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Updated: May 27, 2026
Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
Synergistic Decomposition of Closo-Type Borohydrides Enables Robust Cathode-Electrolyte Interphases in Ah-Class
Yufan Chen1, Shuyang Li1, Nanyu Chen1
1College of Smart Materials and Future Energy, Fudan University, Shanghai, China.
None:
For the next generation of lithium metal batteries of high energy density and high-power density, the protection of cathodes is vital, which requires a uniform cathode-electrolyte interphase (CEI) layer with an excellent mechanical strength upon cycling. Here, we introduce closo-type borohydride Li2B12H12 as an effective electrolyte additive, via a synergistic decomposition that [B12H12]2- and [PF6]- of commercial electrolytes undergo at voltages ∼3.3 V, constructing a CEI layer rich in both fluorides and borides. The modulated CEI layer is as thin as ∼10 nm with a high Young's modulus of 8.77 GPa. This CEI enhances the electrochemical performance of LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode, as well as other ultrahigh-voltage cathodes like Li-rich Mn-based (LRMO) cathodes. The Li||LRMO battery not only reaches an outstanding rate performance at 10 C, but also reaches an energy density of 392 Wh kg-1 in a 3 Ah-class pouch cell. This synergistic decomposition strategy of the closo-type borohydride additive effectively provides a reference for the modulation of an ultrathin and strong CEI, balancing both energy density and power density of the battery.
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