Power polymer lithium ion battery and fabricating process thereof

A lithium-ion battery and polymer technology, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as low bulk density and tap density, difficulty in coating positive electrode slurry, and slow diffusion of lithium ions. , to achieve the effect of high rate charge and discharge performance improvement, high rate performance improvement, uniform and full contact

Inactive Publication Date: 2009-10-28
ZHEJIANG ZHENLONG BATTERY
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AI Technical Summary

Problems solved by technology

[0003] Although the lithium iron phosphate power battery has many advantages mentioned above, it also has the following disadvantages: the electrical conductivity of the material is very low, which is not conducive to the reversible reaction, especially the high-rate discharge; the diffusion rate of lithium ions is slow; the synthesis of ideal LIFePO 4

Method used

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  • Power polymer lithium ion battery and fabricating process thereof
  • Power polymer lithium ion battery and fabricating process thereof
  • Power polymer lithium ion battery and fabricating process thereof

Examples

Experimental program
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Example Embodiment

[0033] Example one:

[0034] The manufacturing steps of Example 1 are roughly the same as the above-mentioned embodiments, except that the weight percentage of each component is determined. In the step 1, the modified lithium iron phosphate is 86.5%, KS-6 conductive agent 4%, and Super-p conductive agent 4%, Hypermer KD-1 dispersant 0.5%, mix, grind, dry, then add 5% of PVDFHSV900 positive electrode binder, then add 0.5% of Hypermer KD-1 dispersant and stir to prepare positive electrode slurry. The viscosity is 10000~15000mPa·s, and the slurry is coated on both sides of the aluminum foil. After drying at 110°C, roll pressing, and forming a pole piece with a thickness of 135μm after roll pressing, with a compacted density of 2.3g / cm 3 , Get the positive electrode sheet. In the second step, 95% of artificial graphite is added to the deionized water solution containing 8% of LA132 negative electrode binder to prepare negative electrode slurry. The viscosity of the slurry should be 20...

Example Embodiment

[0036] Embodiment two:

[0037]The manufacturing steps of the second embodiment are roughly the same as those of the first embodiment, but the difference is the weight percentage of each component of the positive electrode slurry. In the first step, the modified lithium iron phosphate 80%, the KS-6 conductive agent 8%, and the Super-p Conductive agent 2%, mix, grind, dry, add a colloid made by mixing 10% of 761PVDF positive electrode binder and NMP, and stir to prepare positive electrode slurry.

[0038] Such as image 3 Shown is the 1C charging and discharging cycle life of the power polymer lithium-ion battery of Example 2 of the present invention. After testing, the charging and discharging voltage is 2.2-3.8V, and the discharge is at 1C. The discharge platform is 3.2V, the battery capacity is about 4300mAh, and the cycle is 450. The weekly capacity retention rate was 91.3%.

[0039] By comparing the first embodiment with the second embodiment, it can be found that the weight pe...

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Abstract

The invention discloses a power polymer lithium ion battery and a fabricating process thereof. A positive plate comprises modified lithium iron phosphate, conductive agent, positive adhering agent, dispersant and positive current collector. A negative plate comprises graphite, conductive agent, negative adhering agent and negative current collector. The fabricating process comprises the following steps: firstly, dispersing the conductive agent; secondly, dispersing the modified lithium iron phosphate; thirdly, adding the efficient organic adhering agent so as to increase the adhering property among grains of the conductive agent, between the conductive agent and the positive material, and between the conductive agent and the positive material and the current collector, and to increase the electrode contact conductivity and electron conductivity, thereby greatly improving the battery high-rate charge and discharge property. The invention has the advantages of simple process, easy control, good product safety and long circulation service life.

Description

technical field [0001] The invention relates to the field of lithium ion battery and its manufacturing process, in particular to a power type polymer lithium ion battery and its manufacturing process. Background technique [0002] With the development of modern technology, especially modern transportation, problems such as energy shortage and environmental pollution have gradually emerged, and people's demand for new energy is becoming more and more urgent. Lithium-ion batteries are the most promising alternative to meet this demand. The current commercialized lithium-ion battery cathode materials are LiCoO 2 , LiMn 2 o 4 Wait. LiCoO 2 Due to problems such as high price and poor safety, its application in power equipment is hindered; while LiMn 2 o 4 The cycle performance, especially the poor high temperature performance, limits its practical application. As a new generation of lithium-ion battery cathode material, LiFePO4 has become the focus of research on lithium-...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M4/02H01M4/58H01M4/62H01M4/66H01M4/04
CPCY02E60/122Y02E60/10
Inventor 周雨方王定华刘为胜
Owner ZHEJIANG ZHENLONG BATTERY
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