Described from: literature
Parameter Set · published 2026-11-02
LFP|graphite 2 Ah cylindrical 18650 cell. Parameterisation by About:Energy Limited (aboutenergy.io), December 2022, based on cell cycling data, and electrode data gathered after cell teardown. Electrolyte properties from Nyman et al. 2008 (doi:10.1016/j.electacta.2008.04.023). Negative electrode entropic coefficient data are from O'Regan et al. 2022 (doi:10.1016/j.electacta.2022.140700). Positive electrode entropic coefficient data are from Gerver and Meyers 2011 (doi:10.1149/1.3591799). Other thermal properties are estimated.
https://w3id.org/battinfo/dataset/h7g7-5082-63jk-9wm3Taken from the BPX parameter set Parameterisation example of an LFP|graphite 2 Ah cylindrical 18650 cell., written for a DFN model (BPX 0.1.0). Source: github.com/FaradayInstitution/BPX. Curated by Simon Clark.
Parameterisation by About:Energy Limited (December 2022), distributed as an example with the BPX standard (FaradayInstitution/BPX, MIT licence) at commit 9b73d69.
| Parameter | Value | Unit |
|---|---|---|
| Reference temperature | 298.15 | K |
| Lower voltage cut-off | 2 | V |
| Upper voltage cut-off | 3.65 | V |
| Nominal cell capacity | 2 | Ah |
| Specific heat capacity | 999 | J/(kg·K) |
| Thermal conductivity | 1.89 | W/(m·K) |
| True density | 1940 | kg/m³ |
| Electrode area, one electrode pair | 0.0896 | m² |
| Number of electrode pairs | 1 | |
| External surface area | 0.00431 | m² |
| Cell volume | 1.7 × 10⁻⁵ | m³ |
| Parameter | Negative electrodeGraphite | Positive electrodeLFP | Unit |
|---|---|---|---|
| Particle radius | 4.8 × 10⁻⁶fitted | 5 × 10⁻⁷fitted | m |
| Solid-phase diffusivity | 9.6 × 10⁻¹⁵fitted | 6.873 × 10⁻¹⁷fitted | m²/s |
| Open-circuit potential | 5.29210878e+01 * exp(-1.72699386e+02 * x) - 1.17963399e+03 + 1.20956356e+03 * tanh(6.72033948e+01 * (x + 2.44746396e-02)) + 4.52430314e-02 * tanh(-1.47542326e+01 * (x - 1.62746053e-01)) + 2.01855800e+01 * tanh(-2.46666302e+01 * (x - 1.12986136e+00)) + 2.01708039e-02 * tanh(-1.19900231e+01 * (x - 5.49773440e-01)) + 4.99616805e+01 * tanh(-6.11370883e+01 * (x + 4.69382558e-03))of xfitted | 3.41285712e+00 - 1.49721852e-02 * x + 3.54866018e+14 * exp(-3.95729493e+02 * x) - 1.45998465e+00 * exp(-1.10108622e+02 * (1 - x))of xfitted | |
| Entropic change coefficient | (-0.1112 * x + 0.02914 + 0.3561 * exp(-((x - 0.08309) ** 2) / 0.004616)) / 1000of xfitted | 21-point curve V/Kagainst stoichiometryfitted | |
| Reaction rate constant | 6.872 × 10⁻⁶fitted | 9.736 × 10⁻⁷fitted | mol·m⁻²·s⁻¹ |
| Minimum stoichiometry | 0.0016261fitted | 0.0875fitted | |
| Maximum stoichiometry | 0.82258fitted | 0.95038fitted | |
| Maximum lithium concentration | 31400fitted | 21200fitted | mol/m³ |
| Diffusivity activation energy | 30000fitted | 80000fitted | J/mol |
| Reaction rate constant activation energy | 55000fitted | 35000fitted | J/mol |
| Parameter | Negative electrode | Positive electrode | Unit |
|---|---|---|---|
| Layer thickness | 4.44 × 10⁻⁵fitted | 6.43 × 10⁻⁵fitted | m |
| Electronic conductivity | 7.46fitted | 0.8fitted | S/m |
| Surface area per unit volume | 473004fitted | 4.4185 × 10⁶fitted | m⁻¹ |
| Porosity | 0.20666fitted | 0.20359fitted | |
| Transport efficiency | 0.09395fitted | 0.09186fitted |
| Parameter | Value | Unit |
|---|---|---|
| Layer thickness | 2 × 10⁻⁵fitted | m |
| Porosity | 0.47fitted | |
| Transport efficiency | 0.3222fitted |
| Parameter | Value | Unit |
|---|---|---|
| Cation transference number | 0.259fitted | |
| Ionic conductivity | 0.1297 * (x / 1000) ** 3 - 2.51 * (x / 1000) ** 1.5 + 3.329 * (x / 1000)of xfitted | |
| Electrolyte diffusivity | 8.794e-11 * (x / 1000) ** 2 - 3.972e-10 * (x / 1000) + 4.862e-10of xfitted | |
| Conductivity activation energy | 17100fitted | J/mol |
| Diffusivity activation energy | 17100fitted | J/mol |
| Parameter | Value | Unit |
|---|---|---|
| Initial temperature | 298.15 | K |
| Initial salt concentration | 1000 | mol/m³ |
| Ambient temperature | 298.15 | K |
Values are rounded to five significant figures. Hover a value for the number as stated, or download the file for the full set.
PyBaMM 26.10.1.1, DFN, 25 °C. No measured data in the file.
Loading the profiles through the cell…
# pip install "pybamm[bpx]==26.10.1.1"
import json
import urllib.request
import pybamm
iri = "https://w3id.org/battinfo/dataset/h7g7-5082-63jk-9wm3"
# ?format=bpx redirects to the BPX file; the file host refuses Python's default User-Agent.
request = urllib.request.Request(iri + "?format=bpx", headers={"User-Agent": "bpx-example"})
params = pybamm.ParameterValues.create_from_bpx_obj(json.loads(urllib.request.urlopen(request).read()))
experiment = pybamm.Experiment(["Discharge at 2 A until 2 V"])
solution = pybamm.Simulation(pybamm.lithium_ion.DFN(), parameter_values=params, experiment=experiment).solve()
print(solution["Discharge capacity [A.h]"].entries[-1], "A h")| # | Role | Record | Identifier | Type |
|---|---|---|---|---|
| 01 | Parameter set | This record | h7g7-5082-63jk-9wm3 | parameter set |
https://github.com/FaradayInstitution/BPX. Described in Battery Genome as BPX LFP 18650, https://w3id.org/battinfo/dataset/h7g7-5082-63jk-9wm3.
Contributors · Simon Clark