JPH0227660A - 非水系二次電池 - Google Patents

非水系二次電池

Info

Publication number
JPH0227660A
JPH0227660A JP63178803A JP17880388A JPH0227660A JP H0227660 A JPH0227660 A JP H0227660A JP 63178803 A JP63178803 A JP 63178803A JP 17880388 A JP17880388 A JP 17880388A JP H0227660 A JPH0227660 A JP H0227660A
Authority
JP
Japan
Prior art keywords
active material
positive electrode
secondary battery
manganese dioxide
mixture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP63178803A
Other languages
English (en)
Other versions
JP2578646B2 (ja
Inventor
Sanehiro Furukawa
古川 修弘
Toshiyuki Noma
俊之 能間
Yuji Yamamoto
祐司 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP63178803A priority Critical patent/JP2578646B2/ja
Publication of JPH0227660A publication Critical patent/JPH0227660A/ja
Application granted granted Critical
Publication of JP2578646B2 publication Critical patent/JP2578646B2/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/36Selection of substances as active materials, active masses, active liquids
    • H01M4/48Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 イ 産業上の利用分野 本発明はリチウム或いはリチウム合金を負極活物質とす
る非水系二次電池艦=係り、特C=正極の改良ζ二関す
るものである。
口 従来の技術 この種二次電池の正極活物質としては三酸化モリブデン
、五酸化バナジウム、チタン或いはニオブの硫化物など
が提案されており、一部実用化されているものもある。
一方、非水系−次電池の正極活物質としては二酸化マン
ガン、フッ化炭素などが代表的なものとして知られてお
り、且これらは既(二実用化されている。
ここで、特に二酸化マンガンは保存性に優れ、資源的1
:豊富であり且安価であるという利点ビ有するものであ
る。
上記せる点1;着目し、二次電池の正極活物質として二
酸化マンガンを用いることが有益であると考えられるが
、二酸化マンガンは可逆性(二難があり充放電サイクル
特性(:問題があつ九。
ハ 発明が解決しようとする課題 本発明は可逆性;二優れたマンガン酸化物を正極活物質
に用いて非水系二次電池の充放電サイクル特性の向上を
図ることを目的とする。
二 課題を解決するための手段 本発明の要旨とするところは、Li2MnCl3を含有
する二酸化マンガンと%L’Y含有しQuKα線1:よ
るx1111回折図C二おいて2θ=22゜315° 
37゜、42°及び55°付近:ニビークを有するマン
ガン酸化物との混合物乞活物質とする正極;二ある。
又、LizMnOs含有二酸化マンガンとQuKa線C
二よるX線回折図において2θ=22゜315° 37
゜、42°及び55°付近にピークを有するLi含有マ
ンガン酸化物との混合物を活物質とする正極と、リチウ
ム或いはリチウム合金を活物質とする負極とを備え九非
水系二次電池C二ある。
ホ作 用 本出願人は112M!1103’2含有する二鍍化マン
ガンを正極活物質二用いること乞提案し九(特願昭61
−258940号参照)。この正極活物質は二酸化マン
ガンとリチウム塩との混合物を500〜430℃の温度
で熱処理して得られるものであり、二酸化マンガン中(
:Llが予じめ侵入しているため、Llの拡散通路が広
がっており二酸化マンガンC二比して可逆性が優れるも
のである。
又、本出願人はLii含有し0uKa線によるX線回折
図::おいて26−22゜、3し5° 6(%願昭63
−60785号参照)。この正極活物質は二酸化マンガ
ンとリチウム塩との混合物を300℃より低い温度で熱
処理して得られるものであり、この場合にも二酸化マン
ガン中(:Llが予じめ侵入しているため、Llの拡散
通路が広がっており二酸化マンガン(;比して可逆性(
;優れるものである。
第1図は二酸化マンガンとリチウム塩との混合物を各種
温度で熱処理した時のX、!1回折図を示す。
二酸化マンガンとリチウム塩との混合物を300℃より
も低温で熱処理したLi含有二酸化マンガンは、600
℃以上で熱処理全行なつ九Li2MtlO3含有二酸化
マンガン1:比して第1表(=示す如く表面積が大きく
、放電初期電圧が高くなるという利点があり、比較的浅
い深度での充放電特性は優れるものの、深い深度での充
放電サイクル、即ち二酸化マンガン粒子の内部まで充放
電反応を利用する場合には結晶内部までLlが侵入して
いないため充放電サイクル特性は劣るものである。
そこで、本発明のよう:=正極活物質としてLi2Mn
O3を含有する二酸化マンガンと、Llを含有しaUK
a線によるX線回折図において2θ=22゜、31,5
゜、57゜、42°及び55゜付近τ;ビークを有する
マンガン酸化物との混合物を用いれば、夫々の利点が生
かされ浅い深度においても深い深度冒二おいても優れ次
光放電サイクル特性が得られる。
第   1   表 へ実施例 以下本発明の実施例(一ついて詳述する。
平均粒子径30μ以下の化学二酸化マンガン80gと水
酸化リチウム20g’に乳鉢にて混合し九後、空気中(
;おいて570℃で20時間熱処理して第1の活物質粉
末を得る〇一方平均粒子径3Uμ以下の化学二酸化マン
