Method of manufacturing lithium-ion secondary battery and method of evaluating lithium-ion secondary battery

Patent metadata

Field	Value
Publication number	US-2018183091-A1
Application number	US-201615735791-A
Country	US
Kind code	A1
Filing date	Jun 15, 2016
Priority date	Jul 1, 2015
Publication date	Jun 28, 2018
Grant date	—

Abstract

A method of manufacturing a lithium-ion secondary battery of the present invention includes at least four steps as follows: an initial charging step of charging the lithium-ion secondary battery, which has not been subjected to initial charging, under a temperature environment ranging of equal to or higher than −20° C. and equal to or lower than 15° C.; an aging step of leaving the lithium-ion secondary battery under a temperature environment ranging of equal to or higher than 30° C. and equal to or lower than 80° C. after the initial charging step; a short circuit detecting step of detecting the presence or absence of a short circuit of the lithium-ion secondary battery by measuring a voltage drop quantity of the lithium-ion secondary battery and comparing the voltage drop quantity with a reference value; and a sorting step of sorting out a lithium-ion secondary battery in which no short circuit is detected.

First claim

1 . A method of manufacturing a lithium-ion secondary battery comprising:
an initial charging step of charging the lithium-ion secondary battery, which has not been subjected to initial charging, under a temperature environment ranging of equal to or higher than −20° C. and equal to or lower than 15° C.; an aging step of leaving the lithium-ion secondary battery under a temperature environment ranging of equal to or higher than 30° C. and equal to or lower than 80° C. after the initial charging step; a short circuit detecting step of detecting the presence or absence of a short circuit of the lithium-ion secondary battery by measuring a voltage drop quantity of the lithium-ion secondary battery and comparing the voltage drop quantity with a reference value; and a sorting step of sorting out a lithium-ion secondary battery in which no short circuit is detected.

2 . The method of manufacturing a lithium-ion secondary battery according to claim 1 ,
wherein (T 2 −T 1 ) is equal to or higher than 30° C. when an ambient temperature in the initial charging step is set to T 1 [° C.] and an ambient temperature in the aging step is set to T 2 [° C.].

3 . The method of manufacturing a lithium-ion secondary battery according to claim 1 ,
wherein the aging step is performed without carrying out charging and discharging even once after the initial charging step.

4 . The method of manufacturing a lithium-ion secondary battery according to claim 1 ,
wherein a voltage of the lithium-ion secondary battery when the aging step starts is equal to or higher than 3.80 V.

5 . The method of manufacturing a lithium-ion secondary battery according to claim 1 ,
wherein in the aging step, the lithium-ion secondary battery is left for equal to or longer than two days.

6 . The method of manufacturing a lithium-ion secondary battery according to claim 1 ,
wherein the lithium-ion secondary battery is subjected to discharging after the aging step, and the voltage of the lithium-ion secondary battery in the short circuit detecting step is set to range of equal to or higher than 2.5 V and equal to or lower than 3.8 V.

7 . The method of manufacturing a lithium-ion secondary battery according to claim 1 ,
wherein viscosity of an electrolytic solution in the lithium-ion secondary battery in the initial charging step is equal to or higher than 6.0 mPa·s.

8 . The method of manufacturing a lithium-ion secondary battery according to claim 7 ,
wherein viscosity of an electrolytic solution in the lithium-ion secondary battery in the aging step is equal to or lower than 4.5 mPa·s.

9 . A method of evaluating a lithium-ion secondary battery comprising:
a charging step of charging the lithium-ion secondary battery under a temperature environment ranging of equal to or higher than −20° C. and equal to or lower than 15° C.; an aging step of leaving the lithium-ion secondary battery under a temperature environment ranging of equal to or higher than 30° C. and equal to or lower than 80° C. after the charging step; and a short circuit detecting step of detecting the presence or absence of a short circuit of the lithium-ion secondary battery by measuring a voltage drop quantity of the lithium-ion secondary battery and comparing the voltage drop quantity with a reference value.

