公开(公告)号：US20190089003A1

公开(公告)日：2019-03-21

申请号：US16082458

申请日：2017-03-03

Applicant: NEC Corporation

Inventor： Takehiro NOGUCHI ,  Shin SERIZAWA ,  Takuya HASEGAWA

IPC: H01M10/0569 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/525 ,  H01M10/058

CPC classification number: H01M10/0569 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M10/058 ,  H01M2004/021 ,  H01M2220/20 ,  H01M2300/0034 ,  H01M2300/0037 ,  Y02E60/122 ,  Y02T10/7011

Abstract: The purpose of the present invention is to provide a lithium secondary battery which has improved service life characteristics by suppressing a decomposition reaction of the electrolyte solution in the field of batteries that operate at high voltages or are assumed to be used at high temperatures for a long period of time. The present invention relates to an electrolyte solution for a secondary, which is characterized by containing a sulfone compound, a fluorine-containing cyclic acetal compound and a cyclic carbonate in a specific composition; and a secondary battery which uses this electrolyte solution for a secondary battery.

公开(公告)号：US20190027786A1

公开(公告)日：2019-01-24

申请号：US16070046

申请日：2017-01-12

Applicant: NEC Corporation

Inventor： Takehiro NOGUCHI ,  Takuya HASEGAWA ,  Shin SERIZAWA

IPC: H01M10/0569 ,  H01M10/0525 ,  H01M10/0567 ,  H01M4/505 ,  H01M4/525 ,  H01M4/58

Abstract: The purpose of the present embodiment is to provide a lithium secondary battery which is assumed to be operated at a high voltage or to be used at high temperatures for a long period of time, and which has improved life characteristics by suppressing a decomposition reaction of the electrolyte solution. The present embodiment relates to an electrolyte solution for a secondary battery containing a sulfone compound, a fluorine containing ether and an acid anhydride at a specific composition, and a secondary battery which uses this electrolyte solution for a secondary battery.

公开(公告)号：US20160308199A1

公开(公告)日：2016-10-20

申请号：US15101792

申请日：2014-11-05

Applicant: NEC Corporation

Inventor： Takehiro NOGUCHI ,  Makiko TAKAHASHI ,  Shin SERIZAWA

IPC: H01M4/36 ,  H01M4/525 ,  H01M4/50 ,  C01G53/00 ,  H01M4/131 ,  H01M10/0525 ,  H01M4/04 ,  H01M4/505 ,  H01M4/52

CPC classification number: H01M4/366 ,  C01G45/1242 ,  C01G53/54 ,  C01P2002/76 ,  C01P2002/85 ,  C01P2004/84 ,  C01P2006/40 ,  H01M4/0471 ,  H01M4/131 ,  H01M4/502 ,  H01M4/505 ,  H01M4/523 ,  H01M4/525 ,  H01M10/0525

Abstract: A secondary battery having an improved life characteristics is provided by the use of a positive electrode active material for a secondary battery, comprising (a) a surface layer comprising a lithium metal composite oxide having a spinel crystal structure represented by space group Fd-3m, and (b) an internal portion comprising a lithium metal composite oxide having a spinel crystal structure represented by space group P4332.

Abstract translation: 通过使用二次电池用正极活性物质，提供具有改善的寿命特性的二次电池，其包括（a）包含具有由空间群Fd-3m表示的尖晶石晶体结构的锂金属复合氧化物的表面层， 和（b）包含具有由空间群P4332表示的尖晶石晶体结构的锂金属复合氧化物的内部部分。

公开(公告)号：US20160285091A1

公开(公告)日：2016-09-29

申请号：US14442141

申请日：2013-10-28

Applicant: NEC CORPORATION

Inventor： Jiro IRIYAMA ,  Daisuke KAWASAKI ,  Emiko FUJII ,  Shin SERIZAWA ,  Hiroo TAKAHASHI

IPC: H01M4/485 ,  H01M4/04 ,  H01M10/0525

CPC classification number: H01M4/485 ,  H01M4/0445 ,  H01M4/0459 ,  H01M4/1391 ,  H01M10/0525 ,  H01M2004/027

Abstract: A negative electrode active material comprising silicon oxide satisfying the following Equation 1 and Equation 2 when solid state NMR (29Si-DDMAS) of silicon is measured for the silicon oxide after performing charging at least once is excellent in the performance as a negative electrode active material for a lithium secondary battery; 0.42≦S1/(S1+S2+S3)≦0.55  (Equation 1) 0.21≦S3/(S1+S2+S3)≦0.26,  (Equation 2) in which S1 is a sum of peak areas of a group of signals assigned to Si having a Si—Si bond and having peaks at 0 to −15 ppm, −55 ppm, −84 ppm and −88 ppm, S2 is a sum of peak areas of a group of signals assigned to Si having a Si(OH)4-n(OSi)n (n=3, 4) structure and having peaks at −100 ppm and −120 ppm, and S3 is a sum of peak areas of a group of signals assigned to Si having a Si(OLi)4-n(OSi)n (n=0, 1, 2, 3) structure and having peaks at −66 ppm, −74 ppm, −85 ppm and −96 ppm.

Abstract translation: 其中S1是分配给具有Si-Si键的Si并且在0至-15ppm，-55ppm，-84ppm和-88ppm具有峰值的一组信号的峰值面积之和，S2是 分配给具有Si（OH）4-n（OSi）n（n = 3,4）结构并在-100ppm和-120ppm具有峰值的Si的一组信号的峰值面积，S3是峰值 分配给具有Si（OLi）4-n（OSi）n（n = 0,1,2,3）结构并具有在-66ppm，-74ppm，-85ppm的峰和 -96ppm。