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A kind of application method of battery with lithium-rich manganese-based solid solution material as positive electrode

A lithium-rich material, lithium-rich manganese-based technology, used in secondary batteries, secondary battery charging/discharging, secondary battery repair/maintenance, etc. Effect

Active Publication Date: 2016-05-11
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ChongminWang et al. (FormationoftheSpinelPhaseintheLayeredCompositeCathodeUsedinLi-IonBatteries.ACSnano,2013,760-767.) studied Li 1.2 Ni 0.2 mn 0.6 o 2 Structural changes of materials during cycling, using AlF 3 After cladding, the process of voltage decay can only be delayed by dozens of cycles, but it cannot stop this process

Method used

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  • A kind of application method of battery with lithium-rich manganese-based solid solution material as positive electrode
  • A kind of application method of battery with lithium-rich manganese-based solid solution material as positive electrode
  • A kind of application method of battery with lithium-rich manganese-based solid solution material as positive electrode

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Experimental program
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Effect test

Embodiment 1

[0032] Lithium-rich material 0.5Li 2 MnO 3 0.5Li(Co 0.33 mn 0.33 Ni 0.33 )O 2 Assembled into a lithium-ion battery.

[0033] The lithium-ion battery is activated by electrochemical cycling for 5 cycles between 2.0-4.6V.

[0034] The activated battery is electrochemically cycled between 2.0-4.4V for use.

[0035] Use an electrochemical tester to test the cycle performance of the lithium-ion battery. The test temperature is 25°C and the charge-discharge current is 50mA / g. The charge-discharge cycle curve is obtained as follows: figure 1 shown, figure 2 is the corresponding average voltage curve. Depend on figure 1 It can be seen that the battery assembled from the lithium-rich manganese-based positive electrode material in Example 1 has a discharge capacity of 228.4mAh / g in the 2.0-4.4V charge and discharge range in the 6th cycle after 5 cycles of 2.0-4.6V activation, and the 105th cycle The capacity was maintained at 200.0mAh / g. The average discharge voltage is calc...

Embodiment 2

[0037] The lithium-rich material 0.3Li 2 MnO 3 0.7Li(Co 0.33 mn 0.33 Ni 0.33 )O 2 Assembled into a lithium-ion battery.

[0038] The lithium-ion battery is activated by electrochemical cycling for 5 cycles between 2.5-5.0V.

[0039] The activated battery was electrochemically cycled between 2.0-4.48V and used. The capacity of the sixth cycle reached 260.1mAh / g, and the capacity of the 105th cycle remained at 246.7mAh / g. After 105 cycles, the voltage decays from 3.5823 in the 6th cycle to 3.5245V, with an average decay of 0.5780mV per cycle.

Embodiment 3

[0041] Lithium-rich material 0.5Li 2 MnO 3 0.5Li(Co 0.2 mn 0.3 Ni 0.5 )O 2 Assembled into a lithium-ion battery.

[0042] The lithium-ion battery is activated by electrochemical cycling for 10 cycles between 2.0-4.7V.

[0043] The activated battery was electrochemically cycled between 2.0-4.2V for use. After 105 cycles, the voltage decayed from 3.5166V in the 6th cycle to 3.5124V, with an average decay of 0.0420mV per cycle.

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Abstract

The invention provides an application method of a battery utilizing a lithium-rich manganese-based solid solution material as a positive electrode. The method comprises the following steps: performing electrochemical charging and discharging activation treatment on the battery utilizing the lithium-rich manganese-based solid solution material as the positive electrode; performing charging and discharging circulation on the activated battery, wherein the cut-off voltage of the battery subjected to charging and discharging circulation is less than the charge cut-off voltage during the activation treatment. According to the method provided by the invention, the lithium-rich manganese-based solid solution material releases full capacity by virtue of activating, a layer structure is transformed into a spinel structure quickly, and then the battery can be subjected to charging and discharging circulation in a mild condition, and the material still has higher capacity under a lower charging cut-off voltage. Meanwhile, in the mild condition, the un-removed lithium ion plays a role in supporting the structure, so that the lithium-rich manganese-based solid solution material keeps a stable structure in the process of electrochemical cycling, without obvious voltage falling, and thus voltage attenuation is restrained effectively.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an application method of batteries using lithium-rich manganese-based solid solution materials as positive electrodes. Background technique [0002] Lithium-ion battery is a new type of chemical power source, which was born in the early 1990s. At present, lithium-ion batteries have monopolized the market of mobile phones and notebook computers. At the same time, their applications in military and aerospace fields are gradually increasing, and they can be seen everywhere in fields such as military communications, torpedoes, submarines, missiles, flying astronomy, and lunar exploration. In the fields of electric tools, electric vehicles (EV / PHEV / HEV), and energy storage, lithium-ion batteries have become the most competitive candidate products, and electric vehicles and energy storage have become the largest potential markets for lithium-ion batteries in the future. [0003] A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44
CPCH01M10/446Y02E60/10
Inventor 魏臻夏永高刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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