WO2016132444A1 - リチウムイオン二次電池の製造方法およびリチウムイオン二次電池 - Google Patents
リチウムイオン二次電池の製造方法およびリチウムイオン二次電池 Download PDFInfo
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- WO2016132444A1 WO2016132444A1 PCT/JP2015/054176 JP2015054176W WO2016132444A1 WO 2016132444 A1 WO2016132444 A1 WO 2016132444A1 JP 2015054176 W JP2015054176 W JP 2015054176W WO 2016132444 A1 WO2016132444 A1 WO 2016132444A1
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- Prior art keywords
- secondary battery
- lithium ion
- ion secondary
- charging
- exterior body
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 206
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 206
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 48
- 238000007600 charging Methods 0.000 claims abstract description 60
- 238000010248 power generation Methods 0.000 claims abstract description 25
- 239000008151 electrolyte solution Substances 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 59
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 239000011230 binding agent Substances 0.000 claims description 10
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 claims description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 229910052744 lithium Inorganic materials 0.000 abstract description 12
- 238000000151 deposition Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 54
- 238000007872 degassing Methods 0.000 description 28
- 239000007773 negative electrode material Substances 0.000 description 9
- 230000032683 aging Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000010280 constant potential charging Methods 0.000 description 6
- 238000010277 constant-current charging Methods 0.000 description 6
- 238000005470 impregnation Methods 0.000 description 5
- 239000007774 positive electrode material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- GWAOOGWHPITOEY-UHFFFAOYSA-N 1,5,2,4-dioxadithiane 2,2,4,4-tetraoxide Chemical compound O=S1(=O)CS(=O)(=O)OCO1 GWAOOGWHPITOEY-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 3
- 238000007429 general method Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 2
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 description 2
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 1
- 229910013290 LiNiO 2 Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910001872 inorganic gas Inorganic materials 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a method for producing a lithium ion secondary battery and a lithium ion secondary battery.
- Lithium ion secondary batteries that can be repeatedly charged and discharged have attracted attention as power sources for driving motors of electric vehicles (EV) and hybrid electric vehicles (HEV).
- a lithium ion secondary battery (cell) is configured by enclosing a power generation element in which a positive electrode and a negative electrode are stacked via a separator together with an electrolytic solution inside an exterior body.
- the degassing process of removing the gas existing inside the lithium ion secondary battery is performed (for example, Patent Document 1). According to the degassing step, it is possible to prevent the gas inside the lithium ion secondary battery from deteriorating the battery characteristics.
- an object of the present invention is to improve the battery capacity by preventing lithium metal from depositing on the surface of the negative electrode in the initial charging step of charging the lithium ion secondary battery to a fully charged state. It is providing the manufacturing method of a secondary battery.
- the method for producing a lithium ion secondary battery according to the present invention is a method for producing a lithium ion secondary battery in which a power generation element in which a positive electrode and a negative electrode are laminated via a separator is enclosed in an exterior body together with an electrolytic solution. Then, the lithium ion secondary battery is charged in the range where the cell voltage is 4.0 V or less.
- the method for producing a lithium ion secondary battery of the present invention opens the outer package of a lithium ion secondary battery charged in a range of 4.0 V or less, and discharges the gas inside the lithium ion secondary battery to the outside. Then, it is sealed again. And the manufacturing method of the lithium ion secondary battery of this invention charges the lithium ion secondary battery from which gas was discharged
- the lithium ion secondary battery of the present invention is a lithium ion secondary battery in which a power generation element in which a positive electrode and a negative electrode are laminated via a separator is enclosed in an exterior body together with an electrolytic solution.
- the ratio of the volume of organic gas present in the internal space to the volume of the internal space of the exterior body is 2% or more.
- FIG. 2 is a schematic sectional view taken along the line II-II ′ of FIG. 1.
- FIG. 1 is a perspective view showing an external appearance of the lithium ion secondary battery 10
- FIG. 2 is a schematic cross-sectional view taken along the line II-II 'of FIG.
- the lithium ion secondary battery 10 has a flat rectangular shape, and the positive electrode lead 11 and the negative electrode lead 12 are led out from the same end of the outer package 13.
- a power generation element 20 in which a charge / discharge reaction proceeds is accommodated in the exterior body 13 together with an electrolytic solution.
- the power generation element 20 has a configuration in which a positive electrode 21 and a negative electrode 22 are stacked with a separator 23 interposed therebetween.
