JP2020514954A - 正極活物質の製造方法及びこれを用いた正極活物質及びリチウム二次電池 - Google Patents
正極活物質の製造方法及びこれを用いた正極活物質及びリチウム二次電池 Download PDFInfo
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Abstract
Description
(a)金属−リン−酸化窒化物の前駆体を含むコーティング組成物を製造する段階;
(b)前記コーティング組成物を溶液工程によって正極活物質上に前駆体層を形成する段階;及び
(c)前記前駆体層が形成された正極活物質を熱処理して正極活物質上に金属−リン−酸化窒化物保護層を形成する段階を含む正極活物質の製造方法を提供する。
(a)金属−リン−酸化窒化物の前駆体を含むコーティング組成物を製造する段階;
(b)前記コーティング組成物を溶液工程によって正極活物質上に前駆体層を形成する段階;及び
(c)前記前駆体層が形成された正極活物質を熱処理して正極活物質上に金属−リン−酸化窒化物保護層を形成する段階を含む。
X1は、互いに同じでも異なってもよく、それぞれ独立的にOR1、F、Cl、BrまたはIで、この時、R1は、炭素数1ないし5のアルキル基である。)
R2及びR3は、互いに同じでも異なってもよく、それぞれ独立的に炭素数1ないし10のアルキル基または炭素数6ないし20のアリール基である。)
X2は、互いに同じでも異なってもよく、それぞれ独立的にR4、OR5、NR6R7、F、Cl、BrまたはIで、この時、R4ないしR7は、互いに同じでも異なってもよく、それぞれ独立的に炭素数1ないし10のアルキル基または炭素数6ないし20のアリール基であり、
nは、100ないし100,000の整数である。)。
リチウムとリンの原子比が2:1の前駆体を含むコーティング組成物を製造するために、0.0034Mヘキサクロロホスファゼンと0.0204Mリチウムヒドロキシドハイドレートを水と2−メトキシエタノール混合物(1:19(体積比))20mlに70℃で40分間加熱して溶かし、コーティング組成物を製造した。
リチウムとリンの原子比が2:1の前駆体を含むコーティング組成物を使って2nm厚さの保護層を形成したことを除いて、前記実施例1と同様の方法で正極活物質を製造した。
リチウムとリンの原子比が2:1の前駆体を含むコーティング組成物を使って1nm厚さの保護層を形成したことを除いて、前記実施例1と同様の方法で正極活物質を製造した。
保護層を形成しない平均粒径が15μmであるLiCoO2 10gを正極活物質として使用した。
前記実施例1及び比較例1で製造された正極活物質を走査電子顕微鏡(Scanning Electron Microscope、SEM)(モデル名:S−4800、HITACHI社)を利用して観察した。この時、得られた結果を下記図1及び2に示す。
前記実施例及び比較例で製造された正極活物質を利用して正極を製造した。
Claims (18)
- (a)金属−リン−酸化窒化物の前駆体を含むコーティング組成物を製造する段階;
(b)前記コーティング組成物を溶液工程によって正極活物質上に前駆体層を形成する段階;及び
(c)前記前駆体層が形成された正極活物質を熱処理して正極活物質上に金属−リン−酸化窒化物保護層を形成する段階を含む正極活物質の製造方法。 - 前記金属−リン−酸化窒化物の前駆体は、リン−窒素結合を含む化合物及び金属塩化合物の反応によって生成されるものである、請求項1に記載の正極活物質の製造方法。
- 前記リン−窒素結合を含む化合物は、下記化学式1ないし3で表される化合物の中で1種以上を含む、請求項2に記載の正極活物質の製造方法:
X1は、互いに同じでも異なってもよく、それぞれ独立的にOR1、F、Cl、BrまたはIで、この時、R1は、炭素数1ないし5のアルキル基である。)
R2及びR3は、互いに同じでも異なってもよく、それぞれ独立的に炭素数1ないし10のアルキル基または炭素数6ないし20のアリール基である。)
X2は、互いに同じでも異なってもよく、それぞれ独立的にR4、OR5、NR6R7、F、Cl、BrまたはIで、この時、R4ないしR7は、互いに同じでも異なってもよく、それぞれ独立的に炭素数1ないし10のアルキル基または炭素数6ないし20のアリール基であり、
nは、100ないし100,000の整数である。)。 - 前記金属塩化合物は、リチウム、ナトリウム、マグネシウム、カルシウム、亜鉛及びアルミニウムからなる群から選択される1種以上を含む、請求項2に記載の正極活物質の製造方法。
- 前記コーティング組成物は、リン−窒素結合を含む化合物、金属塩化合物及び有機溶媒を含む、請求項1に記載の正極活物質の製造方法。
- 前記コーティング組成物は、全体組成物100重量%を基準にして、
リン−窒素結合を含む化合物0.002ないし27重量%、
金属塩化合物0.0005ないし12重量%、及び
有機溶媒70ないし99.99重量%を含む、請求項5に記載の正極活物質の製造方法。 - 前記コーティング組成物は、カルコゲン化合物をさらに含む、請求項5に記載の正極活物質の製造方法。
- 前記正極活物質は、リチウム遷移金属酸化物を含む、請求項1に記載の正極活物質の製造方法。
- 前記正極活物質は、球状、楕円形、紡錘形、鱗片型、板状型、繊維型、棒型、コア−シェル型または非定型の形状である、請求項1に記載の正極活物質の製造方法。
- 前記(b)段階における溶液工程は、スプレーコーティング、スピンコーティング、ディップコーティング、インクジェットプリンティング、オフセットプリンティング、リバースオフセットプリンティング、グラビアプリンティング及びロールプリンティングの中で少なくともいずれか一つの方法を利用する、請求項1に記載の正極活物質の製造方法。
- 前記(c)段階において、熱処理は150℃以上500℃未満の温度範囲で行う、請求項1に記載の正極活物質の製造方法。
- 前記(c)段階の前に、前記(b)段階で形成された前駆体層に含まれた有機溶媒を取り除く段階をさらに含む、請求項1に記載の正極活物質の製造方法。
- 前記(c)段階で形成された金属−リン−酸化窒化物保護層は、非晶質の金属−リン−酸化窒化物、またはこの誘導体を含む、請求項1に記載の正極活物質の製造方法。
- 請求項1ないし請求項13のいずれか一項による方法で製造された正極活物質。
- 前記正極活物質は、正極活物質上の少なくとも一部に形成された金属−リン−酸化窒化物保護層を含む、請求項14に記載の正極活物質。
- 前記金属−リン−酸化窒化物保護層は、負極活物質全体100重量%を基準にして0.01ないし5重量%で含む、請求項15に記載の正極活物質。
- 前記金属−リン−酸化窒化物保護層の厚さは、1ないし1000nmである、請求項15に記載の正極活物質。
- 請求項14に記載の正極活物質を含むリチウム二次電池。
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US11444275B2 (en) | 2022-09-13 |
KR20190025501A (ko) | 2019-03-11 |
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