Lg Energy Solution, Ltd.

Lg Chem, Ltd

Suk In Noh

Jun Hyuk Song

Eun Kyung Kim

Sang Wook Woo

Joo Sung Lee

Yong Ju Lee

Je Young Kim

Ju Ho Chung

Dong Sub Jung

Chang Ju Lee

Hee Won Lee

A method for preparing a graphene nanosheet, wherein the method includes preparing an electrode assembly comprising a negative electrode, wherein the negative electrode comprises artificial graphite, a lithium metal counter electrode opposing the negative electrode, and a separator interposed between the negative electrode and the lithium metal counter electrode, and immersing the electrode assembly in an electrolyte, electrochemically charging the immersed electrode assembly to form a charged electrode assembly, separating the artificial graphite from the charged electrode assembly to form separated artificial graphite, and de-laminating a graphene nanosheet from the separated artificial graphite, wherein the initial discharge capacity of the negative electrode is 350 mAh/g or greater, and the electrolyte comprises an organic solvent comprising a cyclic carbonate and a linear carbonate, and a lithium salt.

Method for preparing graphene nanosheet

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 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

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.

Device and method for controlling discharge based on slope of the discharge profile

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Daejeon, South Korea

Suk In Noh