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Miniature lithium ion battery and preparation method thereof

A technology of ion battery and micro-lithium, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as shortening battery life and affecting battery performance, and achieve the effects of decreasing expansion coefficient, improving rate performance, and low OI value

Active Publication Date: 2021-04-16
ZHONGSHAN ZHONGWANGDE NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the fast charging technology for large-sized batteries is relatively mature, compared with large-sized batteries, due to the area ratio of the edge position of the unit pole piece of micro and non-cylindrical lithium-ion batteries, the area of ​​the edge position is relatively large, and the edge position is in the fast charging process , more prone to lithium precipitation and other phenomena, which will affect the performance of the battery and shorten the service life of the battery

Method used

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  • Miniature lithium ion battery and preparation method thereof
  • Miniature lithium ion battery and preparation method thereof
  • Miniature lithium ion battery and preparation method thereof

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Embodiment 1

[0138] The present embodiment provides a kind of miniature lithium ion battery and preparation method thereof, specifically comprises the following steps:

[0139] S1. Preparation of positive electrode sheet:

[0140] a. Add lithium cobaltate, conductive carbon black, and PVDF with a D50 particle size of 14 μm to 17 μm in a ratio of 100:1.5:1.5 to a double planetary mixer for pre-mixing for 30 minutes (15 Hz revolution, 4 Hz rotation) to obtain positive electrode solid powder;

[0141] b. Weigh NMP, the quality of NMP is 1 / 3 of the mass of the positive electrode solid powder; by mass, add NMP to the positive electrode solid powder three times: add 8% for the first time, stir for 60min (revolution 15HZ, rotation 4HZ) Add 40% for the second time, stir for 120min (revolution 30HZ, rotation 10HZ); add 52% for the third time, stir for 180min (revolution 30HZ, rotation 35HZ); finally vacuum reverse and stir for 30min for defoaming (revolution 10HZ), Obtain positive electrode slurry...

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Abstract

The invention provides a miniature lithium ion battery and a preparation method thereof. The miniature lithium ion battery has the thickness of 2.0-6.5 mm, the width of 7-14 mm, the height of 7-14 mm and the capacity of 13-90 mAh, and after 500 cycles of 3C charging / 1C discharging at 25 DEG C, the capacity retention ratio is greater than 93.99%. The miniature lithium ion battery provided by the invention has excellent quick charge cycle performance and high and low temperature performance, and can meet quick charge application under different temperature conditions.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a miniature lithium ion battery and a preparation method thereof. Background technique [0002] With the rapid development and maturity of smart mobile terminal technology, smart wearable devices have begun to enter people's work and life. In recent years, the functions of smart wearable devices have been gradually enriched, and their power consumption has gradually increased. Under the same battery capacity, the battery life of smart wearable devices has become shorter and shorter. This change has affected the user experience. Although the battery life can be improved by increasing the battery capacity, the shape of the smart wearable device itself limits the size of the body, which in turn restricts the battery capacity. Therefore, on the premise of not increasing the battery capacity, how to break through the battery life limit of smart wearable devi...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0587
CPCY02E60/10Y02P70/50
Inventor 陈伟姚卿敏李光耀林守伟
Owner ZHONGSHAN ZHONGWANGDE NEW ENERGY TECH CO LTD
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