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Loose type secondary battery of lithium ion

A secondary battery, lithium ion technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of accelerating the high temperature capacity decay rate, reducing the overall performance of the battery, shortening the battery life, and improving the cycle performance. , The effect of improving the internal cycle performance of the battery and reducing the decay rate

Active Publication Date: 2009-01-21
YUNNAN NENGTOU HUILONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a certain limit to high capacity and high energy density after all. If you want to use high-capacity batteries to provide power, there are currently many problems
High-capacity batteries release more electric energy in a short period of time during use, which will inevitably increase the temperature of the battery; the larger the battery capacity, the more gas will be generated by the electrolyte decomposition reaction during use, and the increase in gas will It has a greater impact on the battery cycle performance, thereby accelerating the rate of high-temperature capacity decay and reducing the overall performance of the battery
It also shortens the battery life

Method used

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  • Loose type secondary battery of lithium ion
  • Loose type secondary battery of lithium ion
  • Loose type secondary battery of lithium ion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The present invention is achieved in the following manner. The positive electrode material of the battery is made of 80% multi-component lithium manganese oxide as the positive electrode active material, 10% conductive agent acetylene, and 10% binder PTFE emulsion. The negative electrode of the battery is a lithium sheet, and the electrolyte is 1mol / 1LiPF 6 EC:DEC:DMC (volume ratio 1:1:1) organic electrolyte; the diaphragm is made of a composite film of microporous polypropylene / polyethylene / polypropylene; charged at 0.2C to 4.35V constant voltage for 2 hours, 0.2C discharge to 3.0V. The first discharge capacity at room temperature reaches 126.1molAh / g, the lowest 100 cycle capacity at room temperature is only 5.54%, the first discharge capacity at 55°C high temperature reaches 118.51molAh / g, the lowest 100 cycle capacity at 55°C is only attenuated by 8%, and is packaged with aluminum foil Material (1); seal with polyethylene, and leave a redundant space (4) of 0.5% of...

Embodiment 2

[0019] The present invention can also be implemented in the following manner, the positive electrode material adopts LiCoO 2 ; The negative electrode of the battery uses carbon nanotubes; the electrolyte uses LiPF 6 / (PC+DMC); PVDF is used as the binder; polyolefin is used as the separator; aluminum foil is used as the packaging material (1); sealed with polyethylene, 2.5% of the battery volume is left between the aluminum foil and the battery element during the packaging process Redundant space (4). A hard case (5) can be installed outside the loose type lithium ion secondary battery.

Embodiment 3

[0021] The present invention can also be implemented in the following manner, the positive electrode material adopts LiMn 2 o 4 ; The negative electrode of the battery is made of SnO 2 ; Electrolyte using LiPF 6 / (PC+EC+BL); PTFE (polytetrafluoroethylene) is used as the adhesive; polyolefin is used as the separator; aluminum foil is used as the packaging material (1); it is sealed with polyethylene. During the packaging process, the aluminum foil and the battery element are sealed A redundant space of 5% of the battery volume is left between them (4). A hard case (5) can be installed outside the loose type lithium ion secondary battery.

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Abstract

Aluminum foil as packaging material is adopted in the loose type lithium ion secondary battery. Aluminum foil possesses features of lightweight, outstanding processability, low cost, simple processing technique so as to be able to produce batteries in different shapes and capacities to meet needs of market. Redundancy space is retained in packaging procedure for gas produced from reaction of electrolyte inside battery to be diffused to the space. The redundancy space can improve cycle performance, reduce rate of decay of capacity in high temperature so as to stabilize performance and prolong service life of battery. It is particular for battery with large capacity to retain a redundancy space. Using polyethylene seals battery. Thus, when pressure inside battery increases to a certain extent, the seal will cracks so as not to cause explosion. Features are: safety, convenience, environmental protection, and high recovery rate especially, in procedure for treating deposes batteries.

Description

technical field [0001] The invention relates to a secondary battery, in particular to a loose lithium ion secondary battery. technical background [0002] With the rapid development of electronic information technology, people's demand for lithium-ion secondary batteries is also increasing, and the resulting waste batteries are also increasing. However, the most common lithium-ion secondary battery usually uses a rigid metal can made of metal such as SUS as the casing material. As a result, the potential safety hazards of waste batteries have increased during the process of being discarded by people. For example, when waste batteries are thrown into fire by children or mixed with other garbage for collective incineration without separation, it is easy to cause an explosion. Therefore how to solve the potential safety hazard that metal cans do the waste battery that housing material exists has become a big problem that puzzles people. [0003] In recent years, the lithium-i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M2/08H01M2/02H01M10/0525H01M50/119H01M50/193
CPCY02E60/122H01M10/0525Y02E60/10
Inventor 杨永平杨绍林杨成云
Owner YUNNAN NENGTOU HUILONG TECH