CN1274052C - Method for producing lithium ion secondary cell - Google Patents

Method for producing lithium ion secondary cell Download PDF

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CN1274052C
CN1274052C CN 03114039 CN03114039A CN1274052C CN 1274052 C CN1274052 C CN 1274052C CN 03114039 CN03114039 CN 03114039 CN 03114039 A CN03114039 A CN 03114039A CN 1274052 C CN1274052 C CN 1274052C
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positive electrode
lithium ion
lithium
ion secondary
secondary battery
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CN1532984A (en
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张建昌
王传福
宋富兵
沈菊林
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比亚迪股份有限公司
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    • YGENERAL 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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    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Abstract

本发明公开了一种正极采用水系拉浆制片的锂离子二次电池锂离子的制作方法。 The present invention discloses a method for manufacturing a positive electrode using a lithium ion secondary battery, a lithium ion in aqueous pull pulp production. 该方法是在拉浆制片过程中正极浆料通过将水溶性粘合剂溶解在去离子水中,再按照一定次序分别加入正极活性物质、碳系材料导电剂、增粘剂以及用以改善正极层密着性的添加剂,进行充分地分散后制成的。 This pulp production method is pulled by the positive electrode slurry during the water-soluble binder is dissolved in deionized water, and then according to a certain order of addition of the positive electrode active material, respectively, a carbon-based material of the conductive agent, and a thickener for improving positive adhesion of the additive layer, sufficiently performed in the finished dispersion. 通过该方法生产锂离子二次电池可以降低生产成本并防止环境污染。 By this method for producing a lithium ion secondary battery can reduce manufacturing costs and preventing environmental pollution.

Description

锂离子二次电池的制造方法 A method for producing a lithium ion secondary battery

【技术领域】本发明涉及一种锂离子二次电池的制造方法,特别是涉及一种采用正极水系拉浆制片的锂离子二次电池的制造方法。 TECHNICAL FIELD The present invention relates to a method for producing a lithium ion secondary battery, particularly to a method for producing a secondary lithium ion battery positive electrode using an aqueous pull pulp production.

【背景技术】自1980年提出“摇椅电池”(RCB)的概念后,日本索尼公司和三洋公司分别于1985年和1988年开始了锂离子二次电池实用化研究。 BACKGROUND since 1980, put forward the concept of "rocking chair battery" (RCB), the Japanese company Sony and Sanyo, respectively, in 1985 and 1988 began to study the practical lithium ion secondary battery. 由于锂离子二次电池具有工作电压高、比能量大、自放电小、应用温度范围宽、工作电压平稳、贮存寿命长等突出优点,世界各国均对锂离子二次电池在通讯领域、便携式电子产品、电动车和航空航天等方面的应用表示出极大的兴趣与热情,并且针对锂离子二次电池的性能及制造工艺进行了不断的探索和改进。 Since the lithium ion secondary battery has a high operating voltage, high energy density, low self-discharge, a wide temperature range, stable voltage, long storage life and other advantages, countries around the world in the secondary battery of lithium ion communications, portable electronics applications, electric vehicles and other aspects of the aerospace expressed great interest and enthusiasm, and were for lithium ion secondary battery of performance and manufacturing processes continue to explore and improve.

锂离子二次电池的制造工艺中必须使用合适的粘合剂来完成电极的制备,粘合剂在电池中主要用以将活性物质与电极集流体互相粘合在一起。 Process for producing a lithium ion secondary battery must be prepared using a suitable adhesive to complete the electrode, the adhesive used in the battery main electrode active material and the current collector bonded to each other. 目前,锂离子二次电池正极大都采用聚偏二氟乙烯(PVDF)作为粘合剂,用强极性有机化合物如N-二甲基吡咯烷酮(NMP)、二甲基甲酰胺(DMF)、二甲基亚砜(DMSO)等作为PVDF的溶剂,即采用有机系拉浆制片。 Currently, lithium ion secondary batteries are greatly positive polyvinylidene fluoride (PVDF) as a binder, with a strongly polar organic compound such as dimethyl N- methylpyrrolidone (NMP), dimethylformamide (DMF), two methyl sulfoxide (DMSO) in a solvent such as PVDF, i.e., organic-based slurry pull producer. 有机系拉浆制片时需要用到昂贵且具有腐蚀性的有机溶剂如NMP等,使用量大且难以回收,大大地增加了生产的成本。 You need to use expensive organic pulled pulp producer and corrosive organic solvent such as NMP and the like, the use of large and are difficult to recycle, significantly increases the cost of production. 同时,拉浆制片时需将有机溶剂加热除去,必须加装大量环保设备以防环境污染,给生产操作带来诸多不便。 Meanwhile, the organic solvent was removed by heating the required pull pulp producer, a large number of environmental protection equipment must be installed to prevent environmental pollution, to inconvenience the operation of production.

