JP2005166325A - Secondary battery and its manufacturing method - Google Patents
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- JP2005166325A JP2005166325A JP2003400949A JP2003400949A JP2005166325A JP 2005166325 A JP2005166325 A JP 2005166325A JP 2003400949 A JP2003400949 A JP 2003400949A JP 2003400949 A JP2003400949 A JP 2003400949A JP 2005166325 A JP2005166325 A JP 2005166325A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 55
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 15
- 239000010439 graphite Substances 0.000 claims abstract description 15
- 230000002441 reversible effect Effects 0.000 claims abstract description 11
- 239000011148 porous material Substances 0.000 claims description 43
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 28
- 239000000377 silicon dioxide Substances 0.000 claims description 14
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 10
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 10
- 229910052744 lithium Inorganic materials 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 6
- 230000002687 intercalation Effects 0.000 claims description 5
- 238000009830 intercalation Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 13
- 230000002427 irreversible effect Effects 0.000 abstract description 10
- 239000007772 electrode material Substances 0.000 abstract description 3
- 239000013081 microcrystal Substances 0.000 abstract description 3
- 239000003575 carbonaceous material Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000002041 carbon nanotube Substances 0.000 description 5
- 229910021393 carbon nanotube Inorganic materials 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- 239000002048 multi walled nanotube Substances 0.000 description 3
- 239000002109 single walled nanotube Substances 0.000 description 3
- 238000001988 small-angle X-ray diffraction Methods 0.000 description 3
- 238000004736 wide-angle X-ray diffraction Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000007600 charging Methods 0.000 description 2
- 238000002484 cyclic voltammetry Methods 0.000 description 2
- 238000009831 deintercalation Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 240000006829 Ficus sundaica Species 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000013354 porous framework Substances 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
Description
本発明は、充電型電池、特にリチウム電池の負極として用いるカーボン系電極材料を備えた二次電池に関する。 The present invention relates to a rechargeable battery, particularly a secondary battery provided with a carbon-based electrode material used as a negative electrode of a lithium battery.
現在、世界で１０兆円規模のリチウム電池、特に充電型（２次）リチウム電池の負極として、カーボン系が良く使われている。
従来型のカーボン系負極、特にグラファイト（黒鉛）型のカーボン系負極の容量は３７２ｍＡｈ／ｇ（Ｌｉ１Ｃ６）であり、さらに高容量のカーボン系負極が要求されている。
電池の性能をアップするためには、粒子或いは細孔の微細化及び高比表面積化が要求されるが、カーボン系材料も例外ではない。しかしながら、今日まで提案されている色々な負極用カーボン系材料は、安定な高容量までには至っていないのが、現状である。
Currently, carbon-based materials are often used as negative electrodes for lithium batteries with a scale of 10 trillion yen, particularly rechargeable (secondary) lithium batteries.
The capacity of a conventional carbon-based negative electrode, particularly a graphite (graphite) -type carbon-based negative electrode, is 372 mAh / g (Li 1 C 6 ), and a higher capacity carbon-based negative electrode is required.
In order to improve the performance of the battery, it is required to make particles or pores finer and increase the specific surface area, but carbon materials are no exception. However, various carbon materials for negative electrodes that have been proposed to date have not yet reached a stable high capacity.
最近、高容量のカーボン系材料を用いたリチウム電池用として、多層（multi-walled : MWNTs）カーボンナノチューブ又は単層（single-walled : SWNTs）カーボンナノチューブが注目されている。
しかし、いずれも高非可逆容量Ｃｉｒｒ（４６０−１０８０ｍＡｈ／ｇ）及び相対的に低可逆容量Ｃｒｅ（１００−４００ｍＡｈ／ｇ）が観察された。また従来型のカーボン系材料と同様に、初期インターカレーション及びデインターカレーションプロセスの間に大きなヒステリシスが見られた。
Recently, multi-walled (MWNTs) carbon nanotubes or single-walled (SWNTs) carbon nanotubes have attracted attention as lithium batteries using high-capacity carbon-based materials.