- the positive electrode 21 has a positive electrode active material layer 25 formed on both surfaces of a sheet-like positive electrode current collector 24, and the negative electrode 22 has a negative electrode active material layer 27 formed on both surfaces of a sheet-like negative electrode current collector 26.
- the separator 23 is a sheet-like porous body and holds an electrolytic solution.
- the positive electrode 21, the separator 23, and the negative electrode 22 are laminated so that one positive electrode active material layer 25 and the negative electrode active material layer 27 adjacent thereto face each other with the separator 23 interposed therebetween.
- the number of stacked positive electrodes 21, separators 23, and negative electrodes 22 is appropriately determined in consideration of necessary battery capacity and the like.
- the positive electrode current collector 24 and the negative electrode current collector 26 are provided with a positive electrode tab and a negative electrode tab, respectively.
- the positive electrode tab and the negative electrode tab are attached to the positive electrode lead 11 and the negative electrode lead 12, respectively.
- the negative electrode active material is bound by an aqueous binder such as a styrene butadiene rubber (SBR) / carboxymethyl cellulose (CMC) mixed binder, and a conductive aid such as a carbon material is added as necessary.
- a polyolefin microporous membrane is used as the separator 23, and the electrolytic solution has a form in which a lithium salt such as LiPF 6 is dissolved in a mixed solvent of ethylene carbonate (EC) and diethyl carbonate (DEC). Yes.
- Electrolytic solution additives such as methylenemethane disulfonate (MMDS), vinylene carbonate (VC), and fluoroethylene carbonate (FEC) are added to the electrolytic solution.
- a laminate film having a three-layer structure in which polypropylene (PP), aluminum, and nylon (registered trademark) are laminated in this order is used.
- PP polypropylene
- nylon nylon
- the material of each member of the lithium ion secondary battery 10 is not limited to the above materials, and various materials are used.
- FIG. 3 is a flowchart showing a method for manufacturing a lithium ion secondary battery according to this embodiment.
- the manufacturing method of the lithium ion secondary battery according to the present embodiment includes an electrolyte injection process, a first impregnation process, a first roll treatment process, a precharge process, a second impregnation process, a degassing process, It has a 2nd roll processing process, an initial charge process, and an aging process.
- Step S12 the lithium ion secondary battery 10 obtained by sealing the outer package 13 is left for a predetermined time, and the power generation element 20 is impregnated with the electrolytic solution.
- step S13 the lithium ion secondary battery 10 is roll-pressed by a pressure roller, and the gas inside the power generation element 20 is moved to the outside of the power generation element 20.
- the lithium ion secondary battery 10 is charged in a range where the cell voltage is 4.0 V or less, and a gas (inorganic gas containing hydrogen as a main component) is formed inside the lithium ion secondary battery 10. Is generated. A detailed description of the precharging process will be described later.
- step S15 the precharged lithium ion secondary battery 10 is allowed to stand for a predetermined time (1 hour or more) to promote the impregnation of the electrolytic solution.
- step S16 the outer package 13 of the lithium ion secondary battery 10 is opened, and the gas inside the lithium ion secondary battery 10 is discharged to the outside. A detailed description of the degassing process will be described later.
- pre-charging is performed before the initial charging of the lithium ion secondary battery 10, and gas is generated inside the lithium ion secondary battery 10. . Then, the outer package 13 of the lithium ion secondary battery 10 is opened, and the gas accumulated in the lithium ion secondary battery 10 is discharged to the outside. Then, the outer package 13 is sealed again, and the lithium ion secondary battery 10 is charged for the first time. According to such a configuration, it is possible to prevent lithium metal from being deposited on the surface of the negative electrode 22 in the initial charging step.
- FIG. 4 is a diagram showing the relationship between the amount of gas generated inside the lithium ion secondary battery 10 and the charging voltage.
- the vertical axis in FIG. 4 is the volume change amount of the lithium ion secondary battery 10, and the horizontal axis is the charging voltage of the lithium ion secondary battery 10.
- the amount of gas generated inside the lithium ion secondary battery 10 is the same as that of the lithium ion secondary battery 10.
- the charging voltage exceeds 2.8V, a gas containing hydrogen as a main component starts to be generated inside the lithium ion secondary battery 10, and the generated amount of gas is maximum when the charging voltage is about 3.2V. become.
- the negative electrode 22 is removed in the initial charging step. Lithium metal can be prevented from precipitating on the surface.
- FIG. 5 is a diagram for explaining the operational effects of the method for manufacturing the lithium ion secondary battery 10 according to the present embodiment.
