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Favorable Electrochemical Performance of LiMn2O4/LiFePO4 Composite Electrodes Attributed to Composite Solid Electrolytes for All-Solid-State Lithium Batteries
Langmuir ( IF 3.7 ) Pub Date : 2021-02-08 , DOI: 10.1021/acs.langmuir.0c03274 Chunhua Wang 1, 2 , Guoliang Bai 1 , Xingjiang Liu 2 , Yang Li 2
Langmuir ( IF 3.7 ) Pub Date : 2021-02-08 , DOI: 10.1021/acs.langmuir.0c03274 Chunhua Wang 1, 2 , Guoliang Bai 1 , Xingjiang Liu 2 , Yang Li 2
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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 °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.
中文翻译：
全固态锂电池的复合固体电解质LiMn 2 O 4 / LiFePO 4复合电极的良好电化学性能
Li 1.5 Al 0.5 Ge 1.5（PO 4）3（LAGP）-PEO复合电解质在LiMn 2 O 4中不稳定。另外，LiMn 2 O 4的放电平台电势（2.8和4.0 V）的差异较大，而LiFePO 4的放电平台电势（3.5 V）在2.8和4.0 V之间。因此，LiMn 2 O 4和LiFePO可以将4混合在一起以减少材料平台的电压差并同时获得两种材料的优点。在这里，LiMn 2 O 4/ LiFePO 4复合阴极应用于固态电池。LAGP-PEO（LiTFSI）用作电解质。使用复合电解质的锂/复合阴极电池在50°C和0.1 C下的可逆容量为192.8 mAh g –1。它具有良好的倍率性能，并具有非常好的循环稳定性。此外，复合电解质还可以防止Jahn–Teller效应的进一步发生。同时，电荷转移电阻在10个循环中略有下降。电池出色的容量保持能力与出色的电化学稳定性以及复合电解质与电极的良好界面接触有关。
更新日期：2021-02-23
中文翻译：
全固态锂电池的复合固体电解质LiMn 2 O 4 / LiFePO 4复合电极的良好电化学性能
Li 1.5 Al 0.5 Ge 1.5（PO 4）3（LAGP）-PEO复合电解质在LiMn 2 O 4中不稳定。另外，LiMn 2 O 4的放电平台电势（2.8和4.0 V）的差异较大，而LiFePO 4的放电平台电势（3.5 V）在2.8和4.0 V之间。因此，LiMn 2 O 4和LiFePO可以将4混合在一起以减少材料平台的电压差并同时获得两种材料的优点。在这里，LiMn 2 O 4/ LiFePO 4复合阴极应用于固态电池。LAGP-PEO（LiTFSI）用作电解质。使用复合电解质的锂/复合阴极电池在50°C和0.1 C下的可逆容量为192.8 mAh g –1。它具有良好的倍率性能，并具有非常好的循环稳定性。此外，复合电解质还可以防止Jahn–Teller效应的进一步发生。同时，电荷转移电阻在10个循环中略有下降。电池出色的容量保持能力与出色的电化学稳定性以及复合电解质与电极的良好界面接触有关。
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