Lg Chem, Ltd

Lg Energy Solution, Ltd.

Seung Tae Hong

Sung Kyun Chang

Hong-Kyu Park

Youngsun Choi

Ho Seon Shin

Sinyoung Park

Eun Young Goh

Duk Hyun Ryu

Hyeong Jin Kim

Ho Chun Lee

Jun Yong Jeong

Hyung Keun Lee

Eung Je Lee

Jin Hee Yeon

Ki Tae Kim

Young Sun Choi

Mi Hyae Park

Yun Ho Roh

Je-Young Kim

Je Young Kim

Jae Hyun Lee

Soon Ho Ahn

Ho Suk Shin

Dong Sub Jung

Jong Mo Jung

Dong-Sub Jung

Jeong Min Kim

Hyo-Shik Kil

Hyo Shik Kil

Jong Hoa Ok

Sung Hyup Lee

Disclosed is a lithium secondary battery, which is low in capacity loss after overdischarge, having excellent capacity restorability after overdischarge and shows an effect of preventing a battery from swelling at a high temperature.

Cathode active material for lithium secondary battery

Provided is a cathode active material which is lithium transition metal oxide having an &#x3b1;-NaFeOlayered crystal structure, wherein the transition metal is a blend of Ni and Mn, an average oxidation number of the transition metals except lithium is more than +3, and lithium transition metal oxide satisfies the Equation m(Ni)&#x2267;m(Mn) (in which m (Ni) and m (Mn) represent an molar number of nickel and manganese, respectively). The lithium transition metal oxide has a uniform and stable layered structure through control of oxidation number of transition metals to a level higher than +3, thus advantageously exerting improved overall electrochemical properties including electric capacity, in particular, superior high-rate charge/discharge characteristics.

Provided is an electrode active material comprising a nickel-based lithium transition metal oxide (LiMO) wherein the nickel-based lithium transition metal oxide contains nickel (Ni) and at least one transition metal selected from the group consisting of manganese (Mn) and cobalt (Co), wherein the content of nickel is 50% or higher, based on the total weight of transition metals, and has a layered crystal structure and an average primary diameter of 3 &#x3bc;m or higher, wherein the amount of Nitaking the lithium site in the layered crystal structure is 5.0 atom % or less.

Electrode active material for lithium secondary battery

Disclosed is a cathode active material comprising a lithium-free metal oxide and a material with high irreversible capacity. A novel lithium ion battery system using the cathode active material is also disclosed. The battery, comprising a cathode using a mixture of a Li-free metal oxide and a material with high irreversible capacity, and an anode comprising carbon instead of Li metal, shows excellent safety compared to a conventional battery using lithium metal as an anode. Additionally, the novel battery system has a higher charge/discharge capacity compared to a battery using a conventional cathode active material such as lithium cobalt oxide, lithium nickel oxide or lithium manganese oxide.

System of lithium ion battery containing material with high irreversible capacity

Disclosed is an anode active material including: a crystalline phase comprising Si and a Si-metal alloy; and an amorphous phase comprising Si and a Si-metal alloy, wherein the metal of the Si-metal alloy of the crystalline phase is the same as or different from the metal of the Si-metal alloy of the amorphous phase.

Anode active material for secondary battery

Provided is a cathode active material which is lithium transition metal oxide having an &#x3b1;-NaFeOlayered crystal structure, wherein the transition metal is a blend of Ni and Mn, an average oxidation number of the transition metals except lithium is more than +3, and lithium transition metal oxide satisfies the Equation m(Ni)&#x2267;m(Mn) (in which m (Ni) and m (Mn) represent an molar number of manganese and nickel, respectively). The lithium transition metal oxide has a uniform and stable layered structure through control of oxidation number of transition metals to a level higher than +3, thus advantageously exerting improved overall electrochemical properties including electric capacity, in particular, superior high-rate charge/discharge characteristics.

Provided is a lithium transition metal oxide having an &#x3b1;-NaFeOlayered crystal structure, as a cathode active material for lithium secondary battery, wherein the transition metal includes a blend of Ni and Mn, an average oxidation number of the transition metals except lithium is more than +3, and the lithium transition metal oxide satisfies Equations 1 and 2 below:1.0&#x3c;(Ni)/(Mn)&#x2003;&#x2003;(1)(Ni)/(Mn)&#x3c;1&#x2003;&#x2003;(2) The cathode active material of the present invention has a uniform and stable layered structure through control of oxidation number of transition metals to a level higher than +3, in contrast to conventional cathode active materials, thus advantageously exerting improved overall electrochemical properties including electric capacity, in particular, superior high-rate charge/discharge characteristics.

Disclosed herein is a cathode active material for a lithium secondary battery, in particular, including a lithium transition metal oxide with a layered crystalline structure in which the transition metal includes a transition metal mixture of Ni, Mn and Co, and an average oxidation number of all transition metals other than lithium is more than +3, and specific conditions represented by the following formulae (1) and (2), 1.1&#x3c;m(Ni)/m(Mn)&#x3c;1.5 and 0.4&#x3c;m(Ni)/m(Mn)&#x3c;1, are satisfied. The inventive cathode active material has a more uniform and stable layered structure by controlling the oxidation number of transition metals contained in a transition metal oxide layer to form the layered structure, compared to conventional substances. Accordingly, the active material exhibits improved overall electrochemical characteristics including battery capacity and, in particular, excellent high rate charge-discharge features.

Provided is a transition metal precursor comprising a composite transition metal compound represented by Formula I, as a transition metal precursor used in the preparation of a lithium-transition metal composite oxide:M(OH)&#x2003;&#x2003;(1)wherein M is two or more selected from the group consisting of Ni, Co, Mn, Al, Cu, Fe, Mg, B, Cr and transition metals of period 2 in the Periodic Table of the Elements; and 0&#x3c;x&#x3c;0.5.

Precursor for the preparation of a lithium composite transition metal oxide

Provided is a precursor for the preparation of a lithium transition metal oxide that is used for the preparation of a lithium transition metal oxide as a cathode active material for a lithium secondary battery, through a reaction with a lithium-containing compound, wherein the precursor contains two or more transition metals, and sulfate ion (SO)-containing salt ions derived from a transition metal salt for the preparation of the precursor have a content of 0.1 to 0.7% by weight, based on the total weight of the precursor.

Growing community of inventors

Daejeon, South Korea

Seung Tae Hong