# How electrodes store lithium

> How battery electrodes store lithium, on one page: intercalation into a layered host, alloying with silicon that swells and cracks, conversion of a metal oxide into metal nanoparticles in Li₂O, the solvation sheath round Li⁺, the SEI on graphite and the electrolyte window between LUMO and HOMO. Every caption and number is quoted from the cited papers.

- Page: https://www.labcanvas.com/templates/energy-storage-guides/how-electrodes-store-lithium
- Open in the LabCanvas editor (LabCanvas account): https://www.labcanvas.com/editor.html?template=battery-storage-mechanisms
- Updated: 2026-10-14
- Category: Battery & energy storage guides
- Method: Storage mechanisms
- Product: Intercalation, alloying and conversion electrodes, the Li⁺ solvation sheath, the SEI on graphite and the electrolyte stability window
- Key result: Mechanisms drawn by LabCanvas after the cited papers; atoms, molecules, layer thicknesses and energy levels are drawn, not to scale, and no panel is a micrograph or measured data
- Figure: 1920 × 1080 px, 45 editable layers (6 generated objects with settings)

## Steps

1. **Intercalation**: A cathode host framework takes the mobile (working) cation in and out reversibly over a finite solid-solution range (Goodenough 2013)
2. **Alloying**: Silicon has the highest known theoretical charge capacity, 4,200 mAh g⁻¹, over ten times that of graphite, but its volume changes by 400% as lithium goes in and out, which pulverizes it; silicon nanowires take the strain without pulverizing and reached the theoretical capacity, keeping close to 75% of it (Chan 2008). In Si, Ge and Sn anodes the expansion cracks the particles and the SEI then grows uncontrollably (Cao 2019); in a yolk–shell electrode a designed void lets each particle expand inside its carbon shell, so the SEI on the shell stays stable: about 2800 mAh/g at C/10 and 74% after 1000 cycles (Liu 2012)
3. **Conversion**: Nanoparticles of transition-metal oxides MO (M = Co, Ni, Cu or Fe) store 700 mA h g⁻¹: Li₂O forms as the oxide is reduced to metal nanoparticles of 1–5 nm, and both reverse on charge, with 100% capacity retention for up to 100 cycles (Poizot 2000). Conversion electrodes can reach gravimetric capacities two to five times those of graphite and LiCoO₂ (Cabana 2010)
4. **The solvation sheath**: Li⁺ in aprotic solvents is typically four- or fivefold coordinated, so in dilute 1 : 10.8 LiFSA/DMC (1.0 mol dm⁻³) most DMC molecules are free. High-dielectric-constant EC promotes salt dissociation and low-viscosity DMC raises ion mobility, which is why conventional electrolytes mix EC with linear carbonates (Wang 2016)
5. **The SEI on graphite**: An electrode beyond the electrolyte window needs a passivating layer that lets Li⁺ through and keeps up with the electrode’s changing area; forming it on the anode takes lithium from the cathode irreversibly on the first charge (Goodenough 2013). Simulations give a uniform LiF layer like the SEI’s inorganic inner layer under a polymer-rich organic outer layer (Yu 2022); every route to lithium ethylene monocarbonate needs water, which limits it compared with the dicarbonate, LEDC (Xie 2021); a coated expanded-graphite anode kept an SEI rich in LiF and Li₂CO₃ (Wang 2025)
6. **The electrolyte window**: The energy difference between the electrolyte’s LUMO and HOMO, its window, sets the maximum voltage for a long shelf and cycle life. Electrode potentials outside it raise the voltage only if a passivating layer forms that lets Li⁺ through, adding impedance; with an aqueous electrolyte the maximum stable voltage is 1.5 V, and Li-ion cells use an organic electrolyte with a larger window (Goodenough 2013). The SEI comes from the electrolyte decomposing outside its thermodynamic stability window (Cao 2019)

