University of California

Lg Energy Solution, Ltd.

Minghao Zhang

Ying Shirley Meng

Wang Mo Jung

Dong Hun Lee

Chi Ho Jo

Haodong Liu

Danna Qian

Chengcheng Fang

Abhik Banerjee

A method of treating the surface of a positive electrode active material that is capable of inhibiting a reaction at the interface between a sulfide-based solid electrolyte and the positive electrode active material. A positive electrode active material particle for sulfide-based all-solid-state batteries, the surface of which is reformed, using the method and a sulfide-based all-solid-state battery, the charge/discharge characteristics of which are improved, including the same are also disclosed. The positive electrode active material particle for sulfide-based all-solid-state batteries manufactured using a dry-type method exhibits larger capacity than a positive electrode active material particle for sulfide-based all-solid-state batteries manufactured through a conventional wet-type process. In addition, the manufacturing process is simplified, and the amount of byproducts is reduced.

Positive electrode active material particle for sulfide-based all-solid-state batteries

A lithium-excess cathode material according to Li1+xNiaMnbCocModO2&#x2212;y (0&#x3c;x&#x3c;0.3, 0&#x2264;a&#x2264;1, 0&#x2264;b&#x2264;1, 0&#x2264;c&#x2264;1, 0&#x2264;d&#x2264;0.2, 0&#x2264;y&#x2264;0.25) in the form of secondary spherical microparticles formed from primary spherical nanoparticles. The primary nanoparticles can in the range of &#x2dc;130 nm to 170 nm and the secondary in the range of &#x2dc;2-3 &#x3bc;m. A method of formation includes mixing a carbonates or hydroxides solution into a mixed solution of transition metal (M) ions with predetermined stoichiometry under stirring, and aging resulting transition metal carbonates or hydroxides at a predetermined temperature for period of time to produce primary nanoparticles of a predetermined size. A gas-solid interface reaction to uniformly creating oxygen vacancies without affecting structural integrity of Li-excess layered oxides is also provided.

Lithium-excess cathode material and co-precipitation formation method

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La Jolla, CA, United States of America

Minghao Zhang