Lithium sulfur battery charge and discharge management method

A charge-discharge management, lithium-sulfur battery technology, applied in battery over-discharge protection, charge-maintenance charge/discharge, battery over-charge protection, etc. The effect of narrowing the charge-discharge voltage window

Active Publication Date: 2015-05-06
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 dec

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 charge and discharge management method which includes: during lithium sulfur battery charge and discharge, timely detecting the capacity and voltage of lithium sulfur batteries; in each charge and discharge circulation of lithium sulfur batteries, controlling the reduction degree of the capacity of the lithium sulfur batteries relative to that of the lithium sulfur batteries at beginning of a charge and discharge circulation within 40%; controlling the voltage of the lithium sulfur batteries between an upper charge limit threshold and a lower charge limit threshold. The invention further discloses a repair method of the lithium sulfur batteries. The lithium sulfur battery charge and discharge management method and the repair method can effectively improve the charge and discharge stability of the lithium sulfur batteries and prolong the service lives of the lithium sulfur batteries.

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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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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