公开(公告)号：US20160285102A1

公开(公告)日：2016-09-29

申请号：US15076137

申请日：2016-03-21

Applicant: TDK CORPORATION

Inventor： Junpei SHITABA ,  Hideaki SEKI ,  Hiroyuki MIYABARA

IPC: H01M4/62 ,  H01M10/0525 ,  H01M4/136 ,  H01M4/505 ,  H01M4/525 ,  H01M4/131 ,  H01M4/36 ,  H01M4/58

CPC classification number: H01M4/625 ,  H01M4/131 ,  H01M4/136 ,  H01M4/366 ,  H01M4/505 ,  H01M4/525 ,  H01M4/5825 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/028

Abstract: A positive electrode active material for lithium ion secondary battery includes: active material particles including one or more compounds including Li and a transition metal; and a coating layer coating at least a part of a surface of the active material particles. The coating layer includes at least one of graphene or multilayer graphene The coating layer has a Raman spectrum with a G band (a peak of 1530 cm−1 to 1630 cm−1), a D band (a peak of 1300 cm−1 to 1400 cm−1), and a 2D band (a peak of 2650 cm−1 to 2750 cm−1). At least the intensity of the 2D band normalized by the intensity of the G band (2Dint/Gint) satisfies 0.05≦2Dint/Gint.

Abstract translation: 锂离子二次电池用正极活性物质包括：包含一种或多种包含Li和过渡金属的化合物的活性物质颗粒; 以及涂覆有活性物质颗粒表面的至少一部分的涂层。 涂层包括石墨烯或多层石墨烯中的至少一种。涂层具有具有G带（峰值为1530cm -1至1630cm -1）的拉曼光谱，D带（1300cm -1至 1400cm -1）和2D带（2650cm -1至2750cm -1的峰）。 至少由G带的强度（2Dint / Gint）归一化的2D频带的强度满足0.05≤D2int/ Gint。

公开(公告)号：US20150093633A1

公开(公告)日：2015-04-02

申请号：US14502314

申请日：2014-09-30

Applicant: TDK CORPORATION

Inventor： Hiroyuki MIYABARA ,  Hiroki KITAMURA ,  Yukiko HIRABAYASHI ,  Masaki SOBU ,  Tetsuo TAKAISHI

IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/131 ,  H01M4/62

CPC classification number: H01M4/366 ,  H01M4/131 ,  H01M4/525 ,  H01M4/625 ,  H01M10/0525 ,  Y02E60/122

Abstract: A lithium ion secondary battery with a high electrode density and an excellent rate discharge characteristic. The positive electrode includes a positive electrode active material of a compound represented by Lia(NixCoyAl1−x−y)O2 (0.95:≦a≦1.05, 0.5≦x≦0.9, 0.05≦y≦0.2), and carbon adhered to the surface of the material, in the Raman spectrum using a laser of 532 nm, the positive electrode includes a peak PA (D band) at 1200˜1450 cm−1, a peak PB (G band) at 1450˜1700 cm−1 and a peak PC at 400˜600 cm−1, and when the intensities are normalized by regarding the maximum intensity as 1 and the minimum intensity as 0 in the wavenumber domain of 200˜1800 cm−1, Raman intensity of the minimum (V band) between the two peaks of said peak PA and said peak PB is 0.6 or less, and Raman intensity of said peak PC is 0.1 or more and 0.5 or less.

Abstract translation: 具有高电极密度和优异的放电特性的锂离子二次电池。 该正极包括由LiI（NixCoyAl1-x-y）O 2（0.95：＆amp; NlE; a＆nlE; 1.05,0.5＆amp; nlE; x＆nlE; 0.9,0.05＆amp; nlE; y＆nlE; 0.2）表示的化合物的正极活性物质， 在使用532nm的激光的拉曼光谱中，在1200〜1450cm -1的峰值PA（D带），1450〜1700cm -1的峰值PB（G带） 1和400〜600cm -1的峰值PC，并且当在200〜1800cm -1的波数域中通过将最大强度为1和最小强度为0来对强度进行归一化时，最小的拉曼强度（ V波段）在所述峰值PA和所述峰值PB之间的两个峰值之间为0.6以下，所述峰值PC的拉曼强度为0.1以上且0.5以下。