Colloid Electrolyte Containing Li3P Nanoparticles for Highly Stable 4.7 V Lithium Metal Batteries,ACS Nano

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Colloid Electrolyte Containing Li3P Nanoparticles for Highly Stable 4.7 V Lithium Metal Batteries
ACS Nano ( IF 15.8 ) Pub Date : 2024-08-07 , DOI: 10.1021/acsnano.4c08349
Xiaoya He _{1,

2,

3} , Wei Hao _{1,

4} , Zidan Shi ₁ , Yihong Tan ₁ , Xinyang Yue _{1,

5} , Yujun Xie ₂ , Xuzhou Yan ₁ , Zheng Liang _{1,

5}

Affiliation

Lithium metal batteries (LMBs) with LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) cathodes have garnered significant interest as next-generation energy storage devices due to their high energy density. However, the instability of their electrode/electrolyte interfaces in regular carbonate electrolytes (RCEs) results in a rapid capacity decay. To address this, a colloid electrolyte consisting of Li₃P nanoparticles uniformly dispersed in the RCE is developed by a one-step synthesis. This design concurrently creates stable cathode electrolyte interphase (CEI) and solid electrolyte interphase (SEI) on both electrode surfaces. The cathode interface derived from this colloid electrolyte significantly facilitates the decomposition of Li salts (LiPF₆ and LiDFOB) on the cathode surface by weakening the P–F and B–F bonds. This in situ formed P/LiF-rich CEI effectively protects the NCM811 cathode from side reactions. Furthermore, the Li₃P embedded in the SEI optimizes and homogenizes the Li-ion transport, enabling dendrite-free Li deposition. Compared to the RCE, the designed colloid electrolyte enables robust cathode and anode interfaces in NCM811||Li full cells, minimizing gas and dendrite formation, and delivering a superior capacity retention of 82% over 120 cycles at a 4.7 V cutoff voltage. This approach offers different insights into electrolyte regulation and explores alternative electrolyte shapes and formulations.

中文翻译：

用于高度稳定的 4.7 V 锂金属电池的含 Li3P 纳米颗粒的胶体电解质

采用 LiNi _0.8 Co _0.1 Mn _0.1 O ₂ (NCM811) 阴极的锂金属电池 (LMB) 由于其高能量密度而作为下一代储能设备引起了人们的广泛关注。然而，常规碳酸盐电解质（RCE）中电极/电解质界面的不稳定性导致容量快速衰减。为了解决这个问题，通过一步合成开发了一种由均匀分散在 RCE 中的 Li ₃ P 纳米颗粒组成的胶体电解质。该设计同时在两个电极表面上产生稳定的阴极电解质界面（CEI）和固体电解质界面（SEI）。源自这种胶体电解质的阴极界面通过削弱 P-F 和 B-F 键，显着促进了阴极表面上的 Li 盐（LiPF ₆和 LiDFOB）的分解。这种原位形成的富含 P/LiF 的 CEI 有效保护 NCM811 阴极免受副反应的影响。此外，SEI 中嵌入的 Li ₃ P 优化并均匀化了锂离子传输，从而实现无枝晶的锂沉积。与 RCE 相比，设计的胶体电解质可在 NCM811||Li 全电池中实现坚固的阴极和阳极界面，最大限度地减少气体和枝晶的形成，并在 4.7 V 截止电压下在 120 个循环中提供 82% 的卓越容量保持率。这种方法提供了对电解质调节的不同见解，并探索替代电解质形状和配方。

更新日期：2024-08-07

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