- FIG. 5A is a diagram showing a state of the lithium ion secondary battery in the method of manufacturing a lithium ion secondary battery according to the present embodiment.
- FIG. 5B is a diagram showing a state of a lithium ion secondary battery in a general method of manufacturing a lithium ion secondary battery as shown in FIG. 6 as a comparative example.
- a degassing step is performed after the precharging step and the initial charging step.
- the gas bubbles 41 generated in the precharge process reduce the area of the negative electrode active material layer 27 in which the battery reaction proceeds in the initial charge process, and local in the initial charge process. Rapid charging occurs.
- the lithium metal 42 is deposited on the surface of the negative electrode active material layer 27 and the battery capacity is reduced.
- the gas generated in the pre-charging step is a gas containing hydrogen as a main component, and is generated, for example, by decomposing a hydroxyl group contained in the aqueous binder of the negative electrode active material.
- the charger 50 starts constant current charging of the lithium ion secondary battery 10 (step S101). More specifically, the charger 50 sets the charging current to a predetermined current value (for example, 0.2 C / s) and starts constant current charging of the lithium ion secondary battery 10.
- a predetermined current value for example, 0.2 C / s
- the charger 50 determines whether or not the cell voltage of the lithium ion secondary battery 10 has reached the first voltage value (step S102).
- the first voltage value is a predetermined voltage value of 2.8 V or less (for example, 2.7 V), and the SEI (solid electrolyte interface) film is formed without generating gas in the lithium ion secondary battery 10. Is a voltage value that can be formed.
- step S102 NO
- the charger 50 waits until the cell voltage reaches the first voltage value.
- the charger 50 determines whether or not a predetermined time has elapsed (step S104). When it determines with predetermined time not having passed (step S104: NO), the charger 50 waits until predetermined time passes.
- step S104 when it is determined that the predetermined time has elapsed (step S104: YES), the charger 50 starts constant current charging of the lithium ion secondary battery 10 (step S105). More specifically, the charger 50 sets the charging current to a predetermined current value (for example, 0.3 C / s) and starts constant current charging of the lithium ion secondary battery 10.
- a predetermined current value for example, 0.3 C / s
- step S106 NO
- the charger 50 waits until the cell voltage reaches the second voltage value.
- step S106 when it is determined that the cell voltage has reached the second voltage value (step S106: YES), the charger 50 starts constant voltage charging of the lithium ion secondary battery 10 (step S107). More specifically, the charger 50 sets the charging voltage to the second voltage value and starts constant voltage charging of the lithium ion secondary battery 10.
- step S108 when it is determined that the predetermined time has passed (step S108: YES), the charger 50 stops charging (step S109) and ends the process.
- the lithium ion secondary battery 10 is charged by the constant current-constant voltage charging method until the cell voltage reaches the first voltage value of 2.8 V or less. The Thereafter, the lithium ion secondary battery 10 is charged by the constant current-constant voltage charging method until the cell voltage reaches the second voltage value of 4.0 V or less. According to such a configuration, first, the lithium ion secondary battery 10 is charged until the cell voltage reaches the first voltage value, so that the electrolyte solution is generated without generating gas inside the lithium ion secondary battery 10.
- the SEI film can be formed on the surface of the negative electrode 22 by decomposing the additive. That is, the SEI film can be uniformly formed on the surface of the negative electrode 22.
- the SEI film starts to be formed and is not formed at about 2.7V. Furthermore, referring to FIG. 4 again, no gas is generated inside the lithium ion secondary battery 10 at a cell voltage of 2.8 V or less.
- the cell voltage of the lithium ion secondary battery 10 is charged to the first voltage value of 2.8 V or less without generating gas.
- An SEI film can be formed on the surface of the negative electrode 22.
- the lithium ion secondary battery 10 is charged to a second voltage value of 4.0 V or less to generate gas inside the lithium ion secondary battery 10 on which the SEI film is formed. Can be made.
- the pressure roller 60 roll-presses the exterior body 13 from the inner peripheral end 13 a of the exterior body 13 toward the outer peripheral end 20 a of the power generation element 20, and the excess portion 131. Is moved to the center of the outer package 13.
- a gas vent hole 132 is formed between the inner peripheral end 13 a of the outer package 13 and the outer peripheral end 20 a of the power generation element 20 to open the outer package 13 and perform gas venting.