However, both high irreversible capacity C irr (460-1080mAh / g) and a relatively low reversible capacity C re (100-400mAh / g) was observed. Also, similar to conventional carbon-based materials, large hysteresis was observed during the initial intercalation and deintercalation processes.
このようなことから、高可逆容量と優れたサイクル特性を有するカーボン系材料の合成が望まれている。
カーボン系材料の中に、メソポーラスカーボンが挙げられる。この規則配列した空孔を持つメソポーラスカーボンは、Ｒｙｏｏ等により１９９９年に報告されたものである（非特許文献１参照）。
このメソポーラスカーボンは多くの注目を集め、水素貯蔵材料、吸着剤、触媒の担体又は電気化学２層キャパシタ（ＥＤＬＣｓ）としての用途が提案された。
しかし、このメソポーラスカーボンは最初の放電（還元）過程において、３１００ｍＡｈ／ｇ程度の異常に大きい容量を示すが、最初の可逆（酸化）過程において、可逆容量Ｃｒｅは１１００ｍＡｈ／ｇ程度になり、大きな容量ロスが発生する。
この非可逆容量Ｃｉｒｒは約２０００ｍＡｈ／ｇであり、その比（Ｃｒｅ／Ｃｒｅ＋Ｃｉｒｒ）は３４％程度である。
Among the carbon-based materials, mesoporous carbon is exemplified. This mesoporous carbon having regularly arranged vacancies was reported by Ryoo et al. In 1999 (see Non-Patent Document 1).
This mesoporous carbon has received much attention and has been proposed for use as hydrogen storage materials, adsorbents, catalyst supports or electrochemical double layer capacitors (EDLCs).
However, in this mesoporous carbon initial discharge (reduction) process, it exhibits unusually large capacity of about 3100mAh / g, in the first reversible (oxidation) process, reversible capacity C re becomes approximately 1100mAh / g, a large Capacity loss occurs.
The irreversible capacity C irr is about 2000mAh / g, the ratio (C re / C re + C irr) is about 34%.
本発明で解決しようとする課題は、（１）ポーラス構造のフレームワークの中に黒鉛カーボンの微結晶を有する三次元構造を持つメソポーラスカーボンを製造すること、（２）その製造プロセスを簡単化すること、（３）初期充・放電サイクルにおいて一定の不可逆容量によりロスが有っても、数サイクル後には高い容量(ＬｉｘＣ６： ｘ＝２．０〜４．０)を維持していること、（４）初期充・放電サイクルを除いて、高い可逆率（Ｒ＞９０％）を維持していること、を備えたカーボン系電極材料を備えた二次電池の開発である。 The problems to be solved by the present invention are as follows: (1) producing mesoporous carbon having a three-dimensional structure having graphite carbon microcrystals in a porous framework; and (2) simplifying the production process. (3) Even if there is a loss due to a certain irreversible capacity in the initial charge / discharge cycle, a high capacity (Li x C 6 : x = 2.0 to 4.0) is maintained after several cycles. (4) Development of a secondary battery provided with a carbon-based electrode material having a high reversibility rate (R> 90%) except for the initial charge / discharge cycle.
