Design of a new lithium ion battery test cell for in-situ neutron diffraction measurements

► A new cell design for in situ neutron diffraction measurements of lithium ion batteries. ► Cell components are compared and a combination to provide optimal electrochemical and diffraction measurements is identified. ► Structural changes during charge and discharge of a LiFePO4 cathode are monitored. ► Patterns were refined to obtain lattice parameters and atomic positions.