A new halospinel superionic conductor for high-voltage all solid state lithium batteries,Energy & Environmental Science

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A new halospinel superionic conductor for high-voltage all solid state lithium batteries
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-06-10 , DOI: 10.1039/d0ee01017k
Laidong Zhou _{1,

2,

3,

4} , Chun Yuen Kwok _{1,

2,

3,

4} , Abhinandan Shyamsunder _{1,

2,

3,

4} , Qiang Zhang _{5,

6,

7,

8} , Xiaohan Wu _{9,

10,

11} , Linda F. Nazar _{1,

2,

3,

4}

Affiliation

We report a new Li-superionic chloride, Li₂Sc_2/3Cl₄, that crystallizes in a disordered spinel structure, and exhibits an ionic conductivity of 1.5 mS cm⁻¹ with a low activation energy barrier for Li⁺ ion diffusion of 0.34 eV. This material is the first spinel-type superionic halide. Structural elucidation via powder neutron diffraction reveals a significantly disordered Li⁺-ion distribution over available tetrahedral and octahedral sites within the lattice, forming an infinitely 3D connected Li⁺ ion diffusion pathway comprised of face-sharing octahedra and tetrahedra. Due to the high oxidative stability of Li₂Sc_2/3Cl₄, all solid state lithium batteries employing Li₂Sc_2/3Cl₄ and high voltage cathodes (LiCoO₂, LiNi_0.6Mn_0.2Co_0.2O₂ or high-Ni LiNi_0.85Mn_0.1Co_0.05O₂) – without any coating – exhibit excellent electrochemical performance up to 4.6 V in terms of capacity retention and cycle life.

中文翻译：

一种用于全固态高压锂电池的新型晕环松超导体

我们报告了一种新的锂超离子氯化物，Li ₂ Sc _2/3 Cl ₄，在无序的尖晶石结构中结晶，并显示出1.5 mS cm ^-1的离子电导率，而Li ⁺离子扩散的活化能垒低，为0.34 eV。该材料是第一个尖晶石型超离子卤化物。通过粉末中子衍射的结构解析揭示了晶格内可用四面体和八面体位点上显着无序的Li ⁺离子分布，形成了由面共享八面体和四面体组成的无限3D连接的Li ⁺离子扩散途径。由于Li ₂的高氧化稳定性Sc _2/3 Cl ₄，使用Li ₂ Sc _2/3 Cl _4的所有固态锂电池和高压阴极（LiCoO ₂，LiNi _0.6 Mn _0.2 Co _0.2 O ₂或高Ni LiNi _0.85 Mn _0.1 Co _0.05 O ₂） –没有任何涂层–在容量保持率和循环寿命方面表现出高达4.6 V的出色电化学性能。

更新日期：2020-07-15

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