JP2022540695A - リチウム金属負極の製造方法、これによって製造されたリチウム金属負極及びこれを含むリチウム‐硫黄電池 - Google Patents
リチウム金属負極の製造方法、これによって製造されたリチウム金属負極及びこれを含むリチウム‐硫黄電池 Download PDFInfo
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- JP2022540695A JP2022540695A JP2022502963A JP2022502963A JP2022540695A JP 2022540695 A JP2022540695 A JP 2022540695A JP 2022502963 A JP2022502963 A JP 2022502963A JP 2022502963 A JP2022502963 A JP 2022502963A JP 2022540695 A JP2022540695 A JP 2022540695A
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- Prior art keywords
- lithium
- lithium metal
- negative electrode
- sulfur
- powder
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- H01M10/05—Accumulators with non-aqueous electrolyte
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Abstract
Description
(a)窒化リチウム粉末をリチウム金属を含むリチウム金属層の少なくとも一面上に塗布する段階;及び
(b)上記塗布された粉末を圧延して上記リチウム金属を含むリチウム金属層の少なくとも一面上に粉末床の窒化リチウム保護層を形成する段階を含むリチウム金属負極の製造方法を提供する。
(a)窒化リチウム粉末をリチウム金属を含むリチウム金属層の少なくとも一面上に塗布する段階;及び
(b)上記塗布された粉末を圧延して上記リチウム金属を含むリチウム金属層の少なくとも一面上に粉末床の窒化リチウム保護層を形成する段階を含む。
[実施例1]
窒化リチウム(シグマアルドリッチ(Sigma‐Aldrich Co.)製品)を粉砕して平均粒径が1μmの窒化リチウム粉末を製造した。
正極活物質で硫黄‐炭素複合体(S:C=75:25(重量比))87.5重量%、導電材でデンカブラック5.0重量%、バインダーでスチレンブタジエンゴム/カルボキシメチルセルロース(SBR:CMC=70:30(重量比))7.5重量%を混合して正極スラリー組成物を製造した。
窒化リチウム保護層をコーティングしていない45μm厚さのリチウム金属薄膜でリチウム金属負極を製造した。
実施例1のリチウム金属負極の代わりに比較例1のリチウム金属負極を使ったことを除いては、上記実施例2と同様に行ってリチウム‐硫黄電池を製造した。
45μm厚さのリチウム金属薄膜を準備した。
実施例1のリチウム金属負極の代わりに比較例3のリチウム金属負極を使用したことを除いては、上記実施例2と同様に行ってリチウム‐硫黄電池を製造した。
実施例1及び比較に1で製造したリチウム金属負極の表面を肉眼で評価した。この時得られた結果は図1に示す。
実施例2、比較例2及び比較例4で製造した電池に対して、充・放電測定装置(LAND CT‐2001A、武漢(Wuhan)社製品)を使って性能を評価した。
Claims (18)
- (a)リチウム金属を含むリチウム金属層の少なくとも一面上に窒化リチウム粉末を塗布する工程;及び
(b)上記塗布された粉末を圧延して上記リチウム金属を含むリチウム金属層の少なくとも一面上に粉末床の窒化リチウム保護層を形成する工程を含むリチウム金属負極の製造方法。 - 上記窒化リチウム粉末は平均粒径(D50)が0.1μmないし100μmである、請求項1に記載のリチウム金属負極の製造方法。
- 上記塗布工程は撒布を通じて行う、請求項1に記載のリチウム金属負極の製造方法。
- 上記圧延工程は窒化リチウム粉末が塗布されたリチウム金属層を圧延板の間に位置させて熱または圧力を印加した後、圧延板を取り除く方法で行うことである、請求項1~3のいずれか一項に記載のリチウム金属負極の製造方法。
- 上記圧延板は高分子フィルムまたは板金である、請求項4に記載のリチウム金属負極の製造方法。
- 上記圧延工程は常温(25℃)ないし120℃の温度条件下で行う、請求項1に記載のリチウム金属負極の製造方法。
- 上記圧延工程は0.1kNないし980kNの圧力条件下で行う、請求項1に記載のリチウム金属負極の製造方法。
- 上記リチウム金属層はリチウム金属薄膜を含む、請求項1に記載のリチウム金属負極の製造方法。
- 上記リチウム金属負極はリチウム‐硫黄電池用で使われる、請求項1に記載のリチウム金属負極の製造方法。
- リチウム金属を含むリチウム金属層;及び
上記リチウム金属層の少なくとも一面上に窒化リチウム粉末を圧延してバインダーを使わずに固定させた粉末床の窒化リチウム保護層を含むリチウム金属負極。 - 上記リチウム金属層はリチウム金属薄膜を含む、請求項10に記載のリチウム金属負極。
- 上記リチウム金属負極はリチウム‐硫黄電池用で使われる、請求項10に記載のリチウム金属負極。
- 上記粉末床の窒化リチウム保護層は厚さが0.1μmないし100μmである、請求項10に記載のリチウム金属負極。
- 上記リチウム金属負極は表面抵抗が10Ωないし500Ωである、請求項10に記載のリチウム金属負極。
- 上記粉末床の窒化リチウム保護層のリチウムイオン伝導度は0.0001S/cmないし0.005S/cmである、請求項10に記載のリチウム金属負極。
- 正極活物質を含む正極;
請求項10に記載のリチウム金属負極;及び
電解質を含むリチウム‐硫黄電池。 - 上記正極活物質は硫黄元素及び硫黄化合物からなる群から選択される1種以上を含む、請求項16に記載のリチウム‐硫黄電池。
- 上記正極活物質は無機硫黄、Li2Sn(n≧1)、ジスルフィド化合物、有機硫黄化合物及び炭素‐硫黄ポリマー((C2Sx)n、x=2.5ないし50、n≧2)からなる群から選択される1種以上を含む、請求項16に記載のリチウム‐硫黄電池。
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