JP2023511033A - リチウム二次電池用正極活物質の製造方法および前記方法により製造されたリチウム二次電池用正極活物質 - Google Patents
リチウム二次電池用正極活物質の製造方法および前記方法により製造されたリチウム二次電池用正極活物質 Download PDFInfo
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- metal oxide
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- 239000002356 single layer Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical class O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000002733 tin-carbon composite material Substances 0.000 description 1
- 150000003624 transition metals Chemical group 0.000 description 1
- BDZBKCUKTQZUTL-UHFFFAOYSA-N triethyl phosphite Chemical compound CCOP(OCC)OCC BDZBKCUKTQZUTL-UHFFFAOYSA-N 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明者らは、リチウム遷移金属酸化物に炭素系コーティング層を形成する時に、特定の構造を有する炭素系物質を使用し、且つメカノフュージョン(mechanofusion)法により炭素系コーティング層を形成することで、リチウム遷移金属酸化物の構造の変更なしに、その表面に均一且つ薄いコーティング層を形成することができることを見出し、本発明を完成するに至った。
また、本発明は、上述の方法により製造される正極活物質を提供し、具体的には、前記正極活物質は、リチウム遷移金属酸化物と、前記リチウム遷移金属酸化物の表面に形成された炭素コーティング層とを含み、前記炭素コーティング層は、前記リチウム遷移金属酸化物の表面に形成されるものであり、前記炭素コーティング層の厚さは500nm以下であり、BET比表面積が0.5m2/g~50m2/gである。
また、本発明は、上述の方法により製造された正極活物質を含むリチウム二次電池用正極を提供する。
また、本発明は、前記正極を含む電気化学素子を製造することができる。前記電気化学素子は、具体的には、電池、キャパシタなどであることができ、より具体的には、リチウム二次電池であることができる。
実施例1
LiNi0.6Co0.2Mn0.2O2で表されるリチウム遷移金属酸化物と下記表1のスペックを有する中空構造(hollow structure)のカーボンブラックをリチウム遷移金属酸化物500gに対してカーボンブラックが1重量%になるようにペイントシェーカー(1400 Al classic shaker、Red Devil社製)に投入し、60分間混合して、遷移金属酸化物と中空構造のカーボンブラックが均一に分散されるように混合した。
リチウム遷移金属酸化物200gに対してカーボンブラックが1重量%になるように混合する以外は、前記実施例1と同一の方法でリチウム遷移金属酸化物上に厚さ250nmの炭素コーティング層が形成された正極活物質を製造した。
リチウム遷移金属酸化物100gに対してカーボンブラックが1重量%になるように混合する以外は、前記実施例1と同一の方法でリチウム遷移金属酸化物上に厚さ250nmの炭素コーティング層が形成された正極活物質を製造した。
リチウム遷移金属酸化物50gに対してカーボンブラックが1重量%になるように混合する以外は、前記実施例1と同一の方法でリチウム遷移金属酸化物上に厚さ250nmの炭素コーティング層が形成された正極活物質を製造した。
LiNi0.6Co0.2Mn0.2O2で表されるリチウム遷移金属酸化物と下記表1のスペックを有する中空構造(hollow structure)のカーボンブラックをリチウム遷移金属酸化物500gに対してカーボンブラックが1重量%になるようにペイントシェーカー(1400 Al classic shaker、Red Devil社製)に投入し、60分間混合して、遷移金属酸化物と中空構造のカーボンブラックが均一に分散されるように混合し、リチウム遷移金属酸化物とカーボンブラックが均一に混合された混合物を製造し、これを正極活物質として使用した。
炭素コーティング層を形成していないリチウム遷移金属酸化物を正極活物質として使用した。
下記表1のスペックを有するカーボンブラックを使用する以外は、前記実施例2と同一の方法でリチウム遷移金属酸化物の表面に凝集したカーボンブラックが吸着された形態の混合物を製造し、これを正極活物質として使用した。
下記表1のスペックを有するカーボンブラックを使用する以外は、前記実施例1と同一の方法でリチウム遷移金属酸化物の表面に凝集したカーボンブラックが吸着された形態の混合物を製造し、これを正極活物質として使用した。
下記表1のスペックを有するカーボンブラックを使用する以外は、比較例1と同一の方法でリチウム遷移金属酸化物上にリチウム遷移金属酸化物とカーボンブラックが均一に混合された混合物を製造し、これを正極活物質として使用した。
下記表1のスペックを有するカーボンブラックを使用する以外は、実施例1と同一の方法でリチウム遷移金属酸化物上に厚さ350nmの炭素コーティング層が形成された正極活物質を製造した。
(1)正極活物質の表面特性の確認
前記実施例1および比較例1、2、4、6の正極活物質の表面特性を確認し、これを図3~図6に示した。
実施例1~4および比較例1~6で製造した正極活物質5gをホルダーに入れてから30kNの力を加えて圧延した後、パウダー専用の四探針プローブ電極(三菱ケミカル、粉体抵抗システム(MCP=PD51)を用いて、前記正極活物質の粉体電気伝導度を測定し、これを下記表2に示した。
