Degradation of spinel lithium manganese oxides by low oxidation durability of LiPF6-based electrolyte at 60 °C

Tunable and Robust Phosphite-Derived Surface Film to Protect Lithium-Rich Cathodes in Lithium-Ion Batteries

“…The Mn-L 3 /L 2 ratio of the cycled cathode surface decreased from 3.43 to 2.47 by using the TMSP additive (Figure 8c,d). The increment in the Mn-L 3 / L 2 ratio with the addition of TMSP suggests that the TMSPderived SEI effectively suppressed the valence state drop of Mn ions (for instance, the reduction of Mn 4+ to Mn 3+ by taking the electrons from the oxidative decomposition of the electrolyte) 53 as depicted in Figure 4. Mn 3+ undergoes a disproportion reaction releasing Mn 2+ of low Mn ion valence state and yielding Mn 4+ ions.…”

Surface chemistry of LiNi0.5Mn1.5O4 particles coated by Al2O3 using atomic layer deposition for lithium-ion batteries

“…It is important issues that Jahn-teller distortion and disproportionation reaction by Mn 3+ at charge process. [39,40] To solve these problems, researchers reported excess-lithium, aluminum ions and magnesium ions to insert in spinel structure for making higher oxidation state.…”

Vinylene carbonate and tris(trimethylsilyl) phosphite hybrid additives to improve the electrochemical performance of spinel lithium manganese oxide/graphite cells at 60 °C

“…To produce highly reliable batteries with spinel lithium manganese oxide cathodes, it is necessary to develop feasible methods to suppress manganese dissolution via the disproportionation reaction (2 Mn 3 + ! Mn 4+ + Mn 2+ ), Jahn-Teller distortion and oxidative decomposition of the electrolyte on the surface of the spinel LiMn 2 O 4 cathodes [6][7][8][9][10]. It is known that the use of functional electrolyte additives is one of the most effective methods to improve limited electrochemical performance by preventing unwanted electrolyte decomposition at the anode and cathode, thereby improving electrochemical performances of LIBs [1,10].…”