Synthesis and electrochemical properties of Li+-ion conducting solid electrolytes in the system xLiCl·(25-x)LiBr·75Li3PS4

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2024-11-01 DOI:10.1016/j.ssi.2024.116725

Jeffy Jeffy, Nobuya Machida

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Abstract

The sulfide solid electrolyte xLiCl·(25-x)LiBr·75Li₃PS₄ was synthesized by a two-step glass-ceramic method. In the first step, amorphous precursors were obtained by a high-energy ball-milling method, and in the second step, the obtained precursors were heated up to a temperature in the range of 165 to 180 °C in order to obtain crystalline samples. The LGPS-like crystalline phase was precipitated in the heat-treated samples in the 0 < x < 12.5 composition range. The glass-ceramic samples showed high ion conductivities of 3 × 10⁻³ to 4 × 10⁻³ S cm⁻¹ at 25 °C. A charge-discharge test was conducted on an all-solid-state test cell using the 7.5LiCl·17.5LiBr·75Li₃PS₄ (mol%) glass-ceramic sample as a separator. The cathode composite of the test cell was a mixture of LiNi_1/3Mn_1/3Co_1/3O₂ (NMC) active materials, the solid electrolyte, and acetylene black. The test cell exhibited high electrochemical stability and the electrochemical capacity based on NMC active materials was 145 mAhg⁻¹.

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xLiCl-(25-x)LiBr-75Li3PS4体系中锂离子传导固体电解质的合成与电化学特性

硫化物固体电解质 xLiCl-(25-x)LiBr-75Li3PS4 是通过两步玻璃陶瓷法合成的。第一步，通过高能球磨法获得无定形前驱体；第二步，将获得的前驱体加热到 165 至 180 °C，以获得结晶样品。在 0 < x < 12.5 成分范围内，热处理样品中析出了类 LGPS 结晶相。玻璃陶瓷样品在 25 °C 时显示出 3 × 10-3 至 4 × 10-3 S cm-1 的高离子导电率。使用 7.5LiCl-17.5LiBr-75Li3PS4 (mol%) 玻璃陶瓷样品作为隔膜，在全固态试验电池上进行了充放电试验。试验电池的阴极复合材料是镍钴锰锂（NMC）活性材料、固体电解质和乙炔黑的混合物。试验电池具有很高的电化学稳定性，基于 NMC 活性材料的电化学容量为 145 mAhg-1。

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.