Technical method for improving initial efficiency of lithium ion total battery

A full-battery and lithium-ion technology, which is applied in the field of improving the first-time efficiency of lithium-ion full-batteries, can solve problems such as lithium analysis and lithium metal safety hazards, achieve safe and reliable first-time efficiency, compensate for the loss of active lithium, and improve first-time efficiency Effect

Active Publication Date: 2018-01-19
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
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AI Technical Summary

Problems solved by technology

Although this method can also play the role of pre-lithiation of the negative electrode sheet, the thickness of the lithium sheet currently available on the market is about 45um, which is far beyond the amount that the negative electrode can absorb. Not only is there too much lithium metal in the battery There are potential safety hazards, and it is also easy to cause lithium precipitation in the cycle

Method used

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  • Technical method for improving initial efficiency of lithium ion total battery

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Effect test

Embodiment 1

[0016] (1) 5% of the quality of 622 nickel cobalt lithium manganese oxide in the material ratio of the positive pole piece is weighed to take Li 3 V 2 (PO 4 ) 3 The material is added to the positive electrode material, and the positive electrode sheet is made according to the normal mixing, coating, rolling, and cutting processes;

[0017] (2) The positive electrode sheet obtained in step (1) is discharged with metal lithium as the counter electrode, the lower limit of the control voltage is 1.2V, the active lithium of the negative electrode is inserted into the positive electrode, and the Li in the positive electrode sheet 3 V 2 (PO 4 ) 3 Materials intercalate lithium to obtain Li 3+x V 2 (PO 4 ) 3 (1≤x≤2);

[0018] (3) Under the -40 degree dew point environment, assemble the positive electrode sheet obtained in step (2) and the SiO / C composite negative electrode sheet with a gram capacity of 450mAh / g that meets the full battery design to form a full battery. At r...

Embodiment 2

[0020] (1) Weigh Li according to 12% of the NCA mass in the material ratio of the positive pole piece. 3 V 2 (PO 4 ) 3 The material is added to the positive electrode material, and the positive electrode sheet is made according to the normal mixing, coating, rolling, and cutting processes;

[0021] (2) The positive electrode sheet obtained in step (1) is discharged with metal lithium as the counter electrode, the lower limit of the control voltage is 1.2V, the active lithium of the negative electrode is inserted into the positive electrode, and the Li in the positive electrode sheet 3 V 2 (PO 4 ) 3 Materials intercalate lithium to obtain Li 3+x V 2 (PO 4 ) 3 (1≤x≤2);

[0022] (3) Under the -40 degree dew point environment, assemble the positive electrode sheet obtained in step (2) and the SiO / C composite negative electrode sheet with a gram capacity of 650mAh / g that meets the full battery design to form a full battery. At room temperature, charge and discharge for ...

Embodiment 3

[0024] (1) Weigh Li according to 3% of the LFP mass in the material ratio of the positive pole piece. 3 V 2 (PO 4 ) 3 The material is added to the positive electrode material, and the positive electrode sheet is made according to the normal mixing, coating, rolling, and cutting processes;

[0025] (2) The positive electrode sheet obtained in step (1) is discharged with metal lithium as the counter electrode, the lower limit of the control voltage is 1.2V, the active lithium of the negative electrode is inserted into the positive electrode, and the Li in the positive electrode sheet 3 V 2 (PO 4 ) 3 Materials intercalate lithium to obtain Li 3+x V 2 (PO 4 ) 3 (1≤x≤2);

[0026](3) Under the -40 degree dew point environment, assemble the positive pole piece obtained in step (2) and the negative pole piece of hard carbon negative electrode material with a gram capacity of 400mAh / g that satisfies the design of the full battery to form a full battery. At room temperature,...

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Abstract

The invention discloses a technical method for improving initial efficiency of a lithium ion total battery. Li<3>V<2>(PO<4>)<3> is added to a positive electrode active material based on a certain ratio to obtain a positive electrode plate; and an electrode is discharged by metal lithium, and the voltage lower limit is controlled to be 1.2V to enable the Li<3>V<2>(PO<4>)<3> material to be embeddedwith lithium to obtain Li<3+x>V<2>(PO<4>)<3> (x is greater than or equal to 1 and less than or equal to 2). The positive electrode plate in an empty electric state and a negative electrode with low initial efficiency are assembled to form a total battery; the charging and discharging voltage range is controlled; in the initial charging process, x-unit active lithium de-intercalated from the Li<3+x>V<2>(PO<4>)<3> is embedded into the negative electrode; in re-discharging, the voltage lower limit is controlled to be 2V or above to enable the x-unit active lithium not to be embedded in the positive electrode, so that active lithium loss caused by the secondary reaction of the initial charging negative electrode can be overcome, thereby improving the initial efficiency of the lithium ion totalbattery; the Li<3>V<2>(PO<4>)<3> has electrochemical performance in the normal total battery charging-discharging range, without influencing capacity utilization of the positive electrode material; and by virtue of the technical method, the initial efficiency and the cycle performance of the lithium ion total battery are improved effectively.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a technical method for improving the primary efficiency of lithium-ion full batteries. technical background [0002] As a green new energy technology, lithium-ion battery has very important and broad application prospects. With the wide application of lithium-ion batteries, the market has put forward higher demands. At the end of 2015, in the "13th Five-Year" new energy vehicle pilot special project issued by the Ministry of Science and Technology, it is required that by 2020, the specific energy of lithium-ion power batteries in my country will reach 300Wh / kg, and even 350Wh / kg. At present, a new generation of high specific energy lithium-ion batteries is a research hotspot. The requirement of high energy density requires the use of high specific capacity anode materials or composite materials of high capacity anodes and traditional graphite anodes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/058H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 杨茂萍杨尘
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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