You can try to define the determinant of an $n \times n$ matrix with entries in a bipermutative (or symmetric bimonoidal) category $R$ by an analogue of the usual signed sum of $n$-fold products. However, it will usually not be a monoidal functor, and the inclusion $BGL_1(R) \to K(R)$ does generally not admit a retraction, which you might expect to get from a determinant. There is a counterexample in

• Ausoni, Christian (D-BONN); Dundas, Bjørn Ian (N-BERG); Rognes, John (N-OSLO) Divisibility of the Dirac magnetic monopole as a two-vector bundle over the three-sphere. Doc. Math. 13 (2008), 795–801.

and a discussion of what more might be needed (to circumvent this obstruction) in

• Kragh, Thomas (S-UPPS) Orientations on 2-vector bundles and determinant gerbes. Math. Scand. 113 (2013), no. 1, 63–82.

You can try to define the determinant of an $n \times n$ matrix with entries in a bipermutative (or symmetric bimonoidal) category $R$ by an analogue of the usual signed sum of $n$-fold products. However, it will usually not be a monoidal functor, and the inclusion $BGL_1(R) \to K(R)$ does generally not admit a retraction, which you might expect to get from a determinant. There is a counterexample in

• Christian Ausoni, Bjørn Ian Dundas, John Rognes, Divisibility of the Dirac magnetic monopole as a two-vector bundle over the three-sphere, Doc. Math. 13 (2008), 795–801.

and a discussion of what more might be needed (to circumvent this obstruction) in

• Thomas Kragh, Orientations on 2-vector bundles and determinant gerbes, Math. Scand. 113 (2013), no. 1, 63–82.

You can try to define the determinant of an $n \times n$ matrix with entries in a bipermutative (or symmetric bimonoidal) category $R$ by an analogue of the usual signed sum of $n$-fold products. However, it will usually not be a monoidal functor, and the inclusion $BGL_1(R) \to K(R)$ does generally not admit a retraction, which you might expect to get from a determinant. There is a counterexample in

Ausoni, Christian (D-BONN); Dundas, Bjørn Ian (N-BERG); Rognes, John (N-OSLO)
Divisibility of the Dirac magnetic monopole as a two-vector bundle over the three-sphere.
Doc. Math. 13 (2008), 795–801.

and a discussion of what more might be needed (to circumvent this obstruction) in

Kragh, Thomas (S-UPPS)
Orientations on 2-vector bundles and determinant gerbes.
Math. Scand. 113 (2013), no. 1, 63–82. 

You can try to define the determinant of an $n \times n$ matrix with entries in a bipermutative (or symmetric bimonoidal) category $R$ by an analogue of the usual signed sum of $n$-fold products. However, it will usually not be a monoidal functor, and the inclusion $BGL_1(R) \to K(R)$ does generally not admit a retraction, which you might expect to get from a determinant. There is a counterexample in

• Ausoni, Christian (D-BONN); Dundas, Bjørn Ian (N-BERG); Rognes, John (N-OSLO) Divisibility of the Dirac magnetic monopole as a two-vector bundle over the three-sphere. Doc. Math. 13 (2008), 795–801.

and a discussion of what more might be needed (to circumvent this obstruction) in

• Kragh, Thomas (S-UPPS) Orientations on 2-vector bundles and determinant gerbes. Math. Scand. 113 (2013), no. 1, 63–82.