【发明内容】本发明的目的在于提供一种低成本、无污染的锂离子二次电池的制造方法。 SUMMARY OF THE INVENTION An object of the present invention is to provide a low cost, non-polluting manufacturing method of a lithium ion secondary battery.

为实现以上目的,本发明提出的技术方案是:锂离子二次电池的正极采用水系拉浆制片方法,其特点是,在拉浆制片过程中正极浆料通过将水溶性粘合剂溶解在去离子水中,再按照一定次序分别加入正极活性物质、碳系材料导电剂、增粘剂以及用以改善正极层密着性的添加剂,进行充分地分散后制成的。 To achieve the above object, the technical solution proposed by the invention is: a positive electrode of lithium ion secondary battery production method using an aqueous slurry pull, which is characterized, in the pulp production process of pulling positive electrode slurry by dissolving the water-soluble binder after deionized water were then added according to a certain order of a positive electrode active material, a conductive carbon-based material, a tackifier and a positive electrode layer to improve the adhesion of the additives, be made sufficiently dispersed. 将上述配制好的浆料均匀地涂布在正极集流体铝箔上,于一定温度下干燥,压延后即可得到一定厚度的正极片。 The slurry prepared above was uniformly coated on a positive electrode current collector aluminum foil, and dried at a certain temperature, to obtain a predetermined thickness of the positive electrode sheet after rolling.

所述锂离子二次电池的正极片含有一种锂与过渡金属的层状复合氧化物,它们是具有一定特定结构的活性物质,可以与锂离子进行可逆的反应。 The lithium ion secondary battery comprising a positive electrode sheet layered composite oxide of a lithium and a transition metal, which is an active material having a certain specific structure, can reversibly react with lithium ions.

所述锂离子二次电池的负极活性物质为能够使锂离子反复嵌入和脱嵌的碳系材料,并且负极还含有金属材质的电极集流体(通常均为铜箔)以及将负极材料粘结到电极集流体上的粘合剂。 The lithium ion secondary battery negative electrode active material capable of lithium ions to repeat intercalation and deintercalation carbon-based material, and further comprising a negative electrode collector (copper foil are typically) of metal material and the negative electrode material is bonded to adhesive on the fluid collector electrode.

所述锂离子二次电池的电解液为含有锂盐的链状酸酯和环状酸酯的混合溶液。 The lithium ion secondary battery electrolyte of a mixed solution of chain esters and cyclic esters containing a lithium salt.

本发明的优点在于:在正极拉浆制片过程中可以用廉价、无污染的去离子水代替昂贵且具有腐蚀性的有机溶剂,无须加装环保设备,从而极大地降低了电池原料及生产设备投资的成本;并且由此方法制得的锂离子二次电池具有良好的高倍率放电特性和循环特性。 Advantage of the present invention is that: the positive electrode can be pull the pulp production process with an inexpensive, non-polluting deionized water instead of expensive and corrosive organic solvents, no need to install environmental equipment, thereby greatly reducing the battery materials and equipment investment costs; and methods thus obtained lithium ion secondary battery having excellent high-rate discharge characteristics and cycle characteristics.

本发明的具体实施,性能及其优点由实施例进一步说明。 Specific embodiments of the present invention, and its advantages are further illustrated by the performance of the embodiment.

