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Ultra-high magnification lithium ion battery

A technology of lithium-ion battery and multiplier, which is applied in secondary batteries, circuits, electrical components, etc.

Inactive Publication Date: 2009-08-19
XIAN SAFTY ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, common products can be continuously discharged at 10C~20C, but with the continuous development of car model, aircraft model, and ship model technology, 10C~20C or even 25C can no longer meet the special requirements of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Taking the manufacturing process of 2500~5000mAh ultra-high rate lithium-ion battery as an example to illustrate, the battery structure is as follows: figure 1 (a) shown. Implement as follows:

[0024] The preparation of positive electrode slurry: N-dimethylpyrrolidone (NMP) was used as solvent, and the active material was modified porous spherical lithium cobaltate (LiCoO 2 ), the conductive agent is super conductive carbon black (Super P) and vapor grown carbon fiber (VGCF), and the addition ratio of NMP is between 40% and 65%. The ratio used in this example is: LiCoO 2 :Super P:VGCF:PVDF:NMP=90:3:2:5:60. First LiCoO 2 , Super P, and VGCF are pre-dispersed by ball milling in a ball mill, so that the conductive agent is evenly dispersed in LiCoO 2 Particle surface; then add PVDF to NMP, stir for 2-4 hours, add the treated positive electrode mixture into PVDF peptizer three times, stir at high speed for 6-8 hours, then vacuumize to remove air bubbles and wait for c...

Embodiment 2

[0032] In this example, the positive and negative electrode formula, electrolyte, separator, and tabs are the same as in Embodiment 1, but the preparation method of the positive and negative electrode slurry is not consistent with Embodiment 1. The preparation of positive electrode slurry adopts the formula in Embodiment 1. Add PVDF to NMP and stir for 2 to 4 hours; then add VGCF to PVDF glue and stir for 3 to 4 hours; then add Super P to the above mixture and stir for 2 ~3h; finally LiCoO 2 After adding and stirring evenly, vacuumize to remove air bubbles, and the post-process production is the same as that of Embodiment 1 to complete the positive electrode sheet production.

[0033] For the preparation of negative electrode slurry, add CMC to deionized water and stir for 3-4 hours; then add Super P to CMC glue and stir for 3-4 hours; then add MCMB to the above mixture and stir for 4-6 hours; finally, add SBR After adding and stirring evenly, evacuate to remove air bubbles, ...

Embodiment 3

[0035] The preparation method of the positive and negative electrode formulations, electrolyte, diaphragm, and tabs of this embodiment is consistent with that of Embodiment 1, but the current collection method of the positive and negative electrodes is inconsistent with Embodiment 1. Embodiment 2 The pole piece adopts the middle collector of single-side single-pole lug respectively (such as figure 2 As shown in (b), same-side double-pole current collection (such as figure 2 (c) shown), different side bipolar tab current collection (such as figure 2 (d) shown). The positive and negative electrode sheets of the above-mentioned shape are stacked and assembled in the order of separator, negative electrode, separator, positive electrode, separator, and negative electrode to make a battery (specifically as follows: figure 1 (b), 1(c), and 1(d) shown), the post-process production is the same as that of Embodiment 1 to complete the production of the battery.

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Abstract

The invention discloses a lithium ion battery with superhigh multiplying power, which comprises a positive plate, a negative plate, a membrane, an electrolyte solution, a plate lug and a packing shell. The positive plate is manufactured by coating the mixed slurry of a positive active material, a conducting agent and a cementing agent on both sides of an aluminium foil; the negative plate is manufactured by coating the mixed slurry of a negative active material, the conducting agent and the cementing agent on both sides of a copper foil; and the electrolyte solution is a mixed solution of lithium and an organic solvent. The lithium ion battery is capable of discharging continually at a superhigh multiplying power and the discharge multiplying power can reach 35C-50C. The discharge capacity of the discharge multiplying power at 35C, 40C, 45C, 50C can respectively reach 96.3 percent, 95.6 percent, 95.1 percent and 94.5 percent of the discharge capacity at 1C.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a lithium-ion battery capable of continuous discharge under ultra-high rate conditions. Background technique [0002] Since its commercialization in 1990, lithium-ion batteries have been rapidly used in various modern mobile communication devices and portable electronic devices due to their advantages such as light weight, high specific energy, high working voltage, long life, and low self-discharge. Lithium-ion batteries The industry has developed rapidly. The above-mentioned electronic equipment has the characteristics of low working current and long service time, and general lithium-ion batteries can meet the requirements. [0003] With the continuous update and development of technology, the market's requirements for mobile electronic devices are also increasing. For example, car models, aircraft models, ship models and other fields used other batteries or pet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40
CPCY02E60/122Y02E60/10
Inventor 杨洪李峰何显峰
Owner XIAN SAFTY ENERGY TECH
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