recipes — it defines a new interphase chemistry route that directly tackles the main failure mode of anode-free cells. If you’re tracking technologies that could change battery pack design and cost structure, read the details.
Why should I read this?
Short version: if you care about whether anode-free lithium batteries can leave the lab bench and work in real packs, this paper is the one to skim — and then read properly if you design cells or electrolytes. It shows a chemistry-led fix that yields high energy, decent cycle life and strong power, without adding a bulky anode host. Saved you time: big claim, backed by pouch-cell data.