A special enabler for boosting cyclic life and rate capability of LiNi0.8Co0.1Mn0.1O2: Green and simple additive

Enhancing the Electrochemical Performance of a High‐Voltage LiNi0.5Mn1.5O4 Cathode in a Carbonate‐Based Electrolyte with a Novel and Low‐Cost Functional Additive

“…And for 1wt% BA additive, the lower capacity can be ascribed to the higheroxidation activity of BA at larger content leadingt ot he formationo fathicker film covering the surface of LNMO. [30,36] This phenomenonc an be confirmed by the SEM images after cycling ( Figure S2). The SEM images clearly reveal that an obvious crack is obtained in the LNMO cathode electrode cycled in STE + 0.3 wt %B A.…”

“…[16,55] The less decomposition of LiPF 6 indicates that the BA is able to rapidly react with trace water in electrolyte more to mitigate the hydrolysis reaction of LiPF 6 . [30] This phenomenon is confirmedb y the FTIR spectrao fS TE + 0.5 wt %B Ab efore and after cycled in LNMO/Li cell, as showni nF igure S7. The characteristic peaks of butyric acid which derived from the reactiono fB Aa nd trace water characteristic peaks were exhibiteda t2 928 and 1460 cm À1 respectively,w hich assignedt oO ÀHa nd CÀOÀH functional groups.…”

“…[25,34,[56][57][58] Therefore, this result confirms that BA additive is helpful to keep the structure stability of LNMO electrode during the cycling process. [30,55] In the P2 ps pectra of LNMO contains two peaks located at 133.4 and 134.5 eV,c orresponding to Li x PO y F z deriving from the hydrolysis of LiPF 6 salt and LiPF 6 /Li x PF y coming from deposit of LiPF 6 on the surface of electrode (Figure 5d). [25,28] The result further confirms that decomposition of LiPF 6 wass uppressed by adding BA, corresponding to the F1 ss pectra.…”

“…Sun'sg roup proved that the succinic anhydridei sagreen and simple additive for constructing CEI films, at the same time, anhydridec an quickly react with trace water in the electrolyte to mitigate the hydrolysis reaction of LiPF 6 . [30] We chose butyric anhydride (BA), with itsl ow molecular weight, low cost, environmental benignity,a nd similar structure to succinic anhydride, as the additive ( Figure S1), and first investigated it as ac athode-film-forminga dditive in LiPF 6based carbonate electrolytes for high-voltage LNMO/Li cells. The reversible capacity,c ycling stability, and rate performance of LNMO/Li cells have been improved significantly.F urthermore, electrochemical measurements and ex-situ analysisw ere conducted to understand the role and mechanism of BA as additive to improve the performance of LNMO/Li cells.…”

Stress and its influencing factors in positive particles of lithium‐ion battery during charging

“…However, these studies mainly analyzed the stress and its influencing factors during discharging. But for LIBs, the stress in positive particles during charging is also one of the important decay reasons 28 . When the battery is manufactured, the positive particles are in the Li‐rich state.…”