- a dedicated gas vent hole forming device (not shown) first forms a slit-like gas vent hole 132 at a predetermined position of the exterior body 13. Then, the lithium ion secondary battery 10 in which the gas vent holes 132 are formed is placed in the decompression chamber 70, and the gas accumulated in the lithium ion secondary battery 10 is discharged.
- FIG. 14 is a flowchart showing the procedure of the initial charging process performed by the charger 50.
- step S202 NO
- the charger 50 waits until the cell voltage reaches the third voltage value.
- step S203 when determining that the cell voltage has reached the third voltage value (step S202: YES), the charger 50 starts constant voltage charging of the lithium ion secondary battery 10 (step S203). More specifically, the charger 50 sets the charging voltage to the third voltage value and starts constant voltage charging of the lithium ion secondary battery 10.
- step S204 when it is determined that the predetermined time has elapsed (step S204: YES), the charger 50 stops charging (step S205) and ends the process.
- the lithium ion secondary battery 10 is charged by the constant current-constant voltage charging method until the cell voltage reaches the third voltage value larger than 4.0V. .
- organic gas is generated inside the lithium ion secondary battery 10 in the aging process after the initial charging process.
- the ratio of the volume of the organic gas to the volume of is 2% or more.
- FIG. 15 is a diagram showing the ratio of the organic gas accumulated in the lithium ion secondary battery 10.
- the ratio of the organic gas inside the lithium ion secondary battery manufactured by the manufacturing method of the general lithium ion secondary battery as shown in FIG. 6 is shown as a comparative example.
- the volume of organic gas was measured twice immediately after the degassing process and 30 days after the degassing process. The measured value shows the same value.
- the volume of the organic gas is measured twice immediately after the aging process and 30 days after the aging process, and the two measured values show the same value.
- the degassing process is performed after the aging process, so the ratio of the organic gas present in the lithium ion secondary battery is 1.6%. Few.
- the degassing process is performed before the aging process, so the organic gas ratio increases to 4.9%.
- the ratio of the organic gas is 2% or more, no lithium metal is deposited on the surface of the negative electrode 22, and the battery capacity is improved.
- the lithium-ion secondary battery Before charging the lithium-ion secondary battery to a cell voltage exceeding 4.0 V, which is almost fully charged, the lithium-ion secondary battery is charged in the range of 4.0 V or less and degassed. In the charging step, it is possible to prevent lithium metal from being deposited on the surface of the negative electrode.
- the lithium ion secondary battery is charged by a constant current-constant voltage charging method, so that the cell voltage of the lithium ion secondary battery can be easily controlled to a target value.
- the electrolytic solution in the unsealed position is moved in advance to the power generation element side by performing roll press, so that leakage of the electrolytic solution from the unsealed portion can be prevented at the time of unsealing.
- pouring process can be reduced.
- work which wipes off electrolyte solution after a degassing process can be skipped. As a result, the manufacturing cost of the lithium ion secondary battery can be suppressed.
- the lithium ion secondary battery can be downsized.
- the lithium ion secondary battery can be densely packaged.
- the lithium ion secondary battery in the precharging step, first, the lithium ion secondary battery is charged to the first voltage value and then charged to the second voltage value.
- the lithium ion secondary battery does not necessarily need to be precharged in two stages, and the lithium ion secondary battery may be charged from the beginning to the second voltage value without setting the first voltage value.
- the lithium ion secondary battery in which the positive electrode lead and the negative electrode lead are respectively led out from the same end portion of the outer package has been described as an example.
- the form of the lithium ion secondary battery of the present invention is not limited to this, and may be a lithium ion secondary battery in which the positive electrode lead and the negative electrode lead are respectively led out from the opposing ends of the exterior material. Good.
- Lithium ion secondary battery 11 Positive lead, 12 Negative lead, 13 exterior body, 20 power generation elements, 21 positive electrode, 22 negative electrode, 23 separator, 24 positive electrode current collector, 25 positive electrode active material layer, 26 negative electrode current collector, 27 negative electrode active material layer, 50 charger, 60 pressure roller, 70 decompression chamber, 131 Surplus part, 132 vent holes, 133 A part of the exterior body.
