Nanosilicon-Based Thick Negative Composite Electrodes for Lithium Batteries with Graphene as Conductive Additive

Binh Phuong Nhan Nguyen (1) , Nanjundan Ashok Kumar (2) , Joël Gaubicher (1, 3) , Florence Duclairoir (2) , Thierry Brousse (1, 3) , Olivier Crosnier (1) , Lionel Dubois (2) , Gerard Bidan (2) , Dominique Guyomard (1, 3) , Bernard Lestriez (1, 3)

1 IMN - Institut des Matériaux Jean Rouxel
2 SCIB - UMR E3 - Service de Chimie Inorganique et Biologique
3 RS2E - Réseau sur le stockage électrochimique de l'énergie

Reduced graphene oxide (rGO) is used as a conductive additive for nanosilicon-based lithium battery anodes with the high active-mass loading typically required for industrial applications. In contrast to conventional Si electrodes that use acetylene black (AcB) as an additive, the rGO system shows pronounced improvement of electrochemical performance, irrespective of the cycling conditions. With capacity limitation, the rGO system results in improved coulombic efficiency (99.9%) and longer cycle life than conventional electrodes. Upon cycling without capacity limitation, much higher discharge capacity is maintained (2000 mAh g−1 after 100 cycles for 2.5 mg of Si cm−2). Used in conjunction with the bridging carboxymethyl cellulose binder, the crumpled and resilient rGO allows highly reversible functioning of the electrode in which the Si particles repeatedly inflate and deflate upon alloying and dealloying with lithium.

Mots clés: anodes; cycle performance; graphene additives; lithium-ion batteries; nanosilicon

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Binh Phuong Nhan Nguyen, Nanjundan Ashok Kumar, Joël Gaubicher, Florence Duclairoir, Thierry Brousse, et al.. Nanosilicon-Based Thick Negative Composite Electrodes for Lithium Batteries with Graphene as Conductive Additive. Advanced Energy Materials, 2013, 3 (10), pp.1351. ⟨10.1002/aenm.201300330⟩. ⟨hal-00980323⟩