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Lithium battery and preparation method thereof

A lithium battery and lithium ion technology, applied in the field of electrochemical energy storage, can solve the problems of increasing graphite electrode impedance, poor safety, and low cycle efficiency.

Inactive Publication Date: 2016-07-13
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium metal, as a high energy density anode material (theoretical capacity of lithium metal is 3860mAh / g, and has the lowest electrode potential) is unanimously promising in emerging high energy storage battery systems such as lithium air and lithium sulfur, but the cycle efficiency Problems such as lower and poor safety have hindered its further promotion and application in the battery industry
However, under irregular charging and discharging methods, dendrites can still grow on the graphite surface, and increase the impedance of the graphite electrode and even cause the graphite structure to be damaged.
[0006] In summary, although there are many methods for protecting lithium dendrites, the protective effects are still unsatisfactory. Therefore, there is an urgent need in this field to develop a method that can simultaneously inhibit lithium dendrites and maintain low interface resistance on the electrode surface. Lithium battery and its preparation process

Method used

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preparation example Construction

[0118] The preparation method of the lithium battery of the present invention comprises the steps of:

[0119] (a-1) Provide positive electrode, negative electrode, separator, electrolyte and casing;

[0120] Wherein, the negative electrode contains or consists of the following negative electrode materials, the negative electrode material includes a support structure and a lithium ion / lithium metal storage layer coated on one side of the support structure, the lithium ion / lithium metal storage layer The layer contains ceramic oxide, carbon material and binder, the electrolyte contains a film-forming additive, and the film-forming additive forms a polymer interface protection layer on the lithium ion / lithium metal storage layer;

[0121] (a-2) Assembling the positive electrode, negative electrode, separator, electrolyte and casing to form the lithium battery.

[0122] In a preferred example, the assembly is performed under the protection of inert gas.

[0123] Wherein, the pr...

Embodiment 1

[0144] Preparation of Copper Foil Battery 1

[0145] a. Pre-dissolve polyimide with a mass ratio of 10% in N-methylpyrrolidone (NMP) solvent, and mix and stir in a magnetic stirrer for 3 hours to obtain a uniform slurry;

[0146] b. According to the mass ratio of 1:79:20 carbon material super dense high conductivity carbon black (Super-P), Al 2 o 3 powder and polyimide, adding solvent N-methylpyrrolidone (NMP) into the mixture and placed in a magnetic stirrer to mix and stir for 3 hours to obtain a uniform slurry.

[0147] c. Apply the slurry in step b evenly on the surface of copper foil, bake at 120°C for 12 hours in a vacuum environment, and cut into discs with a diameter of 16mm after natural cooling as a lithium ion / lithium metal storage layer. Negative pole piece.

[0148] d. Add hexamethylene diisocyanate (HDI) into the electrolyte at a content of 20 mmol / L, and mix well.

[0149] e. Lithium iron phosphate (LiFePO 4 ), polyvinylidene fluoride (PVdF) and special hig...

Embodiment 2-12

[0156] Preparation of Copper Foil Batteries 2-12

[0157]Repeat Example 1, the difference is: C: ceramic oxide: binder mass ratio and content of film-forming additives are shown in Table 1.

[0158] C in the embodiment 1-12 of table 1: ceramic oxide: the content of binder mass ratio and film-forming additive

[0159] Example

[0160] 10

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Abstract

The present invention relates to a lithium battery and a preparation method thereof, and specifically discloses a lithium battery, the lithium battery includes a positive electrode, a negative electrode, a separator, an electrolyte and a housing, the negative electrode contains a negative electrode material or comprises the following negative electrode material, the negative electrode material comprises a support structure and a lithium-ion / lithium metal storage layer coating one side of the support structure, the electrolyte contains a film-forming additive, and a polymer interface protective layer is formed by the film-forming additive on the lithium-ion / lithium metal storage layer. The present invention also discloses the preparation method of the lithium battery. The lithium battery prepared by the preparation method has excellent lithium metal storage function, can inhibit lithium metal dendritic growth, make electrode interface current density uniform in distribution, maintain electrodes surface low interface impedance and other series characteristics for optimization of electrode cycle efficiency and service life.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a lithium battery and a preparation method thereof. Background technique [0002] As efficient mobile energy storage devices, lithium-ion batteries and second-generation lithium metal batteries have been widely concerned and vigorously developed in the battery industry. Seek breakthroughs and development. [0003] Lithium metal, as a high energy density anode material (theoretical capacity of lithium metal is 3860mAh / g, and has the lowest electrode potential) is unanimously promising in emerging high energy storage battery systems such as lithium air and lithium sulfur, but the cycle efficiency Problems such as lower energy density and poor safety have hindered its further promotion and application in the battery industry. Through a large number of studies, it has been found that inhomogeneous lithium deposition occurs on the surface of lithium metal during battery...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/1391H01M10/058H01M10/056
CPCY02E60/10Y02P70/50
Inventor 彭哲周晶晶刘杨王德宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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