本発明は、上記メソポーラスカーボンの特性を活かし、二次電池への適用が可能であることの知見を得た。
本発明は、この知見にもとづいて、
１）３次元的に均一な細孔が規則的に配列したメソポーラスカーボンからなる電極で構成されていることを特徴とする二次電池、２）細孔の平均直径が２ｎｍ〜６ｎｍであることを特徴とする１記載の二次電池、３）六方体又は立方体構造を持つメソポーラスカーボンのフレームワークの中に、数ナノオーダーのグラファイト（黒鉛）の微細結晶を備えていることを特徴とする１又は２記載の二次電池、４）フレームワークの壁の厚さが２〜９ｎｍであることを特徴とする１〜３のいずれかに記載の二次電池、５）表面積が６００〜１２００ｍ２／ｇであることを特徴とする１〜４のいずれかに記載の二次電池、６）細孔の体積が０．７〜１．２ｃｍ３／ｇであることを特徴とする１〜５のいずれかに記載の二次電池、７） ４〜６サイクルの初期充・放電サイクル後に、高可逆容量（ＬｉｘＣ６: ｘ＝２．０〜４．０）を有していることを特徴とする１〜６のいずれかに記載の二次電池、８）最初のインタカーレショウンにおいて、高い充・放電容量（ＬｉｘＣ６:ｘ＝６．０〜１０）を有することを特徴とする１〜７のいずれかに記載の二次電池、９）５〜６サイクルの初期充・放電サイクル除き、高可逆率 (ｒ＞９０％)を有していることを特徴とする１〜８のいずれかに記載の二次電池、１０）リチウム二次電池であることを特徴とする１〜９のいずれかに記載の二次電池を提供する。
The present invention has obtained the knowledge that it can be applied to a secondary battery by taking advantage of the characteristics of the mesoporous carbon.
Based on this finding, the present invention
1) A secondary battery characterized in that it is composed of electrodes made of mesoporous carbon in which three-dimensionally uniform pores are regularly arranged. 2) The average diameter of the pores is 2 nm to 6 nm. The secondary battery according to 1 characterized in that 3) a mesoporous carbon framework having a hexagonal or cubic structure is provided with fine crystals of graphite (graphite) on the order of
また、本発明は、１１）３次元的なシリカなどのメソポーラス酸化物をテンプレートとして、砂糖などの有機物質をメソポーラスシリカの細孔に充填し、不活性雰囲気で炭化させ、その後フッ酸でメソポーラスシリカを除去することを特徴とするメソポーラスカーボンからなる電極で構成された二次電池の製造方法、１２）３次元的なシリカなどのメソポーラス酸化物をテンプレートとして、砂糖などの有機物質をメソポーラスシリカの細孔に充填し、不活性雰囲気で炭化させ、その後フッ酸でメソポーラスシリカを除去することを特徴とする１〜１０のいずれかに記載のメソポーラスカーボンからなる電極で構成された二次電池の製造方法を提供する。 Further, the present invention relates to 11) Mesoporous oxides such as three-dimensional silica as templates, and organic substances such as sugar are filled in pores of mesoporous silica, carbonized in an inert atmosphere, and then mesoporous silica with hydrofluoric acid. 12) A method for manufacturing a secondary battery composed of an electrode made of mesoporous carbon, characterized in that the organic substance such as sugar is used as a template for a mesoporous oxide such as three-dimensional silica. A method for producing a secondary battery comprising an electrode made of mesoporous carbon according to any one of 1 to 10, wherein the pore is filled, carbonized in an inert atmosphere, and then mesoporous silica is removed with hydrofluoric acid I will provide a.
本発明の三次元構造を有する３次元的に細孔のサイズと構造が制御されたメソポーラスカーボンの製造方法は、極めて簡便な方法であるばかりでなく、ポーラス細孔のサイズと構造を制御することが可能であり、表面積が大きく、規則正しく整列した六方晶（ヘキサゴナル）又は立方晶（キュービック）構造を備えた３次元的に細孔のサイズと構造が制御された二次電池用負極材料としてのメソポーラスカーボンを得ることができる。
また、これによって５〜６サイクルの初期充・放電サイクル除き、高可逆率 (ｒ＞９０％)を有し、容量が大きく、充放電サイクル特性に優れた二次電池を得ることができる。
The method for producing mesoporous carbon having a three-dimensional structure and controlled pore size and structure according to the present invention is not only a very simple method, but also controls the size and structure of the porous pores. As a negative electrode material for a secondary battery with a large surface area and a regularly arranged hexagonal or cubic structure with a controlled three-dimensional pore size and structure Carbon can be obtained.
