CN103613366A - Ceramic membrane slurry for lithium battery and method for preparing pole pieces coated with same - Google Patents
Ceramic membrane slurry for lithium battery and method for preparing pole pieces coated with same Download PDFInfo
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- CN103613366A CN103613366A CN201310599986.4A CN201310599986A CN103613366A CN 103613366 A CN103613366 A CN 103613366A CN 201310599986 A CN201310599986 A CN 201310599986A CN 103613366 A CN103613366 A CN 103613366A
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Abstract
The invention relates to ceramic membrane slurry for a lithium battery. The ceramic membrane slurry is prepared from the following ingredients in percentage by weight: 30-50wt% of one or a mixture of nanoscale alumina and nanoscale silica, 2-6wt% of binder, 0.5-2wt% of dispersing agent, 2-15wt% of pore forming agent and 40-60wt% of solvent, wherein the slurry is subjected to high-speed dispersion so as to be mixed uniformly. A method for preparing pole pieces coated with the ceramic membrane slurry comprises the following steps of carrying out first-time rolling treatment on coated negative graphite battery pole pieces and nickel-cobalt-manganese ternary positive pole pieces, and then, spraying the ceramic membrane slurry on surfaces for the first time; baking the pole pieces, then, carrying out second-time rolling treatment, and then, spraying the ceramic membrane slurry on surfaces for the second time; baking the pole pieces, and then, carrying out third-time rolling treatment, so as to reach the required pole piece thickness, wherein the thickness of ceramic membranes is controlled to be 8-20 microns; enabling the coated pole pieces to be subjected to high-temperature (130-140 DEG C) heating, so as to volatilize the pore forming agent, wherein the porosity is controlled to be 40-65%.
Description
Technical field
The present invention relates to a kind of lithium ion battery, relate in particular to a kind of ceramic membrane slurry for lithium cell, also relate to a kind of preparation method who scribbles this ceramic membrane slurry pole piece.
Background technology
Development novel material, exploitation renewable energy technologies become one of key subjects that the 21 century mankind will solve.And be the important means of effective use of energy sources as the chemical power source of energy storage and conversion system.At present, lithium ion battery, fuel cell are the study hotspots of field of chemical power source, especially as power cell, environment protection and social development are had great importance.Lithium ion battery is because of its operating voltage is high, energy density is large, self-discharge rate is low, advantages of environment protection is subject to countries in the world extensive concern.
Lithium ion battery primary structure comprises that positive pole, negative pole, barrier film, electrolytic solution, shell five parts form, and its septation mostly is the organic materialss such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) and forms.When temperature surpasses 150 ℃, organic barrier film will produce serious contraction.When hot conditions lower diaphragm plate shrinks, the positive and negative electrode of battery is contact directly, and energy discharges fast, can cause the phenomenons such as battery is on fire, blast.Barrier film plays a very important role to cell safety, for solving the high-temperature shrinkage problem of barrier film, adopts inorganic materials barrier film to substitute organic barrier film, can effectively solve the safety issue of battery.
Summary of the invention
The object of this invention is to provide the ceramic membrane slurry for lithium cell that a kind of safety performance is good, also relate to a kind of preparation method who scribbles this ceramic membrane slurry pole piece.
For achieving the above object, the technical solution used in the present invention is: a kind of ceramic membrane slurry for lithium cell, it is characterized in that: fill a prescription as one or both mixing 30-50wt% in alumina in Nano level or nanometer grade silica, binding agent 2-6wt%, dispersion agent 0.5-2wt%, pore former 2-15wt%, solvent 40-60wt%, slurry adopts high speed dispersion, and slurry is mixed.
