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Lithium secondary battery

A lithium secondary battery, metal lithium technology, applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, sustainable manufacturing/processing, etc., can solve the problems of easy generation of lithium dendrites, battery safety, etc., and achieve inhibition of lithium dendrite growth. , The effect of promoting uniform distribution and overcoming safety problems caused by battery short circuit

Active Publication Date: 2017-10-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a new lithium secondary battery in order to overcome the defect that lithium dendrites are easily generated in the lithium secondary battery cycle process existing in the prior art
The lithium secondary battery provided by the present invention can overcome the defect that lithium dendrites are locally formed in the negative electrode material of the existing lithium secondary battery, causing the short circuit of the battery and causing safety problems.
Therefore, changing the surface morphology of the metal lithium anode to promote the uniform distribution of the electric field on the surface of the metal lithium anode can fundamentally solve the problem of lithium dendrite growth.

Method used

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Embodiment approach

[0030] According to a preferred embodiment of the present invention, the thickness of the metal lithium particle layer is 300-1500 μm, preferably 500-1300 μm. When the metal lithium particle layer is too thick, the excessive specific surface area increases the side reaction between the electrode and the electrolyte, which is not conducive to the increase of the coulombic efficiency of the battery; when the metal lithium particle layer is thin, the electrode and the electrolyte are reduced. The wettability is not conducive to the migration of lithium ions at the interface.

[0031] In the present invention, the thickness of the lithium metal particle layer is observed by a high-power scanning electron microscope.

[0032] According to a preferred embodiment of the present invention, the lithium metal particles in the lithium metal particle layer are in block shape. The blocks may be regular or irregular, which is not particularly limited in the present invention. Preferably, th...

Embodiment 1

[0077] This embodiment is used to illustrate the lithium secondary battery provided by the present invention.

[0078] (1) Preparation of negative electrode materials

[0079] a) Under the atmosphere of high-purity argon (99.999% by volume, commercially available), mix 0.08g of ammonium bifluoride with 10g of dimethyl sulfoxide (purity greater than 99.9% by weight), and stir at 25°C for 8h at a stirring speed of 800r / min, to obtain the pretreatment liquid;

[0080] b) Immerse the lithium sheet from which the surface passivation layer has been removed in the pretreatment solution, and react at 25°C for 24h under stirring conditions (800r / min);

[0081] c) Take out the solid matter obtained from the reaction in step b), and dry it at 25° C. for 2 h under the condition of argon flow (the flow rate of argon is 2.5 L / min), to obtain metal lithium negative electrode material S1.

[0082] SEM and XRD test and analysis were carried out on metal lithium anode material S1, the results...

Embodiment 2

[0089] This embodiment is used to illustrate the lithium secondary battery provided by the present invention.

[0090] (1) Preparation of negative electrode materials

[0091] a) Under the atmosphere of high-purity argon (99.999% by volume, commercially available), mix 0.04g of ammonium bifluoride with 10g of dimethyl sulfoxide (purity greater than 99.9% by weight), and stir at 25°C for 8h at a stirring speed of 800r / min, to obtain the pretreatment liquid;

[0092] b) Immerse the lithium sheet from which the surface passivation layer has been removed in the pretreatment solution, and react at 30°C for 18h under stirring conditions (800r / min);

[0093] c) Take out the solid matter obtained from the reaction in step b), and dry it at 25° C. for 2 h under the condition of argon flow (the flow rate of argon is 2.5 L / min), to obtain metal lithium negative electrode material S2.

[0094] SEM and XRD test and analysis were carried out on the metallic lithium negative electrode mate...

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Abstract

The invention relates to the field of batteries, and discloses a lithium secondary batter. The lithium secondary battery comprises a positive electrode, a negative electrode and electrolyte; a negative electrode material of the negative electrode comprises a lithium base body, a metal lithium particle layer formed on the surface of the lithium base body and a protection layer formed on the surface of the metal lithium particle layer in a conformal covering mode; the porosity of the metal lithium particle layer is 10%-80%; the protection layer contains lithium salt, and the negative ion of the lithium salt is selected from at least one of F-, CO32-, PO43-, TFSI-, FSI-, OH-, SO3-, R1-COO- and a trifluoromethanesulfonate ion, wherein R1 represents C1-C20 alkyl. The lithium secondary battery can overcome the defect that an existing lithium secondary battery negative electrode material partially generates lithium dendrites to cause a short circuit to trigger safety problems.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium secondary battery. Background technique [0002] Lithium metal has a high theoretical specific capacity (3860mAh g -1 ), low density (0.59g·cm -3 ) and the most negative oxidation-reduction potential (-3.040Vvs. standard hydrogen electrode) and is considered to be an ideal secondary battery anode material. As lithium-ion battery technology becomes more and more mature, the actual capacity is getting closer and closer to the theoretical capacity, and it is difficult for lithium-ion batteries to make a major breakthrough. Therefore, it is difficult to meet the increasing requirements of practical applications for lithium-ion batteries. Safe and efficient metal lithium batteries will gradually replace lithium-ion batteries as the next generation of energy storage devices. The problem of dendrites is directly related to the safety of batteries, so finding an effective method to ...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 吴川吴锋袁颜霞白莹
Owner BEIJING INSTITUTE OF TECHNOLOGYGY