CN-121674757-B - High-conductivity high-uniformity 1060 aluminum foil for lithium iron phosphate battery anode current collector

CN121674757BCN 121674757 BCN121674757 BCN 121674757BCN-121674757-B

Abstract

The invention relates to a high-conductivity high-uniformity 1060 aluminum foil for a lithium iron phosphate battery anode current collector, and belongs to the technical field of battery aluminum foil processing. The aluminum foil metal ingredients are smelted and cast-rolled into blanks, the blanks are subjected to cold continuous rolling and foil rolling to obtain 1060 aluminum foil with high conductivity and high uniformity, and the preparation raw materials of the aluminum foil metal ingredients comprise, by weight, 99.6-99.75% of aluminum, 0.05-0.1% of Al-Fe alloy, 0.05-0.08% of Al-Si alloy, 0.01-0.05% of Al-Cu alloy, 0.01% of Al-Mn alloy, 0.01% of magnesium, 0.02% of zinc, 0.01-0.02% of Al-Ti alloy and the balance of unavoidable impurities. In addition, the air cushion type continuous heat treatment in the foil rolling process can comprehensively ensure the component uniformity, the tissue uniformity and the thickness uniformity of the aluminum foil and effectively reduce the rejection rate of subsequent processing.

Inventors

HAO CHENGGANG
ZENG RUI
FENG ENLANG
ZHAO MAOMI
XIANG JING
GAN WEIJIANG
YANG XI
NONG YANLI
QIN YIMING
WANG YOUBIN
WANG ZHONGMIN
SU LIPING
DING RONGHUI
LI JIGANG
WEI YUEPING
LIN RUIDING
XU ZEBING
LU KECHENG

Assignees

广西国潮铝业有限公司

Dates

Publication Date: 20260508
Application Date: 20260210

Claims (4)