A preparation method who scribbles this ceramic membrane slurry pole piece, is characterized in that: its step is as follows:
(1) the battery graphite cathode sheet coating and nickel-cobalt-manganese ternary positive plate are carried out to roller process first, then on surface, carry out ceramic coated film slurry first;
(2) after pole piece is dried, then carry out secondary roller process, then on surface, carry out the ceramic coated film slurry of secondary;
(3) after pole piece is dried, then carry out three roller process and meet the requirements of pole piece thickness, and the gauge control of ceramic membrane is at 8-20 μ m;
(4) coated pole piece carries out a high temperature 130-140 ℃ heating and makes pore former volatilization, and porosity is controlled at 40-65%.
Advantageous effect of the present invention is: (1) the present invention is suitable for laminated power battery, can effectively improve the security of battery.(2) manufacture craft is simple, battery all by 3C/10V overcharge, the safety testing such as 150 ℃/30min thermal shocking, short circuit, acupuncture, extruding; (3) battery of preparing, its continuous discharge electric current can reach 10C.
Accompanying drawing explanation
Fig. 1 is the structural representation of the lithium cell made of the present invention;
Fig. 2 is the cycle performance figure of the lithium cell made of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
The present invention as shown in Figure 1, 2, a kind of ceramic membrane slurry for lithium cell, it is characterized in that: fill a prescription as one or both mixing 30-50wt% in alumina in Nano level or nanometer grade silica, binding agent 2-6wt%, dispersion agent 0.5-2wt%, pore former 2-15wt%, solvent 40-60wt%, slurry adopts high speed dispersion, and slurry is mixed.
This is for the ceramic membrane slurry of lithium cell, and described binding agent is polyvinylidene difluoride (PVDF) (PVDF), and dispersion agent is polyvinylpyrrolidone (PVP), and pore former is polyoxyethylene glycol (PEG), and solvent is nitrogen methyl-2-pyrrolidone (NMP).
A preparation method who scribbles this ceramic membrane slurry pole piece, is characterized in that: its step is as follows:
(1) the battery graphite cathode sheet coating and nickel-cobalt-manganese ternary positive plate are carried out to roller process first, then on surface, carry out ceramic coated film slurry first;
(2) after pole piece is dried, then carry out secondary roller process, then on surface, carry out the ceramic coated film slurry of secondary;
(3) after pole piece is dried, then carry out three roller process and meet the requirements of pole piece thickness, and the gauge control of ceramic membrane is at 8-20 μ m;
(4) coated pole piece carries out a high temperature 130-140 ℃ heating and makes pore former volatilization, and porosity is controlled at 40-65%.
In this method, (1) carries out roller process first by the battery graphite cathode sheet coating and nickel-cobalt-manganese ternary positive plate, then on surface, carries out ceramic coated film slurry first, and pole piece two sides coating thickness is all controlled at 8 μ m ± 2 μ m;
(2) after pole piece is dried, then carry out secondary roller process, then on surface, carry out the ceramic coated film slurry of secondary, the ceramic membrane gauge control of spraying is at 6 μ m ± 2 μ m for the second time, and final spraying thickness is above 14 ± 4 μ m;
(3) after pole piece is dried, then carry out three roller process and meet the requirements of pole piece thickness, the anodal thickness after processing is 130 ± 3 μ m, and the thickness of negative plate is 142 ± 3 μ m;
(4) coated pole piece carries out a high temperature 130-140 ℃ heating and makes pore former volatilization, and porosity is controlled at 45%.
Embodiment 1
A ceramic membrane slurry for lithium cell, is characterized in that: filling a prescription is: alumina in Nano level 43wt%, binding agent 4wt%, dispersion agent 1wt%, pore former 9wt%, solvent 43wt%, slurry adopts high speed dispersion, speed is 2200 revs/min, stirs 4 hours, and slurry is mixed.
Embodiment 2
A ceramic membrane slurry for lithium cell, is characterized in that: fill a prescription as one or both mixing 30wt% in alumina in Nano level or nanometer grade silica, binding agent 2wt%, dispersion agent 0.5wt%, pore former 2wt%, solvent 40wt%, slurry adopts high speed dispersion, and slurry is mixed.