【具体实施方式】本发明正极水系拉浆制片方法的锂离子二次电池,其由正极、负极、电解液和隔膜等主要部分所构成。 The lithium ion secondary battery DETAILED DESCRIPTION The present invention is a positive electrode production method of an aqueous slurry of the pull, which is composed of a main portion of the positive electrode, negative electrode, electrolyte and diaphragms. 其中:所述锂离子二次电池的正极含有一种锂与过渡金属的层状复合氧化物,它们是具有一定特定结构的活性物质,可以与锂离子进行可逆的反应。 Wherein: the positive electrode of the lithium ion secondary battery comprising a lithium composite oxide with a layered transition metal, which is an active material having a certain specific structure, can reversibly react with lithium ions. 此类活性物质材料的实例包括:LixNi1-yCoyO2(其中,0.9≤x≤1.1,0≤y≤1.0)、LixMn2-yByO2(其中,B为过渡金属,0.9≤x≤1.1,0≤y≤1.0)等。 Examples of such active material comprising: LixNi1-yCoyO2 (wherein, 0.9≤x≤1.1,0≤y≤1.0), LixMn2-yByO2 (wherein, B is a transition metal, 0.9≤x≤1.1,0≤y≤1.0 )Wait. 并且正极还含有金属材质的电极集流体(通常均为铝箔)、碳系材料导电剂、将正极材料粘结到电极集流体上的粘合剂、增粘剂以及用以改善正极层密着性的添加剂。 And further comprising a positive electrode collector (aluminum foil are typically) of metal material, a carbon-based material of the conductive agent, the positive electrode material bonded to the adhesive on the collector electrode, and a tackifier for improving adhesion between the positive electrode layer, additive. 其中碳系材料导电剂的实例包括炭黑、碳纤维和石墨等。 Examples of carbon-based material wherein the conductive agent include carbon black, graphite, carbon fibers, and the like.

所述正极浆料是通过将一种合适的水溶性粘合剂溶解在去离子水中,再按照一定次序分别加入正极活性物质、碳系材料导电剂、增粘剂以及用以改善正极层密着性的添加剂,进行充分地分散后制成的。 The positive electrode slurry is formed by a suitable water-soluble binder is dissolved in deionized water, and then according to a certain order of addition were positive electrode active material, a carbon-based material of the conductive agent, and a thickener to improve the adhesion between the positive electrode layer additive, after made sufficiently dispersed. 在本发明中所述的水溶性粘合剂选自PTFE与SBR,可以使用其中之一或其混合物,用量优选为正极活性物质的0.5~15.0wt%。 In the present invention, the water-soluble binder is selected from PTFE and SBR, one of which may be used or mixtures thereof, preferably used in an amount of 0.5 ~ 15.0wt% positive electrode active material. 增粘剂选自MC、CMC、HPMC、CMHEC和HPC等,可以使用其中之一或其混合物,用量优选为正极活性物质的0.2~10.0wt%。 A thickener selected from MC, CMC, HPMC, CMHEC HPC and the like, may be used in which one or mixtures thereof, preferably used in an amount of 0.2 ~ 10.0wt% positive electrode active material. 用以改善正极层密着性的添加剂为甲基硅油和碳纤维,其中甲基硅油的用量优选为正极活性物质的0.1~8.0wt%,碳纤维的用量优选为正极活性物质的0.1~15.0wt%。 The positive electrode layer to improve the adhesion of the additive to simethicone and carbon fibers, wherein the amount of simethicone is preferably 0.1 ~ 8.0wt% of the positive electrode active material, the amount of carbon fiber is preferably 0.1 ~ 15.0wt% positive electrode active material.

将依照上述方法配制好的浆料均匀地涂布在正极集流体铝箔上,于一定温度下干燥,压延后即可得到一定厚度的正极片。 The slurry was prepared according to the above method was uniformly coated on a positive electrode current collector aluminum foil, and dried at a certain temperature, to obtain a predetermined thickness of the positive electrode sheet after rolling.

在本发明中,加入甲基硅油添加剂的目的是为了减少配料和拉浆过程中气泡的产生,增强浆料与正极集流体铝箔的密着性,使极片表面更加平整光滑。 In the present invention, the simethicone was added object is to reduce the additive ingredients and the process of pulling the slurry bubbles with the slurry to enhance adhesion of the positive electrode current collector foil, so that the pole piece surface more smooth. 同时,甲基硅油良好的表面活性也改善了电解液对极片的浸润性。 At the same time, good simethicone surfactant also improves the wettability to the electrolyte electrode sheet. 在本发明中,加入碳纤维添加剂的目的是为了增强极片的柔性和机械强度,改善正极层的密着性。 In the present invention, the object is added to the carbon fiber additive to enhance the flexibility and the mechanical strength of the pole pieces to improve the adhesion of the positive electrode layer. 因此,通过加入上述两种添加剂,可以使正极层的附料更加紧密,从而提高了锂离子二次电池的循环特性和高倍率放电特性。 Thus, by the addition of the two additives, the positive electrode material layer can be attached more closely, thereby improving the cycle characteristics of the secondary battery and lithium-ion high-rate discharge characteristics.