10 . The method of evaluating a lithium-ion secondary battery according to claim 9 ,
wherein (T 2 −T 1 ) is equal to or higher than 30° C. when an ambient temperature in the charging step is set to T 1 [° C.] and an ambient temperature in the aging step is set to T 2 [° C.].

11 . The method of evaluating a lithium-ion secondary battery according to claim 9 ,
wherein the aging step is performed without carrying out charging and discharging even once after the charging step.

12 . The method of evaluating a lithium-ion secondary battery according to claim 9 ,
wherein a voltage of the lithium-ion secondary battery when the aging step starts is equal to or higher than 3.80 V.

13 . The method of evaluating a lithium-ion secondary battery according to claim 9 ,
wherein in the aging step, the lithium-ion secondary battery is left for equal to or longer than two days.

14 . The method of evaluating a lithium-ion secondary battery according to claim 9 ,
wherein the lithium-ion secondary battery is subjected to discharging after the aging step, and the voltage of the lithium-ion secondary battery in the short circuit detecting step is set to range of equal to or higher than 2.5 V and equal to or lower than 3.8 V.

15 . The method of evaluating a lithium-ion secondary battery according to claim 9 ,
wherein viscosity of an electrolytic solution in the lithium-ion secondary battery in the charging step is equal to or higher than 6.0 mPa·s.

16 . The method of evaluating a lithium-ion secondary battery according to claim 15 ,
wherein viscosity of an electrolytic solution in the lithium-ion secondary battery in the aging step is equal to or lower than 4.5 mPa·s.

17 . A method of manufacturing a lithium-ion secondary battery comprising:
an initial charging step of charging the lithium-ion secondary battery, which has not been subjected to initial charging, under a condition in which viscosity of an electrolytic solution is equal to or higher than 6.0 mPa·s; an aging step of leaving the lithium-ion secondary battery under a condition in which viscosity of an electrolytic solution is equal to or lower than 4.5 mPa·s after the initial charging step; a short circuit detecting step of detecting the presence or absence of a short circuit of the lithium-ion secondary battery by measuring a voltage drop quantity of the lithium-ion secondary battery and comparing the voltage drop quantity with a reference value; and a sorting step of sorting out a lithium-ion secondary battery in which no short circuit is detected.

18 . The method of manufacturing a lithium-ion secondary battery according to claim 17 ,
wherein the aging step is performed without carrying out charging and discharging even once after the initial charging step.

19 . The method of manufacturing a lithium-ion secondary battery according to claim 17 ,
wherein a voltage of the lithium-ion secondary battery when the aging step starts is equal to or higher than 3.80 V.

20 . The method of manufacturing a lithium-ion secondary battery according to claim 17 ,
wherein in the aging step, the lithium-ion secondary battery is left for equal to or longer than two days.

21 . The method of manufacturing a lithium-ion secondary battery according to claim 17 ,
wherein the lithium-ion secondary battery is subjected to discharging after the aging step, and the voltage of the lithium-ion secondary battery in the short circuit detecting step is set to range of equal to or higher than 2.5 V and equal to or lower than 3.8 V.

22 . A method of evaluating a lithium-ion secondary battery comprising:
a charging step of charging the lithium-ion secondary battery under a condition in which viscosity of an electrolytic solution is equal to or higher than 6.0 mPa·s; an aging step of leaving the lithium-ion secondary battery under a condition in which viscosity of an electrolytic solution is equal to or lower than 4.5 mPa·s after the charging step; and a short circuit detecting step of detecting the presence or absence of a short circuit of the lithium-ion secondary battery by measuring a voltage drop quantity of the lithium-ion secondary battery and comparing the voltag

Assignees

• Nec Energy Devices Ltd

Inventors

• Ichikawa Tomoyuki
• Enomoto Shinsuke
• Iwata Naoyuki

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/42

  Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells (H01M10/60 takes precedence) · CPC title

• H01M10/0566

  Liquid materials · CPC title

• H01M10/058 Primary

  Construction or manufacture · CPC title

• G01R31/3865

  related to manufacture, e.g. testing after manufacture · CPC title