In addition, a secondary battery having a high reversibility (r> 90%), a large capacity, and excellent charge / discharge cycle characteristics can be obtained except for 5 to 6 initial charge / discharge cycles.
以下に本発明の具体例を示すが、本発明はこれらの具体例になんら拘束されるものではない。
本発明の３次元的に均一な細孔（ポア）が規則的に配列したメソポーラスカーボン（ＣＭＫ−３）からなる電極は、８５０〜１１００ｍＡｈ／ｇの高可逆容量を有している。
細孔の平均直径は２ｎｍ〜６ｎｍであり、六方体又は立方体構造を持つメソポーラスカーボンのフレームワークの中に、数ナノオーダー（２〜５ｎｍ）のグラファイト（黒鉛）の微細結晶を有する。
図１に、本発明のメソポーラスカーボンの小角Ｘ線回折（ＸＲＤ）パターンと広角Ｘ線回折パターンを示す。
小角Ｘ線回折（ＸＲＤ）パターンでは、六方晶構造の（１００）、（１１０）及び（２００）の回折ピークが見られる。
Specific examples of the present invention are shown below, but the present invention is not limited to these specific examples.
The electrode made of mesoporous carbon (CMK-3) regularly arranged with three-dimensionally uniform pores (pores) of the present invention has a high reversible capacity of 850 to 1100 mAh / g.
The average diameter of the pores is 2 nm to 6 nm, and it has fine crystals of graphite (graphite) on the order of several nanometers (2 to 5 nm) in the framework of a mesoporous carbon having a hexagonal or cubic structure.
FIG. 1 shows a small-angle X-ray diffraction (XRD) pattern and a wide-angle X-ray diffraction pattern of the mesoporous carbon of the present invention.
In the small-angle X-ray diffraction (XRD) pattern, diffraction peaks of (100), (110) and (200) having a hexagonal crystal structure are observed.
また、広角Ｘ線回折パターンでは、グラファイト構造の（００２）と（１００）の２個のブロードな回折ピークが見られる。このようなブロードな回折ピークは、大きく積層したグラファイト結晶相が殆ど含まれていないことを示している。
（００２）のｄ−スペースは約０．３６ｎｍであり、これは純グラファイトカーボン（約０．３３ｎｍ）のそれよりやや大きい。
図２に、本発明の３次元的に均一な細孔（ポア）が規則的に配列したメソポーラスカーボン（ＣＭＫ−３）の透過型電子顕微鏡で観察した結果を示す。約４ｎｍの均一な細孔（ポア）を有する整列した六方体構造を有するメソポーラスカーボンが確認できる。
In the wide-angle X-ray diffraction pattern, two broad diffraction peaks of (002) and (100) having a graphite structure are observed. Such a broad diffraction peak indicates that the graphite crystal phase that is largely laminated is hardly contained.
The (002) d-space is about 0.36 nm, which is slightly larger than that of pure graphite carbon (about 0.33 nm).
FIG. 2 shows the result of observation of the mesoporous carbon (CMK-3) in which the three-dimensionally uniform pores (pores) of the present invention are regularly arranged with a transmission electron microscope. A mesoporous carbon having an aligned hexagonal structure having uniform pores (pores) of about 4 nm can be confirmed.
六方体構造を有するメソポーラスカーボンの一例を示すと、六方メソ構造の単位長さが約１０．５ｎｍであり、細孔の直径が３．９ｎｍである。
したがって、フレームワークの壁の厚さは１０．５−３．９＝６．６ｎｍである。そして、Brunauer-Emmett-Teller (BET)表面積は、約１０３０ｍ２／ｇであり、トータルの細孔（ポア）の体積が０．８７ｃｍ３／ｇである３次元的に均一な細孔が規則的に配列したメソポーラスカーボンを得ることができる。
An example of a mesoporous carbon having a hexagonal structure has a unit length of about 10.5 nm and a pore diameter of 3.9 nm.
