钙钛矿钛酸锂镧改性隔膜作为高性能锂硫电池的吸附剂和可溶性多硫化物的转化剂,ACS Sustainable Chemistry & Engineering

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钙钛矿钛酸锂镧改性隔膜作为高性能锂硫电池的吸附剂和可溶性多硫化物的转化剂
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-10-28 , DOI: 10.1021/acssuschemeng.0c05295
Ming-Yu Wang ₁ , Sheng-Hua Han ₁ , Chao-Qun Niu ₁ , Zi-Sheng Chao ₁ , Wen-Bin Luo ₁ , Hong-Guang Jin ₁ , Wen-Jun Yi ₁ , Zhe-Qiong Fan ₁ , Jin-Cheng Fan ₁

Affiliation

Li-S电池（LLTO @ Li-S）中首次采用了一种新颖的隔膜，该隔膜是通过在商用PE膜上涂覆钙钛矿钛酸锂锂（LLTO）/ Super P（SP）复合材料层构成的。已发现，与使用未涂覆隔膜（Pristine @ Li-S）的Li-S电池相比，LLTO @ Li-S电池具有明显更低的阻抗，但锂离子扩散更高。这使得可溶性多硫化物能够有效地固定并进一步电化学转化为Li ₂通过在电池放电过程中在LLTO / SP涂层隔板上形成硫代硫酸盐/聚硫酸盐中间体形成S。结果，有效地抑制了穿梭效应，特别是大大降低了阴极和隔板上的“死S”两者的钝化。这些特性确保LLTO @ Li-S电池显示出很高的比容量和倍率性能以及良好的循环稳定性。对于S负载为2 mg cm ^–2的LLTO @ Li-S电池，经过1200次循环后，其初始比容量在0.1C时的初始比容量为1491 mAh g ^–1，在1C时的残余比容量为459 mAh g ^–1。 S负载为5 mg cm ^–2的LLTO @ Li-S电池可达到，在50次循环后，在0.1C时的初始比容量为1046 mAh g ^–1，剩余比容量则为800 mAh g ^–1以上。

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Perovskite Lithium Lanthanum Titanate-Modified Separator as Both Adsorbent and Converter of Soluble Polysulfides toward High-Performance Li-S Battery

A novel separator constructed by coating a layer of perovskite lithium lanthanum titanate (LLTO)/Super P (SP) composite over a commercial PE membrane was employed for the first time in the Li-S battery (LLTO@Li-S). It was found that the LLTO@Li-S battery possessed an obviously lower impedance but higher Li-ion diffusion than the Li-S battery employing the uncoated separator (Pristine@Li-S). This enabled the soluble polysulfides to be effectively immobilized and further electrochemically transformed into Li₂S via the formation of thiosulfate/polythionate intermediates over the LLTO/SP-coated separator during the discharge of the battery. As a result, the shuttle effect was effectively inhibited, and particularly the passivation of both the cathode and “dead S” over the separator was largely decreased. These properties ensured that the LLTO@Li-S battery displayed a significantly high specific capacity and rate capability as well as good cycling stability. For the LLTO@Li-S battery with a S loading of 2 mg cm^–2, an initial specific capacity of 1491 mAh g^–1 at 0.1C and a residual specific capacity of 459 mAh g^–1 at 1C after 1200 cycles had been achieved, while for the LLTO@Li-S battery with a S loading of 5 mg cm ^–2, an initial specific capacity of 1046 mAh g ^–1 and a residual specific capacity of more than 800 mAh g^–1 at 0.1C after 50 cycles could be delivered.

更新日期：2020-10-28

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