Lg Energy Solution, Ltd.

Lg Chem, Ltd

Jun Hyuk Song

Eun Kyung Kim

Sang Wook Woo

Oh Byong Chae

Yoon Ah Kang

Ju Ho Chung

Joo Sung Lee

Je Young Kim

Ye Ri Kim

Suk In Noh

Yong Ju Lee

Sung Bin Park

Dong Sub Jung

Sangwook Woo

Hee Won Lee

Yeri Kim

Provided are a negative electrode for a lithium secondary battery having reinforced insulating properties, which comprises a negative electrode active material layer; and a ceramic separating layer formed on the negative electrode active material layer, wherein the negative electrode active material layer has an arithmetic average surface roughness (Ra) of 0.01 μm to 0.3 μm, and the ceramic separating layer has a thickness of 1 μm to 30 μm, and a lithium secondary battery comprising the same.

Negative electrode for lithium secondary battery and lithium secondary battery comprising the same

A method of recovering a used battery and apparatus for recovering the capacity of a secondary battery comprising: (1) preparing a secondary battery with deteriorated lifespan characteristics; (2) heating the secondary battery with deteriorated lifespan characteristics while pressing the secondary battery with deteriorated lifespan characteristics to compress a positive electrode, negative electrode, or separator included in the secondary battery; and (3) charging/discharging the secondary battery with deteriorated lifespan characteristics, the secondary battery having been pressed and heated, and the secondary battery with deteriorated lifespan characteristics may be charged and discharged while being pressed and heated, thereby exhibiting an effect of recovering the capacity of the secondary battery with deteriorated lifespan characteristics.

Method of recovering capacity of a used battery and a secondary battery capacity recovery apparatus

A method of preparing a negative electrode for a lithium secondary battery, which includes forming a negative electrode mixture layer including a negative electrode active material on a negative electrode current collector, disposing lithium metal powder on at least a part of the negative electrode mixture layer, pressing the negative electrode mixture layer on which the lithium metal powder is disposed, wetting the pressed negative electrode mixture layer with a first electrolyte solution, and drying the wet negative electrode mixture layer. A battery including the negative electrode of the present invention has enhanced rapid charge/discharge characteristics and enhanced lifespan characteristics.

Method of preparing negative electrode for lithium secondary battery

A negative electrode active material including a core including silicon, and a coating layer disposed on at least a portion of a surface of the core and including a coating material, wherein the coating material includes at least one selected from the group consisting of LiVOand MgH, wherein 0.5<a<1.5 and 0.5<b<1.5 is provided. Also, a negative electrode including the negative electrode active material and a lithium secondary battery including the negative electrode, are provided.

Negative electrode active material, negative electrode including negative electrode active material, and lithium secondary battery including negative electrode

A negative electrode for a lithium secondary battery and a lithium secondary battery including the negative electrode are disclosed. The negative electrode includes a negative electrode current collector, a first negative electrode active material layer present on the negative electrode current collector, and a second negative electrode active material layer present on the first negative electrode active material layer. The first negative electrode active material layer includes two or more kinds of first negative electrode active materials, and the second negative electrode active material layer includes a second negative electrode active material having swelling that is smaller than that of the first negative electrode active material layer. Therefore, the surface of the negative electrode does not exhibit deformation during pre-lithiation.

The present invention relates to a negative electrode for a secondary battery which comprises a negative electrode collector, a negative electrode active material layer formed on the negative electrode collector, and a lithium metal layer, wherein an adhesive layer is disposed between the negative electrode active material layer and the lithium metal layer, and the lithium metal layer comprises lithium and metal oxide in a weight ratio of 50:50 to 99:1.

Negative electrode for lithium secondary battery, lithium secondary battery comprising the same, and method of preparing the negative electrode

A method for pre-lithiating a silicon oxide negative electrode for a secondary battery, specifically a method for pre-lithiation by immersing the silicon oxide negative electrode in an electrolytic solution for wetting, and by applying pressure while a lithium metal is in direct contact with the wetted silicon oxide negative electrode. The silicon oxide negative electrode for a secondary battery manufactured through pre-lithiation provided in the present disclosure has improved initial irreversibility, and a secondary battery manufactured using such a silicon oxide negative electrode for a secondary battery has excellent charge/discharge efficiency.

