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Lithium ion battery positive plate capable of supplementing lithium and lithium ion battery

A technology for lithium-ion batteries and positive pole pieces, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve the problems of high reactivity, flammability, and splashing of metallic lithium, and improve cycle capacity Effects of retention rate, high energy density, and high first-time efficiency

Active Publication Date: 2017-10-13
安普瑞斯(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using lithium metal, the requirement for the dryness of the environment is high. Powdered lithium metal has a very high reactivity, is flammable, and is easy to splash. It is difficult to manufacture and process. Lithium metal may remain inside the battery, which may bring potential dangers in subsequent use. ;When using organolithium solution, the danger brought by the powder can be avoided, but organolithium is often more active, and often needs to be protected by an inert atmosphere during the manufacturing process and cannot be manufactured and processed in the air, and is also very sensitive to moisture. Difficult to be compatible with existing processes

Method used

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  • Lithium ion battery positive plate capable of supplementing lithium and lithium ion battery
  • Lithium ion battery positive plate capable of supplementing lithium and lithium ion battery

Examples

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Effect test

preparation example Construction

[0033] Preparation of positive electrode sheet:

[0034] (1) Comparative example:

[0035] The positive electrode active material lithium cobalt oxide (LCO) or lithium nickel manganese cobalt oxide (NCM), the binder polyvinylidene fluoride (PVDF) and the conductive agent Super-P are added to the N-formaldehyde according to the weight ratio in the positive electrode formula in the following table Stir and homogenize in NMP to make a positive electrode slurry; apply the positive electrode slurry on both sides of the positive electrode current collector, and obtain the positive electrode sheet after drying, compacting, slitting, cutting, and welding the tabs .

[0036] (2) Embodiment:

[0037] The positive electrode active material lithium cobalt oxide (LCO) or lithium nickel manganese cobalt oxide (NCM), binder polyvinylidene fluoride (PVDF), conductive agent Super-P and lithium supplement additives are added according to the weight ratio in the positive electrode formula in t...

Embodiment 20

[0066] The preparation method of the positive electrode sheet in Example 20: mix the particles of H, conductive carbon black, and PVDF binder, wherein the weight ratio of conductive carbon black is 0-5%, and the weight ratio of PVDF is 1-10%, Add to N-methylpyrrolidone (NMP) to stir and homogenize the additive slurry, and coat and dry the surface of the positive electrode current collector foil to form a thin film of H, and then coat the positive electrode slurry on top of this coating A thin film composed of H is deposited on the surface of the positive electrode current collector foil by vapor phase chemical deposition, and then the positive electrode slurry is coated on the coating. For other battery preparation steps, refer to the battery preparation instructions.

Embodiment 21

[0067] The preparation method of the positive electrode sheet in Example 21: First, refer to the steps in the battery production instructions to coat the positive electrode slurry on the positive electrode current collector on both sides. After drying, mix the particles with the component H, conductive carbon black, and PVDF binder. , wherein the weight ratio of conductive carbon black is 0 to 5%, and the weight ratio of PVDF is 1 to 10%, which is added to N-methylpyrrolidone (NMP) and stirred and homogenized to make additive slurry, and coated on the surface of the positive electrode Cover and dry to form a thin film of H. For other battery preparation steps, refer to the battery preparation instructions.

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Abstract

The invention discloses a lithium ion battery positive plate capable of supplementing lithium and a lithium ion battery containing this positive plate. This positive pate can provide the lithium source at the first charging, thereby placing the effect of compensating the lithium consumption when the positive and the negative form an SEI film, the first charging / discharging efficiency and the cycle performance are promoted, and the charging capacity and the energy density can be promoted, the lithium ion battery positive plate is especially suitable for the negative system with the low first charging / discharging efficiency, such as: the negative system containing silicon, silicon alloy, silicon oxide, or tin, tin alloy, and tin oxide.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to a lithium-ion battery positive pole piece capable of replenishing lithium [0002] And a lithium-ion secondary battery containing the positive electrode sheet. Background technique [0003] Lithium-ion secondary batteries have the advantages of high voltage and high energy density, and are widely used in power supplies for consumer electronics, energy storage systems, and power systems. Improving the energy density of lithium-ion batteries has always been the most concerned industry and academia question. [0004] During the first charging process of the battery, the surface solid electrolyte film (SEI film) formed on the surface of the positive and negative electrodes will consume lithium and irreversibly solidify lithium into lithium carbonate, alkoxide, ester salt, etc., resulting in a reversible loss of lithium. , reduce the first efficiency and redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M10/0525H01M10/42
CPCH01M4/131H01M10/0525H01M10/4242Y02E60/10
Inventor 翟传鑫徐子福张明慧
Owner 安普瑞斯(无锡)有限公司
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