A green recycling process was designed and used to recycle spent LiCoO 2 batteries, and the recycled LiCoO 2 was regenerated after the solid state synthesis with Li 2 CO 3 . XRD results showed that the layered structure of LiCoO 2 was repaired after regeneration. The physical and chemical properties (XRD, morphology, tap density, average particle size, specific surface areas and pH 10 value) and electrochemical properties (discharge capacity, attenuation rate of capacity, plateau retention at 3.6V and attenuation rate of plateau) of LiCoO 2 after regeneration were tested in detail and compared with commercial LiCoO 2 .The test datas show that the regenerated LiCoO 2 at 900 °C can meet the commercial requirements for reuse.

No abstract

According to the tetrahedral phase diagram of LiNiO2–LiCoO2–LiMnO2–Li2MnO3, a series of Li1.2(Ni0.2Mn0.6)x(Co0.4Mn0.4)y(Ni0.4Mn0.4)1−x−yO2 (0 ≤ x + y ≤ 1) have been designed to explore new Li-rich solid solution cathode materials.

A Li7P3S11 glass-ceramic solid electrolyte and a core–shell S@BP2000 nanocomposite are used to fabricate all-solidstate Li–S batteries, which exhibit outstanding cycle stability and rate capabilities.

No abstract

No abstract

No abstract

Core-shell and concentration-gradient layered oxide cathode materials deliver superior electrochemical properties such as long cycle life and outstanding thermal stability. However, the origin of enhanced performance is not clear and seldom investigated until now. Here, a specific structured layered oxide (LiNi0.5Co0.2Mn0.3O2) consisting of concentration-gradient core, transition layer, and stable outer shell, is designed and achieved from double-shelled precursors to overcome the great challenge by comparison with the normal layered LiNi0.5Co0.2Mn0.3O2. As expected, the specific structured layered oxide displays excellent cycle life and thermal stability. After numerous cycles, the valence state of Ni and Co at normal layered oxide surface tends to a higher oxidation state than that of the specific structured oxide, and the spinel phase is observed on particle surface of normal layered oxide. Also, the deficient spinel/layered mixed phases lead to high surface film and charge-transfer resistance for normal layered oxide, whereas the specific structured one still remains a layered structure. Those results first illustrate the origin of improved electrochemical performance of layered core-shell and concentration-gradient cathode materials for lithium-ion batteries.