Porous anode active material, method of preparing the same, and anode and lithium battery employing the same
First Claim
1. A porous anode active material comprising:
- fine particles of metallic substance capable of forming a lithium alloy;
a crystalline carboneous substance; and
a porous carboneous material coating and binding the fine particles of metallic substance and the crystalline carboneous substance,the porous anode active material having pores exhibiting a bimodal size distribution with two pore diameter peaks in a Barrett-Joyner-Halenda (BJH) pore size distribution as measured by a nitrogen adsorption test.
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Accused Products
Abstract
Provided are a porous anode active material, a method of preparing the same, and an anode and a lithium battery employing the same. The porous anode active material includes fine particles of metallic substance capable of forming a lithium alloy; a crystalline carboneous substance; and a porous carboneous material coating and attaching to the fine particles of metallic substance and the crystalline carboneous substance, the porous anode active material having pores exhibiting a bimodal size distribution with two pore diameter peaks as measured by a Barrett-Joyner-Halenda (BJH) pore size distribution from a nitrogen adsorption. The porous anode active material has the pores having a bimodal size distribution, and thus may efficiently remove a stress occurring due to a difference of expansion between a carboneous material and a metallic active material during charging and discharging. Further, the anode electrode and the lithium battery comprising the anode active material have excellent charge/discharge characteristics.
22 Citations
11 Claims
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1. A porous anode active material comprising:
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fine particles of metallic substance capable of forming a lithium alloy; a crystalline carboneous substance; and a porous carboneous material coating and binding the fine particles of metallic substance and the crystalline carboneous substance, the porous anode active material having pores exhibiting a bimodal size distribution with two pore diameter peaks in a Barrett-Joyner-Halenda (BJH) pore size distribution as measured by a nitrogen adsorption test. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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2. A porous anode active material comprising:
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fine particles of metallic substance capable of forming a lithium alloy, a crystalline carboneous substance; and a porous carboneous material coating and binding the fine particles of metallic substance and the crystalline carboneous substance, the porous anode active material having pores exhibiting a bimodal size distribution with two pore diameter peaks in a Barrett-Joyner-Halenda (BJH) pore size distribution as measured by a nitrogen adsorption test, wherein the pores have a first peak in a range of the pore size from 1 nm to less than 10 nm and a second peak in a range of the pore size from greater than 10 nm to 100 nm. - View Dependent Claims (3)
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Specification