JP2015527719A - 正極活物質及びこの製造方法 - Google Patents
正極活物質及びこの製造方法 Download PDFInfo
- Publication number
- JP2015527719A JP2015527719A JP2015528425A JP2015528425A JP2015527719A JP 2015527719 A JP2015527719 A JP 2015527719A JP 2015528425 A JP2015528425 A JP 2015528425A JP 2015528425 A JP2015528425 A JP 2015528425A JP 2015527719 A JP2015527719 A JP 2015527719A
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- active material
- electrode active
- boron
- lithium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 46
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 75
- 229910052796 boron Inorganic materials 0.000 claims abstract description 75
- 229910002102 lithium manganese oxide Inorganic materials 0.000 claims abstract description 60
- VLXXBCXTUVRROQ-UHFFFAOYSA-N lithium;oxido-oxo-(oxomanganiooxy)manganese Chemical compound [Li+].[O-][Mn](=O)O[Mn]=O VLXXBCXTUVRROQ-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000011247 coating layer Substances 0.000 claims abstract description 54
- 239000011572 manganese Substances 0.000 claims description 96
- 239000002243 precursor Substances 0.000 claims description 85
- 229910052748 manganese Inorganic materials 0.000 claims description 55
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 54
- 239000002245 particle Substances 0.000 claims description 54
- 229910052744 lithium Inorganic materials 0.000 claims description 42
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 36
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- 238000000034 method Methods 0.000 claims description 24
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- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 12
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- MORCTKJOZRLKHC-UHFFFAOYSA-N lithium;oxoboron Chemical compound [Li].O=[B] MORCTKJOZRLKHC-UHFFFAOYSA-N 0.000 claims description 10
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- PSHMSSXLYVAENJ-UHFFFAOYSA-N dilithium;[oxido(oxoboranyloxy)boranyl]oxy-oxoboranyloxyborinate Chemical compound [Li+].[Li+].O=BOB([O-])OB([O-])OB=O PSHMSSXLYVAENJ-UHFFFAOYSA-N 0.000 claims description 2
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- 159000000002 lithium salts Chemical class 0.000 description 2
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Images
Classifications
-
- 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
-
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Abstract
Description
MnSO4及びAlSO4を(98:2)で混合した後、N2パージングを経た蒸溜水を用いて濃度が2MであるAlSO4を含むMnSO4・7H2Oを製造した。製造されたMnSO4・7H2Oを連続撹拌タンク反応器(CSTR、製造社:EMSTech、製品名:CSTR−L0)に250mL/hの速度で投入した。
