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High-powered lithium ferric phosphate dynamic battery, and preparation technique

A technology for lithium iron phosphate and power batteries, which is applied in high-power lithium iron phosphate power batteries and its manufacturing process belongs to the field of batteries, which can solve the problems of poor electrical conductivity and ion diffusion performance, low bulk density and tap density, and high battery current Discharge performance is poor and other problems, to achieve good electrochemical performance and processing performance, high-current discharge performance improvement, electrical conductivity and ion diffusion performance to improve the effect

Inactive Publication Date: 2007-05-09
GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although lithium iron phosphate power battery has a series of incomparable advantages of other materials, it also has some shortcomings, mainly in: 1. Pure LiFePO 4 The electrical conductivity and ion diffusion performance of the battery are poor, resulting in poor battery discharge performance at high currents; 2. LiFePO 4 The bulk density and tap density are relatively low, and it is not easy to process, which leads to difficulty in the coating of positive electrode slurry in the production process, and the battery capacity is low

Method used

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  • High-powered lithium ferric phosphate dynamic battery, and preparation technique
  • High-powered lithium ferric phosphate dynamic battery, and preparation technique
  • High-powered lithium ferric phosphate dynamic battery, and preparation technique

Examples

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Effect test

Embodiment 1

[0070] 1. Lithium iron phosphate (85%), carbon black (5%), and graphite (5%) are mixed and ground, dried and premixed, and made into positive electrode powder. Mix the mixed positive electrode powder with deionized water of acrylic polymer (5%) (F103 binder) to make a slurry with a viscosity between 6000 and 9000mPaS, and coat the slurry on the cable-stayed aluminum mesh After being dried at 110°C, the two sides are rolled and pressed to form a pole piece with a thickness of 200 μ and a compacted density of 2.2 g / cm 3 , to obtain the positive pole piece.

[0071] 2. Mix natural graphite (93%) with deionized water containing sodium carboxymethyl cellulose (2%) and styrene-butadiene rubber (5%) binder to make a slurry with a viscosity between 3000 and 5000mPaS. Apply the slurry evenly on both sides of the copper foil, dry it at 120°C, and then roll it to form a pole piece with a thickness of 120μ and a compacted density of 1.6g / cm 3 , to obtain the negative electrode sheet. T...

Embodiment 2

[0082] The steps and procedures described in Implementation 1 are used to prepare assembled batteries, the only difference is the positive electrode, according to the composition of lithium iron phosphate (82%), carbon black (5%), graphite (5%), and nanometer aluminum oxide (3%) Proportionally mixed and ground, the prepared positive electrode powder was mixed with deionized water of acrylic polymer (5%) (F103 binder) to make a slurry.

[0083] After testing, the charge and discharge voltage is 2.0-3.8V, discharge at 1C, the discharge platform is 3.2V, the battery capacity is about 3200mAh, and the capacity retention rate after 400 cycles is 93.8%. The battery can discharge 91.2% of its capacity at 10C.

[0084] As shown in Figure 5, the different current discharge curves of D-type batteries prepared in Example 2.

[0085] As shown in Figure 6, the preparation of Example 2 is a D-type battery 1C charge-discharge cycle life.

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Abstract

The dynamic battery includes shell, positive pole piece, negative pole piece, diaphragm, and electrolyte. Positive pole piece / negative pole piece are composed of afflux bodies of positive / negative poles in same size, and active materials painted on the afflux bodies respectively. Ion doped lithium iron phosphate is adopted as positive pole material, and canting pulled aluminum mesh is as afflux body of positive pole. Carbon black, graphite, and Nano Al2O3 are selected for conduction agent. Crylic acid - styrene polymer, and crylic acid - silica polymer are chosen for bonding agent of positive pole material. The invention simplifies technical procedure, paints pole pieces easily, and increases following performances greatly: conductivity, ionic diffusion capability, discharging large current, as well as apparent density and packed density.

Description

technical field [0001] The high-power lithium iron phosphate power battery and its manufacturing process of the present invention belong to the field of batteries, in particular to a lithium-ion secondary battery that provides driving energy for small and medium-sized electric tools, household electronic appliances, electric bicycles, electric motorcycles and electric vehicles . Background technique [0002] technical parameter Lead-acid batteries Nickel-cadmium batteries NiMH batteries Lithium Ion Battery Lithium cobaltate Lithium iron phosphate mass specific capacity Wh / Kg 30 45 60 110 80 volume specific energy Wh / l 86 129 202 250 220 Environmental adaptability pollute pollute pollution-free pollution-free pollution-free safe...

Claims

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Application Information

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IPC IPC(8): H01M4/64H01M4/62H01M4/48H01M4/58H01M4/02H01M4/04H01M10/04H01M10/40H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 高飞薛建军夏信德
Owner GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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