Embodiment 3
A ceramic membrane slurry for lithium cell, is characterized in that: fill a prescription as one or both mixing 50wt% in alumina in Nano level or nanometer grade silica, binding agent 6wt%, dispersion agent 2wt%, pore former 15wt%, solvent 60wt%, slurry adopts high speed dispersion, and slurry is mixed.
The preparation of battery: the making that after pole piece applies, carry out pole piece cross cutting, tab welding, lug rubberizing, lamination, assembling, baking, fluid injection, change into, the operation such as partial volume completes battery.
Battery length and width size is respectively 240mm, 120mm, and design capacity is 10Ah, and its structure as shown in Figure 1.Cycle performance as shown in Figure 2, can be found out and have good cycle performance.
Claims (7)
1. the ceramic membrane slurry for lithium cell, it is characterized in that: fill a prescription as one or both mixing 30-50wt% in alumina in Nano level or nanometer grade silica, binding agent 2-6wt%, dispersion agent 0.5-2wt%, pore former 2-15wt%, solvent 40-60wt%, slurry adopts high speed dispersion, and slurry is mixed.
2. a kind of ceramic membrane slurry for lithium cell according to claim 1, it is characterized in that: filling a prescription is: alumina in Nano level 43wt%, binding agent 4wt%, dispersion agent 1wt%, pore former 9wt%, solvent 43wt%, slurry adopts high speed dispersion, speed is 2200 revs/min, stirs 4 hours, and slurry is mixed.
3. a kind of ceramic membrane slurry for lithium cell according to claim 1, it is characterized in that: fill a prescription as one or both mixing 30wt% in alumina in Nano level or nanometer grade silica, binding agent 2wt%, dispersion agent 0.5wt%, pore former 2wt%, solvent 40wt%, slurry adopts high speed dispersion, and slurry is mixed.
4. a kind of ceramic membrane slurry for lithium cell according to claim 1, it is characterized in that: fill a prescription as one or both mixing 50wt% in alumina in Nano level or nanometer grade silica, binding agent 6wt%, dispersion agent 2wt%, pore former 15wt%, solvent 60wt%, slurry adopts high speed dispersion, and slurry is mixed.
5. according to a kind of ceramic membrane slurry for lithium cell described in claim 1 or 2 or 3 or 4, it is characterized in that: described binding agent is polyvinylidene difluoride (PVDF) (PVDF), dispersion agent is polyvinylpyrrolidone (PVP), pore former is polyoxyethylene glycol (PEG), and solvent is nitrogen methyl-2-pyrrolidone (NMP).
6. a preparation method who scribbles this ceramic membrane slurry pole piece, is characterized in that: its step is as follows:
(1) the battery graphite cathode sheet coating and nickel-cobalt-manganese ternary positive plate are carried out to roller process first, then on surface, carry out ceramic coated film slurry first;
(2) after pole piece is dried, then carry out secondary roller process, then on surface, carry out the ceramic coated film slurry of secondary;
(3) after pole piece is dried, then carry out three roller process and meet the requirements of pole piece thickness, and the gauge control of ceramic membrane is at 8-20 μ m;
(4) coated pole piece carries out a high temperature 130-140 ℃ heating and makes pore former volatilization, and porosity is controlled at 40-65%.
