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Lithium ion battery, negative electrode material, and method for improving low temperature discharging efficiency of lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unsatisfactory discharge efficiency of artificial graphite and natural graphite, and achieve the effect of improving low-temperature discharge efficiency and improving low-temperature performance.

Inactive Publication Date: 2011-10-12
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at low temperature, the discharge efficiency of artificial graphite and natural graphite is not ideal.

Method used

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  • Lithium ion battery, negative electrode material, and method for improving low temperature discharging efficiency of lithium ion battery
  • Lithium ion battery, negative electrode material, and method for improving low temperature discharging efficiency of lithium ion battery
  • Lithium ion battery, negative electrode material, and method for improving low temperature discharging efficiency of lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Make 7 sets of square batteries of the same model, with a capacity of 650mAh.

[0021] Among them, each group uses the same positive electrode material and the same electrolyte. The positive electrode materials are all adopted: active material lithium cobaltate, conductive agent acetylene black, binder PVDF, positive electrode solvent is N-methylpyrrolidone (NMP). The organic electrolytes are all used: the solvent is ethylene carbonate EC / diethyl carbonate DEC / propylene carbonate PC (the volume ratio of the three EC:DEC:PC is 2.5~3.5:3.5~4.5:0.03~0.06), lithium salt Choose LiPF 6 (The concentration is 1.0~1.3mol / L).

[0022] The negative electrode material is: the active material of each group of batteries is a mixture of five kinds of natural graphite and artificial graphite, as well as pure natural graphite and pure artificial graphite. The other formulas are the same for each group: thickener CMC, water-based binder SBR, negative electrode solvent is water.

[00...

Embodiment 2

[0028] Make 7 sets of square batteries of the same model, with a capacity of 650mAh.

[0029] Each group uses the same positive electrode material and the same electrolyte. The positive electrode materials are all adopted: active material lithium cobaltate, conductive agent acetylene black, binder PVDF, positive electrode solvent is N-methylpyrrolidone (NMP). The organic electrolytes are all used: the solvent is ethylene carbonate EC / diethyl carbonate DEC / propylene carbonate PC (the volume ratio of the three EC:DEC:PC is 2.5~3.5:3.5~4.5:0.03~0.06), lithium salt Choose LiPF 6 (The concentration is 1.0~1.3mol / L).

[0030] The negative electrode material is: the active material of each group of batteries is a mixture of five kinds of natural graphite and artificial graphite, and pure natural graphite and pure artificial graphite. The other formulas are the same for each group: thickener CMC, water-based binder SBR, negative electrode solvent is water.

[0031] After the cell ...

Embodiment 3

[0035] Make 7 sets of square batteries of the same model, with a capacity of 650mAh.

[0036] Among them, each group uses the same positive electrode material and the same electrolyte. The positive electrode materials are all adopted: active material lithium cobaltate, conductive agent acetylene black, binder PVDF, positive electrode solvent is N-methylpyrrolidone (NMP). The organic electrolytes are all used: the solvent is ethylene carbonate EC / diethyl carbonate DEC / propylene carbonate PC (the volume ratio of the three EC:DEC:PC is 2.5~3.5:3.5~4.5:0.03~0.06), lithium salt Choose LiPF 6 (The concentration is 1.0~1.3mol / L).

[0037] The negative electrode material is: the active material of each group of batteries is a mixture of five kinds of natural graphite and artificial graphite, as well as pure natural graphite and pure artificial graphite. The other formulas are the same for each group: thickener CMC, water-based binder SBR, negative electrode solvent is water.

[00...

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Abstract

The invention discloses a lithium ion battery, a negative electrode material thereof, a preparation method of the negative electrode material, and a method for improving the low temperature discharging efficiency of the lithium ion battery. The negative electrode material of the lithium ion battery is made by mixing natural graphite and artificial graphite according to a specific proportion, wherein the volume ratio of the natural graphite to the artificial graphite is 7.1:2.9-7.9:2.1. The low temperature discharging efficiency of the lithium ion battery can be improved, so the performance of the lithium ion battery at low temperature is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion battery manufacturing, in particular to a lithium-ion battery and its negative electrode material, a preparation method for the material, and a method for improving the low-temperature discharge efficiency of the lithium-ion battery. Background technique [0002] Due to the high energy density and portability of lithium-ion batteries, lithium-ion batteries have been active as energy carriers in the fields of communications, digital cameras, video cameras, and notebooks since their commercialization. In order to meet different conditions of use, more and more users have put forward higher requirements for the performance of the battery cell at low temperature, especially the discharge efficiency of the battery at low temperature, so as to ensure that the battery does not run at low temperature. Affect the normal work and needs of users. There are many factors that affect the low-temperature discharge ef...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M10/0525
CPCY02E60/10
Inventor 刘艳丽陈辉罗朝晖刘振国黑自阳
Owner SHENZHEN BAK BATTERY CO LTD