本发明锂离子二次电池的负极活性物质为能够使锂离子反复嵌入和脱嵌的碳系材料,其实例包括天然石墨、人造石墨、MCMB、MCF等。 The lithium ion secondary battery of the present invention, the negative electrode active material capable of lithium ions to repeat intercalation and deintercalation of carbon-based material, and examples thereof include natural graphite, artificial graphite, MCMB, MCF like. 并且负极还含有金属材质的电极集流体(通常均为铜箔)以及将负极材料粘结到电极集流体上的粘合剂,粘合剂的实例包括聚烯烃化合物如PTFE与SBR等。 And further comprising a negative electrode collector (copper foil are typically) and the adhesive material to the adhesive on the negative electrode collector electrode of metal material, examples of the binder include polyolefins such as PTFE and SBR compounds and the like.

本发明锂离子二次电池的电解液为含有锂盐的链状酸酯和环状酸酯的混合溶液。 Electrolyte lithium ion secondary battery of the present invention is a mixed solution of chain esters and cyclic esters containing a lithium salt. 锂盐的实例包括LiClO4、LiPF6、LiBF4、卤化锂、氯铝酸锂、氟烃基氟氧磷酸锂及氟烃基磺酸锂等,可以使用其中之一或其混合物。 Examples of the lithium salts include LiClO4, LiPF6, LiBF4, lithium halide, lithium aluminate chloro, fluoro hydrocarbon oxyfluorophosphoric lithium phosphate and lithium-fluoro-hydrocarbon acid and the like, may be used in which one or mixtures thereof. 链状酸酯的实例包括DMC、DEC、EMC、MPC、DPC、MA、EA、PA、以及其它含氟、含硫或含不饱和键的链状有机酯类,可以使用其中之一或其混合物。 Examples of the chain esters include DMC, DEC, EMC, MPC, DPC, MA, EA, PA, and other fluorine, sulfur or unsaturated bond-containing linear organic esters, or mixtures thereof may be used one wherein . 环状酸酯的实例包括EC、PC、VC、γ-BL、磺内酯以及其它含氟、含硫或含不饱和键的环状有机酯类,可以使用其中之一或其混合物。 Examples of the cyclic esters include EC, PC, VC, γ-BL, sultone, and other fluorine, sulfur or unsaturated bond-containing cyclic organic esters may be used in which one or mixtures thereof.

【实施例1】首先将LiCoO2和乙炔黑在150℃下干燥2h,然后按照一定比例混料2h。 [Example 1] First, LiCoO2 and acetylene black was dried for 2h at 150 ℃, and a certain proportion mixing 2h. 在去离子水中分别加入甲基硅油、碳纤维、CMC和PTFE,再搅拌4h。 In deionized water were added methyl silicone oil, carbon fibers, CMC, and PTFE, stirred for 4h. 最后加入混合好的LiCoO2和乙炔黑,充分混合制成正极浆料。 Added last LiCoO2 and acetylene black mixed well, thoroughly mixed to obtain a positive electrode slurry. 其组成为LiCoO2∶乙炔黑∶PTFE∶CMC∶甲基硅油∶碳纤维=90∶3∶3∶1.5∶0.5∶2。 Consisting of acetylene black :PTFE:CMC: LiCoO2: methicone: = 90:3:3:1.5:0.5:2 carbon fibers. 将配制好的浆料均匀地涂布在20μm的铝箔上,于90℃下干燥。 The prepared slurry was uniformly coated on a 20μm aluminum foil, dried at 90 ℃. 压延后得到厚度为140μm的正极片。 After rolling to give a thickness of 140μm positive electrode sheet.

将一定量的PTFE以一定比率溶解在去离子水中,将人造石墨及CMC加入该溶液中,充分混合制成浆料,其组成为人造石墨∶PTFE∶CMC=90∶7∶3。 The amount of PTFE in a constant ratio were dissolved in deionized water, artificial graphite, and CMC was added to the solution, and thoroughly mixed to obtain a slurry, consisting of artificial graphite :PTFE:CMC = 90:7:3. 再将该浆料均匀地涂布在20μm的铜箔上,于90℃下干燥。 Was added and the slurry was uniformly coated on a copper foil of 20μm, dried at 90 ℃. 压延后得到厚度为140μm的负极片。 After rolled to give negative electrode sheet having a thickness of 140μm.

