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Negative-electrode-free lithium secondary battery

A lithium secondary battery and negative electrode technology, applied in the direction of lithium batteries, negative electrodes, battery electrodes, etc., can solve the problem of poor cycle of batteries without negative electrodes

Pending Publication Date: 2021-12-31
洛阳储变电系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium secondary battery without negative electrode, which not only avoids the safety risk caused by the use of metal lithium sheets in the battery manufacturing process, but also improves the problem of poor cycle of negative electrode batteries using traditional positive electrode materials

Method used

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  • Negative-electrode-free lithium secondary battery

Examples

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preparation example Construction

[0026] The preparation method of the above-mentioned non-negative electrode lithium secondary battery comprises the following steps:

[0027] 1) Preparation of the positive electrode: adding the above-mentioned lithium-containing material, a conductive agent and a binder whose first effect is less than 85% to the solvent, and mixing uniformly to obtain a positive electrode slurry; uniformly coating the positive electrode slurry on the positive electrode current collector, After drying, evenly coat the insulating coating slurry on the surface of the positive electrode with a thickness of 1-20 μm, and roll to obtain the positive electrode;

[0028] Preparation of insulating coating slurry: Dissolve a certain amount of binder in NMP, stir until transparent, add inorganic ceramic materials and an appropriate amount of NMP in a certain proportion, add a little dispersant and stir for 30 minutes, then add the above binder The binder glue was stirred for another 30 minutes;

[0029]...

Embodiment 1

[0040] The anode-free lithium secondary battery of this embodiment includes a cathode (1), an anode (2), a separator (3) and an electrolyte (4).

[0041] (1) Positive electrode

[0042] The positive electrode includes an active material layer coated on a positive electrode current collector and an insulating coating layer coated on the active material layer.

[0043] The active material layer is composed of a lithium-containing material whose first effect is less than 85%, a conductive agent and a binder. The lithium-containing material is LiNiO 2 , the conductive agent is carbon black. The binder is polyvinylidene fluoride (PVDF). Lithium-containing material LiNiO 2, The mass ratio of conductive agent carbon black to binder polyvinylidene fluoride (PVDF) is 95:2:3.

[0044] The insulating coating is mainly composed of inorganic ceramic materials and binders (the other components are a little dispersant), of which the inorganic ceramic materials SiO 2 Accounted for 93%, ...

Embodiment 2

[0060] The difference between the anode-free lithium secondary battery of this embodiment and that introduced in Embodiment 1 is that the positive active material is 0.7LiNi 0.5 mn 0.5 o 2 0.3 Li 2 MnO 3 , other unspecified points are the same as in Example 1.

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Abstract

The invention belongs to the field of lithium secondary batteries, and particularly relates to a negative electrode-free lithium secondary battery. The negative-electrode-free lithium secondary battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, wherein a positive electrode active material of the positive electrode is a lithium-containing material of which the first efficiency is lower than 85%. In the cycle process, rapid consumption of active lithium can cause low coulombic efficiency and relatively rapid capacity attenuation. In the invention, a positive electrode adopts a lithium-containing material with low first efficiency, lithium in the positive electrode material is migrated to the surface of a negative electrode copper foil during first charging, a lithium layer is formed on the surface of the copper foil, and lithium plating of the copper foil negative electrode is completed. Due to the low first effect of the positive electrode material, a large amount of irreversible lithium cannot migrate back to the surface of the positive electrode and is still on the negative electrode side, so that the negative electrode is equivalently supplemented with lithium, and the part of lithium can make up the consumption of reversible active lithium in the cycle process, thereby achieving the purpose of improving the coulombic efficiency and the cycle performance in the cycle process.

Description

technical field [0001] The invention belongs to the field of lithium secondary batteries, and in particular relates to a lithium secondary battery without negative electrodes. Background technique [0002] With the large-scale application and development of new energy electric vehicles, smart phones and other consumer electronic devices, higher requirements are placed on the lightweight and energy density of lithium batteries. According to the existing liquid lithium ion power battery composed of ternary and graphite as positive and negative electrode active materials, the weight energy density limit is about 280Wh / kg. Even after the introduction of silicon-based alloys instead of pure graphite as the anode material, the upper limit of energy density can only reach 300-350Wh / kg. [0003] Lithium metal is considered to be an ideal negative electrode material due to its extremely high theoretical gram capacity (3860mAh / g, about 10 times that of graphite) and low reduction pot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/052H01M4/02H01M4/134H01M4/66
CPCH01M10/058H01M10/052H01M4/02H01M4/134H01M4/661H01M2004/027Y02E60/10Y02P70/50
Inventor 怀永建余琦李肖肖刘吉云王赞霞
Owner 洛阳储变电系统有限公司
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