Top > Search of International Patents > POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE AND SECONDARY BATTERY USING SUCH POSITIVE ELECTRODE ACTIVE MATERIAL, AND POSITIVE ELECTRODE ACTIVE MATERIAL MANUFACTURING METHOD

POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE AND SECONDARY BATTERY USING SUCH POSITIVE ELECTRODE ACTIVE MATERIAL, AND POSITIVE ELECTRODE ACTIVE MATERIAL MANUFACTURING METHOD NEW_EN commons

Foreign code F190009991
File No. (N17075)
Posted date Oct 30, 2019
Country WIPO
International application number 2019JP014114
International publication number WO 2019189801
Date of international filing Mar 29, 2019
Date of international publication Oct 3, 2019
Priority data
  • P2018-066115 (Mar 29, 2018) JP
Title POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE AND SECONDARY BATTERY USING SUCH POSITIVE ELECTRODE ACTIVE MATERIAL, AND POSITIVE ELECTRODE ACTIVE MATERIAL MANUFACTURING METHOD NEW_EN commons
Abstract Provided is a positive electrode active material with which a battery displaying favorable cycle characteristics can be obtained. The positive electrode active material comprises lithium cobalt oxide single-crystal particles having a barrel shape that includes a {100} surface and a {104} surface. The particles have a median diameter D50 of 0.5-3.0μm, and the standard deviation of the particle diameter is 0.10-0.20.
Outline of related art and contending technology BACKGROUND ART
In recent years, secondary batteries, a personal computer, video camera, and as a power source such as a mobile phone, or vehicle as a power source for power storage, and must have been an important component.
In particular of the secondary battery is a lithium ion secondary battery, other than the secondary battery of high energy density, high-voltage operation can be seen that feature. Therefore, the size and weight as a secondary battery can be easily used in a communication device associated with the information and, in recent years, as a low pollution vehicle for electric cars and hybrid cars, electric tool, such as a high-output and high capacity for monolayer of lithium ion secondary battery has been developed.
In the lithium ion secondary battery, cycle characteristics and battery life is an important property, in order to improve the cycle characteristics of the lithium ion secondary battery has been studied. In the lithium ion secondary battery, usually, the positive electrode active material during charge and discharge of lithium ions in and out of the order, the positive electrode active material due to the deterioration of the cycle characteristic is deteriorated. Therefore, in order to obtain good charge-discharge capacity of the positive electrode active material has been studied.
Conventional, generally lithium cobalt oxide is used, a solid-phase reaction is obtained, as shown in Fig. 1 the shape of the plate-like particles, plate-like particles or amorphous particles or granulated shape of the stack.
In addition, in Non-Patent Document 1, {001} surface has been developed, {104} plane, {101} plane, {102} surface and has a shape of a hexagonal barrel shape LiCoO 2 has been proposed a positive electrode active material, it is compared to the lithium ion secondary battery and good charge-discharge capacity can be made.
Scope of claims (In Japanese)[請求項1]
 {100}面及び{104}面を含む樽型形状のコバルト酸リチウム単結晶粒子であって、0.5~3.0μmのメジアン径D50を有し、粒径の標準偏差が0.10~0.20である、正極活物質。

[請求項2]
 {100}面及び{104}面を含む樽型形状のコバルト酸リチウム単結晶粒子であって、1.5~5.0m 2/gの比表面積を有する、正極活物質。

[請求項3]
 {100}面及び{104}面を含む樽型形状のコバルト酸リチウム単結晶粒子であって、粉末X線回折で測定される104回折線の強度に対する003回折線の強度の比率が1.5~2.2である、正極活物質。

[請求項4]
 {100}面及び{104}面を含む樽型形状のコバルト酸リチウム単結晶粒子であって、(i)~(iii)のうち少なくとも2つを備える正極活物質:
 (i)0.5~3.0μmのメジアン径D50を有し、粒径の標準偏差が0.10~0.20である;
 (ii)1.5~5.0m 2/gの比表面積を有する;及び
 (iii)粉末X線回折で測定される104回折線の強度に対する003回折線の強度の比率が1.5~2.2である。

[請求項5]
 大気中光電子分光装置で測定されるイオン化ポテンシャルが5.50~5.80eVである、請求項4に記載の正極活物質。

[請求項6]
 請求項1~5のいずれか一項に記載の正極活物質を含む二次電池用の正極。

[請求項7]
 請求項6に記載の正極を含む二次電池。

[請求項8]
 原料として、D50が0.3~1.0μmの酸化コバルト粉末と、リチウム源の粉末とを準備すること、
 フラックスとして塩化ナトリウム粉末を準備すること、
 前記酸化コバルト粉末、前記リチウム源の粉末、及び前記塩化ナトリウム粉末を混合して、混合物を得ること、
 前記混合物を、800~1000℃で熱処理し、100~300℃/hの降温速度で500℃以下まで冷却して、コバルト酸リチウム単結晶を含む反応物を得ること、並びに
 前記反応物から前記塩化ナトリウムを溶解除去して、正極活物質であるコバルト酸リチウム単結晶を単離すること、
 を含む、正極活物質の製造方法。

[請求項9]
 前記リチウム源が、水酸化リチウム、炭酸リチウム、及び塩化リチウムのうちの少なくとも1種である、請求項8に記載の正極活物質の製造方法。

[請求項10]
 前記単離したコバルト酸リチウム単結晶を、600~800℃で熱処理することを含む、請求項8または9に記載の正極活物質の製造方法。
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • SHINSHU UNIVERSITY
  • Inventor
  • TESHIMA Katsuya
  • ZETTSU Nobuyuki
  • YAMADA Tetsuya
  • KANEKO Akihito
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
Please contact us by E-mail or facsimile if you have any interests on this patent.

PAGE TOP

close
close
close
close
close
close