1. The high-conductivity high-uniformity 1060 aluminum foil for the lithium iron phosphate battery anode current collector is characterized in that the high-conductivity high-uniformity 1060 aluminum foil is obtained by smelting and casting aluminum foil metal ingredients into a blank, and cold continuous rolling and foil rolling the blank; the aluminum foil metal ingredients comprise, by weight, 99.6-99.75% of aluminum, 0.05-0.1% of Al-Fe alloy, 0.05-0.08% of Al-Si alloy, 0.01-0.05% of Al-Cu alloy, 0.01% of Al-Mn alloy, 0.01% of magnesium, 0.02% of zinc and 0.01-0.02% of Al-Ti alloy, and the balance of unavoidable impurities; Wherein, the iron content of the Al-Fe alloy is 20 percent by mass, the balance is aluminum, the silicon content of the Al-Si alloy is 50 percent, the balance is aluminum, the copper content of the Al-Cu alloy is 50 percent, the balance is aluminum, the manganese content of the Al-Mn alloy is 10 percent, the balance is aluminum, the titanium content of the Al-Ti alloy is 5 percent, and the balance is aluminum; the cold continuous rolling process comprises the steps of cold continuous rolling a blank, wherein cold continuous rolling passes are distributed, namely, the first pass is rolled from 7.5-8.5mm to 4.5-6.5mm, the second pass is rolled from 4.5-6.5mm to 3.6-4.2mm, the third pass is rolled from 3.6-4.2mm to 2.3-3.1mm, and the fourth pass is rolled from 2.3-3.1mm to 1.3-1.8mm, so that a cold rolled blank is obtained; the foil rolling process comprises the steps of cleaning a cold rolled blank in a cleaning machine, soaking the cold rolled blank in 5-8% sodium hydroxide aqueous solution at 50-60 ℃ for 5min, soaking the cold rolled blank in 3-5% nitric acid aqueous solution at 25-30 ℃ for 3min after water washing, and performing cold continuous rolling after hot air drying at 80-90 ℃ for distribution of the steps of rolling from 1.3-1.8mm to 0.7-0.9mm in a first pass, performing air cushion type continuous heat treatment on the cold rolled blank from 0.7-0.9mm in the second pass, rolling from 0.7-0.9mm to 0.4-0.6mm in the third pass, rolling from 0.4-0.6mm to 0.28-0.35mm in the third pass, rolling from 0.28-0.18 mm in the fourth pass, rolling from 0.12-0.18mm in the fifth pass, rolling from 0.07-0.09mm in the sixth pass, rolling from 0.07-0.09mm to 0.03-0.025 mm in the sixth pass, and annealing from 0.08-0.025 mm to 0.025mm in the fourth pass, and performing high-low-temperature annealing on the cold rolled blank from 0.08-0.08 mm to 0.025mm in the third pass; the specific process of the air cushion type continuous heat treatment is as follows: Feeding the cold rolled blank into an air cushion type continuous heat treatment furnace, introducing nitrogen with the flow of 5-10m < 3 >/h into the furnace, heating the cold rolled blank to 250-280 ℃ from room temperature, and preserving heat for 2-3min; keeping nitrogen in the furnace continuously to be introduced, simultaneously opening an air inlet valve of the protective gas, enabling the protective gas to enter the furnace at a flow rate of 3-5m < 3 >/h, heating the cold rolled blank to 380-410 ℃, and preserving heat for 10-30min; two-stage cooling is carried out on the cold-rolled blank, wherein the first stage is cooled to 200-220 ℃ at the cooling rate of 20-50 ℃ per minute, and the second stage is cooled to 20-30 ℃ at the cooling rate of 5-15 ℃ per minute; The specific steps of low-temperature annealing of the cold rolled blank of 0.018-0.025mm are that the cold rolled blank is heated to 280-320 ℃ from room temperature under the protection of nitrogen, and is kept for 5-6min, and is cooled to 20-30 ℃ at a cooling rate of 5-15 ℃ per min; The specific step of low-temperature annealing of the cold rolled blank of 0.008-0.012mm is that the cold rolled blank is heated to 250-280 ℃ from room temperature under the protection of nitrogen, and is kept for 5-6min, and is cooled to 20-30 ℃ at a cooling rate of 5-15 ℃ per min.
2. The high-conductivity and high-uniformity 1060 aluminum foil for the lithium iron phosphate battery anode current collector according to claim 1, wherein the aluminum foil metal ingredients are smelted and cast-rolled into blanks, and the specific process is as follows: Heating a smelting furnace to 680-700 ℃, firstly putting aluminum into the smelting furnace, adding Al-Fe alloy, al-Si alloy and Al-Mn alloy after the aluminum is completely melted, stirring the melt for 20-30min at 50-80r/min, cooling the smelting furnace to 670-690 ℃, adding Al-Cu alloy and zinc, stirring the melt for 10min at 50-80r/min, cooling the smelting furnace to 660-670 ℃, adding magnesium and refining agent, stirring the melt for 5min at 160r/min, adding Al-Ti alloy, and stirring the melt for 10min at 50-80r/min to obtain a melt; Argon is introduced into the melt obtained by smelting, the flow is 0.5-1L/min, the ventilation depth is up to the bottom of the smelting furnace, the ventilation time is 10-15min, the mixture is kept stand for 15-20min to remove scum, and the melt is cast-rolled to obtain a blank with the thickness of 7.5-8.5 mm.
3. The high-conductivity and high-uniformity 1060 aluminum foil for the lithium iron phosphate battery positive electrode current collector according to claim 2, wherein the refining agent is sodium hexafluoroaluminate, and the adding amount of the refining agent is 0.1-0.2% of the mass of the melt.
4. The aluminum foil of claim 1, wherein the shielding gas is 95-98% nitrogen and 2-5% hydrogen.