将上述的正、负极片与25μm厚的聚丙烯微孔性隔膜卷绕成一个锂离子二次电池的电芯,装入电池壳中进行焊接,随后将LiPF6按1mol/dm3的浓度溶解在EC/DMC=1∶1的混合溶剂中所形成的电解液注入电池壳中,密封,制成锂离子二次电池。 The above-described positive and negative electrode plate wound with 25μm thick polypropylene microporous battery separator of a lithium ion secondary batteries charged in the battery case is welded, then LiPF6 at a concentration of 1mol / dm3 dissolved in EC / DMC = 1:1 electrolyte in a mixed solvent injected into the battery case is formed, the seal, a lithium ion secondary battery.

【实施例2】使用与实施例1所类似的方法,但是正极浆料组成为LiCoO2∶乙炔黑∶SBR∶CMC∶甲基硅油∶碳纤维=90∶3∶3∶1.5∶0.5∶2。 [Example 2] Using a procedure similar process as in Example, but the positive electrode slurry composition of simethicone :SBR:CMC: LiCoO2: acetylene black: carbon fibers = 90:3:3:1.5:0.5:2.

【实施例3】使用与实施例1所类似的方法,但是正极浆料组成为LiCoO2∶乙炔黑∶PTFE∶HPMC∶甲基硅油∶碳纤维=90∶3∶3∶1.5∶0.5∶2。 [Example 3] using a similar process as Examples, but the positive electrode slurry composition of simethicone :PTFE:HPMC: LiCoO2: acetylene black: carbon fibers = 90:3:3:1.5:0.5:2.

【实施例4】使用与实施例1所类似的方法,但是正极浆料组成为LiCoO2∶乙炔黑∶SBR∶HPMC∶甲基硅油∶碳纤维=90∶3∶3∶1.5∶0.5∶2。 [Example 4] using a similar process as in Example, but the positive electrode slurry composition of simethicone :SBR:HPMC: LiCoO2: acetylene black: carbon fibers = 90:3:3:1.5:0.5:2.

【比较例5】使用与实施例1所类似的方法,但是正极浆料组成为LiCoO2∶乙炔黑∶PTFE∶CMC∶甲基硅油∶=90∶4∶4∶1.5∶0.5。 [Comparative Example 5] Using a procedure similar process as in Example, but the positive electrode slurry composition of simethicone LiCoO2: acetylene black :PTFE:CMC:: = 90:4:4:1.5:0.5.

【比较例6】使用与实施例1所类似的方法,但是正极浆料组成为LiCoO2∶乙炔黑∶PTFE∶CMC∶碳纤维=90∶3∶3∶1.5∶2.5。 [Comparative Example 6] Using a procedure similar process as in Example, but the positive electrode slurry composition of acetylene black :PTFE:CMC: LiCoO2: = 90:3:3:1.5:2.5 carbon fibers.

【比较例1】使用与实施例1所类似的方法,但是正极片由以下方法得到:将一定量的PVDF以一定比率溶解在NMP中,将LiCoO2和乙炔黑加入该溶液中,充分混合制成浆料,其组成为LiCoO2∶乙炔黑∶PVDF=92∶4∶4。 [Comparative Example 1] Using a procedure similar process as Examples, but the positive electrode plate obtained by the following method: The amount of PVDF was dissolved in NMP at a constant rate, the LiCoO2 and acetylene black were added to the solution, and thoroughly mixed to obtain a slurry consisting of acetylene black LiCoO2: :PVDF = 92:4:4. 将该浆料均匀地涂布在20μm的铝箔上,于120℃下干燥。 The slurry was uniformly coated on an aluminum foil of 20μm, dried at 120 ℃. 压延后得到厚度为140μm的正极片。 After rolling to give a thickness of 140μm positive electrode sheet.

电池特性测试【放电性能】将按上述方法制成的锂离子二次电池以400mA的恒定电流充电至4.2V,在电压升至4.2V后以恒定电压充电,截至电流50mA;再以400mA的恒定电流放电,截至电压2.75V。 Battery characteristic test] [discharge performance as mentioned above are made of a lithium ion secondary battery at a constant current of 400mA until 4.2V, charged at a constant voltage after the voltage was raised to 4.2V, current as of 50mA; then constant at 400mA of discharge current, as the voltage 2.75V. 测定初始容量。 Determine the initial capacity.