## Strengths

- Silicon nanowires take the strain without pulverizing (Chan 2008)
- Conversion electrodes reach two to five times the gravimetric capacity of graphite and LiCoO₂ (Cabana 2010)
- An organic electrolyte’s larger window raises the energy a cell stores (Goodenough 2013)

## Limitations

- Silicon’s 400% volume change pulverizes it (Chan 2008)
- Forming the SEI takes lithium irreversibly on the first charge (Goodenough 2013)
- After cracking, the SEI on Si, Ge and Sn grows uncontrollably (Cao 2019)

## References

1. Goodenough & Park, “The Li-ion rechargeable battery: a perspective”, J. Am. Chem. Soc. 2013. https://doi.org/10.1021/ja3091438 (primary)
2. Chan et al., “High-performance lithium battery anodes using silicon nanowires”, Nat. Nanotechnol. 2008. https://doi.org/10.1038/nnano.2007.411 (primary)
3. Liu et al., “A yolk-shell design for stabilized and scalable Li-ion battery alloy anodes”, Nano Lett. 2012. https://doi.org/10.1021/nl3014814 (primary)
4. Cao et al., “Shedding X-ray light on the interfacial electrochemistry of silicon anodes for Li-ion batteries”, Acc. Chem. Res. 2019. https://doi.org/10.1021/acs.accounts.9b00233 (primary)
5. Poizot et al., “Nano-sized transition-metal oxides as negative-electrode materials for lithium-ion batteries”, Nature 2000. https://doi.org/10.1038/35035045 (primary)
6. Cabana et al., “Beyond intercalation-based Li-ion batteries: the state of the art and challenges of electrode materials reacting through conversion reactions”, Adv. Mater. 2010. https://doi.org/10.1002/adma.201000717 (primary)
7. Wang et al., “Superconcentrated electrolytes for a high-voltage lithium-ion battery”, Nat. Commun. 2016. https://doi.org/10.1038/ncomms12032 (primary)
8. Yu et al., “Multiscale simulation of solid electrolyte interface formation in fluorinated diluted electrolytes with lithium anodes”, ACS Appl. Mater. Interfaces 2022. https://doi.org/10.1021/acsami.1c22610 (primary)
9. Xie et al., “Data-driven prediction of formation mechanisms of lithium ethylene monocarbonate with an automated reaction network”, J. Am. Chem. Soc. 2021. https://doi.org/10.1021/jacs.1c05807 (primary)
10. Wang et al., “N/S co-doped carbon-coated micro-expanded graphite for high-performance lithium-ion battery anodes”, Materials 2025. https://doi.org/10.3390/ma18112477 (primary)

Credit: Drawn by LabCanvas after Goodenough & Park, J. Am. Chem. Soc. 2013 (doi:10.1021/ja3091438), Chan et al., Nat. Nanotechnol. 2008, Poizot et al., Nature 2000, Cao et al., Acc. Chem. Res. 2019 and Wang et al., Nat. Commun. 2016, and the papers in the details.

## Questions

**What does the “How electrodes store lithium” template show?** How battery electrodes store lithium, on one page: intercalation into a layered host, alloying with silicon that swells and cracks, conversion of a metal oxide into metal nanoparticles in Li₂O, the solvation sheath round Li⁺, the SEI on graphite and the electrolyte window between LUMO and HOMO. Every caption and number is quoted from the cited papers.

