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Mixed type anode sizing agent and lithium battery using anode sizing agent

A positive electrode slurry and hybrid technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of high energy density of ion batteries, poor high-temperature cycle performance, rise in battery internal pressure, etc., and achieve specific capacity and specific energy Excellent, long cycle life, stable discharge platform effect

Inactive Publication Date: 2009-11-11
温岭市恒泰电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the lithium battery uses a mixture of quaternary materials and lithium cobalt oxide as the active material of the positive electrode of the battery, it solves the problem of using LiFePO 4 As a positive electrode material, the tap density is small, the prepared lithium battery has a large volume, and the defects of poor charge and discharge rate performance
However, due to the high price of metals such as Co, Ti, and Zr, the material cost is high; and because LiCoO 2 The ion battery has a high energy density. In the overcharged state, the battery temperature rises, the energy is surplus, and the internal pressure of the battery rises sharply, which may cause spontaneous combustion or explosion.
The unsafe overcharging of the produced battery also determines that it cannot be widely used in large-capacity batteries
[0004] LiMn, which is the active material of the positive electrode of the lithium battery, 2 o 4 Can rely on its cheap and relatively LiCoO 2 The advantage of safety comes into play in high-capacity batteries, but a single LiMn 2 o 4 Lithium batteries made as positive active materials have low capacity and poor high-temperature cycle performance, and have not been widely promoted in actual lithium batteries.

Method used

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  • Mixed type anode sizing agent and lithium battery using anode sizing agent
  • Mixed type anode sizing agent and lithium battery using anode sizing agent
  • Mixed type anode sizing agent and lithium battery using anode sizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as image 3 As shown in the flow chart of the production process for producing lithium batteries, the positive electrode material in Example 1 in Table 1 was stirred and mixed for 5 to 10 hours. After mixing, the viscosity of the positive electrode slurry was 1500±500mPaS, and the particles of the positive electrode slurry were less than 150 mesh . Stir and mix the negative electrode material according to Example 1 in Table 2 for 5-10 hours. After mixing, the viscosity of the negative electrode slurry is 2000±500 mPaS, and the particles of the negative electrode slurry are less than 120 mesh.

[0044] Select a pure aluminum foil with a thickness of 0.016±0.002mm and a length×width of (900±2)×(56.5±0.2)mm, evaporate the solvent of the positive electrode slurry after mixing in an oven, and then heat it at a constant temperature of 20°C Coated on pure aluminum foil, the coating surface density is 1.8±0.020g / 100cm 2 . Select a double-gloss copper foil with a thickne...

Embodiment 2～5

[0051] Mix according to the positive electrode materials of Examples 2-5 in Table 1 and the negative electrode materials of Examples 2-5 in Table 2, and the other process flow is the same as that of Example 1, and will not be repeated.

[0052] Table 1: The positive electrode material weight ratio (kg) of the lithium batteries of Examples 1-5

[0053]

[0054]

[0055] Wherein the conductive agent described in embodiment 1 is flake graphite; The described polar solvent is N-methylpyrrolidone.

[0056] Conductive agent described in embodiment 2 is conductive carbon black; Described polar solvent is dimethylformamide.

[0057] The conductive agent described in Example 3 is conductive carbon black; the polar solvent is N-methylpyrrolidone.

[0058] The conductive agent described in Example 4 is conductive carbon black and flake graphite, and the weight ratio between the two is 8:6; the polar solvent is dimethyl sulfoxide.

[0059] The conductive agent described in Example...

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Abstract

The invention relates to a mixed type anode sizing agent and a lithium battery using the anode sizing agent; the mixed type anode sizing agent of the lithium battery comprises the following components with parts by weight: 0.5 to 2 parts of LiFePO4, 0.5 to 2 parts of LiCo2, 0.05 to 0.2 part of conductive agent, 0.1 to 1.0 part of aqueous adhesive, 0.5 to 2 parts of deionized water and 0.05 to 0.25 part of polar solvent. The positive plate of the lithium battery is coated with aluminum foil of the mixed type anode sizing agent. The mixed type anode sizing agent of the lithium battery adopts LiFePO4 material and LiCoO2 material for compatibility production, and the produced lithium battery has better specific capacity and specific energy, high power, excellent safety performance, long circulation service life and low production cost, and can be popularized in the practical application of lithium battery, stable discharge plateau, low self-discharge, no memory effect and wide application.

Description

technical field [0001] The invention relates to a lithium battery positive electrode material and a lithium battery using the positive electrode material, in particular to a mixed positive electrode slurry and a lithium battery using the positive electrode slurry; belonging to the technical field of lithium batteries. Background technique [0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. Lithium batteries are generally composed of a positive electrode, a negative electrode, an electrolyte, a diaphragm, a positive electrode tab, a negative electrode tab, a central terminal, an insulating material, a battery case, and the like. According to different positive electrode materials, it can be divided into lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide and other batteries. Lithium iron phosphate (LiFePO 4 Lithium in ) is positive monovalent;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M10/36H01M10/40
CPCY02E60/122Y02E60/10
Inventor 张荣华
Owner 温岭市恒泰电池有限公司
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