Thus, the wall thickness of the framework is 10.5-3.9 = 6.6 nm. The Brunauer-Emmett-Teller (BET) surface area is about 1030 m 2 / g, and the volume of the total pores (pores) is 0.87 cm 3 / g. Can be obtained.
本発明の３次元的に規則的に配列した均一な細孔（ポア）を有するメソポーラスカーボン（ＣＭＫ−３）の０．０１Ｖ〜１．５Ｖ（ｖｓ．Ｌｉ／Ｌｉ＋）の電位におけるサイクリックボルタンメトリーを図３に示す。スキャン速度は０．１ｍＶ／ｓである。
また、３次元的に規則的に配列した均一な細孔（ポア）を有するメソポーラスカーボン（ＣＭＫ−３）の定電流充・放電特性を図４に示す。電流は１００ｍＡ／ｇである。定電流充放電することにより、リチウムのインターカレーション容量を測定することが出来る。
最初の放電（還元）プロセスでは、約３１００ｍＡｈ／ｇの異常に大きき容量を示す。ＬｉｘＣ６: ｘ＝８．４であり非常に高い。しかし、この最初のプロセスにおける可逆容量（酸化）、すなわちＣｒｅは１１００ｍＡｈ／ｇ（ＬｉｘＣ６：ｘ＝３．０）だけである。
Cyclic voltammetry of mesoporous carbon (CMK-3) having uniform pores (pores) arranged three-dimensionally regularly according to the present invention at a potential of 0.01 V to 1.5 V (vs. Li / Li + ). Is shown in FIG. The scan speed is 0.1 mV / s.
FIG. 4 shows constant current charge / discharge characteristics of mesoporous carbon (CMK-3) having uniform pores (pores) regularly arranged three-dimensionally. The current is 100 mA / g. Lithium intercalation capacity can be measured by charging and discharging at constant current.
The first discharge (reduction) process shows an unusually large capacity of about 3100 mAh / g. Li x C 6 : x = 8.4, which is very high. However, the reversible capacity in the first process (oxidation), i.e. C re is 1100mAh / g (Li x C 6 : x = 3.0) is only.
この容量の大きなロスは不可逆容量Ｃｉｒｒと呼ばれ、約２０００ｍＡｈ／ｇである。その比（Ｃｒｅ／Ｃｒｅ＋Ｃｉｒｒ）は約３４％である。
この不可逆容量Ｃｉｒｒは、本発明のメソポーラスカーボンＣＭＫ−３の表面（［Ｈ］、［Ｏ］サイト、など）、固体電解質界面（ＳＥＩ）、ＬｉｘＣ６のコロージョン的反応に依存する。そして、充・放電プロセスのヒステリシスは大きい。これは、５００〜７００°Ｃの低温で製造された高容量カーボン系材料の共通の現象であり、カーボン系材料に含まれるヒステリシスの量は水素に比例する。
This large loss of capacity is called irreversible capacity Cirr and is about 2000 mAh / g. The ratio (C re / C re + C irr) is about 34%.
This irreversible capacity Cirr depends on the corrosive reaction of the surface ([H], [O] site, etc.), solid electrolyte interface (SEI), and Li x C 6 of the mesoporous carbon CMK-3 of the present invention. And the hysteresis of charging / discharging process is large. This is a phenomenon common to high-capacity carbon-based materials manufactured at a low temperature of 500 to 700 ° C., and the amount of hysteresis contained in the carbon-based material is proportional to hydrogen.
図５に、３次元的に細孔のサイズと構造が制御されたメソポーラスカーボンのサイクル特性を示す。３、５回目以降では、放電容量（リチウムのインターカレーション）と充電容量（リチウムのデインターカレーション）は、ほぼ８５０〜１１００ｍＡｈ／ｇ(ＬｉｘＣ６＝２．３〜３．０)前後であり、安定している。
２サイクル目で、（Ｃｒｅ／Ｃｒｅ＋Ｃｉｒｒ）は８３％に増加し、４サイクル目及び５サイクル目ではそれぞれ９０％〜９３％に達する。
FIG. 5 shows the cycle characteristics of mesoporous carbon whose pore size and structure are controlled three-dimensionally. In the third and subsequent times, the discharge capacity (lithium intercalation) and the charge capacity (lithium deintercalation) are approximately 850 to 1100 mAh / g (Li x C 6 = 2.3 to 3.0). And is stable.
