Lg Chem, Ltd

Lg Energy Solution, Ltd.

Ju Kyung Shin

Wang Mo Jung

Byung Chun Park

Sang Min Park

Sang Wook Lee

Ji Hoon Ryu

Seong Hoon Kang

Ji Hye Kim

Joon Sung Bae

Min Suk Kang

Tae Gu Yoo

So Ra Baek

Young Cheol Choi

Joo Hong Jin

Gyu Ok Hwang

In Young Cha

In Seong Ju

In one embodiment, a positive electrode active material for a secondary battery, the positive electrode active material being a primary particle having a monolithic structure that includes a lithium composite metal oxide of Formula 1 below, wherein the primary particle has an average particle size (D) of 2 &#x3bc;m to 20 &#x3bc;m and a Brunauer-Emmett-Teller (BET) specific surface area of 0.15 m/g to 0.5 m/g, and wherein the positive electrode active material has a rolling density of 3.0 g/cc or higher under a pressure of 2 ton&#xb7;f:LiNiCoM1M3M2O&#x2003;&#x2003;[Formula 1]

Positive electrode active material for secondary battery, and secondary battery comprising the same

A jig for pressing a gas analysis monocell according to the present invention comprises: a first plate and a second plate which face each other with a monocell therebetween; a first auxiliary pad positioned between the first plate and the monocell; and a second auxiliary pad positioned between the second plate and the monocell, wherein the first plate and the second plate are formed of a thermosetting resin. When analyzing a gas generated from the monocell during a primary charge, the jig for pressing the monocell according to the present invention presses the thin monocell to prevent a gap from forming between electrodes due to the primary charge, and thus has an effect of deriving more reliable analysis results.

Jig for pressing gas analysis monocell, and gas analysis device including same

The present invention provides a positive electrode active material for a secondary battery which includes a lithium transition metal oxide, wherein the positive electrode active material has three peaks in a differential graph (ERC curve) obtained by differentiating a pH value against an amount of acid (HCl) added, which is obtained by pH titration of 10 g of the lithium transition metal oxide using 0.5 M HCl, wherein a y-axis (dpH/dml) value of a first peak at the smallest x-axis value among the three peaks is &#x2212;1.0 or less.

Positive electrode active material for secondary battery and lithium secondary battery including the same

The present invention provides a positive electrode active material for a secondary battery, the positive electrode active material being a primary particle having a monolithic structure that includes a lithium composite metal oxide of Formula 1 below, wherein the primary particle has an average particle size (D) of 2 &#x3bc;m to 20 &#x3bc;m and a Brunauer-Emmett-Teller (BET) specific surface area of 0.15 m/g to 1.9 m/g, and a secondary battery including the same.

A method for positive electrode active material for a secondary battery includes preparing a precursor by reacting a nickel raw material, a cobalt raw material and an M1 raw material; forming a first surface-treated layer including an oxide of Formula 2 below, on a surface of a core including a lithium composite metal oxide of Formula 1 below, by mixing the precursor with a lithium raw material and an M3 raw material, firing the resultant mixture; and forming a second surface-treated layer including a lithium compound of Formula 3 below, on the core with the first surface-treated layer formed thereon,LiNiCoM1M3M2O&#x2003;&#x2003;[Formula 1]LiM4O&#x2003;&#x2003;[Formula 2]LiM5A&#x2003;&#x2003;[Formula 3]wherein, in Formulae 1 to 3, A, M1 to M5, a, x, y, z, w, m, n, p, and q are the same as those defined in the specification.

Positive electrode active material for secondary battery, and secondary battery including the same

The present invention provides a positive electrode active material for a secondary battery, the positive electrode active material being a secondary particle that includes a primary particle having a rectangular parallelepiped shape, the rectangular parallelepiped having at least one portion of vertices and edges formed in a round shape that is convex outward, wherein 1% to 40% of a total surface area of the secondary particle has open porosity, and the primary particle includes a lithium composite metal oxide of Formula 1 herein so that intercalation and deintercalation of lithium are facilitated, elution of an active material-constituting metal element is suppressed, and excellent structural stability is exhibited, thereby decreasing resistance and improving output and lifespan characteristics when applied to a battery, and a secondary battery comprising the same.

Positive electrode active materials for secondary battery and secondary battery comprising the same

The present invention relates to a positive electrode active material for a secondary battery and a secondary battery including the same, wherein the positive electrode active material includes a core, a shell disposed to surround the core, and a buffer layer which is disposed between the core and the shell and includes pores and a three-dimensional network structure connecting the core and the shell, wherein the core, the shell, and the three-dimensional network structure of the buffer layer each independently includes a polycrystalline lithium composite metal oxide of Formula 1 including a plurality of grains, and the grains have an average grain diameter of 50 nm to 150 nm.

