Comparative study of Li(Li1/3Ti5/3)O4 and Li(Ni1/2−xLi2x/3Tix/3)Ti3/2O4 (x = 1/3) anodes for Li rechargeable batteries |
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| Authors: | Jongsoon Kim Sung-Wook Kim Hyeokjo Gwon Won-Sub Yoon Kisuk Kang |
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| Affiliation: | aDepartment of Materials Science and Engineering, KAIST, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea;bKAIST Institute for Eco-Energy, KAIST, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea;cSchool of Advanced Materials Engineering, Kookmin University, 861-1 Jeongneung-dong Seongbuk-gu, Seoul, 136-702, Republic of Korea |
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| Abstract: | A solid solution of spinel (2/3)Li(Li1/3Ti5/3)O4–(1/3)Li(Ni1/2Ti3/2)O4 was prepared, and its structural/electrochemical properties were compared with Li(Li1/3Ti5/3)O4 to identify the effect of doping to the structural invariance of Li(Li1/3Ti5/3)O4. The solid solution retained the zero strain characteristic of Li(Li1/3Ti5/3)O4 during discharge/charge with an excellent cycle stability, while the rate capability was notably improved. However, a reversible broadening of the XRD peak was observed at the end of discharge, indicating some structural changes. XANES measurements showed that the oxidation state of Ti was +4 and that of Ni was +2 in the solid solution. |
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| Keywords: | Lithium rechargeable battery Li(Li1/3Ti5/3)O4 Spinel Ni substitution Zero strain |
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