期刊
ACS APPLIED ENERGY MATERIALS
卷 1, 期 8, 页码 3630-3635出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b00345
关键词
titanates; lepidocrocite-type; interlayer water; binder; negative electrode materials; sodium ion batteries; rechargeable batteries
资金
- JST A-STEP [AS2614056L]
- MEXT program Elements Strategy Initiative to Form Core Research Center, MEXT: Ministry of Education Culture, Sports, Science and Technology, Japan
Lepidocrocite-like titanate, Na-0.9[Ti1.7Li0.3]O-4, having a C-base-centered lattice (C-type) is prepared by dehydration of Na-0.9[Ti1.7Li0.3]O-4 center dot nH(2)O having a primitive lattice (P-type) and influence of the interlayer water on its electrochemical performance is examined in nonaqueous Na cells. Upon heating up to 350 degrees C, P-type Na-0.9[Ti1.7Li0.3]O-4 center dot nH(2)O transforms into the anhydrous C-type phase as a result of gradual removal of the interlayer water. The C-type Na-0.9[Ti1.7Li0.3]O-4 delivers reversible capacity of 120 mAh g(-1) between 2.0 and 0.1 V vs Na with high Coulombic efficiency at an initial cycle and good capacity retention over 50 cycles. Structural change of the C-type phase during sodiation is investigated by using operando X-ray diffraction measurement.
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