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Within this work, we propose a new generalised quintom dark energy model inthe teleparallel alternative of general relativity theory, by considering anon-minimal coupling between the scalar fields of a quintom model with thescalar torsion component $T$ and the boundary term $B$. In the teleparallelalternative of general relativity theory, the boundary term represents thedivergence of the torsion vector, $B=2\nabla_{\mu}T^{\mu}$, and is related tothe Ricci scalar $R$ and the torsion scalar $T$, by the fundamental relation:$R=-T+B$. We have investigated the dynamical properties of the present quintomscenario in the teleparallel alternative of general relativity theory byperforming a dynamical system analysis in the case of decomposable exponentialpotentials. The study analysed the structure of the phase space, revealing thefundamental dynamical effects of the scalar torsion and boundary couplings inthe case of a more general quintom scenario. Additionally, a numerical approachto the model is presented to analyse the cosmological evolution of the system.

Generalised teleparallel quintom dark energy non-minimally coupled with the scalar torsion and a boundary term