Positive electrode active material for secondary battery and secondary battery including the same

The present invention provides a method of preparing a positive electrode active material for a secondary battery including preparing a first transition metal-containing solution including a nickel raw material, a cobalt raw material, and a manganese raw material and a second transition metal-containing solution including a nickel raw material, a cobalt raw material, and a manganese raw material in a concentration different from that of the first transition metal-containing solution; preparing a reaction solution, in which nickel manganese cobalt-based composite metal hydroxide particles are formed, by adding an ammonium cation-containing complexing agent and a basic compound as well as the second transition metal-containing solution to the first transition metal-containing solution and performing a co-precipitation reaction in a pH range of 11 to 13.

Positive electrode active material for secondary battery, method of preparing the same, and secondary battery including the positive electrode active material

Provided are a positive electrode active material for a secondary battery which may exhibit excellent capacity and life characteristics when used in the battery by including a core, and a surface treatment layer disposed on a surface of the core, wherein the core is a secondary particle including a plurality of primary particles, the primary particles include a polycrystalline lithium composite metal oxide of Formula 1 having an average grain diameter of 50 nm to 200 nm, and the surface treatment layer includes a lithium oxide including lithium and at least one metal selected from the group consisting of boron (B), tungsten (W), hafnium (Hf), niobium (Nb), tantalum (Ta), molybdenum (Mo), silicon (Si), tin (Sn), and zirconium (Zr), and a secondary battery including the same,LiNiCoM1M3M2O&#x2003;&#x2003;[Formula 1] (in Formula 1, M1, M2, M3, a, x, y, z, and w are the same as those defined in the specification).

The present invention provides a positive electrode active material for a secondary battery, the positive electrode active material including a lithium composite metal oxide particle represented by Formula 1 below, and a secondary battery including the same.LiNiCoM1M2M3O&#x2003;&#x2003;[Formula 1] In Formula 1, M1 is a metal element whose surface energy (&#x394;E) calculated by Equation 1 below is &#x2212;0.5 eV or higher, M2 is a metal element whose surface energy (&#x394;E) calculated by Equation 1 below is &#x2212;1.5 eV or higher and less than &#x2212;0.5 eV, M3 is a metal element whose surface energy (&#x394;E) calculated by Equation 1 below is less than &#x2212;1.5 eV, and 1.0&#x2264;a&#x2264;1.5, 0&#x3c;x&#x2264;0.5, 0&#x3c;z&#x2264;0.05, 0.002&#x2264;w&#x2264;0.1, 0&#x3c;x+y&#x2264;0.7.  In Equation 1 above, Erepresents an extent to which a metal element is oriented toward the outermost surface of the lithium composite metal oxide particle, Erepresents an extent to which the metal element is oriented toward a central portion of the lithium composite metal oxide particle, Eis energy of a slab model of the lithium composite metal oxide particle when the metal element is at the central portion of the lithium composite metal oxide particle, Eis energy of a slab model of the lithium composite metal oxide when the metal element is at the outermost surface of the lithium composite metal oxide, and Eis energy of a bulk model corresponding to each of the slab models.

The present invention provides a positive electrode active material for a secondary battery and a secondary battery including the same, which includes a core; a shell located to surround the core; and a buffer layer located between the core and the shell, and including a three-dimensional network structure connecting the core and the shell and a pore. The decomposition of the active material may be minimized by a rolling process in the manufacture of an electrode by controlling the specific surface area, average particle diameter and porosity of the active material particles as well as the specific structure, the reactivity with an electrolyte solution may be maximized, and the output and lifespan characteristics of the secondary battery may be improved since the particles forming the shell have crystal structure with orientation which facilitates intercalation and deintercalation of lithium ions.

Positive electrode active material for secondary battery, method of preparing the same and secondary battery including the same

The present invention provides a positive electrode active material for secondary battery and a secondary battery including the same. The positive electrode active material includes a core including a lithium composite metal oxide of Formula 1 below, a first surface-treated layer positioned on the surface of the core and including a lithium oxide of Formula 2 below, and a second surface treated layer positioned on the core or the first surface-treated layer and including a lithium compound of Formula 3. Thus, the present invention can improve capacity characteristics and output characteristics of a battery and also reduce the generation of gas,LiNiCoM1M3M2O&#x2003;&#x2003;[Formula 1]LiM4O&#x2003;&#x2003;[Formula 2]LiM5A&#x2003;&#x2003;[Formula 3] (in formulae 1 to 3, A, M1 to M5, a, x, y, z, w, m, n, p, and q are the same as those defined in the specification).

The present invention provides a positive electrode active material for a secondary battery, which includes a core, a shell disposed to surround the core, and a buffer layer which is disposed between the core and the shell and includes pores and a three-dimensional network structure connecting the core and the shell, wherein, the core, the shell, and the three-dimensional network structure of the buffer layer each independently include a lithium nickel manganese cobalt-based composite metal oxide and at least one metallic element of the nickel, the manganese, and the cobalt has a concentration gradient that gradually changes in any one region of the core, the shell, and the entire positive electrode active material.

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Daejeon, South Korea

Ju Kyung Shin