JP2023541806A - リチウム二次電池用電極組立体およびそれを含むリチウム二次電池 - Google Patents
リチウム二次電池用電極組立体およびそれを含むリチウム二次電池 Download PDFInfo
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- JP2023541806A JP2023541806A JP2023513506A JP2023513506A JP2023541806A JP 2023541806 A JP2023541806 A JP 2023541806A JP 2023513506 A JP2023513506 A JP 2023513506A JP 2023513506 A JP2023513506 A JP 2023513506A JP 2023541806 A JP2023541806 A JP 2023541806A
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- Prior art keywords
- positive electrode
- lithium secondary
- secondary battery
- weight
- negative electrode
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 62
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 57
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000010703 silicon Substances 0.000 claims abstract description 39
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 39
- 239000000654 additive Substances 0.000 claims abstract description 34
- 230000000996 additive effect Effects 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000007773 negative electrode material Substances 0.000 claims abstract description 21
- 239000002131 composite material Substances 0.000 claims description 74
- 239000000126 substance Substances 0.000 claims description 54
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 50
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims description 24
- 239000003575 carbonaceous material Substances 0.000 claims description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 19
- 239000007774 positive electrode material Substances 0.000 claims description 14
- 239000004020 conductor Substances 0.000 claims description 13
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- 238000000926 separation method Methods 0.000 claims description 10
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- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
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- 235000012239 silicon dioxide Nutrition 0.000 claims description 7
- 229910052712 strontium Inorganic materials 0.000 claims description 7
- 229910052721 tungsten Inorganic materials 0.000 claims description 7
- 229910052720 vanadium Inorganic materials 0.000 claims description 7
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
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- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 description 2
- 229910013733 LiCo Inorganic materials 0.000 description 2
- 229910014689 LiMnO Inorganic materials 0.000 description 2
- 229910011328 LiNi0.6Co0.2Mn0.2O2 Inorganic materials 0.000 description 2
- 229910013870 LiPF 6 Inorganic materials 0.000 description 2
- 229910001228 Li[Ni1/3Co1/3Mn1/3]O2 (NCM 111) Inorganic materials 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
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- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