In the second cycle, (C re / C re + C irr) is increased to 83%, respectively reach 90% to 93% in the fourth cycle and the fifth cycle.
表１に、本発明のメソポーラスカーボンＣＭＫ−３と対比して、従来の材料、すなわちＰＶＣ７００（poly vinyl chloride at 700°C）、ＯＸＹ（Oxychem phenolic regin at 700°C）、ＭＷＮＴ（多層ナノチューブ）９００、ＳＷＮＴ（単層ナノチューブ）の表面積、充・放電の際の可逆容量Ｃｒｅ、非可逆容量Ｃｉｒｒ、５サイクル後の平均ロスχ等を示す。
表１に示すように、本発明のメソポーラスカーボンＣＭＫ−３は、５サイクル後には（Ｃｒｅ／Ｃｒｅ＋Ｃｉｒｒ）は９４％に増加し、また平均ロスχは少なく、いずれの従来の材料に比べても優れた特性を示す。
Table 1 shows conventional materials such as PVC 700 (polyvinyl chloride at 700 ° C.), OXY (Oxychem phenolic regin at 700 ° C.), and MWNT (multi-walled nanotube) 900 in comparison with the mesoporous carbon CMK-3 of the present invention. , SWNT (single-walled nanotube) surface area, reversible capacity C re during charge / discharge, irreversible capacity C irr , average loss χ after 5 cycles, and the like.
As shown in Table 1, the mesoporous carbon CMK-3 of the present invention, after 5 cycles (C re / C re + C irr) is increased to 94%, the average loss χ is small, in any of the conventional materials Compared to excellent characteristics.
一般に、高容量の非グラファイト系カーボンは、サイクル数が増加しても高非可逆容量を示す。このような非グラファイト系カーボンと本発明の規則的な配列を有するメソポーラスカーボンＣＭＫ−３との差異は、細孔の平均直径が２ｎｍ〜６ｎｍ（３．９ｎｍ）であること、及び表面積が６００〜１２００ｍ２／ｇ（１０３０ｍ２／ｇ）に達することである。
メソポーラスカーボンＣＭＫ−３は、カーボンナノチューブと類似した細孔（ポア）を有する。しかし、メソポーラスカーボンＣＭＫ−３の細孔（ポア）三次元的に規則配列し、均一性に富むという極めて特異な構造を有している。他方、カーボンナノチューブはランダムな三次元の細孔（ポア）構造を有する。
In general, a high capacity non-graphite carbon exhibits a high irreversible capacity even when the number of cycles increases. The difference between such non-graphitic carbon and mesoporous carbon CMK-3 having the regular arrangement of the present invention is that the average diameter of the pores is 2 nm to 6 nm (3.9 nm), and the surface area is 600 to Reaching 1200 m 2 / g (1030 m 2 / g).
Mesoporous carbon CMK-3 has pores (pores) similar to carbon nanotubes. However, the pores of the mesoporous carbon CMK-3 are regularly arranged three-dimensionally and have a very unique structure that is rich in uniformity. On the other hand, carbon nanotubes have a random three-dimensional pore structure.
メソポーラスカーボンＣＭＫ−３の可逆容量が大きくなる機構というのは必ずしも明確ではない。しかし、本発明のメソポーラスカーボンＣＭＫ−３の充放電容量とサイクル特性は、カーボンナノチューブよりも優れていることが明らかとなった。
初期段階、特に第１回目の充放電サイクルにおける容量の大きなロス、すなわち不可逆容量Ｃｉｒｒ約２０００ｍＡｈ／ｇは、もはや問題とならない。数サイクル後に充放電容量が安定することが極めて重要な要素であり、二次電池として有効である。
The mechanism by which the reversible capacity of mesoporous carbon CMK-3 increases is not always clear. However, it was revealed that the charge / discharge capacity and cycle characteristics of the mesoporous carbon CMK-3 of the present invention are superior to those of the carbon nanotubes.
