Current collector for lithium ion battery, and lithium ion battery

A technology of lithium ion battery and current collector, applied in the field of lithium ion battery, can solve the problems of poor adhesion between current collector and active material, high application cost of lithium battery, poor conductivity of active material, etc., and achieves less use. Quantity, strong mechanical properties, and the effect of increasing mechanical properties

Active Publication Date: 2018-08-14
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current collectors used in lithium-ion batteries are usually light foil collectors and coated collectors. These two collectors mainly have the following defects: the bonding performance between the collector and the active material is poor, and the amount of binder used is large. As a result, the specific energy density of the battery is low and the conductivity of the active material is poor; the application cost of the lithium battery remains high, and the current collector accounts for a relatively high proportion of the manufacturing cost of the single cell

Method used

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  • Current collector for lithium ion battery, and lithium ion battery
  • Current collector for lithium ion battery, and lithium ion battery
  • Current collector for lithium ion battery, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0031] Embodiment 1 (existing light aluminum foil + light copper foil)

[0032] Negative electrode ingredients: configure graphite, binder, and deionized water as the negative electrode slurry according to the ratio of 97:3:120. After stirring at high speed for 20 hours, use a coating machine to coat the slurry on the bare copper foil with a thickness of 0.03mm. The surface coating, the thickness of the pole piece is 1.5mm after coating and drying, and the thickness of the pole piece obtained by rolling the pole piece after drying is about 0.3mm, and the light foil negative pole piece is obtained;

[0033] Positive electrode ingredients: configure lithium iron phosphate, conductive agent, PVDF binder, and NMP (N-methyl-2-pyrrolidone) as positive electrode slurry according to the ratio of 92:2:6:100. After stirring at high speed for 16 hours, use coating The machine evenly coats the positive electrode slurry on the light aluminum foil with a thickness of 0.05mm, double-sided co...

Embodiment approach 2

[0034] Embodiment 2 (existing woven aluminum foil + woven copper foil)

[0035] Select aluminum wire with a diameter of 0.03mm and copper wire with a diameter of 0.01mm to grow into a braided mesh current collector with a diameter of 10,000mm and a width of 150mm. The mesh is square, and the side length of the aluminum mesh is L 1 =0.15mm, copper mesh side length L 2 = 0.03. Mesh battery pole pieces with the same specifications are prepared according to the first coating method.

[0036] A 18650 circular battery is made by using the above-mentioned pole piece, separator, electrolyte, etc.

Embodiment approach 3

[0037] Embodiment 3 (existing perforated aluminum foil + perforated copper foil)

[0038] Select an aluminum foil with a thickness of 0.03mm and a copper foil with a thickness of 0.01mm, and use a punching method to uniformly punch holes in rows on the foil. The holes are round. The diameter of the aluminum foil hole is 0.03mm, and the diameter of the copper foil hole is 0.01mm. The perforated area accounts for 30% of the total foil area, and a perforated current collector with a length of 10,000 mm and a width of 150 mm is prepared. Pole pieces with the same specifications are prepared according to the first coating method.

[0039] A 18650 circular battery is made by using the above-mentioned pole piece, light foil negative pole piece, separator, electrolyte, etc.

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Abstract

The invention discloses a current collector for a lithium ion battery, and the lithium ion battery comprising the current collector. The existing current collector with a coating layer structure or anoptical foil structure is changed into a grid-like winding structure; the current collector comprises a single-layer or multi-layer grid-like structure formed by conductive metal wires in a winding manner; and metal wires adopted by a positive electrode current collector can be aluminum wires, titanium wires, and titanium aluminum alloy wires while the negative electrode adopts copper wires. Thewinding structure disclosed in the invention has multiple surfaces and can be in contact with an active material, so that the bonding surfaces of the active material and the current collector are enlarged, mutual gluing can be facilitated, relatively less dosage of a binder is adopted, the contact area between the active material and the current collector can be enlarged, and internal resistance is lowered; in addition, by virtue of the winding and uniformly-distributed grid-like structure, the mechanical property of the current collector is improved, the current collector can be more balancedin stress, and the processing difficulty is lowered; compared with a net-shaped structured and a punched hole-shaped current collector, the winding structure can provide higher mechanical property and has a larger contact area with the active material; and by virtue of matched application with titanium wires, the cycle performance of the battery is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery current collector and a lithium ion battery. Background technique [0002] Lithium-ion battery current collectors such as copper foil and aluminum foil. Its function is mainly to fix the active material of the battery on the current collector, and at the same time gather the micro-current generated by the active material for external output or provide the active material with an electrochemical reaction micro-current for internal input. Therefore, the current collector should be sufficiently bonded to the active material and tightly enough. [0003] The current collectors used in lithium-ion batteries are usually light foil collectors and coated collectors. These two collectors mainly have the following defects: the bonding performance between the collector and the active material is poor, and the amount of binder used is large. As a result, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/70H01M10/0525
CPCH01M4/66H01M4/70H01M10/0525Y02E60/10
Inventor 黄汉川相佳媛陈建
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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