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- 230000000694 effects Effects 0.000 description 2
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Abstract
Description
本発明は、一実施形態において、
正極活物質と下記化学式1で示す正極添加剤を正極合材層に含む正極と、
負極活物質として炭素物質およびケイ素(Si)含有物質を負極合材層に含む負極と、
上記正極と負極の間に位置する分離膜と、を具備し、
上記正極添加剤の含有量は、正極合材層100重量部に基づいて0.01~5重量部であり、かつ、
正極合材層全重量に基づいて正極添加剤の含有量百分率CRLipと負極合材層全重量に基づいてケイ素(Si)含有物質の含有量百分率CRSiとの比CRLip/CRSiが、0.03~0.30であるリチウム二次電池用電極組立体を提供する:
LipCo(1-q)M1 qO4
M1は、W、Cu、Fe、V、Cr、Ti、Zr、Zn、Al、In、Ta、Y、La、Sr、Ga、Sc、Gd、Sm、Ca、Ce、Nb、Mg、B、およびMoからなる群から選ばれる1種以上の元素であり、
pおよびqは、それぞれ5≦p≦7および0≦q≦0.5である。
Lix[NiyCozMnwM2 v]Ou
M2は、W、Cu、Fe、V、Cr、Ti、Zr、Zn、Al、In、Ta、Y、La、Sr、Ga、Sc、Gd、Sm、Ca、Ce、Nb、Mg、B、およびMoからなる群から選ばれる1種以上の元素であり、
x、y、z、w、vおよびuは、それぞれ1.0≦x≦1.30、0≦y<0.95、0<z≦0.5、0<w≦0.5、0≦v≦0.2、1.5≦u≦4.5である。
ここで、上記正極合材層は、天然黒鉛、人造黒鉛、カーボンブラック、アセチレンブラック、ケッチェンブラックおよび炭素繊維からなる群から選ばれる1種以上の導電材を含んでもよい。
上述した本発明による電極組立体を含むリチウム二次電池を提供する。
本発明は、一実施形態において、
正極活物質と下記化学式1で示す正極添加剤を正極合材層に含む正極と、
負極活物質として炭素物質およびケイ素(Si)含有物質を負極合材層に含む負極と、
上記正極と負極の間に位置する分離膜と、を具備し、
上記正極添加剤の含有量は、正極合材層100重量部に基づいて0.01~5重量部であり、かつ、
正極合材層全重量に基づいて正極添加剤の含有量百分率CRLipと負極合材層全重量に基づいてケイ素(Si)含有物質の含有量百分率CRSiとの比CRLip/CRSiが、0.03~0.30である、リチウム二次電池用電極組立体を提供する:
LipCo(1-q)M1 qO4
M1は、W、Cu、Fe、V、Cr、Ti、Zr、Zn、Al、In、Ta、Y、La、Sr、Ga、Sc、Gd、Sm、Ca、Ce、Nb、Mg、B、およびMoからなる群から選ばれる1種以上の元素であり、
pおよびqは、それぞれ5≦p≦7および0≦q≦0.5である。
Lix[NiyCozMnwM2 v]Ou
M2は、W、Cu、Fe、V、Cr、Ti、Zr、Zn、Al、In、Ta、Y、La、Sr、Ga、Sc、Gd、Sm、Ca、Ce、Nb、Mg、B、およびMoからなる群から選ばれる1種以上の元素であり、
x、y、z、w、vおよびuは、それぞれ1.0≦x≦1.30、0≦y<0.95、0<z≦0.5、0<w≦0.5、0≦v≦0.2、1.5≦u≦4.5である。
LipCo(1-q)M1 qO4
M1は、W、Cu、Fe、V、Cr、Ti、Zr、Zn、Al、In、Ta、Y、La、Sr、Ga、Sc、Gd、Sm、Ca、Ce、Nb、Mg、B、およびMoからなる群から選ばれる1種以上の元素であり、
pおよびqは、それぞれ5≦p≦7および0≦q≦0.5である。
また、本発明は、一実施形態において、
上述した電極組立体を含むリチウム二次電池を提供する。
しかも、本発明は、一実施形態において、上述した二次電池を単位電池として含む電池モジュールを提供し、上記電池モジュールを含む電池パックを提供する。
ホモミキサー(homo mixer)にN-メチルピロリドン溶媒を注入し、正極合材層を構成するために、正極活物質としてのLiNi0.8Co0.1Mn0.1O2、導電材としてのカーボンブラック、バインダーとしてのPVDFおよび正極添加剤としてのLi6CoO4を下記表1および表2に示されたように秤量して投入し、3,000rpmで60分間混合して、正極スラリーをそれぞれ準備した。準備した正極スラリーをアルミニウム集電体の一面に塗布した後、100℃で乾燥し、圧延して、正極を製造した。このとき、正極合材層の総厚さおよび平均面積は、それぞれ130μmおよび1260±50mm2であり、製造された正極の総厚さは、約200μmであった。
本発明によって製造された電極組立体の性能を評価するために、下記のような実験を行った。
実施例1~6と比較例1~8で準備したセルに対して、25℃で0.1C/0.1Cの条件で1回充放電を実施して、化成(formation)を行うことで、発生する酸素ガス量を分析し、その結果を下記表3に示した。
実施例1~6と比較例1~8で製作されたセルに対して25℃の温度で0.05Cの充電電流で充電終止電圧4.2~4.25Vまで充電し、0.02Vで電流密度が0.01Cとなるまで充電した。以後、0.05Cの放電電流で終止電圧2Vまで放電させて、1回充放電(≒初期充放電)を行い、行うときにセルの充放電容量を測定して、下記式1によって初期効率を算出した。1回充放電後には0.5Cの電流で充放電して100サイクルを繰り返し行い、初期充放電時と同じ方式でセルの充放電容量を測定し、下記式2によって100回充放電後の容量保持率を算出した。その結果を下記表3に示した。
初期効率(%)=(1回目の放電容量/1回目の充電容量)×100
容量保持率(%)=(100回目の放電容量/1回目の放電容量)×100
Claims (12)
- 正極活物質と下記化学式1で示す正極添加剤を正極合材層に含む正極と、
負極活物質として炭素物質およびケイ素(Si)含有物質を負極合材層に含む負極と、
前記正極と負極の間に位置する分離膜と、を具備し、
前記正極添加剤の含有量は、正極合材層100重量部に基づいて0.01~5重量部であり、かつ、
正極合材層全重量に基づいて正極添加剤の含有量百分率CRLipと負極合材層全重量に基づいてケイ素(Si)含有物質の含有量百分率CRSiとの比CRLip/CRSiが、0.03~0.30である、リチウム二次電池用電極組立体:
[化学式1]
LipCo(1-q)M1 qO4
前記化学式1中、
M1は、W、Cu、Fe、V、Cr、Ti、Zr、Zn、Al、In、Ta、Y、La、Sr、Ga、Sc、Gd、Sm、Ca、Ce、Nb、Mg、B、およびMoからなる群から選ばれる1種以上の元素であり、
pおよびqは、それぞれ5≦p≦7および0≦q≦0.5である。 - 正極合材層全重量に基づいて正極添加剤の含有量百分率CRLipと負極合材層全重量に基づいてケイ素(Si)含有物質の含有量百分率CRSiとの比CRLip/CRSiが、0.05~0.20である、請求項1に記載のリチウム二次電池用電極組立体。
- 正極添加剤は、空間群がP42/nmcである正方晶系構造を有する、請求項1に記載のリチウム二次電池用電極組立体。
- 正極活物質は、下記化学式2で示すリチウム金属複合酸化物である、請求項1に記載のリチウム二次電池用電極組立体:
[化学式2]
Lix[NiyCozMnwM2 v]Ou
前記化学式2中、
M2は、W、Cu、Fe、V、Cr、Ti、Zr、Zn、Al、In、Ta、Y、La、Sr、Ga、Sc、Gd、Sm、Ca、Ce、Nb、Mg、B、およびMoからなる群から選ばれる1種以上の元素であり、
x、y、z、w、vおよびuは、それぞれ1.0≦x≦1.30、0≦y<0.95、0<z≦0.5、0<w≦0.5、0≦v≦0.2、1.5≦u≦4.5である。 - 炭素物質は、天然黒鉛、人造黒鉛、グラフェンおよびカーボンナノチューブからなる群から選ばれる1種以上を含む、請求項1に記載のリチウム二次電池用電極組立体。
- 炭素物質は、グラフェンおよびカーボンナノチューブのうち1種以上を含み、かつ、炭素物質全体100重量部に対して0.1~10重量部で含む、請求項5に記載のリチウム二次電池用電極組立体。
- 正極合材層は、全重量に対して0.1~5重量部の導電材を含む、請求項1に記載のリチウム二次電池用電極組立体。
- 正極合材層は、天然黒鉛、人造黒鉛、カーボンブラック、アセチレンブラック、ケッチェンブラックおよび炭素繊維からなる群から選ばれる1種以上の導電材を含む、請求項1に記載のリチウム二次電池用電極組立体。
- ケイ素(Si)含有物質は、ケイ素(Si)、一酸化ケイ素(SiO)および二酸化ケイ素(SiO2)のうち1種以上を含む、請求項1に記載のリチウム二次電池用電極組立体。
- 正極合材層の平均厚さが、50μm~300μmであり、
負極合材層の平均厚さが、100~300μmである、請求項1に記載のリチウム二次電池用電極組立体。 - 負極合材層と正極合材層との平均面積比が、1.0~1.1である、請求項1に記載のリチウム二次電池用電極組立体。
- 請求項1に記載の電極組立体を含むリチウム二次電池。
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US9742004B2 (en) * | 2013-09-05 | 2017-08-22 | Lg Chem, Ltd. | Cathode additives for lithium secondary battery with high capacity |
JP6201642B2 (ja) | 2013-10-29 | 2017-09-27 | 株式会社豊田自動織機 | 蓄電装置 |
WO2017183653A1 (ja) | 2016-04-21 | 2017-10-26 | 株式会社豊田自動織機 | 正極用材料 |
KR20180023696A (ko) | 2016-08-26 | 2018-03-07 | 주식회사 엘지화학 | 이차전지 제조 방법 |
JP6944641B2 (ja) | 2017-04-24 | 2021-10-06 | トヨタ自動車株式会社 | リチウムイオン二次電池およびその製造方法 |
CN107104245A (zh) * | 2017-05-03 | 2017-08-29 | 南京安普瑞斯有限公司 | 一种锂离子电池 |
JP2019046689A (ja) | 2017-09-04 | 2019-03-22 | 株式会社豊田自動織機 | リチウムイオン二次電池 |
JP6962154B2 (ja) | 2017-11-27 | 2021-11-05 | 株式会社豊田自動織機 | リチウムイオン二次電池 |
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JP2019145402A (ja) | 2018-02-22 | 2019-08-29 | 株式会社豊田自動織機 | リチウムイオン二次電池 |
CN110224169B (zh) * | 2018-03-01 | 2021-09-14 | 安普瑞斯(南京)有限公司 | 一种高能量密度锂离子电池 |
KR102644858B1 (ko) * | 2018-11-30 | 2024-03-06 | 주식회사 엘지에너지솔루션 | 양극 합제용 첨가제 조성물, 이의 제조 방법, 및 이를 포함하는 양극 합제 슬러리 조성물 |
JP7443378B2 (ja) | 2019-01-15 | 2024-03-05 | テスラ・インコーポレーテッド | プレリチウム化エネルギー貯蔵デバイスのための組成物及び方法 |
KR102631720B1 (ko) * | 2019-11-07 | 2024-01-31 | 주식회사 엘지에너지솔루션 | 리튬 이차전지의 제조방법 |
KR20210067353A (ko) | 2019-11-29 | 2021-06-08 | 주식회사 아우룸블록체인 | 블록체인 상의 다중서명 전자계약으로 개인의 통제권을 강화하여 의료기록을 저장하고 정보제공하는 방법 및 시스템 |
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CN115989609A (zh) | 2023-04-18 |
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WO2022250325A1 (ko) | 2022-12-01 |
EP4191730A4 (en) | 2024-08-14 |
EP4191730A1 (en) | 2023-06-07 |
KR20220160140A (ko) | 2022-12-06 |
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