**What are the steps shown in “How electrodes store lithium”?** 1. Intercalation: A cathode host framework takes the mobile (working) cation in and out reversibly over a finite solid-solution range (Goodenough 2013). 2. Alloying: Silicon has the highest known theoretical charge capacity, 4,200 mAh g⁻¹, over ten times that of graphite, but its volume changes by 400% as lithium goes in and out, which pulverizes it; silicon nanowires take the strain without pulverizing and reached the theoretical capacity, keeping close to 75% of it (Chan 2008). In Si, Ge and Sn anodes the expansion cracks the particles and the SEI then grows uncontrollably (Cao 2019); in a yolk–shell electrode a designed void lets each particle expand inside its carbon shell, so the SEI on the shell stays stable: about 2800 mAh/g at C/10 and 74% after 1000 cycles (Liu 2012). 3. Conversion: Nanoparticles of transition-metal oxides MO (M = Co, Ni, Cu or Fe) store 700 mA h g⁻¹: Li₂O forms as the oxide is reduced to metal nanoparticles of 1–5 nm, and both reverse on charge, with 100% capacity retention for up to 100 cycles (Poizot 2000). Conversion electrodes can reach gravimetric capacities two to five times those of graphite and LiCoO₂ (Cabana 2010). 4. The solvation sheath: Li⁺ in aprotic solvents is typically four- or fivefold coordinated, so in dilute 1 : 10.8 LiFSA/DMC (1.0 mol dm⁻³) most DMC molecules are free. High-dielectric-constant EC promotes salt dissociation and low-viscosity DMC raises ion mobility, which is why conventional electrolytes mix EC with linear carbonates (Wang 2016). 5. The SEI on graphite: An electrode beyond the electrolyte window needs a passivating layer that lets Li⁺ through and keeps up with the electrode’s changing area; forming it on the anode takes lithium from the cathode irreversibly on the first charge (Goodenough 2013). Simulations give a uniform LiF layer like the SEI’s inorganic inner layer under a polymer-rich organic outer layer (Yu 2022); every route to lithium ethylene monocarbonate needs water, which limits it compared with the dicarbonate, LEDC (Xie 2021); a coated expanded-graphite anode kept an SEI rich in LiF and Li₂CO₃ (Wang 2025). 6. The electrolyte window: The energy difference between the electrolyte’s LUMO and HOMO, its window, sets the maximum voltage for a long shelf and cycle life. Electrode potentials outside it raise the voltage only if a passivating layer forms that lets Li⁺ through, adding impedance; with an aqueous electrolyte the maximum stable voltage is 1.5 V, and Li-ion cells use an organic electrolyte with a larger window (Goodenough 2013). The SEI comes from the electrolyte decomposing outside its thermodynamic stability window (Cao 2019).

**Which papers is “How electrodes store lithium” based on?** Goodenough & Park, “The Li-ion rechargeable battery: a perspective”, J. Am. Chem. Soc. 2013 (doi:10.1021/ja3091438); Chan et al., “High-performance lithium battery anodes using silicon nanowires”, Nat. Nanotechnol. 2008 (doi:10.1038/nnano.2007.411); Liu et al., “A yolk-shell design for stabilized and scalable Li-ion battery alloy anodes”, Nano Lett. 2012 (doi:10.1021/nl3014814); Cao et al., “Shedding X-ray light on the interfacial electrochemistry of silicon anodes for Li-ion batteries”, Acc. Chem. Res. 2019 (doi:10.1021/acs.accounts.9b00233); Poizot et al., “Nano-sized transition-metal oxides as negative-electrode materials for lithium-ion batteries”, Nature 2000 (doi:10.1038/35035045); Cabana et al., “Beyond intercalation-based Li-ion batteries: the state of the art and challenges of electrode materials reacting through conversion reactions”, Adv. Mater. 2010 (doi:10.1002/adma.201000717); Wang et al., “Superconcentrated electrolytes for a high-voltage lithium-ion battery”, Nat. Commun. 2016 (doi:10.1038/ncomms12032); Yu et al., “Multiscale simulation of solid electrolyte interface formation in fluorinated diluted electrolytes with lithium anodes”, ACS Appl. Mater. Interfaces 2022 (doi:10.1021/acsami.1c22610); Xie et al., “Data-driven prediction of formation mechanisms of lithium ethylene monocarbonate with an automated reaction network”, J. Am. Chem. Soc. 2021 (doi:10.1021/jacs.1c05807); Wang et al., “N/S co-doped carbon-coated micro-expanded graphite for high-performance lithium-ion battery anodes”, Materials 2025 (doi:10.3390/ma18112477).

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