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Heat generation and a conservation law for chemical energy in Li-ion batteries

Heat generation and a conservation law for chemical energy in Li-ion batteries
Heat generation and a conservation law for chemical energy in Li-ion batteries
Present theories of irreversible energy losses and heat generation within Li-ion cells are unsatisfactory because they are not compatible with energy conservation and typ- ically give rise to significant errors in the estimation of these quantities. This work aims to provide a consistent theoretical treatment of energy transport and losses in such devices. An energy conservation law is derived from the Doyle-Fuller-Newman (DFN) model of a Li-ion cell using a rigorous mathematical approach. The resulting law allows irreversible chemical energy losses to be located to seven different regions of the cell, namely: (i) the electrolyte, (ii) the anode particles, (iii) the cathode parti- cles, (iv) the solid parts of the anode (ohmic losses), (v) the solid parts of the cathode (ohmic losses), (vi) the surfaces of the anode particles (polarisation losses), and (vii) the surfaces of the cathode particles (polarisation losses). Numerical solutions to the DFN model are used to validate the conservation law in the cases of a drive cycle and constant current discharges, and to compare the energy losses occurring in different lo- cations. It is indicated how cell design can be improved, for a specified set of operating conditions, by comparing the magnitude of energy losses in the different regions of the cell.
Energy conservation Law, Heat production, Li-ion battery, Newman model, P2D model
0013-4686
Richardson, Giles
3fd8e08f-e615-42bb-a1ff-3346c5847b91
Korotkin, Ivan
1ca96363-075e-41d9-a0c1-153c8c0cc31a
Richardson, Giles
3fd8e08f-e615-42bb-a1ff-3346c5847b91
Korotkin, Ivan
1ca96363-075e-41d9-a0c1-153c8c0cc31a

Richardson, Giles and Korotkin, Ivan (2021) Heat generation and a conservation law for chemical energy in Li-ion batteries. Electrochimica Acta, 392, [138909]. (In Press)

Record type: Article

Abstract

Present theories of irreversible energy losses and heat generation within Li-ion cells are unsatisfactory because they are not compatible with energy conservation and typ- ically give rise to significant errors in the estimation of these quantities. This work aims to provide a consistent theoretical treatment of energy transport and losses in such devices. An energy conservation law is derived from the Doyle-Fuller-Newman (DFN) model of a Li-ion cell using a rigorous mathematical approach. The resulting law allows irreversible chemical energy losses to be located to seven different regions of the cell, namely: (i) the electrolyte, (ii) the anode particles, (iii) the cathode parti- cles, (iv) the solid parts of the anode (ohmic losses), (v) the solid parts of the cathode (ohmic losses), (vi) the surfaces of the anode particles (polarisation losses), and (vii) the surfaces of the cathode particles (polarisation losses). Numerical solutions to the DFN model are used to validate the conservation law in the cases of a drive cycle and constant current discharges, and to compare the energy losses occurring in different lo- cations. It is indicated how cell design can be improved, for a specified set of operating conditions, by comparing the magnitude of energy losses in the different regions of the cell.

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More information

Accepted/In Press date: 8 July 2021
Keywords: Energy conservation Law, Heat production, Li-ion battery, Newman model, P2D model

Identifiers

Local EPrints ID: 450409
URI: http://eprints.soton.ac.uk/id/eprint/450409
ISSN: 0013-4686
PURE UUID: 2e12a759-d455-4284-ac46-65a2be784f20
ORCID for Ivan Korotkin: ORCID iD orcid.org/0000-0002-5023-3684

Catalogue record

Date deposited: 27 Jul 2021 17:24
Last modified: 26 Nov 2021 03:17

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