Development of new polyanionic cathode/anode active materials for post Li-ion batteries

后置锂离子电池新型聚阴离子正极/负极活性材料的开发

• 批准号: 14205124
• 负责人: OKADA Shigeto
• 金额: $ 28.95万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14205124/
• 关键词: Lithium-ion battery; Cathode active material; Intercalation; Host compound

Our research of realize low-cost and high-energy density post Li-ion batteries for EV use can be summarized as follows;1)New synthesis process for iron phosphate :a)High temperature melting synthesis for LiFePO_4 :In order to use low reactive iron oxide as starting material, FeO was melted with P_2O_5 and LiOH-H_2O at 1500 ℃ for a few minutes and cooled in an Ar atmosphere. The slow-cooled sample with 140 mAh/g shows a similar profile to solid-state synthesized olivine LiFePO_4, though the quenched amorphous sample shows a monotonically decreasing discharge profile with poor capacity.b)Low temperature soft chemistry method for FePO_4 :In the use of low cost iron powder as a starting material, metallic iron powder and P_2O_5 were reacted in water at room temperature. The highest capacity obtained by annealing at 500 ℃ was 153 mAh/g.2)Pyrophosphate systemWe could obtained LiVP_2O_7 andTiP_2O_7 as new compounds. They show both M^<2+>/M^<3+> and M^<3+>/M^<4+> redox reactions on charge/discharge cycle. Moreover, (MoO_2)_2P_2O_7 shows the largest reversible capacity (150 mAh/g) as a cathode fur Na battery.3)Borate systemWe synthesized the calcite-type iron borate (FeBO_3) as polyanionic anode with higher capacity than that of graphite. In order to reduce the voltage, the redox couple replacement from Fe to V or Ti could be done successfully.4)Silicate systemWe could synthesized the single-phase Li_2CoSiO_4. The theoretical capacity of the olivine-type silicate is two times larger than that of the olivine-type phosphate such as LiFePO_4.5)Fluoro-phosphate systemAs a new fluorophosphate system, single phase Li_2CoPO_4F could be obtained by solid-state synthesis method and the structure was identified by neutron diffraction. The theoretical capacity is two times larger than that of LiFePO_4 and the cell voltage is 4.8 V.versus Li.

我们对实现低成本和高能量密度的液化后电池进行的研究可以总结如下：1）磷酸铁铁的新合成过程：a）lifepo_4的高温融化合成：为了将低反应性氧化铁用作起始材料作为起始材料，将feo用作P_2O_5和lioh-h-h_2o的p_2o_5和lioh-h_2o，以便在1500年和lioh-h_2o中融化了一小部分。 The slow-cooled sample with 140 mAh/g Shows a similar profile to solid-state synthesized olivine LiFePO_4, though the quenched amorphous sample shows a monotonically decreasing discharge profile with poor capacity.b)Low temperature soft chemistry method for FePO_4 :In the use of low cost iron powder as a starting material, metallic iron powder and P_2O_5 were reacted in water at room temperature.通过在500时退火获得的最高容量为153 mAh/g.2）焦磷酸系统We可以获得LIVP_2O_7和TIP_2O_7作为新化合物。它们显示了M^<2+>/m^<3+>和M^<3+>/m^<4+>电荷/放电周期的氧化还原反应。此外，（MOO_2）_2P_2O_7作为阴极毛发的最大可逆能力（150 mAh/g）。3）硼酸盐Systemwe将钙型铁硼酸钙（FEBO_3）作为多元素阳极，具有比图形更高的多元素阳极。为了降低电压，可以成功完成从Fe到V或Ti的氧化还原夫妇替换。4）Silicate Systemwe可以合成单相LI_2COSIO_4。橄榄石型有机硅的理论能力比橄榄石型磷酸盐（例如LifePO_4.4.44.5）氟磷酸系统的两倍大两倍，单相LI_2COPO_4F可以通过固态合成方法和结构通过中子进行鉴定。理论能力比LifePo_4大两倍，并且电池电压为4.8 V.Versus li。

项目成果

Electrochemical Sodium Insertion into the 3D-framework of Na_3M_2(PO_4)_3 (M=Fe, V)

• DOI: 10.15017/7951
• 发表时间: 2002
• 期刊: The reports of Institute of Advanced Material Study Kyushu University
• 作者: Y. Uebou;上坊 泰史;T. Kiyabu;木藪 敏康;S. Okada;岡田 重人;J. Yamaki;山木 準一;ヤスシ ウエボウ;トシヤス キヤブ

非水電解質二次電池正極活物質

非水电解质二次电池正极活性物质

• 发表时间: 2004

岡田重人: "Charge-discharge Mechanism of LiCoPO_4 Cathode for Rechargeable Lithium Batteries"Electrochemistry. 71. 1136-1138 (2003)

Shigeto Okada：“可充电锂电池LiCoPO_4正极的充放电机理”电化学71。1136-1138（2003）

J.Yamaki et al.: "Phase Separation of Intercalation Electrode"Ionics. 8. 53-61 (2002)

J.Yamaki 等人：“嵌入电极的相分离”离子学。

Y.Uebo et al.: "Cathode Properties of Pyrophosphates for Rechargeable Lithium Batteries"Solid State Ionics. 148. 323-328 (2002)

Y.Uebo 等人：“可充电锂电池焦磷酸盐的阴极特性”固态离子学。