【循环特性】将按上述方法制成的锂离子二次电池以上述的充放电机制充放电500次循环。 Made of a lithium ion secondary battery cycle characteristics [] as mentioned above are the above-mentioned charge-discharge mechanism 500 charge and discharge cycles. 测定在500次循环时的容量维持率。 Determination of the capacity retention rate at 500 cycles.

【负荷特性】 [Load characteristics]

将按上述方法制成的锂离子二次电池以400mA的恒定电流充电至4.2V,在电压升至4.2V后以恒定电压充电,截至电流50mA;再以2000mA的恒定电流放电,截至电压2.75V。 Lithium ion secondary battery will be made of the method of charging at a constant current of 400mA until 4.2V, charged at a constant voltage after the voltage was raised to 4.2V, current as of 50mA; 2000mA then discharged at a constant current, as the voltage 2.75V . 测定在高负荷条件下的容量维持率和放电中值电压。 Measured under conditions of high load capacity retention rate and discharge voltage values. 以上试验的结果如下表所示。 Results of the above tests are shown below.

锂离子二次电池性能测试结果 Secondary lithium ion battery performance test results

根据以上结果可见,各实施例的锂离子二次电池与采用有机系拉浆制片方法的比较例1相比,在维持电池初始容量基本不变的情况下,具有更为优良的循环性能和高倍率放电性能。 According to the above results can be seen, each of the embodiments the lithium ion secondary battery employing an organic pull Comparative Example 1 as compared to pulp production method, in the case where the initial capacity of the battery is maintained substantially constant, with more excellent cycle property and high rate discharge performance. 而实施例5和实施例6的综合性能相对实施例1~4有所下降,这说明了甲基硅油和碳纤维作为添加剂,对于改善正极层的密着性,增加附料强度,起着十分重要的作用。 The overall performance of the Example 6 Example 5 and Examples 1 to 4 relative decline, indicating that the carbon fibers and simethicone as an additive for improving the adhesion of the positive electrode layer, increasing the strength of attachment material, plays an important effect.

Claims (6)