Description

High-conductivity high-uniformity 1060 aluminum foil for lithium iron phosphate battery anode current collector Technical Field The invention belongs to the technical field of battery aluminum foil processing, and particularly relates to a high-conductivity and high-uniformity 1060 aluminum foil for a lithium iron phosphate battery anode current collector. Background With the rapid development of the pure electric automobile industry, the market demand of aluminum foils for lithium iron phosphate batteries is rapidly increased, the aluminum foils mainly take 1060 aluminum alloy as a raw material, and in recent years, in order to improve the energy density of lithium ion batteries, a higher compaction density process is generally adopted in the industry, so that thinner and stronger performance requirements are provided for the aluminum foils; Currently, it is difficult to maintain an extremely thin thickness of the conventional battery aluminum foil while considering sufficient conductivity and uniformity of performance, plate shape, thickness and structure, and this short plate has affected the overall quality level of the lithium iron phosphate power lithium battery. Disclosure of Invention In order to solve the problems, the invention aims to provide the 1060 aluminum foil with high conductivity and high uniformity for the positive current collector of the lithium iron phosphate battery. The invention realizes the above purpose through the following technical scheme: The invention provides a high-conductivity high-uniformity 1060 aluminum foil for a lithium iron phosphate battery anode current collector, wherein the high-conductivity high-uniformity 1060 aluminum foil is obtained by smelting and cast-rolling aluminum foil metal ingredients into a blank, and cold continuous rolling and foil rolling the blank; The aluminum foil metal ingredients comprise, by weight, 99.6-99.75% of aluminum, 0.05-0.1% of Al-Fe alloy, 0.05-0.08% of Al-Si alloy, 0.01-0.05% of Al-Cu alloy, 0.01% of Al-Mn alloy, 0.01% of magnesium, 0.02% of zinc and 0.01-0.02% of Al-Ti alloy, and the balance of unavoidable impurities. The alloy comprises, by mass, 20% of iron content of an Al-Fe alloy, 50% of silicon content of an Al-Si alloy, 50% of aluminum content of an Al-Cu alloy, 10% of manganese content of an Al-Mn alloy, 5% of titanium content of an Al-Ti alloy, and the balance of aluminum. As a further optimization scheme of the invention, the specific process of smelting and cast rolling aluminum foil metal ingredients into blanks is as follows: Heating a smelting furnace to 680-700 ℃, firstly putting aluminum into the smelting furnace, adding Al-Fe alloy, al-Si alloy and Al-Mn alloy after the aluminum is completely melted, stirring the melt for 20-30min at 50-80r/min, cooling the smelting furnace to 670-690 ℃, adding Al-Cu alloy and zinc, stirring the melt for 10min at 50-80r/min, cooling the smelting furnace to 660-670 ℃, adding magnesium and refining agent, stirring the melt for 5min at 160r/min, adding Al-Ti alloy, and stirring the melt for 10min at 50-80r/min to obtain a melt; Argon is introduced into the melt obtained by smelting, the flow is 0.5-1L/min, the ventilation depth is up to the bottom of the smelting furnace, the ventilation time is 10-15min, the mixture is kept stand for 15-20min to remove scum, and the melt is cast-rolled to obtain a blank with the thickness of 7.5-8.5 mm. As a further optimization scheme of the invention, the refining agent is sodium hexafluoroaluminate, and the addition amount of the refining agent is 0.1-0.2% of the melt. As a further optimization scheme of the invention, the cold continuous rolling process is that the blank is subjected to cold continuous rolling, wherein cold continuous rolling passes are distributed from 7.5-8.5mm to 4.5-6.5mm, from 4.5-6.5mm to 3.6-4.2mm, from 3.6-4.2mm to 2.3-3.1mm, and from 2.3-3.1mm to 1.3-1.8 mm. As a further optimized scheme of the invention, the foil rolling process comprises the steps of continuously heat-treating a cold rolled blank with air cushion type from 1.3-1.8mm to 0.7-0.9mm, rolling from 0.7-0.9mm to 0.4-0.6mm in the first pass, annealing from 0.4-0.6mm to 0.28-0.35mm in the third pass, rolling from 0.28-0.35mm to 0.12-0.18mm in the fourth pass, rolling from 0.12-0.18mm to 0.07-0.09mm in the fifth pass, rolling from 0.07-0.09mm to 0.03-0.05mm in the sixth pass, annealing from 0.03-0.05mm to 0.018-0.025mm in the seventh pass at low temperature, annealing from 0.018-0.025mm to 0.008-0.012mm in the eighth pass, and annealing at high-temperature and uniform-conductivity of the aluminum foil. As a further optimization scheme of the invention, the specific process of the air cushion type continuous heat treatment is as follows: Feeding the cold rolled blank into an air cushion type continuous heat treatment furnace, introducing nitrogen with the flow of 5-10m < 3 >/h into the furnace, heating the cold rolled blank to 250-280 ℃ from room temperature,