Pseudocapacitive oxide materials for high-rate electrochemical energy storage

Veronica Augustyn (1) , Patrice Simon (2, 3) , Bruce Dunn (1)

1 UCLA - University of California [Los Angeles]
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 RS2E - Réseau sur le stockage électrochimique de l'énergie

Electrochemical energy storage technology is based on devices capable of exhibiting high energy density (batteries) or high power density (electrochemical capacitors). There is a growing need, for current and near-future applications, where both high energy and high power densities are required in the same material. Pseudocapacitance, a faradaic process involving surface or near surface redox reactions, offers a means of achieving high energy density at high charge–discharge rates. Here, we focus on the pseudocapacitive properties of transition metal oxides. First, we introduce pseudocapacitance and describe its electrochemical features. Then, we review the most relevant pseudocapacitive materials in aqueous and non-aqueous electrolytes. The major challenges for pseudocapacitive materials along with a future outlook are detailed at the end.

Mots clés: Pseudocapacitive oxide materials; High-rate electrochemical energy storage

Domaines: Matériaux; Energie électrique

Veronica Augustyn, Patrice Simon, Bruce Dunn. Pseudocapacitive oxide materials for high-rate electrochemical energy storage. Energy & Environmental Science, 2014, vol. 7 (n° 5), pp. 1597-1614. ⟨10.1039/c3ee44164d⟩. ⟨hal-01171774⟩