ガン80gと水酸化リチウム20g1jr:乳鉢(二で
混合し友後、空気中(−おいて250℃で20時間熱処
理して第2の活物質粉末を得る。
これら第1の活物質、第2の活物質、導電剤としてのア
セチレンブラック及び結着剤としてのフ、素樹脂粉末7
重量比45:45:6:4の比率で混合して正極合剤と
し、この合剤を2トン/−で直径20■(=加圧成型し
たのち250℃で熱処理して正極とする。
負極は所定厚みのリチウム板を直径20m+二打抜い九
ものである。
第2図は上記せる正負極を用いて組立てた扁平形弁水電
解液二次電池の半断面図を示し、(1121はステンレ
ス製の正負極罐であってこれらはポリプロピレン製の絶
縁バッキング(3)(二より隔離されている。(4)は
本発明の要旨とする正極であって、正極罐(1)の内底
面に固着せる正極集電体(5)(二圧接さルている。(
6)は負極であって、負極罐(21の内底面)二固潰せ
る負極集電体f71c圧着されている。(8)はポリプ
ロピレン裂微多孔性薄膜よりなるセパレータであり、プ
ロピレンカーボネートとジメトキシエタンとの混合溶媒
に過塩素酸リチウムを1モル/l溶解しt非水電解液が
含浸されている。電池寸法は直径24.0鴎、厚み5.
0■であった。この本発明電池yt (A)とする。
比較例1 活物質として上記実施例における第1の活物質のみ乞用
い、この第1の活物質と導電剤としてのアセチレンブラ
ック及び結着剤としてのフッ素樹脂粉末とtxf比90
:6:4の比率で混合して正極合剤とすることを除いて
他は上記実施例と同様の比較電池(B1)’&作成した
比較例2 活物質として上記冥施例(:おける第2の活物質のみを
用い、この第2の活物質と導電剤としてのアセチレンブ
ラック及び結着剤としてのフッ素樹脂粉末と7重量比9
0:6:4の比率で混合して正極合剤とすること?除い
て他は上記実施例と同様の比較電池(B2)Y作成し士
第6図及び第4図はこれら電池の充放電サイクル特性図
を示し、第6図は充放電電流3mA、放電時間1時間、
充電終止電圧4.Ovの条件における浅い深度での特性
であり、一方第4図は充放電電流3mA、放電時間12
時間、充電終止電圧4QVの条件における深い深度での
特性である。
第6図より比較的浅い深度の充放電サイクル(二おいて
、本発明電池(A)は比較電池(B1)よりも優れ九サ
イクル特性を示し、且比較電池(B2)と路間等のサイ
クル特性馨示すことがわかる。
又、第4図より比較的深い深度の充放電サイクル(=お
いて、本発明電池(A)は比較電池(B2)よりも優れ
たサイクル特性を示し、且比較電池(B1)と路間等の
サイクル特性を示すことがわかる。
これら第3図及びWc4図から本発明電池(A)は浅い
深度(二おいても深い深度においても優れた充放電サイ
クル特性7有する電池であると云える。
尚、本発明の実施例で示したように、第1及びg2の活
物質?、二酸化マンガンとリチウム塩との混合物を熱処
理して得る場合C二はリチウム塩としては実施例で示し
次水酸化リチウム(二限定されず、炭酸リチウムや硝酸
リチウムも適用することができ、又二酸化マンガンとリ
チウム塩との混合比率は90:10〜30ニア0の範囲
が好ましい。
ト 発明の効果 上述し念如く、非水系二次電池において、正極活物質と
してLi2Mn0iSF<含有する二酸化マンガンと、
Lid含有しCuKαglI”−よるX線回折図+:お
いて2θ=22031,50,37042°及び55°
付近(−ピークを有するマンガン酸化物との混合物を用
いることによυ、浅い深度及び深い深度のいずれC:お
いても充放電サイクル特性(=優れ九非水系二次電池を
得ることができるものであシ、その工業的価値は極めて
大である。
尚、本発明電池は実施例で示し次非水電解液二次電池に
限定されず固体電解質二次電池(ユも適用することがで
きる。
【図面の簡単な説明】
第1図は二酸化マンガンと水酸化リチウムとの混合物を
各種温度で熱処理した時のX線回折図、第2図は本発明
電池の半断面図、第3図及び第4図は充放電サイクル特
性図であって、第6図は浅い深度、第4図は深い深度の
場合!夫々示す。 (1)・・・正極罐、(2)・・・負極罐、(3)・・
・絶縁バッキング、(4)・・・正極、(6)・・・負
極、(8)・・・セパレータ。

Claims (2)

    【特許請求の範囲】
  1. (1)Li_2MnO_3を含有する二酸化マンガンと
    、Liを含有しCuKα線によるX線回折図において2
    θ=22゜、31.5゜、37゜、42゜及び55゜付
    近にピークを有するマンガン酸化物との混合物を活物質
    とすることを特徴とする非水系二次電池の正極。
  2. (2)Li_2MnO_3含有二酸化マンガンとCuK
    α線によるX線回折図において2θ=22゜、31.5
    ゜、37゜、42゜及び55゜付近にピークを有するL
    i含有マンガン酸化物との混合物を活物質とする正極と
    、リチウム或いはリチウム合金を活物質とする負極とを
    備えた非水系二次電池。
JP63178803A 1988-07-18 1988-07-18 非水系二次電池 Expired - Fee Related JP2578646B2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63178803A JP2578646B2 (ja) 1988-07-18 1988-07-18 非水系二次電池

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63178803A JP2578646B2 (ja) 1988-07-18 1988-07-18 非水系二次電池

Publications (2)

Publication Number Publication Date
JPH0227660A true JPH0227660A (ja) 1990-01-30
JP2578646B2 JP2578646B2 (ja) 1997-02-05

Family

ID=16054925

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2578646B2 (ja)

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