Sodium ion battery formation method and preparation method, and sodium ion battery
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A sodium-ion battery, a technology for the formation method, which is applied in the manufacture of electrolyte batteries, secondary battery charging/discharging, secondary batteries, etc. Charging efficiency, improving initial charge capacity, preventing electrolyte decomposition
Pending Publication Date: 2021-12-21
SO-FUN TECH CORP LTD
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[0005] One of the objectives of the present invention is to provide a method for forming a sodium ion battery to solve the problems of low initial cycle efficiency and low initial discharge capacity of the current sodium ion battery. out, thereby making up for the irreversible capacity loss of the first cycled sodium ions
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Embodiment 1
[0037] A preparation method of sodium ion battery, comprising the following steps:
[0038] 1) Preparation of positive electrode sheet: Na 1.92 Fe[Fe(CN) 6 ]·0.08H 2 O: acetylene black: super-P: PVDF is slurried according to the mass ratio of 90:2.5:2.5:5, coated, dried, and rolled to obtain the positive electrode sheet.
[0039] 2) Preparation of the negative electrode sheet: hard carbon: super-P: PVDF is mixed according to the mass ratio of 90:5:5, coated, dried, and rolled to obtain the negative electrode sheet. The capacity ratio of the positive electrode sheet to the negative electrode sheet is 1:1.2.
[0040] 3) Diaphragm: polyethylene diaphragm.
[0041] 4) Electrolyte: Propylene carbonate (PC): ethylene carbonate (EC) with a volume ratio of 1:1 is used as the solvent, and 1.2M NaPF is used for the sodium salt 6 , 4% fluoroethylene carbonate (FEC) and 5% pentafluoroethoxycyclotriphosphazene (PFPN) are used as additives.
[0042] 5) Battery assembly: Assemble the p...
Embodiment 2
[0046] The difference from Example 1 is the setting of the electrolyte.
[0047] 4) Electrolyte: Use propylene carbonate (PC): ethylene carbonate (EC) with a volume ratio of 1:1 as the solvent, and use 1.8M NaPF for the sodium salt 6 , 4% fluoroethylene carbonate (FEC) and 5% pentafluoroethoxycyclotriphosphazene (PFPN) are used as additives.
[0048] The rest are the same as in Embodiment 1, and will not be repeated here.
Embodiment 3
[0050] The difference from Example 1 is the setting of the electrolyte.
[0051] 4) Electrolyte: Propylene carbonate (PC): ethylene carbonate (EC) with a volume ratio of 1:1 is used as solvent, 1.8M NaTFSI is used for sodium salt, 4% fluoroethylene carbonate (FEC) and 5 % Pentafluoroethoxycyclotriphosphazene (PFPN).
[0052] The rest are the same as in Embodiment 1, and will not be repeated here.
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Abstract
The invention provides a sodium ion battery formation method and preparation method, and a sodium ion battery. The sodium ion battery formation method comprises the following steps of: placing a sodium ion cell in a formation cabinet for charging, and after the charging voltage reaches a cut-off voltage, continuing to charge the sodium ion cell to a formation upper limit voltage, wherein the formation upper limit voltage is greater than the cut-off voltage; and discharging the sodium ion cell to a lower limit voltage to complete formation of the sodium ion battery. Compared with the prior art, the sodium ion battery formation method provided by the invention is divided into two steps of charging and formation, and after formation is finished on the basis of the cut-off voltage, the voltage is continuously increased to the formation upper limit voltage for formation, so that surplus sodium ions in a positive electrode material can be removed, the first charging capacity is further improved, the irreversible capacity loss of the first circle is made up, and the first charging efficiency is improved by 1-10% at the same time.
Description
technical field [0001] The invention relates to the field of sodium ion batteries, in particular to a formation method and preparation method of a sodium ion battery and the sodium ion battery. Background technique [0002] Sodium-ion batteries have broad application prospects in the field of energy storage due to their advantages such as rich sodium resources, low cost, and good safety performance. Their working principle is similar to that of lithium-ion batteries. Come out to realize the storage and release of energy. However, during the first charge and discharge process of a sodium-ion battery, a part of the sodium ions will be consumed due to the formation of a solid electrolyte film (SEI film) at the negative electrode, resulting in the loss of the positive electrode material sodium, thus reducing the energy density of the battery. [0003] In view of the above problems, in order to improve the energy density of sodium ion batteries, the currently reported methods ma...
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