<多結晶リチウムマンガン酸化物粒子の製造>
段階i):ホウ素含有化合物がコーティングされた多結晶マンガン前駆体を得る段階
ホウ酸0.62gをエチルアルコール1Lに入れて溶解させた後、前記溶液に製造例1で製造された5μmの平均粒径を有する(Mn0.95Al0.05)3O4 141.88gを共に1Lボトル(bottle)に入れて、1時間の間400rpmで撹拌した。撹拌して得た前記混合溶液を遠心分離後に150℃から24時間乾燥し、ホウ素含有化合物(B(OH)3)がコーティングされた多結晶マンガン前駆体を得た。
前記段階i)で得たホウ素含有化合物(B(OH)3)がコーティングされた多結晶マンガン前駆体135g及びリチウム前駆体としてLi2CO337.50gを共にミキサー(Waring Blender)に入れて、前記ミキサーの中心部rpmが18000rpmで、1分間混合して前駆体混合物を得た。
Li2CO3 37.50g、製造例1で製造された5μmの平均粒径を有する(Mn0.95Al0.05)3O4 141.88g、ホウ酸0.62gをミキサー(Waring Blender)に入れて、前記ミキサーの中心部rpmが18000rpmで、1分間混合した。前記混合された粉末を500ccのアルミナるつぼに入れて約700℃で4時間の間大気(Air)雰囲気で焼成を行った。焼成後に得たケーキ(cake)を乳ばちで粉砕した後、400メッシュ篩(sieve)を用いて分級を行って表面にLi2B4O7、LiBO3、及びB2O3を含むコーティング層を含むLi(1.09)Mn1.81Al0.1O4を得た。
実施例1の段階i)を行わず、段階ii)でホウ素含有化合物がコーティングされた多結晶マンガン前駆体を用いる代わりに、コーティングされない多結晶マンガン前駆体を用いたことを除き、前記実施例1と同一の方法で行って、Li(1.09)Mn1.81Al0.1O4を得た。
マンガン前駆体として製造例1で製造された多結晶(Mn0.95Al0.05)3O4を用いる代わりに単結晶Mn3O4を用いたことを除いては、前記実施例1と同一の方法で行い、Li2B4O7、LiBO3、及びB2O3を含むコーティング層を含むLiMn2O4を得た。
<リチウム二次電池の製造>
正極の製造
前記実施例1で製造された正極活物質94重量%、導電剤としてカーボンブラック(carbon black)3重量%、バインダとしてポリビニリデンフルオライド(PVdF)3重量%を、溶媒であるN−メチル−2−ピロリドン(NMP)に添加して正極混合物スラリーを製造した。前記正極混合物スラリーを厚さが20μm程度の正極集電体であるアルミニウム(Al)薄膜に塗布し、乾燥して正極を製造した後、ロールプレス(roll press)を行って正極を製造した。
負極活物質として炭素粉末96.3重量%、導電剤としてsuper−p 1.0重量%及びバインダとしてスチレンブタジエンゴム(SBR)及びカルボキシメチルセルロース(CMC)を1.5重量%と1.2重量%を混合し、溶媒であるNMPに添加して負極活物質スラリーを製造した。前記負極活物質スラリーを厚さが10umの負極集電体である銅(Cu)薄膜に塗布し、乾燥して負極を製造した後、ロールプレス(roll press)を行って負極を製造した。
一方、電解質としてエチレンカーボネート及びジエチルカーボネートを30:70の体積比で混合して製造された非水電解液溶媒にLiPF6を添加して、1MのLiPF6非水性電解液を製造した。
このように製造された正極と負極を、ポリエチレンとポリプロピレンの混合セパレータを介在させた後、通常の方法でポリマー型電池を製作した後、製造された前記非水性電解液を注液してリチウム二次電池の製造を完成した。
前記実施例2で製造された正極活物質を用いたことを除いては、実施例3と同一の方法でリチウム二次電池を製造した。
前記比較例1及び2で製造された正極活物質を用いたことを除いては、実施例3と同一の方法でリチウム二次電池を製造した。
前記実施例1と2、及び比較例1と2で製造された正極活物質に対して、それぞれSEM顕微鏡写真を確認し、その結果をそれぞれ図2から5に示した。具体的に検討してみれば、図2及び図3のように、本発明の実施例1及び2によって製造された正極活物質は、多結晶リチウムマンガン酸化物の表面にホウ素含有コーティング層を含み、エッジ(角)が丸い形態の表面を有することを確認することができる。
実施例1と2、及び比較例1と2で製造された多結晶リチウムマンガン酸化物粒子に対してX線回折分析を行った。その結果を下記表1で示した。
実施例3と4、及び比較例3と4で製造されたリチウム二次電池を定電流/定電圧(CC/CV)条件で、(電池容量3.4mAh)を2Cの定電流(CC)で充電し、その後、定電圧(CV)で充電して充電電流が0.17mAhになるまで1回目の充電を行った。その後20分間放置した後、0.1Cの定電流で10mVになるまで放電して1サイクル目の放電容量を測定した。次いで、各電池に対して前記充電及び放電を繰り返して行って容量を測定し、これを下記表2で示した。
タップ密度は、実施例1、及び比較例1と2で得た正極活物質を容器に充填した後、一定の条件で振動させて得られる粒子の見掛け密度を測定したものである。
実施例1と2、及び比較例1の正極活物質の結晶の大きさを測定した。
Claims (32)
- 多結晶リチウムマンガン酸化物;及び
前記多結晶リチウムマンガン酸化物の表面にホウ素含有コーティング層を含む正極活物質。 - 前記ホウ素含有コーティング層は、リチウムホウ素酸化物、ホウ素酸化物、またはこれらの混合物を含む請求項1または請求項2に記載の正極活物質。
- 前記リチウムホウ素酸化物は、LiaBbOd(1≦a≦4、1≦b≦4、1≦d≦8)を含み、ホウ素酸化物はBxOy(1≦x≦4、1≦y≦4である)を含む請求項3に記載の正極活物質。