The large loss of capacity in the initial stage, particularly in the first charge / discharge cycle, that is, the irreversible capacity Cirr of about 2000 mAh / g is no longer a problem. Stabilization of charge / discharge capacity after several cycles is an extremely important factor and is effective as a secondary battery.
本発明の規則的に配列されたメソポーラスカーボンは、３次元的なシリカなどのメソポーラス酸化物をテンプレートとして、砂糖などの有機物質をメソポーラスシリカの細孔に充填し、これを不活性雰囲気で炭化させ、その後フッ酸でメソポーラスシリカを除去することによってポーラス構造のフレームワークの中に黒鉛カーボンの微結晶を有する三次元構造を持つメソポーラスカーボン製造することができる。
この製造プロセスは、極めて簡単であり、コスト低減に貢献する。さらに、この製造工程によって、初期充・放電サイクルにおいて一定の不可逆容量によりロスが有っても、数サイクル後には高い容量(ＬｉｘＣ６： ｘ＝２．０〜４．０)を維持させることができ、さらに初期充・放電サイクルを除いて、高い可逆率
（Ｒ＞９０％）を維持することができる。
The regularly arranged mesoporous carbon of the present invention uses mesoporous oxide such as three-dimensional silica as a template, fills the pores of mesoporous silica with an organic substance such as sugar, and carbonizes this in an inert atmosphere. Then, by removing the mesoporous silica with hydrofluoric acid, it is possible to produce mesoporous carbon having a three-dimensional structure having fine graphite carbon crystals in the framework of the porous structure.
This manufacturing process is extremely simple and contributes to cost reduction. Further, this manufacturing process maintains a high capacity (Li x C 6 : x = 2.0 to 4.0) after several cycles even if there is a loss due to a certain irreversible capacity in the initial charge / discharge cycle. In addition, a high reversibility rate (R> 90%) can be maintained except for the initial charge / discharge cycle.
本発明の三次元構造を有する３次元的に細孔のサイズと構造が制御されたメソポーラスカーボンの製造方法は、極めて簡便であるばかりでなく、ポーラス細孔のサイズと構造を制御することが可能であり、表面積が大きく、規則正しく整列した六方晶（ヘキサゴナル）又は立方晶（キュービック）構造を備えた、３次元的に細孔のサイズと構造が制御された二次電池用負極材料としてのメソポーラスカーボンを得ることができる。
これによって、５〜６サイクルの初期充・放電サイクル除き、高可逆率 (ｒ＞９０％)を有している容量が大きく、充放電サイクル特性に優れた二次電池を得ることができる。特に、リチウム二次電池に有効である。
The method for producing mesoporous carbon having three-dimensional pore size and structure controlled according to the present invention is not only very simple, but also allows control of the size and structure of the porous pores. A mesoporous carbon as a negative electrode material for a secondary battery having a large surface area and regularly arranged hexagonal or cubic structure with controlled pore size and structure Can be obtained.
As a result, a secondary battery having a high capacity with a high reversibility (r> 90%) and excellent charge / discharge cycle characteristics can be obtained except for the initial charge / discharge cycles of 5 to 6 cycles. In particular, it is effective for lithium secondary batteries.
Claims (12)
A mesoporous oxide such as three-dimensional silica is used as a template, an organic substance such as sugar is filled in the pores of mesoporous silica, carbonized in an inert atmosphere, and then the mesoporous silica is removed with hydrofluoric acid. The manufacturing method of the secondary battery comprised with the electrode which consists of mesoporous carbon in any one of Claims 1-10.
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