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Fast charge ternary material positive pole piece and lithium ion battery comprising same

A technology of ternary materials and positive pole pieces, which is applied in the direction of electrode carriers/collectors, non-aqueous electrolyte battery electrodes, electrical components, etc., can solve the problem of fast charging performance deviation, poor cycle performance, and poor rate performance of ternary positive electrode materials and other issues, to achieve the effect of increasing energy density, improving first-time efficiency, and avoiding the difference in lithium ion concentration

Inactive Publication Date: 2017-08-18
江苏元景锂粉工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at defects such as poor rate performance, fast charging performance deviation and poor cycle performance of ternary positive electrode materials used in current lithium-ion batteries, one of the purposes of the present invention is to prepare a battery with good rate performance by supplementing lithium on the positive electrode sheet. , good cycle performance and high energy density ternary positive pole piece, and applied to lithium-ion batteries

Method used

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  • Fast charge ternary material positive pole piece and lithium ion battery comprising same
  • Fast charge ternary material positive pole piece and lithium ion battery comprising same
  • Fast charge ternary material positive pole piece and lithium ion battery comprising same

Examples

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Effect test

Embodiment 1

[0026] 1) Slurry preparation:

[0027] Add 15g of lithium metal powder, 30g of polymethyl methacrylate, and 50g of graphene into 500g of NMP solvent, and mix evenly to obtain a lithium-supplementing slurry;

[0028] Weigh 5g polyvinylidene fluoride and add it to 150g NMP solvent to disperse evenly, then add 2g graphene conductive agent, 93gLiNi 3 co 5 mn 2 o 2 Ternary material, and stirring to obtain active material slurry;

[0029] 2) Preparation of positive composite pole piece:

[0030] In an environment with a dew point ≤ -30°C, the active material slurry is coated on a 20 μm mesh aluminum foil by a coating machine, and the coating thickness is 150 μm. After drying, a pole roll A is obtained. The slurry is coated on the surface of the pole coil A (thickness is 8μm), after drying, the pole coil B is obtained, and then the pole coil is cut into pole pieces and transferred to a tube furnace. Nitrogen gas, and then methane gas was introduced, and the temperature was rais...

Embodiment 2

[0032] 1) Slurry preparation:

[0033] Add 10g of lithium metal powder, 30g of polyethyl methacrylate, and 60g of graphene into 500g of NMP solvent, and mix evenly to obtain a lithium-supplementing slurry;

[0034] Weigh 2g polyvinylidene fluoride and add it to 150g NMP solvent to disperse evenly, then add 3g carbon nanotube conductive agent, 95gLiNi 6 co 2 mn 2 o 2 Ternary material, and stirring to obtain active material slurry;

[0035] 2) Preparation of positive composite pole piece:

[0036] In an environment with a dew point ≤ -30°C, the active material slurry is coated on a 10μm mesh aluminum foil by a coating machine, and the coating thickness is 100μm. After drying, a pole roll A is obtained. The material is coated on the surface of pole roll A (the coating thickness is 5 μm). After drying, the pole roll B is obtained. After that, the pole roll is cut into pole pieces and transferred to a tube furnace. Through the chemical vapor phase method, first pass Nitrogen ...

Embodiment 3

[0038] 1) Slurry preparation:

[0039] Add 20g of lithium metal powder, 40g of polybutylmethacrylate, and 40g of graphene into 500g of NMP solvent, and mix evenly to obtain a lithium-supplementing slurry;

[0040] Weigh 8g polyvinylidene fluoride and add it to 150g NMP solvent to disperse evenly, then add 2g super carbon black conductive agent, 90gLiNi 8 co 1 mn 1 o 2 Ternary material, and stirring to obtain active material slurry;

[0041] 2) Preparation of positive composite pole piece:

[0042] In an environment with a dew point ≤ -30°C, the active material slurry is coated on a 30 μm mesh aluminum foil by a coating machine, and the coating thickness is 200 μm. After drying, a pole roll A is obtained. The material is coated on the surface of the pole roll A with a coating thickness of 10 μm. After drying, the pole roll B is obtained, and then the pole roll is cut into pole pieces and transferred to a tube furnace. Nitrogen gas, then acetylene gas was introduced, and t...

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Abstract

The invention discloses a fast charge ternary material positive pole piece and a lithium ion battery comprising the same. The fast charge ternary material positive pole piece is characterized in that the positive pole piece is of a laminate structure, wherein a base layer is a mesh aluminum foil current collector, a ternary material composite layer, a lithium supplementary layer and a carbon layer are arranged in turn from inside to outside. The composite positive pole piece provided by the invention utilizes a characteristic of high porosity of the mesh current collector to shorten the transmission distance of lithium ions during charging and discharging processes, lithium compounds in the lithium supplementary layer provide sufficient lithium ions for the charging and discharging processes of batteries, and the rate performance of the material is improved depending on characteristics of high electrical conductivity of graphene and large current carried by the graphene; and in the outermost layer, a carbon nanotube is deposited on the inside and the surface of the lithium supplementary layer by vapor deposition, the transmission rate of electrons is improved, direct contact between the material and electrolytic solution is avoided, and occurrence of side reaction of the material is reduced, so that the first efficiency, the rate performance and the cycle performance of the material are improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery preparation, in particular to a fast-charging ternary positive electrode and a lithium-ion battery. Background technique [0002] With the rapid development of electric vehicles, digital products and their mobile electric tools, the lithium-ion batteries used in these products are required to have the ability of fast charging to facilitate people's use, and at the same time cause less damage to lithium-ion batteries or modules. The current fast-charging lithium-ion battery, that is, the rate-type lithium-ion battery, is mainly realized by using fast-charging electrolyte, rate-type positive and negative electrode materials, and reducing the surface density of the pole piece, such as the patent (CN105489857A) Disclosed is a lithium-ion battery for fast charging, which is mainly realized by using modified graphite and its functional electrolyte. The lithium-ion battery prepared by it has a charging...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/64H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/13H01M4/362H01M4/583H01M4/625H01M4/667H01M10/0525Y02E60/10
Inventor 黄国林王建琴
Owner 江苏元景锂粉工业有限公司
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