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Lithium-sulfur battery charging and discharging management method

A charge and discharge management, lithium-sulfur battery technology, applied in battery over-discharge protection, charging maintenance charge/discharge, battery overcharge protection, etc., can solve lithium-sulfur battery capacity fluctuations, attenuation, shorten battery cycle life and other problems, to achieve Effect of Narrowing the Charge-Discharge Voltage Window

Active Publication Date: 2017-03-15
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This deep charge and discharge method makes the capacity of lithium-sulfur batteries fluctuate greatly and will continue to decay, and because it is always at the threshold voltage, more irreversible reactions will occur, shortening the battery cycle life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 The initial voltage of the lithium-sulfur battery is 2.4V, the capacity is 1000mAh / g, the upper limit of the charging voltage is 2.7V, and the lower limit of the charging voltage is 1.6V. The charging and discharging procedure is to start discharging from the initial voltage of 2.4V. When the discharge capacity reaches the set value of 900mAh / g, the discharge stops and starts charging. When the charging capacity reaches the set value of 900mAh / g, the charging ends and enters the discharge state again. So cycle. If the voltage reaches 1.6V or 2.7V during charging and discharging, the capacity setting value is changed to 800mAh / g, 700mAh / g, 600mAh / g, and 500mAh / g in sequence.

Embodiment 2

[0022] Example 2 The initial voltage of the lithium-sulfur battery is 2.4V, the capacity is 1000mAh / g, the upper limit of the charging voltage is 2.7V, and the lower limit of the charging voltage is 1.6V. The charging and discharging procedure is to start discharging from the initial voltage of 2.4V. When the discharge capacity reaches the set value of 900mAh / g, the discharge stops and starts charging. When the charging capacity reaches the set value of 900mAh / g, the charging ends and enters the discharge state again. So cycle. If the voltage reaches 1.6V or 2.7V during the charging and discharging process, the capacity setting value is changed to 810mAh / g, 730mAh / g, 660mAh / g, and 590mAh / g in sequence.

Embodiment 3

[0023] Example 3 After 300 cycles of lithium-sulfur battery, the capacity decays from 1000mAh / g to 500mAh / g. The battery was charged to 3.8V at 0.05C, and then discharged cyclically at 0.2C, and the capacity recovered to 700mAh / g.

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PUM

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Abstract

The invention discloses a lithium-sulfur battery charging and discharging management method, which includes detecting the capacity and voltage of the lithium-sulfur battery in real time during the charging and discharging process of the lithium-sulfur battery, and during each cycle of charging and discharging of the lithium-sulfur battery, Control the decrease in the capacity of the lithium-sulfur battery relative to the capacity of the lithium-sulfur battery at the beginning of the charge-discharge cycle within 40%, and at the same time control the voltage of the lithium-sulfur battery between a charging upper threshold and a discharging lower threshold . Furthermore, the present invention also discloses a repair method for the lithium-sulfur battery. The method of the invention can effectively improve the charging and discharging stability of the lithium-sulfur battery and prolong its service life.

Description

technical field [0001] The invention relates to a lithium battery charging and discharging method, in particular to a novel lithium battery charging and discharging method capable of improving the charging and discharging stability of a lithium-sulfur battery and prolonging its service life. Background technique [0002] The life of lithium-sulfur batteries is closely related to the charging and discharging methods, and a good charging method can increase the cycle stability and cycle life of lithium-sulfur batteries. At present, most of the charging and discharging methods of constant current and constant voltage are used. The working process is: in the initial stage of charging, constant current charging is carried out. Voltage charging, when the constant voltage charging current is small to a certain extent (for example, when the constant current charging current is 50mA, the constant voltage end condition is 5mA or 1mA), the charging ends; and when the battery is dischar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
CPCH02J7/00302H02J7/00306H02J7/0069H02J7/0086
Inventor 张跃钢丘勇才侯远李桂珠刘美男周莉莎李宛飞
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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