Pre-lithiation method of silicon oxide anode electrodes for secondary battery

A lithium secondary battery, wherein there is a pre-lithiated negative electrode such that a total irreversible capacity of a positive electrode is greater than a total irreversible capacity of the negative electrode while satisfying 150&#x3c; (negative electrode discharge capacity/lithium secondary battery discharge capacity)&#xd7;100&#x3c;300, and a relative potential of the negative electrode with respect to lithium metal in an operating voltage range of the lithium secondary battery is in a range of &#x2212;0.1 V to 0.7 V. Such a lithium secondary battery is capable of maintaining a capacity retention of 60% or more even after 500 cycles or more while achieving an energy density per volume of 800 Wh/L or more.

Long-life and ultra-high energy density lithium secondary battery

A negative electrode for a lithium secondary battery, which includes a negative electrode active material layer formed on a negative electrode collector, and a coating layer formed on the negative electrode active material layer and which includes lithium metal and metal oxide, a lithium secondary battery including the same, and a method of preparing the negative electrode.

A lithium secondary battery including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, wherein the negative electrode is lithiated by pre-lithiation, a total capacity of a negative electrode active material of the negative electrode is larger than a total capacity of a positive electrode active material of the positive electrode, and a charge capacity of the negative electrode is smaller than a charge capacity of the positive electrode by the pre-lithiation.

Lithium secondary battery and method for preparing the same

A pre-lithiation apparatus that pre-lithiates a negative electrode structure having a first surface on which a negative electrode is disposed to produce a negative electrode unit of a battery, the apparatus includes a first roll rotatable to wind or unwind the negative electrode structure before the pre-lithiation is performed, a second roll installed to be spaced apart from the first roll and rotatable to wind and collect the negative electrode structure, on which the pre-lithiation is performed, and a lithium roll crossing a direction in which the negative electrode structure is transferred from the first roll to the second roll to come into contact with at least one of a first surface and a second surface of the negative electrode structure while being transferred from the first roll to the second roll. The lithium roll includes a lithium foil and an elastic member.

Pre-lithiation apparatus, method of producing negative electrode unit and negative electrode unit

TA negative electrode, a secondary battery including the same, and a method of preparing the negative electrode are provided. The negative electrode, which includes a current collector; a negative electrode active material layer disposed on the current collector; a first layer disposed on the negative electrode active material layer and including Li; and a second layer disposed on the first layer and including an inorganic material is provided. A loading amount of the first layer may satisfy Equation 1:0.65&#xd7;()&#x3c;loading amount of the first layer&#x3c;0.95&#xd7;().&#x2003;&#x2003;[Equation 1]

Negative electrode, secondary battery including the same, and method of preparing the negative electrode

A method for pre-lithiation of a negative electrode and a negative electrode formed by the method, the method including forming a mixture of inorganic material powder and molten lithium, forming a lithium metal-inorganic material composite ribbon, rolling the ribbon into a film and bonding the lithium metal-inorganic material composite film on a surface of a negative electrode to form a lithium metal-inorganic material composite layer on the surface of the negative electrode. This method reduces the deterioration of lithium during application of a mixture slurry and a negative electrode for a secondary battery, manufactured by the method for pre-lithiation, has improved initial irreversibility, and a secondary battery manufactured using such a negative electrode has excellent charging and discharging efficiency.

Method for forming lithium metal and inorganic material composite thin film and method for pre-lithiation of negative electrode for lithium secondary battery by using same

A method of pre-lithiating a negative electrode for a secondary battery, including: dispersing a lithium metal powder, an inorganic material powder and a binder in a solvent to prepare a mixed solution; and applying the mixed solution to the negative electrode to form a lithium metal-inorganic composite layer on the negative electrode, thereby forming the pre-lithiated negative electrode. Also, a method for pre-lithiating a negative electrode having a high capacity by a simple process. Further, a negative electrode for a secondary battery manufactured through the pre-lithiation method provided in the present invention has an improved initial irreversibility, and secondary batteries manufactured using such a negative electrode for a secondary battery have excellent charge/discharge efficiency.

Pre-lithiation using lithium metal and inorganic composite layer

The present disclosure relates to a device and method for controlling discharge by calculating a slope of a discharge profile of a battery having a lithium-based cathode material and a silicon-based anode cell material, counting a frequency the slope is equal to or smaller than a preset slope value and adjusting a final discharge voltage in response to the counted frequency being above a predetermined frequency.

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Daejeon, South Korea

Jun Hyuk Song