7. a kind of preparation method who scribbles this ceramic membrane slurry pole piece according to claim 6, is characterized in that: its step is as follows:
(1) the battery graphite cathode sheet coating and nickel-cobalt-manganese ternary positive plate are carried out to roller process first, then on surface, carry out ceramic coated film slurry first, pole piece two sides coating thickness is all controlled at 8 μ m ± 2 μ m;
(2) after pole piece is dried, then carry out secondary roller process, then on surface, carry out the ceramic coated film slurry of secondary, the ceramic membrane gauge control of spraying is at 6 μ m ± 2 μ m for the second time, and final spraying thickness is above 14 ± 4 μ m;
(3) after pole piece is dried, then carry out three roller process and meet the requirements of pole piece thickness, the anodal thickness after processing is 130 ± 3 μ m, and the thickness of negative plate is 142 ± 3 μ m;
(4) coated pole piece carries out a high temperature 130-140 ℃ heating and makes pore former volatilization, and porosity is controlled at 45%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505255A (en) * | 2016-12-30 | 2017-03-15 | 珠海银隆新能源有限公司 | A kind of manufacture craft and battery without barrier film lithium-ion electric core |
| CN106848184A (en) * | 2017-03-07 | 2017-06-13 | 易佰特新能源科技有限公司 | A kind of electrodes of lithium-ion batteries and preparation method thereof and lithium ion battery |
| CN109004153A (en) * | 2018-06-28 | 2018-12-14 | 中国电力科学研究院有限公司 | A kind of ultrathin electrodes support type anodic aluminium oxide membrane and preparation method thereof |
| CN110893324A (en) * | 2019-12-06 | 2020-03-20 | 北京工业大学 | Method for preparing hydrophobic porous cordierite ceramic membrane for desalination by taking high-silicon solid waste as raw material through tape casting |
| CN111769237A (en) * | 2020-07-21 | 2020-10-13 | 河北金力新能源科技股份有限公司 | Functional diaphragm for lithium battery and preparation method thereof |
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| CN101281961A (en) * | 2007-04-06 | 2008-10-08 | 比亚迪股份有限公司 | Coating composition for lithium ion battery diaphragm and method for making the same |
| CN101359733A (en) * | 2007-07-31 | 2009-02-04 | 比亚迪股份有限公司 | Method for coating positive pole active substance of lithium ionic secondary battery |
| CN101786873A (en) * | 2009-01-22 | 2010-07-28 | 中国科学院上海硅酸盐研究所 | Method for preparing electrolyte ceramic membrane of lithium ion battery |
| CN102420300A (en) * | 2011-12-07 | 2012-04-18 | 保定市山河日月实业有限公司 | Method for preparing lithium ion battery diaphragm |
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2013
- 2013-11-25 CN CN201310599986.4A patent/CN103613366A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101281961A (en) * | 2007-04-06 | 2008-10-08 | 比亚迪股份有限公司 | Coating composition for lithium ion battery diaphragm and method for making the same |
| CN101359733A (en) * | 2007-07-31 | 2009-02-04 | 比亚迪股份有限公司 | Method for coating positive pole active substance of lithium ionic secondary battery |
| CN101786873A (en) * | 2009-01-22 | 2010-07-28 | 中国科学院上海硅酸盐研究所 | Method for preparing electrolyte ceramic membrane of lithium ion battery |
| CN102420300A (en) * | 2011-12-07 | 2012-04-18 | 保定市山河日月实业有限公司 | Method for preparing lithium ion battery diaphragm |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505255A (en) * | 2016-12-30 | 2017-03-15 | 珠海银隆新能源有限公司 | A kind of manufacture craft and battery without barrier film lithium-ion electric core |
| CN106848184A (en) * | 2017-03-07 | 2017-06-13 | 易佰特新能源科技有限公司 | A kind of electrodes of lithium-ion batteries and preparation method thereof and lithium ion battery |
| CN109004153A (en) * | 2018-06-28 | 2018-12-14 | 中国电力科学研究院有限公司 | A kind of ultrathin electrodes support type anodic aluminium oxide membrane and preparation method thereof |
| CN110893324A (en) * | 2019-12-06 | 2020-03-20 | 北京工业大学 | Method for preparing hydrophobic porous cordierite ceramic membrane for desalination by taking high-silicon solid waste as raw material through tape casting |
| CN111769237A (en) * | 2020-07-21 | 2020-10-13 | 河北金力新能源科技股份有限公司 | Functional diaphragm for lithium battery and preparation method thereof |
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Application publication date: 20140305 |