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Sodium supplementing method for sodium-ion battery and sodium-ion battery

A sodium-ion battery and charging voltage technology, which is applied in the field of sodium-supplementing sodium-ion batteries and sodium-ion batteries, can solve the problem of low coulombic efficiency for the first time of sodium-ion batteries, and achieve the effects of convenient operation, reduced losses, and improved coulombic efficiency

Active Publication Date: 2017-06-13
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for replenishing sodium at the positive electrode of a sodium ion battery, aiming at solving the problem of low coulombic efficiency of the sodium ion battery for the first time

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Embodiment Construction

[0022] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0023] refer to figure 1 , the method for supplementing sodium at the positive electrode of the sodium ion battery proposed by the embodiment of the present invention includes:

[0024] S1: Mix metal element and sodium salt according to a certain molar ratio, add them as positive electrode additives to the positive electrode active material, prepare the positive electrode sheet of sodium ion battery, and assemble it into a battery;

[0025] S2: In the battery formation stage, control the first charge voltage range to completely react the metal element with the sodium salt, release the sodium ions in the positive electrode additive to the negative electrode sheet, and participate in the formation of the SEI film;

[0026] S3: Control the battery cycle charge and discharge voltage range, so that the sodium ion battery ...

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Abstract

The invention discloses a sodium supplementing method for a sodium-ion battery. The sodium supplementing method includes: mixing a metal element and a sodium salt according to a certain molar ratio, adding the mixture as the anode additive into an anode active material to prepare a sodium-ion battery anode plate, and assembling into a battery; in a battery formation stage, controlling an initial charge voltage range to allow the metal element to have complete reaction with the sodium salt so as to release sodium ions from the anode additive to a cathode plate to form an SEI (solid electrolyte interphase) film; controlling a battery cyclic charge-discharge voltage range to allow the sodium-ion battery to enter a normal charge-discharge use state, wherein the metal element in the additive exists in the battery in the form of a metal compound. The sodium supplementing method for the sodium-ion battery has the advantages that the loss of active sodium ions in the anode material is reduced, the initial coulombic efficiency of the sodium-ion battery is increased, and the method is safe, practical and convenient to operate.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a sodium-supplementing method for a sodium-ion battery and a sodium-ion battery. Background technique [0002] The working principle of sodium-ion batteries is similar to that of lithium-ion batteries, using the intercalation process of sodium ions between the positive and negative electrodes to achieve charge and discharge. Compared with lithium-ion batteries, sodium-ion batteries have the following advantages: (1) Na-salt raw materials are rich in reserves and low in price. Compared with lithium-ion battery ternary cathode materials, the cost of raw materials is reduced by half by using iron-manganese-nickel-based cathode materials; 2) Due to the characteristics of sodium salt, it is allowed to use low-concentration electrolyte (with the same concentration electrolyte, the conductivity of sodium salt is about 20% higher than that of lithium electrolyte) to reduce costs; (3) sodium ions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/054
CPCH01M10/054H01M10/4242Y02E60/10
Inventor 李国龙褚春波张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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