Li₂NiO₂F a New Oxyfluoride Disordered Rocksalt Cathode Material

Abstract

Lithium-rich disordered rocksalts such as Li 1.3 Nb 0.3 Mn 0.4 O 2 and Li 2 MnO 2 F are being investigated as high energy density cathodes for next generation Li-ion batteries. They can support the (de) lithiation of lithium ions over large compositional ranges while preserving the same overall structure. Here, we present a new Ni-rich oxyfluoride cathode, Li 2 NiO 2 F, with a disordered rocksalt structure. Li 2 NiO 2 F and can deliver a discharge capacity of 200 mAh g −1 at an average voltage of 3.2 V.

Under pressure: offering fundamental insight into structural changes on ball milling battery materials

“…1 Notable early examples reported in the literature are summarised in Table 1. 2–5 The synthesis of these particular phases has relied extensively on high impact ball milling, particularly for the F containing systems, although there has been growing research showing that some lower F content (usually less than 10%) DRS systems can be prepared by standard high temperature synthesis. 6–10…”

Understanding the limits to short-range order suppression in many-component disordered rock salt lithium-ion cathode materials

“…[13][14][15] Embracing cation disorder enables the use of novel cathode chemistries that do not need to maintain a layered ordering on cycling. 7,[16][17][18][19][20][21][22][23] The performance of any intercalation cathode is limited by the ability of lithium to reversibly intercalate into the host framework which is dependent on atomistic diffusion processes. Fig.…”

Understanding the limits to Short-range order Suppression in Many-Component Disordered Rock Salt Lithium-ion Cathode Materials

“…Embracing cation disorder enables the use of novel cathode chemistries that do not need to maintain a layered ordering on cycling [7,[16][17][18][19][20][21][22][23]. The performance of any intercalation cathode is limited by the ability of lithium to reversibly intercalate into the host framework which is dependent on atomistic diffusion processes.…”