The invention relates to a positive electrode active material for a sodium-ion battery, a sodium-ion battery prepared from the active material, a battery module, a battery pack and a device. Specifically the positive electrode active material for the sodium-ion battery mainly contains an O3 phase layered metal oxide having the following molecular formula: Na[a]M[b]Ni[c]Fe[d]Mn[e]O[2+/-[delta]] (in formula I), M represents a metal cation different from Ni, Fe and Mn, a is more than 0.67 and less than 1.1, b is more than 0 and less than 0.25, preferably b is more than 0.05 and less than 0.15, c is more than 0 and less than 0.3, preferably c is more than 0.05 and less than 0.25, b + c is more than 0 and less than 0.55, d + e is more than 0.45 and less than 1, b + c + d + e is equal to 1, delta is more than or equal to 0 and less than or equal to 0.1, and the metal cation is selected from at least one of Li<+>, Cu<2+>, Zn<2+>, Co<2+> and Ti<4+>. The invention also relates to a sodium ion battery suitable for high voltages, wherein the sodium ion battery comprises the positive electrode active material according to the invention. The sodium ion battery prepared from the positive electrode active material shows excellent high-voltage specific capacitance and high-voltage cycle performance.
本发明涉及钠离子电池用正极活性材料、由该活性材料制成的钠离子电池、电池模块、电池包及装置。具体地,所述钠离子电池用正极活性材料,其主要包含O3相层状金属氧化物,所述O3相层状金属氧化物具有如下分子式:NaaMbNicFedMneO2±δ(式I)式I中,M为不同于Ni、Fe和Mn的金属阳离子;0.67<0.55;0.45<1;且b+c+d+e=1;0≤δ≤0.1,其中,所述金属阳离子选自Li+、Cu2+、Zn2+、Co2+、Ti4+中的至少一种。本发明还涉及一种适用于高电压的钠离子电池,其包含根据本发明的正极活性材料。采用根据本发明的正极活性材料制备的钠离子电池显示优异的高压比电容和高压循环性能。
Positive electrode active material for sodium-ion battery, sodium-ion battery made of same, battery module, battery pack, and device
钠离子电池用正极活性材料、由该活性材料制成的钠离子电池、电池模块、电池包及装置
2021-04-16
Patent
Electronic Resource
Chinese
IPC: | H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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