CN105428592A - 一种锂离子电池的正极 - Google Patents

一种锂离子电池的正极 Download PDF

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Publication number
CN105428592A
CN105428592A CN201510985432.7A CN201510985432A CN105428592A CN 105428592 A CN105428592 A CN 105428592A CN 201510985432 A CN201510985432 A CN 201510985432A CN 105428592 A CN105428592 A CN 105428592A
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lithium ion
ion battery
anode
active material
conductive additive
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王海波
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Suzhou Gerui Dynamic Power Technology Co Ltd
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Suzhou Gerui Dynamic Power Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621—Binders
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

本发明公开了一种锂离子电池的正极，由正极材料和集流体组成，正极材料包括正极活性物质、导电添加剂和粘结材料，其中，正极活性物质为镍钴酸锂；导电添加剂为碳纳米管；粘结材料为水基粘结剂。本发明中公开的锂离子电池正极采用环保材料，成本低，且具有良好的导电性能。

Description

一种锂离子电池的正极
技术领域
本发明涉及一种锂离子电池的正极。
背景技术
锂离子电池应用领域广，包括手机、笔记本电脑等电子终端设备，甚至是走向了电动汽车和储能技术领域；锂离子电池从结构上分为正极、负极、隔膜、电解液和外壳。其中，正极材料一般包括正极活性物质、导电剂和粘结剂。
在电极中,粘结剂是用来将电极活性物质粘附在集流体上的高分子化合物。它的主要作用是粘结和保持活性物质，增强电极活性材料与导电剂以及活性材料与集流体之间的电子接触，更好地稳定极片的结构，对于在充放电过程中体积会膨胀/收缩的锂离子电池正负极来说，要求粘结剂对此能够起到一定的缓冲作用，因此选择一种合适的粘结剂非常重要。
锂离子电池用粘结剂主要分为两类，一类是有机溶剂型粘合剂，采用有机溶剂作为分散剂；一类是水基型粘结剂，采用水作为分散剂。选择一种合适的锂离子电池粘结剂，要求其欧姆电阻要小,在电解液中性能稳定,不膨胀、不松散、不脱粉。一般而言,粘结剂的性能,如粘结力、柔韧性、耐碱性、亲水性等,直接影响着电池的性能。加入最佳量的粘结剂,可以获得较大的容量、较长的循环寿命和较低的内阻,这对提高电池的循环性能、快速充放能力以及降低电池的内压等具有促进作用。
发明内容
本发明的目的是提供一种锂离子电池的正极，使锂离子电池具有更好的导电性能、循环稳定性以及安全环保性。
为实现上述目的，本发明的技术方案为：
一种锂离子电池的正极，由正极材料和集流体组成，其中，正极材料包括正极活性物质、导电添加剂以及粘结材料，集流体为铝箔；在上述正极材料中，各组分按重量百分比计，正极活性物质：导电添加剂：粘结材料为93-97:1-2:1-3；其中，正极活性物质为镍钴酸锂；导电添加剂为碳纳米管；粘结材料为水基粘结剂。
更具体地，该水基粘结剂包括90-92%的明胶，5-8%的聚乙烯醇和3-5%的硅烷化合物；其中，聚乙烯醇有利于提高水基粘结剂的粘结性和延展性，硅烷化合物有利于提高水基粘结剂对无机材料的亲和力。
更具体地，该水基粘结剂包括92%的明胶，5%的聚乙烯醇和3%的硅烷化合物。
本发明的优点和有益效果在于：
1）采用水基粘合剂替代传统的聚偏氟乙烯作为粘结剂，符合环保要求，且成本低，安全性能高，且水基粘结剂作为锂离子电池的正极材料添加剂电阻低，有利于提高电池的整体导电性能。
2）本发明中的水基粘合剂具有良好的亲和力和延展性，能够缓冲正极材料在充放电时的体积变化，防止发生材料脱落和剥离等现象。
具体实施方式
下面结合实施例，对本发明的具体实施方式作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。
本发明具体实施的技术方案是：
一种锂离子电池的正极，由正极材料和集流体组成，其中，正极材料包括正极活性物质、导电添加剂以及粘结材料，集流体为铝箔；在上述正极材料中，各组分按重量百分比计，正极活性物质：导电添加剂：粘结材料为95:2:3；其中，正极活性物质为镍钴酸锂；导电添加剂为碳纳米管；粘结材料为水基粘结剂，该水基粘结剂包括92%的明胶，5%的聚乙烯醇和3%的硅烷化合物。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (3)

1.一种锂离子电池的正极，由正极材料和集流体组成，所述的正极材料包括正极活性物质、导电添加剂以及粘结材料，所述的集流体为铝箔；其特征在于，所述的正极材料中，各组分按重量百分比计，正极活性物质：导电添加剂：粘结材料为93-97:1-2:1-3；其中，所述的正极活性物质为镍钴酸锂；所述的导电添加剂为碳纳米管；所述的粘结材料为水基粘结剂。
2.根据权利要求1中所述的锂离子电池的正极，其特征在于，所述的水基粘结剂包括90-92%的明胶，5-8%的聚乙烯醇和3-5%的硅烷化合物。
3.根据权利要求2中所述的锂离子电池的正极，其特征在于，所述的水基粘结剂包括92%的明胶，5%的聚乙烯醇和3%的硅烷化合物。
CN201510985432.7A 2015-12-25 2015-12-25 一种锂离子电池的正极 Pending CN105428592A (zh)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1485940A (zh) * 2003-08-26 2004-03-31 北大先行科技产业有限公司 锂离子电池的电极及其制备方法和锂离子电池
CN1810909A (zh) * 2005-01-25 2006-08-02 深圳市比克电池有限公司 水性粘接剂的制备方法及电池
CN102827541A (zh) * 2011-11-28 2012-12-19 中航锂电（洛阳）有限公司 一种涂料、采用该涂料制备的水性柔韧正极片、锂离子电池

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1485940A (zh) * 2003-08-26 2004-03-31 北大先行科技产业有限公司 锂离子电池的电极及其制备方法和锂离子电池
CN1810909A (zh) * 2005-01-25 2006-08-02 深圳市比克电池有限公司 水性粘接剂的制备方法及电池
CN102827541A (zh) * 2011-11-28 2012-12-19 中航锂电（洛阳）有限公司 一种涂料、采用该涂料制备的水性柔韧正极片、锂离子电池

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Application publication date: 20160323