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Abstract
Description
図7は、プレ充電工程を説明するための図である。本実施形態のプレ充電工程では、充電器50が、プレ充電処理を実行して、リチウムイオン二次電池10を充電する。
図9は、ガス抜き前のリチウムイオン二次電池10の外観を示す図である。図9に示すとおり、ガス抜き前のリチウムイオン二次電池10は、外装体13の側部に余剰部131が設けられている。外装体13の周縁部は熱融着されており、外装体13の内部には、発電要素20が電解液とともに収容されている。
図14は、充電器50が実行する初充電処理の手順を示すフローチャートである。
11 正極リード、
12 負極リード、
13 外装体、
20 発電要素、
21 正極、
22 負極、
23 セパレータ、
24 正極集電体、
25 正極活物質層、
26 負極集電体、
27 負極活物質層、
50 充電器、
60 加圧ローラ、
70 減圧チャンバ、
131 余剰部、
132 ガス抜き孔、
133 外装体の部分。
Claims (15)
- 正極と負極とがセパレータを介して積層された発電要素を電解液とともに外装体の内部に封入してなるリチウムイオン二次電池の製造方法であって、
前記リチウムイオン二次電池のセル電圧が4.0V以下の範囲で前記リチウムイオン二次電池を充電する工程(a)と、
前記工程(a)において充電された前記リチウムイオン二次電池の前記外装体を開封して、前記リチウムイオン二次電池の内部のガスを外部に排出し、その後、再度封止する工程(b)と、
前記工程(b)においてガスが排出された前記リチウムイオン二次電池を、前記セル電圧が4.0Vよりも大きくなるまで充電する工程(c)と、
を有するリチウムイオン二次電池の製造方法。 - 前記工程(a)は、
前記セル電圧が2.8V以下の範囲で前記リチウムイオン二次電池を充電する工程(a1)と、
前記工程(a1)において2.8V以下の範囲で充電された前記リチウムイオン二次電池を、前記セル電圧が2.8Vよりも大きく4.0V以下の範囲で充電する工程(a2)と、を有する、請求項1に記載のリチウムイオン二次電池の製造方法。 - 前記工程(a)において、定電流-定電圧充電方式により前記リチウムイオン二次電池が充電される、請求項1または2に記載のリチウムイオン二次電池の製造方法。
- 前記工程(a)と前記工程(b)との間に、
前記リチウムイオン二次電池を1時間以上放置する工程(d)をさらに有する、請求項1~3のいずれか1項に記載のリチウムイオン二次電池の製造方法。 - 前記工程(b)において、前記発電要素の外周端と前記外周端に対向する前記外装体の内周端との間が開封される、請求項1~4のいずれか1項に記載のリチウムイオン二次電池の製造方法。
- 前記工程(b)において、前記外装体の開封前に、前記外装体の前記内周端から前記発電要素の前記外周端に向かって前記リチウムイオン二次電池がロールプレスされる、請求項5に記載のリチウムイオン二次電池の製造方法。
- 前記外装体は、熱融着可能な材料により構成されており、
前記工程(b)において、前記発電要素の前記外周端と前記外装体の開封部との間に位置する前記外装体の部分が熱融着されることにより前記外装体が再度封止される、請求項5または6に記載のリチウムイオン二次電池の製造方法。 - 前記工程(b)において、前記外装体が再度封止された後に、前記熱融着された部分と前記開封部との間で前記外装体が切断される、請求項7に記載のリチウムイオン二次電池の製造方法。
- 前記工程(b)において、少なくとも前記外装体が開封された後から、再度封止される前までの工程は減圧下で行われる、請求項1~8のいずれか1項に記載のリチウムイオン二次電池の製造方法。
- 前記工程(c)において、定電流-定電圧充電方式により前記リチウムイオン二次電池が充電される、請求項1~9のいずれか1項に記載のリチウムイオン二次電池の製造方法。
- 前記発電要素の前記負極は、水系バインダーを含む、請求項1~10のいずれか1項に記載のリチウムイオン二次電池の製造方法。
- 前記水系バインダーは、スチレンブタジエンラバー(SBR)とカルボキシメチルセルロース(CMC)との混合物である、請求項11に記載のリチウムイオン二次電池の製造方法。
- 正極と負極とがセパレータを介して積層された発電要素を電解液とともに外装体の内部に封入してなるリチウムイオン二次電池であって、
前記外装体の内部空間の体積に対する前記内部空間に存在する有機ガスの体積の割合が2%以上である、リチウムイオン二次電池。 - 出荷後の充放電サイクルが10サイクル経過する前の前記リチウムイオン二次電池における前記割合が2%以上である、請求項13に記載のリチウムイオン二次電池。
- 出荷後30日が経過する前の前記リチウムイオン二次電池における前記割合が2%以上である、請求項13に記載のリチウムイオン二次電池。
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