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Lithium iron phosphate battery positive electrode pulp, lithium iron phosphate battery using positive electrode pulp and preparation method thereof

A technology of lithium iron phosphate battery and cathode slurry, which is applied in battery electrodes, electrolyte storage battery manufacturing, secondary batteries, etc. high effect

Active Publication Date: 2010-10-27
SHENZHEN MOTTCELL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the above-mentioned problems in the prior art, the present invention aims at batching the positive electrode slurry in a water system, and provides a positive electrode slurry for a lithium iron phosphate battery, a lithium iron phosphate battery using the positive electrode slurry, and a preparation method thereof. The lithium iron phosphate active material in the positive electrode slurry is high in quality, the softness and adhesiveness of the battery positive electrode sheet after pressing are good, it is environmentally friendly and has good safety performance, and there are no obvious adverse phenomena such as water absorption, powder removal, and material dropout during the preparation process Appear

Method used

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  • Lithium iron phosphate battery positive electrode pulp, lithium iron phosphate battery using positive electrode pulp and preparation method thereof
  • Lithium iron phosphate battery positive electrode pulp, lithium iron phosphate battery using positive electrode pulp and preparation method thereof

Examples

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Effect test

Embodiment 1

[0060] A positive electrode slurry for a lithium iron phosphate battery is composed of the following weight fractions:

[0061] Lithium iron phosphate: 40%;

[0062] Conductive agent: 5% (Super-P);

[0063] Water based adhesive: 5% (LA132); and

[0064] Solvent: 50% (deionized water and ethanol mixed in equal volumes).

[0065] The above-mentioned positive electrode slurry is used to prepare a battery, thereby providing a lithium iron phosphate battery, comprising a casing, a cover, an electrolyte, and a battery cell wound by a positive electrode piece, a negative electrode piece and a separator paper, and the positive electrode of the battery is wound. The pole piece is coated with the positive electrode slurry described above.

[0066] The lithium iron phosphate battery is prepared according to the following steps:

[0067] (1) Slurry: dry mix the conductive agent and lithium iron phosphate for 1 hour; one stirring: add 5% solvent and stir for 0.5 hour; second stirring: ...

Embodiment 2

[0071] A positive electrode slurry for a lithium iron phosphate battery is composed of the following weight fractions:

[0072] Lithium iron phosphate: 45%;

[0073] Conductive agent: 5% (V7);

[0074] Water based adhesive: 5% (F105); and

[0075] Solvent: 45% (deionized water, isopropanol and N-methylpyrrolidone were mixed in a volume ratio of 5:3:2).

[0076] The above-mentioned positive electrode slurry is used to prepare a battery, thereby providing a lithium iron phosphate battery, comprising a casing, a cover, an electrolyte, and a battery cell wound by a positive electrode piece, a negative electrode piece and a separator paper, and the positive electrode of the battery is wound. The pole piece is coated with the positive electrode slurry described above.

[0077] The lithium iron phosphate battery is prepared according to the following steps:

[0078] (1) Slurry: dry mix the conductive agent and lithium iron phosphate for 2 hours; one stirring: adding 25% solvent, ...

Embodiment 3

[0082] A positive electrode slurry for a lithium iron phosphate battery is composed of the following weight fractions:

[0083] Lithium iron phosphate: 55%;

[0084] Conductive agent: 2% (Super-P, S-0, MA100, V7 and KS6 are mixed in equal parts by weight);

[0085] Aqueous binder: 3% (mix of sodium carboxymethyl cellulose and LA135 by weight 1:2); and

[0086] Solvent: 40% (deionized water and ethanol mixed in equal volumes).

[0087] The above-mentioned positive electrode slurry is used to prepare a battery, thereby providing a lithium iron phosphate battery, comprising a casing, a cover, an electrolyte, and a battery cell wound by a positive electrode piece, a negative electrode piece and a separator paper, and the positive electrode of the battery is wound. The pole piece is coated with the positive electrode slurry described above.

[0088] The lithium iron phosphate battery is prepared according to the following steps:

[0089] (1) Slurry: dry-mix the conductive agent...

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Abstract

The invention provides lithium iron phosphate battery positive electrode pulp, a lithium iron phosphate battery using the positive electrode pulp and a preparation method thereof. The positive electrode pulp consists of the following ingredients in percentage by weight: 40 to 55 percent of lithium iron phosphate, 2 to 5 percent of conductive agents, 3 to 5 percent of aqueous bonding agents and 40 to 55 percent of solvents. The battery comprises an electrode sheet coated with the positive electrode pulp. The aqueous positive electrode pulp of the invention greatly improves the positive electrode lithium iron phosphate active material amount, the electrode sheet of the positive electrode has friendly effect on the moisture, and adverse phenomena such as water absorption powder dropping, material dropping and the like can not occur, and the electrode sheet of the positive electrode has good softness and adhesive performance after tabletting, and has good effect in the cutting and conversion operation processes. The solvents in the positive electrode pulp relatively have environment protection effect, and the safety performance of the aqueous bonding agents is stable. The battery of the invention has good integrated performance, high discharging power, capability of fast charging and long circulation life. The preparation method of the battery has good pulp dispersion effect and coating effect.

Description

technical field [0001] The invention relates to the field of chemical energy materials, in particular to a lithium iron phosphate battery positive electrode slurry, a lithium iron phosphate battery using the positive electrode slurry, and a preparation method thereof. Background technique [0002] As an environmentally friendly high-performance rechargeable battery, lithium-ion batteries have been widely used in the fields of electronic products and communication tools. Among them, the olivine-shaped lithium iron phosphate (LiFePO 4 ) batteries have become the main force of the new generation of lithium-ion batteries due to their good thermal stability and cycle performance. [0003] Existing lithium iron phosphate (LiFePO 4 ) The positive electrode of the battery is mainly made of oil-based slurry, wherein the oil-based slurry is generally a system composed of a binder PVDF and a solvent N-methylpyrrolidone (NMP). However, in the actual production and use of the oil-base...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/62H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 陈明军
Owner SHENZHEN MOTTCELL NEW ENERGY TECH CO LTD
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