前記実施例1~4および比較例1~6の正極活物質の比表面積は、BET法によって測定したものであり、具体的には、BEL Japan社製のBELSORP-mini IIを用いて、液体窒素温度下(77K)での窒素ガス吸着量から算出し、表2に示した。
前記実施例1~4および比較例1~6で製造した正極活物質を用いてリチウム二次電池を製造し、実施例1~4および比較例1~6の正極活物質を含むリチウム二次電池それぞれに対して容量を評価した。
Claims (12)
- リチウム遷移金属酸化物と中空構造の炭素系物質を混合して混合物を形成するステップと、
前記混合物を機械的方式で処理し、前記リチウム遷移金属酸化物の表面に炭素コーティング層を形成するステップとを含み、
前記中空構造の炭素系物質は直鎖(chain)形状であり、比表面積が500m2/g以上であり、黒鉛化度(ID/IG)が1.0以上であり、DBP吸油量が300mL/100g以上である、正極活物質の製造方法。 - 前記リチウム遷移金属酸化物100重量部に対して、前記炭素系物質を0.1~1.5重量部混合する、請求項1に記載の正極活物質の製造方法。
- 前記混合物を機械的方式で処理することは、メカノフュージョン(mechanofusion)法によって行われる、請求項1または2に記載の正極活物質の製造方法。
- 前記炭素系物質は、一次粒子が凝集した二次粒子の形態である、請求項1から3のいずれか一項に記載の正極活物質の製造方法。
- 前記炭素系物質の一次粒子のサイズは50nm以下である、請求項4に記載の正極活物質の製造方法。
- 前記炭素系物質は、比表面積が500m2/g~2,500m2/gである、請求項1から5のいずれか一項に記載の正極活物質の製造方法。
- 前記炭素系物質は、黒鉛化度(ID/IG)が1.0~2.0である、請求項1から6のいずれか一項に記載の正極活物質の製造方法。
- 前記炭素系物質は、DBP吸油量が300mL/100g~2,000mL/100gである、請求項1から7のいずれか一項に記載の正極活物質の製造方法。
- リチウム遷移金属酸化物と、
前記リチウム遷移金属酸化物の表面に形成された炭素コーティング層とを含み、
前記炭素コーティング層は、前記リチウム遷移金属酸化物の表面に形成され、
前記炭素コーティング層の厚さは500nm以下であり、
BET比表面積が0.5m2/g~50m2/gである、正極活物質。 - 前記正極活物質は、0.1~20kNの力を加えて圧延した後に測定した粉体電気伝導度が3.7×10-3S/cm~10×10-3S/cmである、請求項9に記載の正極活物質。
- 請求項9または10に記載の正極活物質を含む、リチウム二次電池用正極。
- 請求項11に記載のリチウム二次電池用正極を含む、リチウム二次電池。
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WO2014038001A1 (ja) * | 2012-09-04 | 2014-03-13 | トヨタ自動車株式会社 | 非水電解質二次電池 |
KR101666871B1 (ko) | 2013-04-23 | 2016-10-24 | 삼성에스디아이 주식회사 | 양극 활물질 및 이의 제조 방법, 그리고 상기 양극 활물질을 포함하는 리튬 이차 전지 |
KR102214826B1 (ko) * | 2013-07-31 | 2021-02-10 | 삼성전자주식회사 | 복합 양극 활물질, 이를 포함하는 리튬 전지, 및 이의 제조방법 |
CN109716564B (zh) * | 2016-09-21 | 2022-09-09 | 巴斯夫户田电池材料有限公司 | 正极活性物质及其制造方法、以及非水电解质二次电池 |
KR20180071106A (ko) * | 2016-12-19 | 2018-06-27 | 울산과학기술원 | 표면개질된 양극 활물질, 양극 활물질의 표면개질 방법, 및 상기 표면개질된 양극 활물질을 포함하는 전기화학소자 |
KR102453272B1 (ko) * | 2018-04-06 | 2022-10-11 | 주식회사 엘지에너지솔루션 | 양극 활물질, 상기 양극 활물질의 제조 방법, 상기 양극 활물질을 포함하는 양극, 및 상기 양극을 포함하는 이차 전지 |
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2020
- 2020-01-30 KR KR1020200011338A patent/KR20210097528A/ko active Search and Examination
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2021
- 2021-01-29 JP JP2022541274A patent/JP2023511033A/ja active Pending
- 2021-01-29 EP EP21747957.5A patent/EP4064389A4/en active Pending
- 2021-01-29 WO PCT/KR2021/001212 patent/WO2021154029A1/ko unknown
- 2021-01-29 CN CN202180007427.2A patent/CN114846650A/zh active Pending
- 2021-01-29 US US17/788,897 patent/US20230074059A1/en active Pending
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CN114846650A (zh) | 2022-08-02 |
KR20210097528A (ko) | 2021-08-09 |
EP4064389A4 (en) | 2023-06-07 |
EP4064389A1 (en) | 2022-09-28 |
US20230074059A1 (en) | 2023-03-09 |
WO2021154029A1 (ko) | 2021-08-05 |
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