期刊
LANGMUIR
卷 37, 期 7, 页码 2349-2354出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.0c03274
关键词
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资金
- Natural Science Foundation of Anhui Education Department [KJ2019A0546]
- Youth Project of Natural Science Foundation of Anhui Province [1908085QB61]
- Foundation of the National Key Laboratory [6142808180205]
- Innovative Project of Training of Six Prominent, A Top Excellent Talents of Anhui Province [2019zyrc075]
The study demonstrates that mixing LiMn2O4 and LiFePO4 together can reduce the material platform voltage difference and achieve superior performance in solid-state batteries. Batteries using LAGP-PEO (LiTFSI) composite electrolytes exhibit excellent reversible capacity and cycling stability at high temperatures.
Li1.5Al0.5Ge1.5(PO4)(3) (LAGP)-PEO composite electrolytes are unstable in LiMn2O4. In addition, the discharge platform potential (2.8 and 4.0 V) difference of LiMn2O4 is relatively large, whereas the discharge platform potential (3.5 V) of LiFePO4 is between 2.8 and 4.0 V. Thus, LiMn2O4 and LiFePO4 can be compounded together to reduce the material platform voltage difference and obtain the advantages of both materials at the same time. Here, LiMn2O4/LiFePO4 composite cathodes were applied in solid-state batteries. LAGP-PEO(LiTFSI) was used as the electrolyte. The Li/composite cathode battery using composite electrolytes has a reversible capacity of 192.8 mAh g(-1) at 50 degrees C and 0.1 C. It possesses favorable rate performance and exhibits very good cycling stability. In addition, the composite electrolytes can prevent the further occurrence of the Jahn-Teller effect. Meanwhile, the charge-transfer resistance slightly decreases in 10 cycles. The excellent capacity retention of the battery is connected with the excellent electrochemical stability and the well-interfaced contacts of the composite electrolytes with electrodes.
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