Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF0 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 It is not easy, because it is necessary to prevent ferrous iron from being oxidized to ferric iron during synthesis; in practical applications, LIFePO 4 The main disadvantage is that its bulk density and tap density are relatively low, and it is not easy to process, which makes it difficult to coat the positive electrode slurry in the production process.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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
Comparison scheme
Effect test

Embodiment 1

[0034] The manufacturing steps of Example 1 are roughly the same as the above-mentioned embodiment, the difference is that the weight percentage of each component is determined. In the first step, 86.5% of modified lithium iron phosphate, 4% of KS-6 conductive agent, and 4% of Super-p conductive agent 4%, Hypermer KD-1 dispersant 0.5%, mixed grinding, drying, then add PVDFHSV900 positive electrode binder 5%, then add Hypermer KD-1 dispersant 0.5% and stir to make 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 to form a pole piece with a thickness of 135 μm and a compacted density of 2.3 g / cm 3 , to obtain the positive electrode sheet. In the step 2, add 95% of artificial graphite into the deionized aqueous solution containing 8% of LA132 negative electrode binder to make negative electrode slurry. The viscosity of the slurry should be 2000-3000mPa·s. Both sides of...

Embodiment 2

[0037]The manufacturing steps of the second embodiment are roughly the same as those of the first embodiment, except that the weight percentages of the components of the positive electrode slurry are 80% of the modified lithium iron phosphate, 8% of the KS-6 conductive agent, and 8% of the Super-p Conductive agent 2%, mixed grinding, drying, adding 761PVDF positive electrode binder 10% and colloid mixed with NMP, stirring to make 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 the second embodiment of the present invention. After testing, the charging and discharging voltage is 2.2-3.8V, and the discharge platform is 3.2V at 1C. The battery capacity is about 4300mAh, and the cycle is 450 The weekly volume retention rate was 91.3%.

[0039] Through the comparison of Example 1 and Example 2, it can be found that the percentage by weight of the conductive agent and the binder com...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Compaction densityaaaaaaaaaa
Compaction densityaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com