- 前記ホウ素含有コーティング層は、Li2B4O7、LiBO3、及びB2O3からなる群より選択されたいずれか一つ、またはこれらのうち2種以上の混合物を含む請求項1から請求項4の何れか一項に記載の正極活物質。
- 前記ホウ素含有コーティング層は、前記リチウムホウ素酸化物及びホウ素酸化物が反応して生成された反応物をさらに含む請求項5に記載の正極活物質。
- 前記ホウ素含有コーティング層は、リチウムホウ素酸化物及びホウ素酸化物の混合酸化物を1:1から4の重量比で含む請求項4から請求項6の何れか一項に記載の正極活物質。
- 前記ホウ素含有コーティング層の厚さは、1nmから500nmの範囲である請求項1から請求項7の何れか一項に記載の正極活物質。
- 前記多結晶リチウムマンガン酸化物粒子は、152nmから300nm範囲の平均結晶の大きさを有する二つ以上の一次粒子が凝集された二次粒子の形態である請求項1から請求項8の何れか一項に記載の正極活物質。
- 前記二次粒子の平均粒径D50は、3μmから20μmの範囲である請求項9に記載の正極活物質。
- 前記正極活物質のタップ密度は、1.7g/ccから2.5g/ccの範囲である請求項1から請求項10の何れか一項に記載の正極活物質。
- 前記正極活物質は、X線回折分析(X−ray diffraction)測定時にI(111)/I(111)ピーク強度比を100%と定義する場合、I(311)/I(111)が40%以上である請求項1から請求項11の何れか一項に記載の正極活物質。
- 前記正極活物質は、X線回折分析(X−ray diffraction)測定時にI(111)/I(111)ピーク強度比を100%と定義する場合、I(400)/I(111)が40%以上であり、I(440)/I(111)が20%以上である請求項1から請求項12の何れか一項に記載の正極活物質。
- 前記正極活物質は、X線回折分析(X−ray diffraction)測定時に、(311)ピークの半値幅(Full Width at Half−Maximum;FWHM)が0.3度以下である請求項1から請求項13の何れか一項に記載の正極活物質。
- 前記正極活物質の比表面積(BET)は、0.1m2/gから1.0m2/gの範囲である請求項1から請求項14の何れか一項に記載の正極活物質。
- 前記リチウムマンガン酸化物の内部にホウ素含有酸化物の一部のB元素がドーピングされ、前記B元素の含量は前記リチウムマンガン酸化物の表面から内部に行くほど減少する濃度勾配を有する請求項1から請求項15の何れか一項に記載の正極活物質。
- (i)多結晶マンガン前駆体及びホウ素前駆体を混合して熱処理し、多結晶マンガン前駆体の表面をホウ素含有化合物でコーティングさせる段階;及び
(ii)前記ホウ素含有化合物がコーティングされたマンガン前駆体及びリチウム前駆体を混合した後、焼成して多結晶リチウムマンガン酸化物の表面にホウ素含有コーティング層を形成する段階
を含む請求項1から請求項16の何れか一項に記載の正極活物質の製造方法。 - 多結晶マンガン前駆体、ホウ素前駆体及びリチウム前駆体を混合して焼成する段階を含む請求項1から請求項16の何れか一項に記載の正極活物質の製造方法。
- 前記熱処理前に固液分離工程を行う段階をさらに含む請求項17に記載の正極活物質の製造方法。
- 前記固液分離工程は、遠心分離、フィルタプレス、フィルタドライ及びスプレードライ方法のうち選択された一つ以上の方法によって行われる請求項19に記載の正極活物質の製造方法。
- 前記多結晶マンガン前駆体は、100nmから300nm範囲の平均結晶の大きさを有する二つ以上の一次粒子が凝集されて形成された二次粒子の形態である請求項17から請求項20の何れか一項に記載の正極活物質の製造方法。
- 前記多結晶マンガン前駆体は、Alを0.01重量%から10重量%で含む請求項17から請求項21の何れか一項に記載の正極活物質の製造方法。
- 前記多結晶マンガン前駆体は、(Mn(1−y)Aly)3O4(0<y≦0.2)を含む請求項22に記載の正極活物質の製造方法。
- 前記多結晶マンガン前駆体は、MnO2、MnCl2、MnCO3、Mn3O4、MnSO4及びMn2O3からなる群より選択されたいずれか一つ、またはこれらのうち2種以上の混合物をアルミニウム化合物とともに共沈させて形成されたものである請求項23に記載の正極活物質の製造方法。
- 前記アルミニウム化合物は、AlSO4、AlCl及びAlNO3からなる群より選択されたいずれか一つ、またはこれらのうち2種以上の混合物である請求項24に記載の正極活物質の製造方法。
- 前記ホウ素前駆体は、ホウ酸、四ホウ酸リチウム、酸化ホウ素及びホウ酸アンモニウムからなる群より選択されたいずれか一つ、またはこれらのうち2種以上の混合物である請求項17から請求項25の何れか一項に記載の正極活物質の製造方法。
- 前記ホウ素前駆体は、多結晶マンガン前駆体の総重量対比0.01重量%から20重量%の量で用いられる請求項17から請求項26の何れか一項に記載の正極活物質の製造方法。
- 前記ホウ素含有化合物は、B(OH)3、B2O3、H3BO3、B2O5、LiBO3、Li2B4O7及びNa2B4O7からなる群より選択されたいずれか一つ、またはこれらのうち2種以上の混合物である請求項17に記載の正極活物質の製造方法。
- 前記焼成は、600℃以上から900℃の温度範囲で行われる請求項17に記載の正極活物質の製造方法。
- 前記焼成は、600℃以上から800℃未満の温度範囲で行われる請求項19に記載の正極活物質の製造方法。
- 請求項1から請求項16の何れか一項に記載の正極活物質を含む正極。
- 請求項31に記載の正極を含むリチウム二次電池。
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