1.一种制备锂离子二次电池的方法,其包含如下步骤:a正极浆料的配制;b将正极浆料均匀地涂布在电极集流体上,干燥、压延后得到一定厚度的正极片;c负极浆料的配制;d将负极浆料均匀地涂布在电极集流体上,干燥、压延后得到一定厚度的负极片;e将备制好的正、负极片与隔膜卷绕成电池芯,装入电池壳中并焊接,随后将电解液注入电池壳中,密封,制成锂离子二次电池;其特征在于:所述步骤a是将包括正极活性物质、碳系材料导电剂、水溶性粘合剂、增粘剂溶解在水中,搅拌均匀即制得正极浆料;该水溶性粘合剂由聚四氟乙烯PTFE或丁苯橡胶SBR的其中之一或其混合物组成,用量为正极活性物质的0.5~15.0wt%;该增粘剂为甲基纤维素MC、羧甲基纤维素钠CMC、羟丙基甲基纤维素HPMC、羧甲基羟乙基纤维素CMHEC和羟丙基纤维素HPC的其中之一或其混合 A method of preparing a lithium ion secondary battery, comprising the steps of: preparing a positive electrode slurry; b. The positive electrode slurry was uniformly coated on an electrode current collector, dried and rolled to obtain a thickness of the positive electrode sheet ; c negative electrode paste formulation; D negative electrode slurry was uniformly coated on an electrode current collector, dried and rolled to obtain a thickness of the negative electrode sheet; E the prepared ready-made positive, the negative electrode plate wound with the separator cell core, into the battery case and welded, then injected into the battery electrolyte, the seal, a lithium ion secondary battery; characterized in that: said step a is a positive electrode active material comprising a carbon-based material of the conductive agent, water-soluble binder, thickener dissolved in water, uniformly stirring to prepare a positive electrode slurry; the water soluble binder of polytetrafluoroethylene PTFE or styrene-butadiene rubber SBR or mixtures thereof, wherein one of an amount of 0.5 ~ 15.0wt% positive electrode active material; the thickener is methyl cellulose MC, sodium carboxymethyl cellulose CMC, hydroxypropyl methylcellulose HPMC, carboxymethylcellulose and hydroxypropyl hydroxyethyl cellulose CMHEC one or a mixture of cellulose HPC ,用量为正极活性物质的0.2~10.0wt%;所述步骤a的正极浆料中还包括甲基硅油或碳纤维其中之一或其混合物作为添加剂,其中甲基硅油的用量为正极活性物质的0.1~8.0wt%,碳纤维的用量为正极活性物质的0.1~15.0wt%。 , In an amount of 0.2 ~ 10.0wt% positive electrode active material; positive electrode slurry in the step a further comprises one or dimethicone or a mixture thereof wherein the carbon fibers as an additive, wherein the amount of simethicone for the positive electrode active material 0.1 ~ 8.0wt%, the amount of carbon fiber is 0.1 ~ 15.0wt% positive electrode active material.
2.根据权利要求1所述的制备锂离子二次电池的方法,其中步骤b所述正极片含有一种锂与过渡金属的层状复合氧化物,该层状复合氧化物包括下述化学式所表示的活性物质材料:LixNi1-yCoyO2,其中,0.9≤x≤1.1,0≤y≤1.0;LixMn2-yByO2,其中,B为过渡金属,0.9≤x≤1.1,0≤y≤1.0。 2. The method of manufacturing a lithium ion secondary battery according to claim 1, wherein in step b the positive electrode plate layered composite oxide containing lithium and a transition metal, the layered composite oxide comprising the following chemical formula active material represented: LixNi1-yCoyO2, wherein, 0.9≤x≤1.1,0≤y≤1.0; LixMn2-yByO2, wherein, B is a transition metal, 0.9≤x≤1.1,0≤y≤1.0.
3.根据权利要求1所述的制备锂离子二次电池的方法,其中步骤c所述负极浆料的溶剂为水。 3. The method of manufacturing a lithium ion secondary battery according to claim 1, said solvent wherein step c negative electrode slurry is water.
4.根据权利要求1所述的制备锂离子二次电池的方法,其特征在于:步骤d所述负极含有一种能够使锂离子反复嵌入和脱嵌的碳系材料,该碳系材料包括天然石墨、人造石墨、中间相炭微球MCMB、碳纤维MCF。 The method of producing a lithium ion secondary battery according to claim 1, wherein: said step d contains a negative electrode capable of lithium ions to repeat intercalation and deintercalation of carbon-based material, the carbon-based material comprising a natural stone ink, artificial graphite, mesophase carbon microbeads the MCMB, carbon fibers MCF.
5.根据权利要求1所述的制备锂离子二次电池的方法,其特征在于:步骤e所述电解液包含选自高氯酸锂、氯铝酸锂、六氟磷酸锂、四氟硼酸锂、卤化锂、氟烃基氟氧磷酸锂及氟烃基磺酸锂的锂盐,可以使用其中之一或其混合物。 5. The method of manufacturing a lithium ion secondary battery according to claim 1, wherein: said electrolyte comprises a step e is selected from lithium perchlorate, lithium aluminate chloride, lithium hexafluorophosphate, lithium tetrafluoroborate, lithium halide , the lithium salt lithium phosphate oxygen and a fluorocarbon group-fluoro hydrocarbon lithium fluoride acid may be used in which one or mixtures thereof.
6.根据权利要求1所述的制备锂离子二次电池的方法,其特征在于:步骤e所述电解液包含链状酸酯和环状酸酯的混合溶剂,链状酸酯选自碳酸二甲酯、碳酸二乙酯、碳酸甲乙酯、碳酸乙丙酯、碳酸二苯酯、乙酸甲酯、乙酸乙酯、丙酸甲酯、丙酸乙酯、以及其它含氟、含硫或含不饱和键的链状有机酯类,可以使用其中之一或其混合物。 6. A method of preparing a lithium ion secondary battery according to claim 1, wherein: the step of e the electrolyte comprises a mixed solvent of chain esters and cyclic esters, chain carbonic acid ester is selected from dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, ethyl propyl carbonate, diphenyl carbonate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, and other fluorine-containing, sulfur-containing or unsaturated organic esters bond chain, wherein one or a mixture may be used. 环状酸酯选自碳酸乙烯酯、碳酸丙烯酯、碳酸亚乙烯酯、γ-丁内酯、磺内酯以及其它含氟、含硫或含不饱和键的环状有机酯类,可以使用其中之一或其混合物。 Cyclic esters selected from ethylene carbonate, propylene carbonate, vinylene carbonate, [gamma] -butyrolactone, sultone, and other fluorine, sulfur or unsaturated bond-containing cyclic organic esters, which may be used one or a mixture thereof.
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