XAFS Characterization of Li Deintercalation in Rechargeable Lithium Battery Materials, LiCoO2-LiNiO2
نویسندگان
چکیده
111 sitzr measurements of the Ni and Co K-edge XAFS spectra of Li1.~Ni02 and Lil.,CoOz as a function of x were successfully carried out for the first time using an electrocl~emical ceii. It is observed that a local Jahn-Teller distortion of the Ni06 octahedron in LiN102 was reduced with deintercalation of Li which caused oxidatiou of the Jahn-Teller d7 ~ i ~ * ion to do Ni4+i011. A substitution of Co for Ni in LiNiO? also reduced the local distortion of the NiO, octahedron. XANES spectra of LiNi02 shifted to higher energy side with increasing x while an abrupt shape change was observed in the XANES spectra of Li,.,CoOl correspollding to phase trausition.
منابع مشابه
NMR studies of cathode materials for lithium-ion rechargeable batteries.
Lithium intercalation or insertion materials have been widely investigated in the search for new electrode materials for use in high-voltage rechargeable batteries.1-6 The first commercial Li-ion rechargeable battery contains the layered materials LiCoO2 (Figure 1) and graphite as the cathode (or positive electrode) and anode (or negative electrode), respectively.7 Although this battery is the ...
متن کاملNanostructured Vanadium Oxide Electrodes for Enhanced Lithium-Ion Intercalation
Intercalation-electrode materials are electroactive and serve as host solids into which guest species are reversibly intercalated from an electrolyte. Currently there are three intercalation materials that are used commercially as positive-electrode materials in lithium-ion rechargeable batteries: LiCoO2, LiNiO2, and LiMn2O4. LiCoO2 is the most popular among the possible cathode materials becau...
متن کاملAn aqueous rechargeable lithium battery of high energy density based on coated Li metal and LiCoO2.
Using a coated Li metal as an anode and LiCoO2 as a cathode, an aqueous rechargeable battery is built up, whose average discharge voltage is 3.70 V. This high voltage stability is due to the "cross-over" effect of Li(+) ions, which is different from the traditional ways of increasing overpotentials. The total energy density can be 465 W h kg(-1).
متن کاملTECHNICAL PAPERS ELECTROCHEMICAL SCIENCE AND TECHNOLOGY Characterization of LT-LixCOl_yNiyO Electrodes for Rechargeable Lithium Cells
LT-LiCo0.gNi0102 prepared at 400~ with a structure that is intermediate between an ideal lithiated spinel and a layered structure has been investigated as an electrode in rechargeable li thium cells; it delivers a voltage vs. pure lithium that is significantly lower than the voltage provided by its high-temperature analogue, HT-LiCo09Ni0 ~O~, (synthesized at 900~ The rechargeability of Li/LT-Li...
متن کاملElectrochemical Characterization of Low-Cost Lithium-Iron Orthosilicate Samples as Cathode Materials of Lithium-Ion Battery
Lithium-iron-orthosilicate is one of the most promising cathode materials for Li-ion batteries due to its safety, environmental brightness and potentially low cost. In order to produce a low cost cathode material, Li2FeSiO4/C samples are synthesized via sol-gel (SG; one sample) and solid state (SS; two samples with different carbon content), starting from Fe (III) in the raw materials (lo...
متن کامل